Noncontact infrared thermometer based on a self-oscillating lambda type system for measuring human body´s temperature

There has been developed a device for temperature measuring based on a self-oscillating system, whose equivalent circuit has been implemented on the lambda diode´s schematic analog, that provides high sensitivity and allows solving the problem of increasing accuracy of measuring human body´s temperature in the noncontact way. The measurement error is ±0.1% within the operating range of (32-43)°C, the measuring time being 1 s, and at a the frequency instability of 3·10^-4.