Old 08-09-2018, 04:55 PM #1
Junior Member
 
Join Date: Jul 2018
Location: Finland
Posts: 2
Rep Power: 0
jjsym is on a distinguished road
jjsym jjsym is online now
Junior Member
 
Join Date: Jul 2018
Location: Finland
Posts: 2
Rep Power: 0
jjsym is on a distinguished road
Smile Laser glow in the dark clock

Hello to all laser pros out there. Im working on a project where I will use glow in the dark material and blue/uv laser to draw current time on the material every minute. It will work as a night clock during dark hours at the bedroom.

Idea is that Ill stick the glow material to a wall where I want the clock and then have the drawing module at different wall doing the drawing across the room with laser. Software compensates the geometry so it can draw from weird angles too.

It seemd simple project to do but Ive run into a few issues.

I have glow in the dark material, laser, servos etc working quite OK.

Biggest problem is the noise of servos. As many of you know, as I move the laser with servos to create the number figure it makes noise... and thats bad in a quiet bedroom. Here is where Im asking for your ideas.

What are some silent ways of modifying the laser beam direction accurately? What methods are even available?
I know there are these filters that make figures on the wall.. can I make those myself for every number and rotate them? How do they work?

All ideas are welcome, thanks!



Last edited by jjsym; 08-09-2018 at 04:56 PM.
jjsym is online now   Reply With Quote


















Old 08-09-2018, 08:39 PM #2
paul1598419's Avatar
Class 4 Laser
 
Join Date: Sep 2013
Location: Washington State
Posts: 12,501
Rep Power: 21474891
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
paul1598419 paul1598419 is online now
Class 4 Laser
paul1598419's Avatar
 
Join Date: Sep 2013
Location: Washington State
Posts: 12,501
Rep Power: 21474891
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
Default Re: Laser glow in the dark clock

Why do you need a laser to have a clock you can see in the dark? I have a cheap digital CD player/alarm clock that does this quite well and very quietly too. Some things were never meant to be done with lasers. I think this is one of those.
__________________
405nm Laser Pointer 45mW
405nm C11 700mW
405nm Laser Shack Pointer 80mW
Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

473nm 50 mW BWB-10-OEM DPSS
477nm 127 mW 501B
488nm 135 mW EDC Sharp diode
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
493nm 120 mW 501B
502nm 110 mW 501B Lifetime
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
574nm OptLaser DPSS Laser 36 mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
638nm 1 watt Cyprus II
635nm 100mW pointer
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
Ocean Optics USB2000 Spectrometer
B&W TEK BTC100 Spectrometers X3
Scientech Vector S310 with AC2500 10 Watt LPM/ Hyperion 6 Watt & 20 Watt LPM/ Radiant X4 3.7 Watt LPM
paul1598419 is online now   Reply With Quote
Old 08-09-2018, 11:47 PM #3
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,462
Rep Power: 7374626
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,462
Rep Power: 7374626
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Laser glow in the dark clock

Oh give it a rest, Paul. MOST of the shit done on this forum has no real purpose. Why would you want a multiwatt handheld laser? For many of the same reasons you might want to build something like this clock. It's quirky, it looks cool, it's a challenge, it furthers your knowledge of electronics, it "sounds badass", and it's fun. Let other people enjoy things.

It's one thing to say "I am looking for the best way to tell the time in the dark", but clearly this isn't OP's goal, as even the most fierce of idiots would be aware of radio alarm clocks.

Mr. sym, look into laser show galvos (short for galvanometers). These are relatively quiet at full speed, but are practically silent if driven slowly. They're not all that cheap, but they're fun devices to experiment with, and you can rebuild your device into a laser show projector when you get tired of the clock.
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 08-09-2018 at 11:47 PM.
Cyparagon is online now   Reply With Quote
Old 08-09-2018, 11:57 PM #4
Class 2 Laser
 
Join Date: Nov 2017
Location: California, USA
Posts: 478
Rep Power: 15913735
Gazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond repute
Gazen Gazen is online now
Class 2 Laser
 
Join Date: Nov 2017
Location: California, USA
Posts: 478
Rep Power: 15913735
Gazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond reputeGazen has a reputation beyond repute
Default Re: Laser glow in the dark clock

As already stated, this is an impractical project, but then again, most projects on this forum are. As Cyparagon said, a galvo could work, which utilizes mirrors to guide the beam.

Your best bet for the laser is 405. There are no uv diodes atm at a reasonable price. Unless you get lucky and find one on the surplus market, their cost will be in the thousands. Keep in mind duty cycle or you may wake up with a dead diode.

Good luck on your project
__________________
405nm 200 mW (Sanwu Pocket)
445nm 1 W (Sanwu Challenger I)
465nm 1.4W (PL-E Mini)
490nm 55mW GH04850B2G (C6)
532nm Unmetered (eBay)
589nm 30mW (DL Spartan)
593.5nm 1.575mW Avg/3.499mW pk (Laserglow/CNI GLP)
650nm 250mw (Sanwu Pocket)

Optics Kit from Optotronics

Last edited by Gazen; 08-09-2018 at 11:58 PM.
Gazen is online now   Reply With Quote
Old 08-10-2018, 01:06 AM #5
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,923
Rep Power: 11983856
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,923
Rep Power: 11983856
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Laser glow in the dark clock

Well yeah, the galvo's drawing the clock face would produce noise, there is no way around that really.

But perhaps there is another solution to it: You have these alarm clocks that project the time onto the ceiling or wall, usually using a red LED as the source of light. Under daylight conditions this is hardly visible at all, but at night it's quite pleasant: legible if you look at it, but not bright enough to distrub your sleep.

You could replace the red LED in such a device with a 400nm-ish one (or blu-ray laser diode without a focussing lens) and then paint the target area with fluorescent paint. I'm not sure what the result would look like, but it seems feasible to try.

These things usually display the time in numbers like 12:34 rather than a clock face, but it would be a start
Benm is online now   Reply With Quote
Old 08-10-2018, 05:06 AM #6
ArcticDude's Avatar
Super Moderator
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
ArcticDude ArcticDude is offline
Super Moderator
ArcticDude's Avatar
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
Default Re: Laser glow in the dark clock

ArcticDude is offline   Reply With Quote
Old 08-10-2018, 07:38 AM #7
Super Moderator
 
Join Date: Jan 2014
Location: Dohaha, Qatar
Posts: 11,412
Rep Power: 21474886
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Alaskan Alaskan is offline
Super Moderator
 
Join Date: Jan 2014
Location: Dohaha, Qatar
Posts: 11,412
Rep Power: 21474886
Alaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond reputeAlaskan has a reputation beyond repute
Default Re: Laser glow in the dark clock

This idea would probably be too expensive, but you could use seven laser diodes, each having a cylinder lens in front of them to create small lines, then digitally turn each laser diode on and off, they would project digits just like a regular LED clock, but I expect using LED's that way focused on the wall would be a better way to go, I've seen them advertised before.

Edit: You would probably need to mask the output of each cylinder lens into clean rectangles to make the lines sharp enough, and to keep overlap from occurring.
__________________

Attention new brothers of the collimated light!

Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions: - https://laserpointerforums.com/f37


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be ~very~ roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

YAG Power Calc. Laser Peak Power Calculator - Ophir

Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

RHD's Relative Brightness vs Wavelength Calc: https://tinyurl.com/RHD-brightness

High Current Pulse Diode Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 08-10-2018 at 07:45 AM.
Alaskan is offline   Reply With Quote
Old 08-10-2018, 09:07 PM #8
ArcticDude's Avatar
Super Moderator
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
ArcticDude ArcticDude is offline
Super Moderator
ArcticDude's Avatar
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
Default Re: Laser glow in the dark clock

MEMS Laser Scan mirrors could be suitable solution for this kind of project,
you can find MEMS Evaluation Kits for developers, but I don't know the price tag.

MEMS scan mirrors are pretty much noiseless..













Products | Opus Microsystems

https://www.preciseley.com/mems-scanning-mirror.html


EDIT

..Ot just find old laser pico-projector and swap blue laser diode to 405nm diode

j/k


Last edited by ArcticDude; 08-10-2018 at 09:18 PM.
ArcticDude is offline   Reply With Quote
Old 08-10-2018, 09:16 PM #9
Junior Member
 
Join Date: Jul 2018
Location: Finland
Posts: 2
Rep Power: 0
jjsym is on a distinguished road
jjsym jjsym is online now
Junior Member
 
Join Date: Jul 2018
Location: Finland
Posts: 2
Rep Power: 0
jjsym is on a distinguished road
Default Re: Laser glow in the dark clock

Galvos seem like a solution that might work. Atleast the principle behind them seem way more silent than servos. Anyone have experience how silent are they?
For sure they make some noise but if I fill the drawing unit with acoustic material and only have a small hole for light to make it out it might be enough...
Could also have a glass to even further work as sound proofing.

Galvos seem great for other future projects too and theres some going for ~70€ on ebay.
I'll try one of those and see how it goes.

Thanks!

Edit: That MEMS thing seems awesome, but probably way overkill as it's meant for LiDAR and other high precision technologies.. found one listing on ebay:
https://www.ebay.com/itm/5mm-MEMS-Fa...k/323320970058

"List price at manufacturer, Mirrorcle Technologies is: $936.00
Offered at 70% DISCOUNT due to overstock.

Note: SOLD IN PACKS OF 2
Buy now for only $649.00"

Last edited by jjsym; 08-10-2018 at 09:23 PM.
jjsym is online now   Reply With Quote
Old 08-10-2018, 10:09 PM #10
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,462
Rep Power: 7374626
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,462
Rep Power: 7374626
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Laser glow in the dark clock

Quote:
Originally Posted by jjsym View Post
Anyone have experience how silent are they?
In regular (projector) use, there's a slight buzz/hum/tone that changes depending on the projected image. Most/all the noise is created from the moving mirrors acting as teeny speakers. However, if you slow the drive signal way down, they are silent. There's no need to retrace GITD material at tens of hertz for persistence of vision, since the GITD material itself provides the persistence.
__________________
A problem well stated is a problem half solved.

Last edited by Cyparagon; 08-10-2018 at 10:11 PM. Reason: additional detail
Cyparagon is online now   Reply With Quote
Old 08-10-2018, 11:01 PM #11
ArcticDude's Avatar
Super Moderator
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
ArcticDude ArcticDude is offline
Super Moderator
ArcticDude's Avatar
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
Default Re: Laser glow in the dark clock

SensLite 2D MEMS Scanning Module 405nm >>
ArcticDude is offline   Reply With Quote
Old 08-10-2018, 11:20 PM #12
paul1598419's Avatar
Class 4 Laser
 
Join Date: Sep 2013
Location: Washington State
Posts: 12,501
Rep Power: 21474891
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
paul1598419 paul1598419 is online now
Class 4 Laser
paul1598419's Avatar
 
Join Date: Sep 2013
Location: Washington State
Posts: 12,501
Rep Power: 21474891
paul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond reputepaul1598419 has a reputation beyond repute
Default Re: Laser glow in the dark clock

These 2D MEMS scanning modules are very cutting edge, but they are priced like it too. I imagine these could be used to scan all sorts of 2D things, but there has to be a cheaper option for people who don't have an unlimited budget.
__________________
405nm Laser Pointer 45mW
405nm C11 700mW
405nm Laser Shack Pointer 80mW
Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

473nm 50 mW BWB-10-OEM DPSS
477nm 127 mW 501B
488nm 135 mW EDC Sharp diode
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
493nm 120 mW 501B
502nm 110 mW 501B Lifetime
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
574nm OptLaser DPSS Laser 36 mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
638nm 1 watt Cyprus II
635nm 100mW pointer
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
Ocean Optics USB2000 Spectrometer
B&W TEK BTC100 Spectrometers X3
Scientech Vector S310 with AC2500 10 Watt LPM/ Hyperion 6 Watt & 20 Watt LPM/ Radiant X4 3.7 Watt LPM

Last edited by paul1598419; 08-11-2018 at 01:18 AM.
paul1598419 is online now   Reply With Quote
Old 08-11-2018, 12:28 AM #13
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,923
Rep Power: 11983856
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Benm Benm is online now
Class 4 Laser
Benm's Avatar
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,923
Rep Power: 11983856
Benm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond reputeBenm has a reputation beyond repute
Default Re: Laser glow in the dark clock

Quote:
Originally Posted by Cyparagon View Post
In regular (projector) use, there's a slight buzz/hum/tone that changes depending on the projected image. Most/all the noise is created from the moving mirrors acting as teeny speakers. However, if you slow the drive signal way down, they are silent. There's no need to retrace GITD material at tens of hertz for persistence of vision, since the GITD material itself provides the persistence.
That's a fair point - i'm used to galvo's running at fairly high speeds (at least 20.000 pps) but there would be no need to move fast with the GITD paint.

It would be mostly a matter of getting sofware to drive the galvo's that slowly as most controllers are designed to run at projector speeds, and also keep the mirrors in position as best as they can, compensating for overshoot and things like that.

There would be no reason they could not handle slowly changing signals though, producing far less noise. You could essentially slow them down to a crawl or 50 pps or so and just draw in the clock lines without making any hard/fast turns which usually cause a lot of noise.

Compare how loud is it is to draw an unoptimized 'starfield' simulation versus just a circle with a regular scanner.
Benm is online now   Reply With Quote
Old 08-11-2018, 03:24 AM #14
kecked's Avatar
Class 1M Laser
 
Join Date: Jun 2012
Posts: 207
Rep Power: 7756902
kecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond repute
kecked kecked is online now
Class 1M Laser
kecked's Avatar
 
Join Date: Jun 2012
Posts: 207
Rep Power: 7756902
kecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond reputekecked has a reputation beyond repute
Default Re: Laser glow in the dark clock

LCD gobo

The 405 glows a very bright blue when it hits the green phos. It will wake you up. I gurrenttee it.
The scanner will make noise as well. Yes you could turn the laser down in brightness.

You could also make the 8segments out of a diode laser and cyl lens to spread it out. Now you just drive the laser like the regular digits. No scanner needed. Use cheap 660nm diodes as you would need 30 diodes. Less if you are clever and use shutters.
__________________
1mhz-440mhz-ham radio
2.54/5.6ghz -router
10ghz-pin diode
30ghz-pin diode
2thz-canít tell you....
10600-gas
1113-diode
1064 dpss
976-diode
875-diode
808-diode

671-dpss
660-diode
650-diode
642-diode
638-diode
632-hene

510-diode
515-diode
520-diode
532-dpss
565-dpss
575-dpss
505-diode
495-diode
473-dpss
470-diode
465-diode
462-diode
455-diode
450-diode
445-diode

405-diode
266-dpss q switched 25 up
195-hg lamp

Ocean Optics HR2000. 200nm-1100nm
Ocean Optics LLS-1
Oceanview full
BW TEK-2000nm/800nm/400nm moved gratings
Beckmann Du-25/30
Raman 473/532/660/785nm
Zeiss Confocal Microscope fitted with Raman 785nm
kecked is online now   Reply With Quote
Old 08-11-2018, 07:13 AM #15
ArcticDude's Avatar
Super Moderator
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
ArcticDude ArcticDude is offline
Super Moderator
ArcticDude's Avatar
 
Join Date: Jun 2016
Location: Fennoscandia
Posts: 2,071
Rep Power: 21474847
ArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond reputeArcticDude has a reputation beyond repute
Default Re: Laser glow in the dark clock





DIY Night Clock Projector >>

Changing light source to 405nm LD could probably work as well..

Last edited by ArcticDude; 08-11-2018 at 01:14 PM.
ArcticDude is offline   Reply With Quote
Old 08-13-2018, 10:03 PM #16
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,462
Rep Power: 7374626
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,462
Rep Power: 7374626
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Laser glow in the dark clock

Quote:
Originally Posted by Benm View Post
sofware ... also keep the mirrors in position as best as they can, compensating for overshoot and things like that.
No. The stability is done with hardware on the amp board via trimpots. I've personally aligned/calibrated scanners before. A delicate balance between gain, low frequency damping, and high frequency damping determines the "overshoot and things like that". If the amp board is aligned properly, the mirror position is linearly proportional to the input voltage. No "software" required. Any bog-standard signal generator will suffice.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 05:59 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC