Old 01-14-2012, 05:14 PM #1
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Default Should I buy this LPM for 62$ USD?

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.


Quote:
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


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
Attached Thumbnails
Should I buy this LPM for 62$ USD?-lpm.jpg  
Attached Files
File Type: pdf Calibration_certificate_custom_12_02_0001.pdf (82.3 KB, 175 views)



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Old 01-14-2012, 05:59 PM #2
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Default Re: Should I buy this LPM for 62$ USD?

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
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Old 01-14-2012, 06:14 PM #3
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Default Re: Should I buy this LPM for 62$ USD?

Thanks jerry, I will ask him. I think I'm going to buy it, just for the price.
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Old 01-14-2012, 06:48 PM #4
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Default Re: Should I buy this LPM for 62$ USD?

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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Old 01-14-2012, 07:00 PM #5
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Default Re: Should I buy this LPM for 62$ USD?

Sounds great Johan! I'll buy it today also!
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Old 01-14-2012, 09:42 PM #6
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Default Re: Should I buy this LPM for 62$ USD?

Just sent the money, will be shipped out on monday. I will review it in the reviews section. I also ordered this today: LZSK - 532nm 300mW High Power Green Laser Pointer Separate Crystal

I already have an arctic from wl. I will LPM that for sure. I hope its better than 700mW :/ but I will be able to see if the power certificate from lazerer matches this LPM roughly.
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Old 01-14-2012, 09:49 PM #7
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Default Re: Should I buy this LPM for 62$ USD?

Quote:
Originally Posted by Joe Mo View Post

I already have an arctic from wl. I will LPM that for sure.
Prepare to be disappointed
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Old 01-14-2012, 10:15 PM #8
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Default Re: Should I buy this LPM for 62$ USD?

Quote:
Originally Posted by Joe Mo View Post
Be prepared to wait a month because Lazerer is on holiday until Feb 1st!
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Old 01-14-2012, 11:44 PM #9
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Default Re: Should I buy this LPM for 62$ USD?

Quote:
Originally Posted by sopark4000 View Post
Prepare to be disappointed
haha I know. It will not be close to 1000 I know. Im expecting ~700-750
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Old 01-14-2012, 11:45 PM #10
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Default Re: Should I buy this LPM for 62$ USD?

[QUOTE=Sigurthr;1018334]
Quote:
Originally Posted by Joe Mo View Post
I also ordered this today: LZSK - 532nm 300mW High Power Green Laser Pointer Separate Crystal
QUOTE]

Be prepared to wait a month because Lazerer is on holiday until Feb 1st!
Yeah I figure late feb
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