Millimeter wave multi-pixel refrigeration receiver dewar

A technology of millimeter wave and receiver, which is applied in the field of dewar of multi-beam receiver of low-temperature refrigeration in the millimeter wave band, which can solve the problem of high cooling power requirements and achieve the effect of reducing heat radiation and cooling power requirements

Inactive Publication Date: 2011-04-06
ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

In order to overcome the problem that the design of the existing millimeter-wave band multi-pixel refrigeration receiver Dewar cold screen design requires too much cooling power, the present invention provides a Dewar whose cold screen can effectively block heat radiation, and at the same time Does not affect receiver sensitivity, thus reducing the need for cooling power from the refrigerator

Method used

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  • Millimeter wave multi-pixel refrigeration receiver dewar
  • Millimeter wave multi-pixel refrigeration receiver dewar
  • Millimeter wave multi-pixel refrigeration receiver dewar

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Embodiment 1

[0020] like figure 1 As shown, the millimeter-wave multi-pixel receiver Dewar includes a vacuum chamber 1 and a cold screen 2 disposed in the vacuum chamber, and an array composed of nine detectors of the 9-pixel millimeter-wave cooling receiver is located on a 4K cold stage 3, Between the 4K cold stage 3 and the vacuum chamber 1 is a cold shield 2 with a temperature of 50K. The material of the cold screen is copper, and the inner and outer surfaces are polished and chrome-plated to reduce emissivity. There are 9 independent circular windows 10 on the top of the cold screen, see figure 2 , each circular window corresponds to a detector. The diameter of the window is equal to the -30dB edge taper of the detector beam at the position of the cold screen window, so that the occlusion of the window to the beam is limited to the allowable range, so that the detected millimeter wave signal can pass through these windows almost without occlusion and reach the detector .

[0021] ...

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Abstract

The invention relates to a millimeter wave multi-pixel refrigeration receiver dewar. The cold shield of the dewar can effectively shield the thermal radiation without affecting the sensitivity of a receiver, thereby lowering the requirement of the refrigerating machine on refrigeration power. The millimeter wave multi-pixel refrigeration receiver dewar comprises a vacuum chamber and a cold shield arranged in the vacuum chamber, wherein the cold shield is provided with a plurality of circular windows; the circular windows are corresponding to detectors arranged in the cold shield; each circular window comprises a through hole and a dielectric lens; the through hole is arranged on the upper surface of the cold shield; the dielectric lens covers on the through hole and has certain thickness; and the edge of the dielectric lens is fixed on the upper surface of the cold shield.

Description

technical field [0001] The invention belongs to a Dewar, in particular to a millimeter-wave low-temperature refrigeration multi-beam receiver Dewar which is used both for reducing heat radiation and performing beam transformation. Background technique [0002] Multi-pixel detection technology with spatial imaging capabilities is not only widely used in optical and infrared frequency bands (such as CCD cameras), but also gradually replaces single-pixel technology in the microwave, millimeter wave, and submillimeter wave fields with longer wavelengths, and has become an improved technology. The main measure of detection efficiency. [0003] Sensitive detectors need to work in a low temperature environment to reduce the thermal noise of the detector itself. Because they work at extremely low temperatures (for example, superconducting detectors usually work in an environment less than 4K), the noise performance of these detectors is much better than that of detectors working at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/02G01J5/06
Inventor 单文磊
Owner ZIJINSHAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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