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Should I buy this LPM for 62$ USD?

Joe Mo

Joe Mo

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Been talking to the guys at bluefan.nl to buy an LPM. I did some emailing, and the guy Johan built me this one. Ill attach the pics and stats he sent me. I think this is a descent deal! 49 euros (62$) for this unit. What do you all think.


Hi,

I've build the LPM but it's not completely comparable to a normal Basic LPM. It has a slightly larger drift (~1.5% @1000mW) and offset (drifting between 0 and 7mW). Also the sensor is not exactly in the center of the heatsink, something went wrong. Using a 40x40mm active area was experimental after all. If you still want it I'll give you a 30% discount, it would be a 49 euro lpm. I've included a photo and the calibration certificate.

The other option is a normal Basic LPM. I still have 1 Basic LPM, it the first I build and I use it as construction reference model. Or I could make one when parts come available, I estimate that to be 2 weeks. A normal Basic LPM is quite stable, a smaller sensor means less noise.

Let me know what you think.

Regards,
Johan
Click to expand...



Customer: Name: Email:
Laser Power Meter Description of LPM Accuracy: Warm-up time
Adjustment: Recoating:
Measurements: Measurement range Wavelength Applied Power:
982144:22:51.00
Room temperature:
Joe jjooee@gmail.com
Bluefan Custom LPM, serial no. 12-02-0001
Calibration Certificate
5% 30 minutes
Yes No
2W 447nm 1.0015W
 

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  • lpm.jpg
    lpm.jpg
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lasersbee

lasersbee

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Sep 20, 2008
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Ask the seller to supply a smaller Sensor...

The stable response time of a 40mm X 40mm must
be quite long..

Our 8mm X 8mm Thermopile sensors have a response
time of ~10-15 seconds where our 15mm X 15mm sensors
have a stable response time of ~40-50 seconds.

I would imagine that a 40mm X 40mm sensor would have
a significantly longer stable response time. We have not
tested a sensor as large as this ourselves..


Jerry
 
Last edited:
Joe Mo

Joe Mo

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Thanks jerry, I will ask him. I think I'm going to buy it, just for the price.
 
Bluefan

Bluefan

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This looks familiar :)

I ran out of parts, this experimental large sensor is the result. Because of it's lower performance the price is also lower. I haven't actually timed the response time but it is very similar to the normal 20x20mm sensors (34 sec 0-90%), the construction of the two is probably similar. If you want I'll do a measurement and show the complete rise and fall curves.
 
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