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 01-27-2008, 11:55 PM #65
Class 2M Laser
 
Join Date: Aug 2007
Posts: 725
Rep Power: 66
LarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond repute
LarryQ LarryQ is offline
Class 2M Laser
 
Join Date: Aug 2007
Posts: 725
Rep Power: 66
LarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond repute
Default Re: DIY Laser Power Meter

Ken..I was only trying to find the proper meter for my project....

You told me straight out that the meter you used required a dedicated voltage source...and after looking around noticed that some meters needed a dedicated or Isolated source..while others did not..

I was not trying to cast dobt on your meter as a whole...but rather I am searching to discover now which meters would require a seperate voltage source, and which meters could use the power already there...

I've seen the $4.45 meters on ebay that Asia Engineer (giorgio11185) sells.....I believe that these are great meters..and appear identical to the meter that you use....

I also agree that a meter that can share the power source is a much more elegant solution......
Since you are also looking to go this way..I see that you also believe that there is a better solution available.

If you find a good meter solution...let me know!!!
You have been very good at finding items of interest......
I can only imagine what other projects you are working on.

LarryQ


LarryQ is offline   Reply With Quote







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







Old 01-29-2008, 03:16 AM #66
Kenom's Avatar
Class 4 Laser
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Kenom Kenom is offline
Class 4 Laser
Kenom's Avatar
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Default Re: DIY Laser Power Meter

the meter you've indicated from asia engineer is precisely the meter I got, and it's not suitable as it needs isolated power from the read.

I wasn't raggin on ya! LOL I know that your only trying to solve this portion and I'm trying to do the same thing. I've actually run into a nice meter that's pretty small and I'll have the link at the bottom of this post.

I don't want people to think I am against this project. I'm not. I'm upset that it's eating up all the boards I could be makin meters off of but heck that's really no thing in the big picture. I'm glad that folks can utilize these to get a good meter. Although with this method calibration is a factor. If you don't have a meter to test the readings and set from a baseline it's hard to do. if not impossible. needless to say, I'll probably be using this to make one for myself and see how it performs compared to the modifications I'm doing to the boards.

One thing for sure I'm going to use and hopefully knimrod will sell them to me premade is those pc interface boards.
Link below.



http://cgi.ebay.com/ws/eBayISAPI.dll...:IT&ih=022
Kenom is offline   Reply With Quote
Old 01-29-2008, 04:22 AM #67
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: DIY Laser Power Meter

Quote:
Originally Posted by Kenom
I'm glad that folks can utilize these to get a good meter. *Although with this method calibration is a factor. *If you don't have a meter to test the readings and set from a baseline it's hard to do. if not impossible. *needless to say, I'll probably be using this to make one for myself and see how it performs compared to the modifications I'm doing to the boards.

Oh no.. *Calibration is not really a factor with the DIY meter presented here. *That's the beauty of this project. *It's the Coherent sensor head that's already calibrated at 1uV per mW. *All we have to do is make an amp that scales up the voltage accurately. *Our amp has a precise gain of 1000 which gets us our 1mV per mW for reading with a multimeter or DPM. *
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 01-29-2008, 11:01 PM #68
Class 1M Laser
 
Join Date: Aug 2007
Posts: 241
Rep Power: 11
Zarniwoop is on a distinguished road
Zarniwoop Zarniwoop is offline
Class 1M Laser
 
Join Date: Aug 2007
Posts: 241
Rep Power: 11
Zarniwoop is on a distinguished road
Default Re: DIY Laser Power Meter

>
Grr - Looks like my sensor head is dead.
Built the circuit - no output change when I point various lasers at it.
Made a 120uV voltage divider and hooked it in place of the sensor, and I see the 120mV output.
Oh well. I guess they did say "as is".
(I noticed the fuse was blown on the board - I wonder if that's related.)
Zarniwoop is offline   Reply With Quote
Old 01-29-2008, 11:04 PM #69
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: DIY Laser Power Meter

The PC Boards have arrived.

It's great fun cutting them apart and if you ordered more than one board, you get to cut them apart yourself. : :
Attached Thumbnails
DIY Laser Power Meter-dscf0795.jpg  
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 01-29-2008, 11:05 PM #70
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: DIY Laser Power Meter

Close up view:
Attached Thumbnails
DIY Laser Power Meter-dscf0797.jpg  
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 01-29-2008, 11:06 PM #71
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: DIY Laser Power Meter

Assembled PC Board. I'll be testing this later tonight.
Attached Thumbnails
DIY Laser Power Meter-dscf0798.jpg  
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 01-30-2008, 12:02 AM #72
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: DIY Laser Power Meter

Initial testing complete. *It works perfectly. *8-)

Because the sensor head is factory calibrated to output 1uV per mW, we can presume that having an accurate amplifier gain of 1000 will yield our desired amplifier output voltage of exactly 1mV per mW.

I preset my gain pot to 6.3K and powered it up. *The power measurements track perfectly with my prototype meter and also with my Coherent 210 thermal power meter. *The only calibration I did was measure my feedback resistors and calculate the preset value for the gain potentiometer.

The amplifier's gain is determined by the resistors in the feedback loop of the op-amp. *Gain in this case is (R2+R3+R4+VR1)/R2 *[(100+47K+47K+5.9K)/100=1000].

I have suggested a pre-set value of 5.9K for the gain potentiometer, VR1, assuming that all the resistors in the amplifier will be accurate to their indicated values. *The reality is that since we are using resistors with a 5% tolerance rating, it stands to reason that the accuracy could be affected by up to 5% (or more) if using the suggested VR1 pre-set value of 5.9K. *We want our DIY meter to be as accurate as we can get so we should calibrate it. *We can either compare the laser power measurement to a known standard and adjust the gain pot accordingly or, we can calibrate the gain of the amplifier. *We can do this by carefully measuring the resistors that set the amplifier's gain (R2, R3, R4) and then calculate the correct pre-set resistance for VR1 to give us our gain of 1000. * Here is the formula: VR1=(R2*1000)-(R3+R4)-R2. * *

My resistor measurements were as follows:
R2=99.1
R3=46.4K
R4=46.3K

So the calculation was: (99.1*1000)-(46400+46300)-99.1 = 6300.9 (or 6.3K)

All that said, if you use the 5% resistors and just pre-set VR1 to 5.9K, chances are you will be very close to an accurate calibration.
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 01-30-2008, 12:26 AM #73
roSSco's Avatar
Class 2M Laser
 
Join Date: Dec 2007
Posts: 649
Rep Power: 14
roSSco is a jewel in the roughroSSco is a jewel in the roughroSSco is a jewel in the rough
roSSco roSSco is offline
Class 2M Laser
roSSco's Avatar
 
Join Date: Dec 2007
Posts: 649
Rep Power: 14
roSSco is a jewel in the roughroSSco is a jewel in the roughroSSco is a jewel in the rough
Default Re: DIY Laser Power Meter

That's some great news! Those boards look awesome.
roSSco is offline   Reply With Quote
Old 01-30-2008, 01:18 AM #74
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,031
Rep Power: 16
turtlecannon has a spectacular aura aboutturtlecannon has a spectacular aura about
turtlecannon turtlecannon is offline
Class 3R Laser
 
Join Date: Jun 2007
Posts: 1,031
Rep Power: 16
turtlecannon has a spectacular aura aboutturtlecannon has a spectacular aura about
Default Re: DIY Laser Power Meter

Those boards look great! I hope there's enough interest for that second buy.
turtlecannon is offline   Reply With Quote
Old 01-30-2008, 01:31 PM #75
Kenom's Avatar
Class 4 Laser
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Kenom Kenom is offline
Class 4 Laser
Kenom's Avatar
 
Join Date: May 2007
Posts: 5,629
Rep Power: 304
Kenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond reputeKenom has a reputation beyond repute
Send a message via MSN to Kenom
Default Re: DIY Laser Power Meter

Quote:
Originally Posted by Zarniwoop
>
Grr - Looks like my sensor head is dead.
Built the circuit - no output change when I point various lasers at it.
Made a 120uV voltage divider and hooked it in place of the sensor, and I see the 120mV output.
Oh well. *I guess they did say "as is".
(I noticed the fuse was blown on the board - I wonder if that's related.)
That sucks that your head is doa! I'm going to have to check each one and make sure they are all good now!
Kenom is offline   Reply With Quote
Old 01-30-2008, 02:20 PM #76
Class 2M Laser
 
Join Date: Aug 2007
Posts: 725
Rep Power: 66
LarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond repute
LarryQ LarryQ is offline
Class 2M Laser
 
Join Date: Aug 2007
Posts: 725
Rep Power: 66
LarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond reputeLarryQ has a reputation beyond repute
Default Re: DIY Laser Power Meter

OK!!!

I started to layout my project box today.

I have to say that for a while I did not think this box was going to have enough face area for what I wanted to do...

But it all fit!!

Like it was designed for this layout!!!

I decided to place a Green LED Pilot light on the face of the meter...I think it is going to look really great powered up!!!

Here is a Photo....and sry about the quality...I am no photographer!!!



Can't wait for the boards to get here!!

LarryQ

Here is a Picture!
LarryQ is offline   Reply With Quote
Old 01-30-2008, 03:54 PM #77
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: DIY Laser Power Meter

All PCBs from the first group buy were sent today via USPS first class mail. The post office tells me 1-3 days for delivery.
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 01-30-2008, 03:55 PM #78
knimrod's Avatar
Class 2 Laser
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
knimrod knimrod is offline
Class 2 Laser
knimrod's Avatar
 
Join Date: Nov 2007
Location: Lansing, MI
Posts: 384
Rep Power: 13
knimrod is a jewel in the roughknimrod is a jewel in the roughknimrod is a jewel in the rough
Default Re: DIY Laser Power Meter

Quote:
Originally Posted by LarryQ
OK!!!

I started to layout my project box today.

I have to say that for a while I did not think this box was going to have enough face area for what I wanted to do...

But it all fit!!

Like it was designed for this layout!!!

I decided to place a Green LED Pilot light on the face of the meter...I think it is going to look really great powered up!!!

Here is a Photo....and sry about the quality...I am no photographer!!!



Can't wait for the boards to get here!!

LarryQ

Here is a Picture!
That looks great! Nice work! What enclosure is that and what panel meter?
__________________
I never give them hell. I just tell the truth and they think it's hell. - Harry S. Truman
knimrod is offline   Reply With Quote
Old 01-30-2008, 04:01 PM #79
roSSco's Avatar
Class 2M Laser
 
Join Date: Dec 2007
Posts: 649
Rep Power: 14
roSSco is a jewel in the roughroSSco is a jewel in the roughroSSco is a jewel in the rough
roSSco roSSco is offline
Class 2M Laser
roSSco's Avatar
 
Join Date: Dec 2007
Posts: 649
Rep Power: 14
roSSco is a jewel in the roughroSSco is a jewel in the roughroSSco is a jewel in the rough
Default Re: DIY Laser Power Meter

Quote:
Originally Posted by knimrod
All PCBs from the first group buy were sent today via USPS first class mail. *The post office tells me 1-3 days for delivery.
Sweet!
roSSco is offline   Reply With Quote
Old 01-30-2008, 05:35 PM #80
Dark_Horse's Avatar
Class 2M Laser
 
Join Date: Dec 2007
Location: Pacific NW, USA
Posts: 698
Rep Power: 25
Dark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud of
Dark_Horse Dark_Horse is offline
Class 2M Laser
Dark_Horse's Avatar
 
Join Date: Dec 2007
Location: Pacific NW, USA
Posts: 698
Rep Power: 25
Dark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud ofDark_Horse has much to be proud of
Default Re: DIY Laser Power Meter

Knimrod,
Great job on the boards, thank you ;D
Quote:
That looks great! *Nice work! *What enclosure is that and what panel meter? *
Back to top * *
*
I am very interested in this info as well.

__________________
Dark_Horse is offline   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-meter-26831.html
Posted By For Type Date
Laser Power Meter Diy images This thread Refback 05-21-2017 10:25 PM
Diy Laser Pointer : CRAFTS This thread Refback 09-01-2015 03:25 AM
?????-???????? : Laser power meter This thread Refback 05-12-2013 04:48 PM
- 798 - Hobbi TV This thread Refback 02-13-2013 09:01 AM
Electronics Forum -> Laser Optical Output Meter This thread Refback 09-27-2012 09:37 PM
DIY Thermal Meter - How to ... x This thread Refback 07-21-2012 12:19 PM










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 06:35 PM.


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