Dear Steve
I need you to please expand on this for clarity. >The spectrum of the emiission changes, and the sensor materials used for low temperature IRs can't cope. Do you mean the high temp sensors can't pick up the low temps? Or they have a preferred range? The ones I have used cover -50 to 999. The ones for house evaluations are about -50 to +250. >I use precision IR thermometers for operation at between 500 and 2000C, they have no sensitivity below 500C. Very interesting. I have never had my hands on something that goes that high. Is the lack of sensitivity because of the need to spread out the incoming heat to limit damage to the cell? Interesting problem to solve. Yours must have 4 digits. Maybe more? How accurate is 'precision'? Thanks Crispin
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