Focal plane imaging type radiometer temperature sensitivity testing system

Abstract

The invention discloses a focal plane imaging type radiometer temperature sensitivity testing system comprising a millimeter-wave test case, a direct-current power supply III, an oscilloscope and a to-be-tested radiometer. The millimeter-wave test case consists of a direct-current power supply II, a millimeter-wave noise head, a millimeter-wave hand-operated adjustment precision attenuator, a coaxial line II, a coaxial waveguide conversion joint II, a waveguide coaxial conversion joint, and a coaxial line III. The direct-current power supply II and the direct-current power supply III provide excitation and bias voltages for the millimeter-wave noise head and the to-be-tested radiometer. The millimeter-wave noise head is used for generating a calibrated noise temperature output. The millimeter-wave hand-operated adjustment precision attenuator is used for carrying out attenuation value adjustment and outputting a corresponding noise temperature as a reference of temperature sensitivitymeasurement of the to-be-tested radiometer. The oscilloscope completes collection of output data of the to-be-tested radiometer. Compared with the traditional radiometer temperature sensitivity testing system, the focal plane imaging type radiometer temperature sensitivity testing system disclosed by the invention has advantages of simple equipment, simple operation, and high adjustability and flexibility for equivalent noise temperature testing and the like.

Description

technical field [0001] The invention relates to a sensitivity testing system, in particular to a focal plane imaging radiometer temperature sensitivity testing system. Background technique [0002] At present, the measurement of microwave radiometers mostly adopts the overall measurement system, and there is no special test equipment. When measuring microwave radiometers, a large-area radiation source with adjustable temperature and emissivity close to 1, and a closed microwave anechoic chamber are required to isolate Interference from the external environment and supporting equipment. During the test, point the radiometer to be tested to the radiation source, and change the radiation amount of the radiation source by changing the physical temperature of the radiation source to obtain the temperature sensitivity of the radiometer. The radiation source used for calibration is made of materials with known emissivity, and its temperature is changed by liquid nitrogen or exte...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a focal plane imaging radiometer temperature sensitivity test system, which solves the problems of strict requirements on the test site, high requirements on the temperature consistency of the radiation source, complicated test process, long test time and low efficiency in the traditional test system

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