ZTP 135 IR circuit

I want to have a circuit design and how to use the sensor ZTP 135 IR. I want to apply it to measure human skin temperature and expect the output to be voltage. I have looked at its datasheet but can not find the connection schematic. The best I can found is here http://www.thermometrics.com/assets/images/thermopile.pdf but it does not specify the values (R, C, V). I'm new to electronics, and I just need a circuit to implement. Any specific help will be welcomed. Thank you.

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DAB over 13 years ago

Go to the GE website and get the Data Sheet for the device. It should provide you with the details and usually include a nominal hookup circuit to drive and read the output.
I would guess at this point that VCC is probably 3-5v DC. Output is probably analog, so you would be looking at an OpAmp and an ADC to digitize the output.
Once you get the Data Sheet, you can probably hookit up to one of Jeremy's Arduino circuits that measures a light sensor.

DAB
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Former Member over 13 years ago in reply to DAB

Dear DAB,

I tried to post the datasheet link here but it didnot appear. Ok here is the datasheet http://www.ge-mcs.com/download/temperature/920-159B-LR.pdf and the circuit http://www.analog.com/static/imported-files/solutions_bulletins/medical04-08/AD8538_large.html again. As you see, there is no circuit in the datasheet itself, so I seek for a way to use it.
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Former Member over 13 years ago

Hi,

Thermopile is a device that spontaneously generates a voltage due to Seebeck effect. So, you don't need to feed the thermopile at all. However, as the voltage generated is usually very low, what you need is to connect the thermopile terminal to a operational amplifer and the thermopile GND to the ground terminal in your circuit. Interfacing thermopile in such way, you will get enoug signal level to process it.

See this Melexis' thermopile datasheet for more information: http://www.yeint.ru/suppliers/melexis/pdf/MLX90247_v2.pdf
Another interesting link: http://www.stw.nl/NR/rdonlyres/A171FDEF-3625-4F05-9D6D-7EF0BE6CEE78/0/atghiaee.pdf

Hope this helps.
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michaelkellett over 13 years ago in reply to Former Member

Google for "thermopile amplifier" - lots of hits, the first few Analog Devices ones are quite useful.
MK
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D_Hersey over 11 years ago

First, make sure pyrometry works well here. Pyrometers are somewhat sensitive to albedo. Test this by matching data from a more conventional technique and a big-box pyrometer.
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patnat over 6 years ago in reply to Former Member

Hello,

I realise that this is a very old discussion to open up again but I am trying to build a circuit for the ZTP-135SR thermopile IR sensor and I have an idea of the circuit diagram cannot seem to find any other circuit designs or the equation for the temperature at a given resistance for it.

I tried to click the link you provided but the page is unavailable.
I would really appreciate any suggestions you may have.

Thank you.

NP
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