Three-cavity blackbody radiation source for measuring emissivity

A blackbody radiation source, emissivity technology, applied in optical radiation measurement, measuring device, radiation pyrometry, etc., can solve problems such as inability to compare real-time data, poor timeliness, and inability to measure multiple samples to be tested at the same time. The effect of increasing the fixing device, easy to disassemble, and easy to place the sample

Inactive Publication Date: 2012-12-19
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When measuring the emissivity of materials, the single-cavity blackbody radiation source used in the past cannot measure multiple samples to be tested at the same time, and cannot perform real

Method used

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  • Three-cavity blackbody radiation source for measuring emissivity
  • Three-cavity blackbody radiation source for measuring emissivity
  • Three-cavity blackbody radiation source for measuring emissivity

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with drawings and embodiments.

[0023] The key components of the present invention are three equidistantly arranged blackbody cavity shells. In order to measure the emissivity of the tested sample more accurately, the emissivity of the blackbody cavity shell (including effective emissivity and integral emissivity) must be close to 1. In view of this, the following measures have been taken:

[0024] a) Designed as a cylindrical cavity with a conical bottom. Coupled with the conical cavity helps to increase the chance of multiple reflections in the cavity, thereby increasing the emissivity of the cavity;

[0025] b) The ratio of the diameter D of the cylindrical cavity to the length L of the cylindrical cavity is D:L is 1:4~6. Theoretically analyze the ratio between the cavity diameter D and the cavity length L, which not only has a high cavity emissivity, but also facilitates graduation in practice....

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Abstract

The invention discloses a three-cavity blackbody radiation source for measuring emissivity. The three-cavity blackbody radiation source comprises a liquid thermostat for holding a liquid medium inside, blackbody cavity shells, a temperature control device and a standard thermometer; the number of the blackbody cavity shells is three; the blackbody cavity shells consists of cavities with conical front ends and cylindrical rear ends; the internal walls of the blackbody cavity shells are coated with coatings of high-emissivity painting; the liquid thermostat is internally provided with the temperature control device, and three grooves which are conical at the front ends and cylindrical at the rear ends are in equal intervals and in the same size; three blackbody cavity shells are respectively arranged in the grooves which are the same with the blackbody cavity shells in shape; the external side of the liquid thermostat is fixedly connected with the external cylindrical surfaces of the cylindrical cavities with three openings; and the standard thermometer is arranged in the liquid thermostat. According to the three-cavity blackbody radiation source for measuring emissivity, the number of the blackbody cavities is increased, and the emissivity of three different samples to be measured can be measured at the same time; the data of the sample to be measured, a standard sample and a radiation source can be timely contrasted. And the blackbody cavities can be detached and are convenient to place samples.

Description

technical field [0001] The invention relates to an emissivity measurement device, in particular to a three-cavity blackbody radiation source used for emissivity measurement. Background technique [0002] Emissivity is one of the important bases for measuring the radiation ability of thermal radiators. Researching and measuring the emissivity of objects has important practical significance for revealing the thermal radiation characteristics of materials, improving radiation heating efficiency and finding new ways to save energy. In the field of national defense, the cognition of the launch rate of missile flame and skin is the key to military early warning, guidance and stealth. The acquisition of target emissivity data is the basis of remote sensing and radiation temperature measurement, which directly determines the measurement uncertainty. [0003] Emissivity is a rather complex parameter, and the temperature, wavelength, surface condition, emission angle, polarization st...

Claims

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Application Information

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IPC IPC(8): G01J5/00G01N21/71
Inventor 孙坚章龙飞赵泉钦陈乐钟绍俊崔志尚
Owner CHINA JILIANG UNIV
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