Precision narrow band differential temperature sensor

Recently, we have created precision narrow-band temperature sensors that allow us to measure temperature with a relative error of at least 0.005 oC. These temperature sensors are designed to study the fine structure of temperature fields in the rock solid, as well as to take into account internal temperature variations in various geophysical devices. The article considers the principal ways to achieve the required accuracy of measurements, calibration, and installation of the necessary operating temperature range of the sensors. Carrying out measurements using the developed sensors in the tunnel of the North Caucasus Geophysical Observatory of the IPE RAS in the Baksan Gorge will provide unique data on the structure and dynamics of the thermal field near the Elbrus volcano.