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Need help in designing a laser power meter using a thermopile sensor

Samueltrasound

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Dec 17, 2020
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Hey Guys!

I am Samuel John, a Ph.D. candidate, constructing a laser power meter for my continuous-wave laser (1470 nm, 10W). I have a thermopile sensor (photos attached). The specs of the thermopile sensor ( Lumenis Coherent 0210-796-00) is 200W Diameter, 41mm. I would love any suggestions on how to use this sensor

I tried using Arduino and a thermocouple amplifier (MAX 31856), but I see a negative temperature range when the laser beam strikes the sensor. Im confused.

I will be grateful to you if you can help with this query

Thanks
Samuel John
 

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AsteroidsOnSteroids

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Mar 4, 2020
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Do you have a datasheet or manual for that sensor? If not, it might be worth contacting the manufacturer directly to ask for one. I have no experience with thermopiles, but I know that with thermocouples if you reverse the polarity of the wires then the measured temperature will be going in the wrong direction (i.e. a hot thing will measure cold, or vice versa). Maybe the same kind of thing is happening here. Try reversing the leads of the sensor (and to be clear, I have no experience with thermopiles and I have no experience with this sensor specifically, only do that if you are sure it won't screw anything up).

If that doesn't do it, then you have to start looking at your whole setup. Is the thermopile faulty, is the amplifier circuit wrong, is the arduino code misinterpreting things, etc...
 

Lifetime17

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Dec 15, 2014
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Hi,
Get in touch with Jerry from this company. many folks here use him and he is on spot and can answer your questions.
Rich:)
 




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