Diamond compound film piece used for absolute bolometer and method for producing the same

A bolometer and composite diaphragm technology is applied in the field of radiation-absorbing diamond composite diaphragm and its preparation, which can solve the problems of low sensitivity, low measurement accuracy of radiometer, low thermal conductivity, etc., so as to improve adaptability and service life, improving measurement accuracy and sensitivity, and the effect of small changes in absorption rate

Inactive Publication Date: 2008-08-20
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The thermal conductivity of these materials is not too high, the combination of the reflective black paint and the silver cavity is not high, and the radiation absorption rate of the reflective black paint will gradually decrease after long-term ultraviolet irradiation on the satellite, which will affect the absolute radiation. The measurement of the solar irradiance by the radiometer leads to a decrease in the measurement accuracy, low sensitivity and long measurement time of the radiometer

Method used

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  • Diamond compound film piece used for absolute bolometer and method for producing the same

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Effect test

Embodiment 1

[0021] A diamond composite diaphragm used on an absolute bolometer is composed of a pure diamond sheet as a heat sink material and a carbon nanotube film as a light radiation absorbing material, and the diamond sheet is a thermal Conductivity ≥ 15W / K cm, resistivity 10 13 ~10 15 Ω·cm colorless transparent diaphragm; the carbon nanotube film layer is a tubular structure formed by carbon atoms bonded and interconnected, evenly distributed on the diamond sheet, and the carbon nanotube film layer has a thermal conductivity of 7 ~10W / K·cm, resistivity 10 9 ~10 13 Ω·cm.

[0022] Concrete preparation process is as follows:

[0023] (1) A chemical vapor deposition heat sink diamond sheet. The heat sink diamond film is prepared by MW-PCVD microwave plasma chemical vapor deposition system, which belongs to the electrodeless discharge method, and high-quality high-purity transparent diamond film can be obtained under relatively low pressure. Metal molybdenum plate was used as the s...

Embodiment 2

[0031] Prepare the diamond composite diaphragm used on the absolute absolute bolometer by the same method steps as in Example 1, the difference is only in:

[0032] (1) The process condition of a chemical vapor deposition heat sink diamond sheet is: H 2 The flow rate is 200sccm, CH 4 The flow rate is 1sccm, the microwave power is 3.8KW, the deposition pressure is 17KPa, the substrate temperature is 950°C, and the growth rate is about 1μm / h. The obtained diamond diaphragm has a thermal conductivity of 18W / K cm and a resistivity of 10 15 Ω·cm.

[0033] (2) The technological conditions of the deposition of carbon nanotube film layer by the floating catalytic method are: in the heating stage, the reaction chamber is filled with N 2 Protection, control its flow rate to 55sccm; when the reaction temperature reaches 800°C, feed C 2 h 2 gas while controlling C 2 h 2 The gas flow rate is 35sccm, N 2 The flow control is 200sccm, and the quality of ferrocene is controlled at 0.6g...

Embodiment 3

[0036] Prepare the diamond composite diaphragm used on the absolute absolute bolometer by the same method steps as in Example 1, the difference is only in:

[0037] (1) The process condition of a chemical vapor deposition heat sink diamond sheet is: H 2 The flow rate is 200sccm, CH 4 The flow rate is 2sccm, the microwave power is 4KW, the deposition pressure is 13KPa, the substrate temperature is 750°C, and the growth rate is about 2μm / h. The thermal conductivity of the prepared diamond sheet is 17W / K cm, and its resistivity is 10 14 Ω·cm.

[0038] (2) The technological conditions of the deposition of carbon nanotube film layer by the floating catalytic method are: in the heating stage, the reaction chamber is filled with N 2 Protection, control its flow rate to 50sccm; when the reaction temperature reaches 800°C, feed C 2 h 2 gas while controlling C 2 h 2 The gas flow rate is 40sccm, N 2 The flow control is 170sccm, and the ferrocene quality is controlled at 0.75g. A...

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Abstract

The present invention relates to a radiation-absorbing heat exchange sheet material on the absolute bolometer for measuring the solar radiation, especially to a diamond composite film used on the absolute bolometer and the preparing method thereof. The diamond composite film used on the absolute bolometer in the invention is prepared by compounding the pure diamond piece layer which is taken as the heat sink material and the black boron-doping diamond film that is taken as the light radiation absorbing material. The preparing method is firstly preparing the heat sink diamond piece with a one-time chemical vapor deposition, and then depositing the carbon nano-tube film layer on the diamond piece with a floating catalytic method. The diamond composite film of the invention has the advantages of strong heat and impact resistance, higher absorbing rate to the radiation and the rate is up to 99%, and stability for a long period; and the surface adhesions of the heat sink material and radiation-absorbing material are excellent. Thereby the measuring precision and sensitiveness of the bolometer can be increased and the measuring period can be shortened, and the adaptability of the absolute bolometer in the working condition of satellite is increased.

Description

technical field [0001] The invention relates to a radiation-absorbing and heat-exchanging sheet used on an absolute bolometer for measuring solar radiation on a satellite, in particular to a radiation-absorbing diamond composite diaphragm and a preparation method thereof. Background technique [0002] In order to study the Earth's radiation budget and energy cycle and its impact on the global environment and climate change, precise measurement and long-term monitoring of solar irradiance are required. The instrument used to observe solar irradiance on satellites is an absolute bolometer, and a black radiation-absorbing material is required on an absolute bolometer for measuring solar irradiance to absorb radiation. Absolute bolometers are placed on meteorological satellites for observation, which requires that the black radiation-absorbing material and heat sink material on the absolute bolometer should not only be tightly combined, have good mechanical properties, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/02
Inventor 梁中翥梁静秋王维彪曾乐勇方伟
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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