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Old 04-13-2012, 01:21 PM #1
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Default WTB: LPM with thermopile head

Hey guys,

I was looking for some kind of LPM with serious thermopile head just like nospin's LPM but there is a small problem with that one, nospin last activity: 03-15-2012 so I hardly see him answering PM not to mention selling one.

I'm not really interested in laserbee so right now I'm looking for calibrated LPM with thermopile head and let's just say I've got around 400 bucks for it.

I'm even willing to buy only thermopile head let's say Ophir 20C-A with amplifier (A) so the output voltage is proportional to power - this way I could make my own LPM based on the head.



Last edited by .3lite; 04-13-2012 at 01:26 PM.
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Old 04-13-2012, 01:58 PM #2
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Default Re: WTB: LPM with thermopile head

Quote:
Originally Posted by .3lite View Post
Hey guys,

I was looking for some kind of LPM with serious thermopile head just like nospin's LPM but there is a small problem with that one, nospin last activity: 03-15-2012 so I hardly see him answering PM not to mention selling one.

I'm not really interested in laserbee so right now I'm looking for calibrated LPM with thermopile head and let's just say I've got around 400 bucks for it.

I'm even willing to buy only thermopile head let's say Ophir 20C-A with amplifier (A) so the output voltage is proportional to power - this way I could make my own LPM based on the head.
http://www.ebay.ca/itm/170742944569?...84.m1438.l2649

OPHIR 150C-A-3Y Thermal laser power meter head 100W yag | eBay

Ophir Laser Power Meter Module 60W CO2 YAG Argon DPSS | eBay

Ophir OEM Laser Power Meter Sensor for CO2 YAG 60W + ZnSe Diffuser | eBay

There are many more choices out there.............


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Old 04-13-2012, 02:08 PM #3
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Default Re: WTB: LPM with thermopile head

Another more.

Ophir OEM Laser Power Meter Sensor for CO2 YAG 60W | eBay
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Old 04-13-2012, 02:23 PM #4
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Default Re: WTB: LPM with thermopile head

Thanks guy, however I've got some questions regarding this head:

Quote:
Originally Posted by piferal View Post

According to datasheet this one is optimized for CO2 lasers, does it mean it can "lie" about output of let's say 405nm laser? As far as I know wavelength shouldn't matter for non-photodiode based sensors.

Calibration: 0.1 Volts / Watt.
It doesn't look good, if I'm right it means I have to be able to measure 100uV to get resolution of 1mW.

Power range is between 60mW-60W does it mean that 60mW is definitely minimum to measure?

Last edited by .3lite; 04-13-2012 at 02:25 PM.
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Old 04-13-2012, 03:00 PM #5
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Default Re: WTB: LPM with thermopile head

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Old 04-13-2012, 03:34 PM #6
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Default Re: WTB: LPM with thermopile head

Quote:
Originally Posted by .3lite View Post
Thanks guy, however I've got some questions regarding this head:




According to datasheet this one is optimized for CO2 lasers, does it mean it can "lie" about output of let's say 405nm laser? As far as I know wavelength shouldn't matter for non-photodiode based sensors.

Calibration: 0.1 Volts / Watt.
It doesn't look good, if I'm right it means I have to be able to measure 100uV to get resolution of 1mW.

Power range is between 60mW-60W does it mean that 60mW is definitely minimum to measure?
That means has been specially calibrated (maybe special absorber coating) to these wavelengths, but that does not
mean it does not work well with others, usually this type of sensor can read correctly from 190nm to 20Ám.

I do not think the "maybe" very small difference in reading more or less, compared with the reading of a YAG laser is important to you.

No, 1mW equals 1mV, you need one voltage panel meter with 1mV of resolution.

This power range is specified by the manufacturer for a reliable reading.

I have no this model, maybe jerry can tell if can do readings below this values with fidelity​​.

If something is not right, Jerry is the specialist in these matters, anyway.
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Old 04-13-2012, 06:09 PM #7
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Default Re: WTB: LPM with thermopile head

Thanks for the answer but hey, 0.1V per 1 Watt means that resolution is 1mW = 100uV:
0.1V = 100mV
1W = 1000mW
0.1 / 1000 = 0,0001 = 100uV

Therefore to have resolution of 1mW I need to be able to read properly uV and as we all know it's really hard to get any voltage meter capable of that.

The best idea would be to get head with resolution of 1V/1Watt.
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Old 04-13-2012, 06:31 PM #8
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Default Re: WTB: LPM with thermopile head

Quote:
Originally Posted by .3lite View Post
Thanks for the answer but hey, 0.1V per 1 Watt means that resolution is 1mW = 100uV:
0.1V = 100mV
1W = 1000mW
0.1 / 1000 = 0,0001 = 100uV

Therefore to have resolution of 1mW I need to be able to read properly uV and as we all know it's really hard to get any voltage meter capable of that.

The best idea would be to get head with resolution of 1V/1Watt.
All you would need to do is add a low drift precision Amplifier with a gain
of 10 to change the 0.1V/W to 1V/W.....


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Last edited by lasersbee; 04-13-2012 at 06:33 PM. Reason: Spelling errors
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