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Old 03-15-2011, 07:14 PM #17
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Default Re: Gentec PS-310WB Thermopile

Jerry - so Scientech doesn't use radial thermopiles in their units? Do you have a picture of one? I'd be curious to see what they look like.
EDIT - Nvm, found some online.

Laserbee TECs are just as custom designed as the ones used by Radiant Electronics


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Old 03-15-2011, 07:18 PM #18
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Default Re: Gentec PS-310WB Thermopile

Quote:
Originally Posted by MarioMaster View Post
Laserbee TECs are just as custom designed as the ones used by Radiant Electronics
Just to clarify... the TECs that Radiant uses are mass produced and
anyone can buy them.
Ours are manufactured to our specs and are only available to
J.BAUER Electronics... That's why we need to pay a premium
price for our Wafer Thermopiles...


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Old 03-15-2011, 07:24 PM #19
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Default Re: Gentec PS-310WB Thermopile

Quote:
Originally Posted by lasersbee View Post
Just to clarify... the TECs that Radiant uses are mass produced and
anyone can buy them.
Ours are manufactured to our specs and are only available to
J.BAUER Electronics... That's why we need to pay a premium
price for our Wafer Thermopiles...


Jerry
Because Jerry sure knows where I source my components from

The "wafer themopiles" used in the Radiant Alpha can only be found at Radiant Electronics.




Edit - it's all just marketing. Both meters are based upon the same technology. Both provide fairly accurate readings for hobbyists who can't afford to go buy a Coherent power meter for $2000
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Old 03-15-2011, 07:27 PM #20
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Default Re: Gentec PS-310WB Thermopile

I must be mistaken Mario....
I'm not as TEC knowledgeable as you I guess...

http://ca.mouser.com/Thermal-Managem...+15x15&FS=True

Digikey Part Number 102-1666 or 102-1679 or any number of 15mm X15mm X (3.5 to 4mm)
TECs... just to name 2 large suppliers...


Jerry

Last edited by lasersbee; 03-15-2011 at 08:07 PM. Reason: Added links
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Old 03-18-2011, 10:20 PM #21
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Default Re: Gentec PS-310WB Thermopile

Got the thermopile today. The sensor surface seems to be in great shape. No burns or pits. As for the sensor itself, it is very interesting ... the round surface seems to be a gray ceramic disc mounted to a TEC that has a high junction count. The heater coil is mounted on the TEC around the sensor disc. All of this is mounted to a solid chucnk of aluminum. This thing is not small. Diameter is 3" and length is 3.5".



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Old 03-18-2011, 10:34 PM #22
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Default Re: Gentec PS-310WB Thermopile

Interesting design, very different than that of the Ophir thermopiles. All you gotta do now is trace the two wires coming off the junctions to the plug and feed that to your amplifier.

The read time on that thing has gotta be painfully slow. (without the meter's built in estimation system)
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Old 03-18-2011, 10:38 PM #23
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Default Re: Gentec PS-310WB Thermopile

I posted the manual with the pinout, no need to trace wires. If the response is predicable an differentiating amplifier will shorten the rise time A LOT. It's probably what all power meters do.
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Old 03-18-2011, 10:40 PM #24
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Default Re: Gentec PS-310WB Thermopile

Quote:
Originally Posted by Bluefan View Post
I posted the manual with the pinout, no need to trace wires. If the response is predicable an differentiating amplifier will shorten the rise time A LOT. It's probably what all power meters do.
Only some, mostly the Scientech units. The Ophir piles are so thin they react extremely quickly on their own.
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Old 03-18-2011, 11:33 PM #25
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Default Re: Gentec PS-310WB Thermopile

I have a 10A head of ophir, but it's direct output response is slow. The ophir OEM heads have an intergrated amplifier, and I think those already have a differentiating circuit to speed up the response.
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Old 03-19-2011, 08:10 AM #26
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Default Re: Gentec PS-310WB Thermopile

Yeah, 254-junctions TEC plate is sure not a commercial ebay design, LOL ..... yes, these units uses a disk of dark ceramic (not painted, usually is its own color) ..... ceramic surface is porous, and this help in catch light .....

This particular design is intended for mid-time readings, usually over 30 seconds to 1 minute exposition, but is very efficent ..... just take care in never touch the gray disk with the fingers, the oily part in the skin fingerprints can be easily adsorbed from the ceramic disk and alter the reflection/absorption index, changing the calibration (it does not ruin the disk, but it change the reading, and get it clean again requires high grade acetone and is a little pain you-know-where )
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Old 03-20-2011, 07:10 AM #27
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Default Re: Gentec PS-310WB Thermopile

I made a small video of this head with my Arduino LPM. This is raw input, no zeroing or amplification. The "zero" reading starts at 162mV, my 1.3W(estimated) 445 settles around 191mV yielding a delta of 29mV.
Ill have to wait for my new amp PCB to show up before I can do a proper test.

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Edit: This version of the video on vimeo seems to have better quality: http://vimeo.com/21251165
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Old 03-20-2011, 11:10 AM #28
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Default Re: Gentec PS-310WB Thermopile

Quote:
Originally Posted by jib77 View Post
I made a small video of this head with my Arduino LPM. This is raw input, no zeroing or amplification. The "zero" reading starts at 162mV, my 1.3W(estimated) 445 settles around 191mV yielding a delta of 29mV.
Ill have to wait for my new amp PCB to show up before I can do a proper test.

LPM | Flickr - Photo Sharing!

Edit: This version of the video on vimeo seems to have better quality: Gentec LPM on Vimeo
Nice work...
Don't forget that the Arduino only has a 10bit ADC...

Jerry
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Old 03-20-2011, 12:45 PM #29
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Default Re: Gentec PS-310WB Thermopile

^ then why not use an external ADC ?

Just as example

Just another example

Another one
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Old 03-20-2011, 01:15 PM #30
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Default Re: Gentec PS-310WB Thermopile

This looks Great. Keep up the Great work.

+ For You.
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Old 03-20-2011, 01:51 PM #31
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Default Re: Gentec PS-310WB Thermopile

Quote:
Originally Posted by HIMNL9 View Post
^ then why not use an external ADC ?
That was my point....
Unless 10 bits will do what he wants...


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Last edited by lasersbee; 03-20-2011 at 01:53 PM.
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Old 03-20-2011, 02:24 PM #32
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Default Re: Gentec PS-310WB Thermopile

Building an amplifier to compensate the offset and to have the correct gain would be the first step. Considering the sensitivity of the head you can go for multiple ranges or a higher resolution ADC as mentioned.
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