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Millimeter wave blackbody radiation calibration source with biconical cavity serial structure

A series structure, black body radiation technology, applied in the field of millimeter wave black body radiation calibration source, can solve the problems of performance offset, influence, etc., to achieve the effect of improving the thermal conductivity and improving the absorption rate

Inactive Publication Date: 2010-03-10
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

Unlike some devices, for the millimeter-wave blackbody radiation calibration source, the structure and the specific size parameters of the structure have a significant impact on the performance under specific working conditions, and in some cases the small size difference It may bring a large performance offset

Method used

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  • Millimeter wave blackbody radiation calibration source with biconical cavity serial structure

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Embodiment 1

[0025] The frustum cavity 2 shown is obtained by truncating part of the cone tip of the conical cavity. The diameter a of the upper bottom surface, the diameter b of the bottom surface of the transition cavity 3, the diameter c of the bottom surface of the conical cavity 4, and the height k of the conical cavity 4 are equal. The busbar of the conical cavity 2 is clamped with the central axis The angle α is equal to the semi-cone angle φ of the conical cavity 4, and the diameter a' of the lower bottom surface of the conical cavity 2 is equal to the diameter b' of the upper bottom surface of the transition cavity 3.

[0026] For blackbody calibration sources, slight size differences can lead to large performance gaps. The difference in performance between a higher or lower vertebral body and a larger or smaller bottom edge is very large. By optimizing the size and structure of the cavity, the microwave energy entering the lower cavity is confined in the lower cavity as much as p...

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Abstract

The invention discloses a millimeter wave blackbody radiation calibration source with a biconical cavity serial structure, which is cylindrical as a whole and has a cylindrical structure made of metalmaterial. An integrated cavity structure connected in series by a lip, a circular cavity, a transition section and a conical cavity which are all in rounding off from top to bottom is arranged in thecenter of a cylinder, and the opening surface of the cavity is arranged in the center of the top of the cylinder. A cavity inner wall wave-absorbing material coating is made of wave-absorbing material coated on the inner wall of the cavity according to the required thickness. The invention lowers the probability that radiation energy incident from the opening surface is reflected and returned from the opening surface during transmission in the cavity so that the radiation energy is reflected many times in the cavity and absorbed. Through controlling the coating depth, the invention solves theproblem that the consistency of temperatures of blackbody calibration sources is influenced due to overlarge coating depth and poor thermal conductivity while improving the absorptivity of the cavityinner wall of the blackbody radiation calibration source to the radiation energy.

Description

technical field [0001] The invention relates to a millimeter-wave blackbody radiation calibration source with a double-cone cavity series structure. The black body is a calibration load suitable for on-board and ground calibration of remote sensing satellite spaceborne millimeter-wave radiometers, and can also be used for calibration of other millimeter-wave equipment. Background technique [0002] As an important observation method of remote sensing satellites, millimeter-wave remote sensing technology is used to obtain information on observation objects such as the sky, the ground, the atmosphere, and the ocean. As the main observation equipment for millimeter-wave remote sensing, the spaceborne microwave radiometer needs to be accurately calibrated and calibrated for the observed energy radiation during the design and use process, so as to ensure the accuracy of the measured values ​​under changing environmental conditions and equipment states and consistency. This requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/52
Inventor 苗俊刚马宁白明肖东胡岸勇刘大伟
Owner BEIHANG UNIV
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