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
.