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Old 04-29-2012, 07:19 AM   #1
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Default How much power does an Ophir head use

The ones with built in amplifiers like the 20c-a or 150c-a.
Spesificly how much current do the consume.

also is there a good place to buy them right now?
I see a few 150c-a's on ebay,
but I dont see 20c-a's for sale anywhere

Thanks, Justin
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Old 04-29-2012, 07:33 AM   #2
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Default Re: How much power does an Ophir head use

My Ophir head, DC-DC converters and LCD draw a combined 150mA. I don't remember exactly what the separate draw was but I thought the LCD was drawing most of it.
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Old 04-29-2012, 09:37 AM   #3
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Default Re: How much power does an Ophir head use

The big problem with the 150c-a, at least in terms of simplicity, is that there's not a direct mW/mV relationship. Errrr, that's a bad way of saying it. There's not a relationship that is a multiple of 10.

I think it's either 3W per 1V, or 1W per 300mV, something like that (from memory of the last one I looked up).

That means it's slightly more complicated to create an output display.
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Old 04-29-2012, 09:47 AM   #4
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Default Re: How much power does an Ophir head use

The OPHIR 20C heads draw ~5mA per supply rail
at 9VDC.


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Last edited by lasersbee; 07-01-2012 at 01:03 PM.
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Old 04-29-2012, 10:28 AM   #5
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Default Re: How much power does an Ophir head use

Quote:
Originally Posted by DTR View Post
My Ophir head, DC-DC converters and LCD draw a combined 150mA. I don't remember exactly what the separate draw was but I thought the LCD was drawing most of it.
Thanks

Quote:
Originally Posted by rhd View Post
The big problem with the 150c-a, at least in terms of simplicity, is that there's not a direct mW/mV relationship. Errrr, that's a bad way of saying it. There's not a relationship that is a multiple of 10.

I think it's either 3W per 1V, or 1W per 300mV, something like that (from memory of the last one I looked up).

That means it's slightly more complicated to create an output display.
This one claims to be .1v/W
but why would .3v/W be an issue?
Wouldn't a simple voltage divider get it to a 10x multiple?
or worst case just an op amp

Quote:
Originally Posted by lasersbee View Post
The OPHIR 20C heads draw ~5mA per supply rail
at 9VDC.


Jerry
Sweet, thats not much at all, should be very easy to build a driver for one.


So anyone know where to get a 20c-a

EDIT: Also the 150c-a I linked to says it has a ZnSe Diffuser,
Is that an issue?
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Last edited by justinjja; 04-29-2012 at 10:34 AM.
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Old 04-29-2012, 10:45 AM   #6
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Default Re: How much power does an Ophir head use

Of course you can add an amplifier to get a standardized
reading but it comes back to the most common problem...

How to calibrated the readings without a Calibrated LPM.


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Last edited by lasersbee; 07-01-2012 at 01:03 PM.
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Old 04-29-2012, 08:28 PM   #7
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Default Re: How much power does an Ophir head use

If the Ophir head outputs 0.3V/W, then if you set up OpenLPM with 0.3V/W and the Arduino's internal 1.1V reference you can easily get it up and running.

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Old 04-30-2012, 04:42 AM   #8
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Default Re: How much power does an Ophir head use

I saw a datasheet for the 20c-a and it says the minimum power is 200mW
Does that mean it is just slightly less accurate below 200mW, or it actually wont work below 200mW?
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Old 04-30-2012, 05:22 AM   #9
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Default Re: How much power does an Ophir head use

Quote:
Originally Posted by justinjja View Post
I saw a datasheet for the 20c-a and it says the minimum power is 200mW
Does that mean it is just slightly less accurate below 200mW, or it actually wont work below 200mW?
Well, I've accurately measured a 2.7mW GreeNe on an Ophir head using OpenLPM. We obviously need more data points, but I'd say it's very usable.

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Old 04-30-2012, 09:21 AM   #10
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Default Re: How much power does an Ophir head use

I think I'll stick to the "buy one from laserbee and not have to screw with all that" incentive
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Old 04-30-2012, 11:42 AM   #11
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Default Re: How much power does an Ophir head use

Quote:
Originally Posted by justinjja View Post
I saw a datasheet for the 20c-a and it says the minimum power is 200mW
Does that mean it is just slightly less accurate below 200mW, or it actually wont work below 200mW?
We've accurately measured below 5mW with a standard DMM
connected to an OPHIR 20C Thermile running on 2 standard
9V batteries..

Just remember to precisely center the Laser's beam in the 12mm
diameter Active area of the sensor or your readings will be skewed.

The surface area of the OPHIR Sensors do not give a linear output
on different areas of the active area...


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Last edited by lasersbee; 07-01-2012 at 01:04 PM.
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Old 04-30-2012, 12:26 PM   #12
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Default Re: How much power does an Ophir head use

Quote:
Originally Posted by lasersbee View Post
Of course you can add an amplifier to get a standardized
reading but it comes back to the most common problem...

How to calibrated the readings without a Calibrated LPM.
It wouldn't matter if it were calibrated at 1v/w or 3v/w though, as long as you know the value its calibrated to. A 1/3, 1/3.333 divider or 3 / 3.333x multiplier can be made to great precision without any calibration involved.

Most resistors have 1% tolerances (and usually fall well within them), but even if you don't want to rely on that, a simple voltage meter can be used to set the exact ratio with a potmeter.
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Old 04-30-2012, 03:44 PM   #13
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Default Re: How much power does an Ophir head use

Quote:
Originally Posted by lasersbee View Post
Just remember to precisely center the Laser's beam in the 12mm
diameter Active area of the sensor or your readings will be skewed.

The surface area of the OPHIR Sensors do not give a linear output
on different areas of the active area...
Interesting, Do you know how one of these sensors works?
Im guessing they arn't based on a simple tec?
Is that how they are able to get a reading so quickly?
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Old 04-30-2012, 04:43 PM   #14
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Default Re: How much power does an Ophir head use

Quote:
Originally Posted by justinjja View Post
Interesting, Do you know how one of these sensors works?
Im guessing they arn't based on a simple tec?
Is that how they are able to get a reading so quickly?
It's based on the same principle (a heat differential creating a voltage potential across thermocouples), but the Ophir sensors use a thin piece of graphite as the sensitive surface. It has fairly low heat capacity and is very well heatsinked, so it's quite responsive.

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Old 04-30-2012, 11:52 PM   #15
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Default Re: How much power does an Ophir head use

Isn't it more or less a small, around active area, surrounded by a ring of thermocouples?

The operating principle is fundamentally the same, but the mechanical construction is such that it allows faster response times and more sensitivity compared to 'ordinary' TEC's where the heat has to go from the front to the back trough the thickness of the entire element?
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Old 05-02-2012, 03:42 AM   #16
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Default Re: How much power does an Ophir head use

Quote:
Originally Posted by Benm View Post
It wouldn't matter if it were calibrated at 1v/w or 3v/w though, as long as you know the value its calibrated to. A 1/3, 1/3.333 divider or 3 / 3.333x multiplier can be made to great precision without any calibration involved.

Most resistors have 1% tolerances (and usually fall well within them), but even if you don't want to rely on that, a simple voltage meter can be used to set the exact ratio with a potmeter.
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