RADIOMETER WITH CALIBRATION SYSTEM Russian patent published in 2021 - IPC G01R29/08 

FIELD: measuring devices.

SUBSTANCE: invention is used for measuring and recording the radio brightness temperatures of the underlying surface's own radio-thermal radiation. The essence of the invention is that a radiometer with a calibration system contains a series-connected receiving antenna, a two-in-one microwave switch, a high-frequency amplifier, a microwave filter, a square detector, a low-frequency amplifier, a synchronous filter, a synchronous detector, a calculation unit for multiplication-division operation and a recorder. The control inputs of the microwave switch, the synchronous filter, and the synchronous detector are supplied with modulation control signals from the modulation control device. The radiometer also contains "hot" standard agreed load, the output of which is connected to the input of the microwave switch, and structurally related sensor of the “hot” standard agreed load, the output of which is connected to the input of the calculation unit for multiplication-division operation, and the heating element, structurally associated with the "hot" standard agreed load, heating it to a predetermined temperature. In order to improve the accuracy of measurement of the radio brightness temperatures instead of microwave circulator, a "cold" standard agreed load with a structurally related thermal sensor and a solid-state "cold" noise source with a structurally related thermal sensor, "cold" noise temperature sensor from a high-frequency amplifier, structurally related with the high-frequency amplifier, the output of which is connected to the input of the calculation unit for multiplying-dividing operation, the temperature sensor of external low temperature standard, designed to be placed close to the external standard, and the microwave filter are additionally introduced. The three-in-one microwave switch is replaced with two-in-one.

EFFECT: improving accuracy of measuring the radio brightness temperatures.

1 cl, 1 dwg