Looking for thermopile laser power sensor.

[c4r0]

WTB: Thermopile laser power sensor.

Hello everyone!
I'd like to buy a used thermopile laser power sensor for powers up to a few watts. It may have some burns on the sensitive area, I just want it to be usable and the cheaper it is the better. Something like that Coherent sensor from the Kenometer would be perfect. I live in Poland but now I'm in Goleta (CA) for three weeks (I'm leaving on July 25th), so to that date shipping may be to Goleta. I'm interested in something below $150

 

[dr-ebert]

Most people seem to get them from ebay - look for "scientech".

 

[c4r0]

I'm checking ebay for some time but there is nothing interesting for me. People sell on ebay only meters that are new or in good condition, its too expensive for me. I've seen some big scientech cylinders with 'banana' sockets on the back some time ago and it was quite cheap - has anyone here used something like this? What is it actually and is it suitable for measuring low powers like several miliwatts?

 

[Eku]

how much power do you want to measure up to?

 

[HIMNL9]

Those cheap sensors you've seen, if are the same i've seen (one look as a heatsink, and another like a big tube with a hole in a side), was some old 200 / 250W heads ..... doubt that they can measure less than 1 watt

 

[lasersbee]

If you only want to measure a few milliwatts and the lasers you want to measure are
in the range of 500nm to 1050nm... look at this....

Calibrated Laser Power Meter Sensor Module by J.BAUER Electronics (EBAYHLPM)


Jerry

 

[john_lawson]

he said watts jerry lol

 

[HIMNL9]

^ putting in front of the diode a ND filter OD 4 ? ..... (j/k )

 

[lasersbee]

he said watts jerry lol

I read "less than 1mW...

Never mind....


Jerry

 

[c4r0]

If you only want to measure a few milliwatts and the lasers you want to measure are
in the range of 500nm to 1050nm... look at this....

Calibrated Laser Power Meter Sensor Module by J.BAUER Electronics (EBAYHLPM)


Jerry

Actually I made something like this (see the attached pics). It works pretty well but only to about 5mW and you need to know the wavelength of the light and also it can't measure light that contains a few wavelengths (like the light from green DPSSL). I also bought a ND4 filter (25% transmition) and I broke it to four parts so I could put four togethet to get even 256x attenuation. But accurcy of this is really bad, I got about 40% inaccuracy with measuring 240mW 650nm laser. That's why I'm looking for a thermopile, to be able to measure wide range of powers without attenuating filter and don't worry about the wavelength.