Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Experiments & Modifications



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 06-04-2009, 04:33 PM #49
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,432
Rep Power: 17201
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: 7,432
Rep Power: 17201
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

It has been a while, but i've been doing some work on it again. I've slightly modified the sensor design, greatly reducing problems with convection and airflows, and also improving the response times a little.

See the picture for the prototype, and sensor diagram.

The new version sits on a 0.6mm copper support wire, that also serves as the main heat transfer sink. Component wires are thinner, but also draw away some heat obviously. The resistor was changed to a smd type, which reduces thermal mass, and gets enough heatsinking to do to the 250 mW calibration as its mounted.

The support wire and components are fixed to the plate using a very thin layer of cyanoacrylate glue. For the isolation i've used some bubble wrap for the prototype - a styrofoam cut-out would work better.

Thanks to Warske for sending me some materials. I've also tried the really thin foil, which is cool stuff: it improves speed quite dramatically, but is so thin it doesnt spread the heat evenly... using that material, you get different readings if you hit the sensor plate in different areas.
Attached Thumbnails
DIY: Laser Power Gauge-laser-newsensor.jpg  


Benm is online now   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 06-18-2009, 01:22 PM #50
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,432
Rep Power: 17201
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: 7,432
Rep Power: 17201
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

Some shots of the new sensor at work.
Attached Thumbnails
DIY: Laser Power Gauge-laser-newsensor-50mw-cr2.jpg   DIY: Laser Power Gauge-laser-newsensor-dilda.jpg   DIY: Laser Power Gauge-laser-blueray.jpg  
Benm is online now   Reply With Quote
Old 06-18-2009, 01:39 PM #51
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,709
Rep Power: 40441
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,709
Rep Power: 40441
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default

Hey Benm...

nice work... any schematic or parts update for your finished LPM...


Jerry

You can contact us at any time on our Website: J.BAUER Electronics
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner

Last edited by lasersbee; 07-01-2012 at 11:55 AM.
lasersbee is offline   Reply With Quote
Old 06-18-2009, 02:35 PM #52
k1kb0t's Avatar
Class 2 Laser
 
Join Date: May 2009
Location: Tampa, FL
Posts: 458
Rep Power: 11
k1kb0t will become famous soon enoughk1kb0t will become famous soon enough
k1kb0t k1kb0t is offline
Class 2 Laser
k1kb0t's Avatar
 
Join Date: May 2009
Location: Tampa, FL
Posts: 458
Rep Power: 11
k1kb0t will become famous soon enoughk1kb0t will become famous soon enough
Default

Nice job BenM, I like seeing all these DIY projects.

Jon
__________________
"Words when put into one form or another may unlock some ideal form. They need not, one cannot make another see he can only provide the stimulation that's helps the other to see for himself."
- Plato, The Republic

405nm - Jayrob 4171 PHR w/ 405-G1 lens mod
660nm - Jayrob 4171 LPC w/ Meredith lens mod

Transmissions - blog.kikbot.org
k1kb0t is offline   Reply With Quote
Old 06-18-2009, 05:04 PM #53
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,432
Rep Power: 17201
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: 7,432
Rep Power: 17201
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

Quote:
Originally Posted by lasersbee View Post
Hey Benm...

nice work... any schematic or parts update for your finished LPM...
Thanks... nice thing is: the schematic is exactly the same as in the first post, the changes are purely mechanical. The reference diode is solderd onto a little circuit board that serves as mechanical support on one of the sides.

The whole trick to this meter is the mechanial buildup... the electronics are nothing more than an adjustable difference amplifier with offset, and a voltage regulator for the heating/calibration.
Benm is online now   Reply With Quote
Old 07-13-2009, 04:56 PM #54
HIMNL9's Avatar
Class 4 Laser
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
HIMNL9 HIMNL9 is offline
Class 4 Laser
HIMNL9's Avatar
 
Join Date: May 2009
Location: Lost somewhere in the EU mess ;)
Posts: 5,416
Rep Power: 404
HIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond reputeHIMNL9 has a reputation beyond repute
Lightbulb Re: DIY: Laser Power Gauge

Hi Benm ..... seen this post, and have a thing to suggest you.

Not all the peoples knows, but also if in a little way, 1N4148 in glass cases are influenced also from external light (you can see also in your mount, probably, just hitting on and off a bright light or a low power laser directly on your reference diode).

I know well this, cause sometimes i use them as temperature probes, and had a lot of problems, times ago, when i was trying to get a stable readout from them with an high impedance amp section ..... they was in an ambient where the light changes during the days, and i had always some little, but unexplicable, fluctuations, also just moving around the sensors, that was thinking initially that they acts as antennas for the EMI / RFI around ..... then i remembered that when i was young, and photodiodes and phototransistors was costing a lot, i was making my own ones decapping old diodes and transistors, so i just painted the ones i used as sensors with matte black paint (the one that is used for paint motorcycles exhaust discharge tubes), and all stabilized a lot more (and, from that time, i always paint them, when i use them as sensors ).

so, maybe you can take away some fluctuations and errors, just painting the back of your sensor assembly with black paint ..... and another thing, as usual in electronic, for "omogeneize" the tolerance of single components and increase the response of your sensor, put 4 diodes in series, glued rear your sensor, and 4 in series also for the reference (and don't forget to paint black also the ones that you use as references, ofcourse )

Just some ideas .....
__________________
High Impulse Multipath Neutron Laser (mark 9 ) (LOL)
Dare mo mita koto no nai, kaze, kumo, suna, umi ..... Kokoro no hate no doko ka eien ga kagayaku.
HIMNL9 is offline   Reply With Quote
Old 07-14-2009, 08:31 AM #55
dr-ebert's Avatar
Class 2M Laser
 
Join Date: Mar 2009
Posts: 713
Rep Power: 32
dr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond repute
dr-ebert dr-ebert is offline
Class 2M Laser
dr-ebert's Avatar
 
Join Date: Mar 2009
Posts: 713
Rep Power: 32
dr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond reputedr-ebert has a reputation beyond repute
Default Re: DIY: Laser Power Gauge

Quote:
Originally Posted by Benm View Post
I am a bit puzzled why the results are too high, i expected them to be too low due to light not being absorbed and all. Somehow the laser seems to do a better job at heating the sensor than the resistor does... perhaps a matter of mechanical design.
I think that's because the way you've mounted it, the resistor will for a good part be heating air instead of your target. Maybe enclose the backside in a tiny cardboard box, to prevent air currents around the resistor?

EDIT: Gah - didn't see how old this thread is. But DIY LPMs get me excited
__________________
1. Quoting in forums should cost money. There are too many people who blindly quote the immediately preceding post, including already-quoted quotes.
2. Someone who tells others to "use the Search button" without providing a set of reasonably obvious search terms that actually returns the proper answer within the first results page should get banned for a week.

Last edited by dr-ebert; 07-14-2009 at 08:39 AM.
dr-ebert is offline   Reply With Quote
Old 07-14-2009, 02:45 PM #56
Benm's Avatar
Class 4 Laser
 
Join Date: Aug 2007
Location: Netherlands
Posts: 7,432
Rep Power: 17201
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: 7,432
Rep Power: 17201
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: DIY: Laser Power Gauge

Doesnt matter its old, its a project i tinker on once in a while and then leave it be for weeks or more.

Painting the diodes black (or using plastic cased ones) might do some good - i know they are have light sensitive properties, though thats usually applied when they are reverse-biased... i should check if it makes any difference during forward bias operation as in this sensor design.

Mounthing 4 in series would increase the signal, but also the thermal mass of the sensor. It should boost de S/N ratio twofold, but there doesnt seem to be any noise problem, once set the thing is stable.

Quote:
Maybe enclose the backside in a tiny cardboard box, to prevent air currents around the resistor?
I actually did something like that in the second design - to restrict airflow around the sensor plate. The idea is to get conduction to be the chief mechanism that takes heat away from the plate. Convection should be avoided as it is very variable and not linear with temperature difference.
Benm 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


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f42/diy-laser-power-gauge-26332.html
Posted By For Type Date
> circuits > diy laser power gauge l29270 - Next.gr This thread Refback 08-27-2014 04:22 PM
Electronic Circuits Page 552 :: Next.gr This thread Refback 08-25-2014 10:02 PM
Laser pointers and modules This thread Refback 01-20-2013 09:48 AM










Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 11:10 AM.


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