[volt-nuts] Eppley Thermopile

[Neville Michie]

If it is like the Funk pattern radiometer it will have a very thin  
polyethylene film cover to prevent air currents advecting heat to the  
thermopile.
I made a couple of Funk type radiometers using small bismuth teluride  
(the common cooling devices)  peltier elements. You can get a rough  
calibration by pointing it normal to sunlight on a day with a clear  
blue sky, close enough to 1000W/m2. (+ - 10%).

Cheers, Neville Michie

On 22/09/2011, at 2:32 PM, J. L. Trantham wrote:

> Well, according to my digital caliper, the 'shank' measures 0.498  
> inches or 12.62 mm.
>
> My caliper has not been calibrated.
>
> The 'business end' of the unit has a 'slit' shaped opening, about  
> 18.88 mm high and about 2.65 mm wide with a 'V' shaped area in the  
> vertical direction.  That 2.65 mm opening looks to be adjustable  
> with two screws that allow the sides to be moved in or out.  I have  
> not been (and will not be) adjusting it.  There appears to be a  
> glass covering over the thermopiles.
>
> Perhaps, in a coming decade, I will find a use for it.
>
> Joe
>
>
> ----- Original Message ----- From: "J. Forster" <jfor at quikus.com>
> To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Sent: Wednesday, September 21, 2011 10:47 PM
> Subject: Re: [volt-nuts] Eppley Thermopile
>
>
>>> John is correct.  The mount is, indeed, a Spindler & Hoyer  
>>> Gottingen,
>> made in Germany.
>>
>> Note that the in is likely 13.7 mm OD...  not 1/2" as you might  
>> expect.
>> Ealing made compatible stuff.
>>
>> I also think he is correct about what the 'thing' is.
>>>
>>> Measuring the voltage from the unit with the 7081 with aluminium  
>>> tape over
>>> the front, I get pretty close to 0.0 uV.  With the tape removed  
>>> and the
>>> lights on in the shop, I get about 2 uV.  With a small, three AAA  
>>> battery
>>> powered, LED flashlight illuminating it from close range, I get  
>>> about 280
>>> uV.
>>
>> Be careful. The disk and thermopiles are very delicate. Don't even be
>> tempted to even blow on them.
>>
>>> I am not sure what I will ever use it for but it is 'on the shelf'.
>>
>> They are very useful in an optics lab, and are essentially transfer
>> standards between optical power and voltage.
>>
>> -John
>>
>> ================
>>>
>>> Thanks,
>>>
>>> Joe
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>>
>>
>>
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