Black body cavity radiation source

A technology of black body cavity and radiation source, applied in the field of black body cavity radiation source, can solve the problems of limiting the improvement of measurement calibration and indexing accuracy of infrared thermometers, and achieve high stability, increase emissivity, and high emission rate effect

Inactive Publication Date: 2010-10-27
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the emissivity of the blackbody cavity can only reach about 0.99, which limits the improvement of the measurement calibration and graduation accuracy of the infrared thermometer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The liquid medium 16 in the liquid thermostat 1 used in this example is silicone oil (not limited to silicone oil, it can also be other oils or water), and the temperature control range of the temperature control device 15 is -50°C to 300°C. Less than ±0.1°C.

[0040] In this example, the second-class standard platinum resistance thermometer WZPB-2 (measuring temperature range is -183-420° C.) is used as the standard thermometer 8 to measure the temperature of the cavity inner shell 4 .

[0041] figure 1 The cavity inner shell 4 and the cavity shell 6 shown are made of aluminum material (not limited to aluminum, but also other metals with good thermal conductivity such as copper) with a thickness of 5 mm, wherein:

[0042] 1) The cavity inner shell 4 is welded by a cylindrical cavity 2 with an inner diameter of 30 mm and a length of 120 mm and a conical cavity with a cone angle of 120 degrees and a bottom inner diameter of 30 mm, and the concentricity deviation is requ...

Embodiment 2

[0057] The liquid medium 16 in the liquid thermostat 1 used in this example is water (not limited to water, it can also be silicone oil or other oils), the temperature control range of the temperature control device 15 is 0°C to 100°C, and the temperature control accuracy is less than ±0.1°C.

[0058] In this example, the second-class standard mercury-in-glass thermometer WLB-21 (the measuring temperature range is 0-50° C. or 50-100° C. as required) is used as the standard thermometer 8 to measure the temperature of the cavity inner shell 4 .

[0059] Refer to Example 1 for other specific embodiments.

[0060] In this example, the blackbody cavity is an isothermal cavity, and the cavity emissivity ε c The calculation of can be calculated by integral equation theory (also known as Buckley-Sparrow-Bedford theory), the calculation formula is

[0061] ϵ a ( x 0 ) = ...

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Abstract

The invention discloses a black body cavity radiation source which comprises a liquid thermostat, a black body cavity, a temperature controller, a pump and a standard thermometer. The black body cavity and the temperature controller are installed in the liquid thermostat, the black body cavity comprises a cavity inner shell and a cavity outer shell, and the inner wall of the cavity inner shell and the inner wall of the cavity outer shell are coated with black diffuse reflection coatings. The cavity inner shell with the front end being a conical cavity and the rear end being a columniform cavity is coaxially installed in the liquid thermostat, and the cavity outer shell with the same shape as that of the cavity inner shell is installed outside the cavity inner shell to form an equally spaced hollow interlayer. The end surface of the cavity inner shell is connected with the outer wall of the liquid thermostat, a conical cavity opening of the cavity outer shell is communicated with a pump shell, the pump shell is communicated with the liquid thermostat through the opening, an impeller in the pump shell is connected with a motor through a pump shaft, the standard thermometer is arranged in the hollow interlayer, and openings are equally distributed on the cavity outer shell. In the invention, the cavity outer shell and the pump are additionally arranged to enable liquid medium in the thermostat to flow in a circulating way in the hollow interlayer, thereby improving the temperature distribution of a black body cavity, enabling the black body cavity to have the characteristic of isothermy and further enhancing the emissivity of the black body cavity.

Description

technical field [0001] The invention relates to a black body cavity radiation source. Background technique [0002] With the continuous development of infrared detector technology, infrared thermometers have been more and more widely used. In the past few years, the epidemic of "SARS" and "H1N1 flu" has greatly accelerated this process, causing a sharp increase in the number of infrared thermometers used in our country. According to incomplete statistics, the infrared thermometers currently used in various places in our country The number of thermometers has exceeded 300,000. Now, the general trend of infrared thermometers is to develop into the fields of fast, long-wave, medium temperature, normal temperature, and low temperature, which were generally only used in the short-wave area above 500°C in the past. [0003] Infrared thermometers can be divided into two types: monochromatic (narrow band) and full radiation (broad band). At present, my country imports a lot of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/00H05B3/02G01J5/00
Inventor 孙坚邹超吴娟陈乐崔志尚
Owner CHINA JILIANG UNIV
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