A single-beam cooling receiver calibration method

Abstract

The invention relates to a calibration method of a single beam refrigeration receiver. The device involved in the method is composed of a Dewar flask, an 80K cold screen, a feed source, an orthogonalmode coupler, a first low noise amplifier, a second low noise amplifier, an 80K load vacuum window, a feed source vacuum window, an 80K load, a 293K load, a first 80K load reflector, a second 80K loadreflector, a first 293K load reflector, a second 293K load reflector, a first transmission shaft, a second transmission shaft and a third transmission shaft. According to the method, the 80K load andthe 293K load are separately arranged on the surfaces of the 80K cold screen and the Dewar flask of a receiver, the reflectors at a fixed angle are moved to the corresponding load and the feed sourcevacuum window surface by using the three transmission shafts, so that the 80K load and the 293K load can separately reflect the own radiation into the feed source, the calibration of the receiver canbe completed, and after the completion of calibration, each reflector is moved away by using the transmission shafts to perform continued observation. By adopting the method, the receiver can be quickly calibrated in an observation process, the potential safety hazards caused by using low-temperature liquid nitrogen in a traditional calibration method can be avoided, and the calibration efficiency and safety can be obviously improved.

Description

technical field [0001] The invention relates to an accurate and rapid calibration method for a single-beam receiver which is cooled as a whole during the observation process, and is specially used for calibration of the single-beam cooling receiver. Background technique [0002] Radio astronomy is a discipline of astronomical research through the observation of radio waves radiated from cosmic celestial bodies. Radio astronomy originated in the 1930s. With the rapid development of radio technology at that time, American engineer Carl Jansky accidentally discovered radio radiation from the center of the Milky Way in an experiment to find radio noise sources. For astronomy with a long history For the first time, this discovery caused a sensation in the international astronomical community; during World War II, military radars detected radio signals from the sun, which made people realize for the first time that radio radiation does exist in cosmic celestial bodies, which are l...

AI Technical Summary

Problems solved by technology

On the one hand, the operation of low-temperature loads must avoid frostbite by low-temperature liquid nitrogen, and on the other hand, it cannot be carried out during the observation process of radio telescopes.

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