![]() ![]() The IVAC9000 is now my temperature reference at 26☌ and 38☌. I also removed the potentiometer from the IVAC 9000’s high-side because it caused too much temperature drift. Using the python library I wrote a simple script that triggers a FFC, waits 45 seconds and then averages approx once/second spot-meter readings over the next 90 seconds to create an average temperature reading for use in determining a Lepton’s accuracy and linearity over a temperature range. Previous testing (two log entries ago) revealed how the Lepton’s radiometric output varied for the first approximately 30 seconds after a flat-field correction. Unlike the IVAC9000 this radiator can be adjusted to specific temperatures. The front surface of the aluminum block was coated with Black 3.0 paint to form a high-emissivity black body radiator. This setup can be controlled between 10-60☌. I used a 12V TEC sandwiched between an aluminum block (with a hole drilled in it for the NTC temperature sensor) and a CPU cooler heatsink with fan. The FC100D uses PWM and bi-directional control of the TEC along with a NTC temperature sensor to provide precise temperature control (heating and cooling). Trawling eBay netted a reasonably inexpensive Accuthermo FC100D TEC (Peltier thermo-electric cooler) controller mounted in an enclosure from Wells-CTI with a 12VDC 8A power supply and TEC H-bridge driver.
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