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A thermodynamic temperature measurement method for nuclear radiation environment

A thermodynamic temperature and measurement method technology, applied in radiation pyrometry, optical radiation measurement, measurement devices, etc., can solve problems such as mechanical and electrical properties change, carbon erosion, inability to adapt to high temperature environment temperature measurement requirements, etc., to reduce difficulties degree of effect

Inactive Publication Date: 2018-12-21
NAT INST OF METROLOGY CHINA
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Problems solved by technology

The currently commonly used K-type thermocouple with good nuclear radiation resistance will not be able to meet the temperature measurement requirements of high-temperature environments. Other existing types of thermometers, such as S-type thermocouples, are easily contaminated by radiation and carbon corrosion, making their Both mechanical and electrical properties change rapidly, and long-term high-carbon corrosion will also cause embrittlement of the radiation protection tube

Method used

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  • A thermodynamic temperature measurement method for nuclear radiation environment
  • A thermodynamic temperature measurement method for nuclear radiation environment
  • A thermodynamic temperature measurement method for nuclear radiation environment

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Embodiment Construction

[0016] In order to facilitate the understanding of the present invention, the embodiments of the present invention will be described below in conjunction with the accompanying drawings. Those skilled in the art should understand that the following description is only for the convenience of explaining the present invention, not as a specific limitation of its scope.

[0017] Statistical average kinetic energy and thermodynamic temperature k of a monatomic ideal gas under thermal equilibrium conditions B The relation of T is:

[0018]

[0019] Among them, v RMS represents the root mean square velocity of an ideal gas molecule with mass m, k B is the Boltzmann constant, and T is the thermodynamic temperature. For an adiabatic ideal monatomic gas system with acoustic microperturbations, the average kinetic energy of monatomic molecules and its ideal gas sound velocity c 0 There are the following relations:

[0020]

[0021] Among them, γ 0 is ideal gas specific heat rat...

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Abstract

The invention relates to a thermodynamic temperature measurement method in a nuclear radiation environment. The thermodynamic temperature measurement method is characterized by comprising the steps of providing a graphite tube having a predetermined length; filling the graphite tube with helium; inserting the graphite tube vertically from the top of a reactor to the bottom of the reactor; and providing an acoustic signal for the graphite tube, calculating the average acoustic velocity of the helium in the graphite tube, and obtaining the corresponding thermodynamic temperature based on the relationship between the average acoustic velocity and temperature of the helium. The invention achieves the application of the acoustic resonance thermodynamic temperature measurement to the temperature measurement in the nuclear radiation environment, and reduces the complexity of the absolute temperature method temperature measurement technology and the difficulty in operation for practical requirements. According to the invention, the acoustic resonance thermodynamic temperature measurement method in the nuclear radiation environment is applicable to nuclear radiation environment thermodynamic temperature measurement and also to systems that require no harsh environmental influence and a stable operation status.

Description

technical field [0001] The invention relates to a temperature measurement method, in particular to a thermodynamic temperature measurement method using acoustic resonance to measure nuclear radiation environment. Background technique [0002] Thermometers can be divided into absolute thermometers and relative thermometers according to their measurement principles. Absolute thermometers are also called thermodynamic thermometers. According to the basic thermodynamic relationship, the thermodynamic temperature is obtained by directly measuring the average kinetic energy of molecules in the heat balance system. The measurement results of the thermometer do not depend on the physical properties of the working medium. The temperature measurement of the relative thermometer does not depend on the basic thermodynamic relationship, but reflects the corresponding relationship between some physical properties and temperature. Therefore, the relative thermometer must be calibrated to o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00
Inventor 张金涛
Owner NAT INST OF METROLOGY CHINA
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