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Coaxial thermocouple sensor insulativity detection method

A technology of thermocouple sensor and detection method, which is applied in the field of test and measurement, and can solve the problems of small sensor size and difficulty in insulating layer detection

Pending Publication Date: 2021-03-12
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Description
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Problems solved by technology

Due to the small size of the sensor, the insulating layer is sandwiched between the inner and outer electrodes, which brings great difficulties to the detection of the insulating layer

Method used

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  • Coaxial thermocouple sensor insulativity detection method
  • Coaxial thermocouple sensor insulativity detection method
  • Coaxial thermocouple sensor insulativity detection method

Examples

Experimental program
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Embodiment

[0025] Such as figure 1 As shown, the coaxial thermocouple sensor is composed of an inner electrode, an insulating layer, an outer electrode and a wire. The inner electrode is cylindrical, the outer electrode is a round tube, and there is an insulating layer between the inner / outer electrodes.

[0026] First, use the grinding wheel on the metal grinder to roughly grind the end face of the sensor to remove the large-sized burrs generated during the processing of the sensor. The speed of the metal grinder is 500 rpm, and the end face of the sensor is parallel to the surface of the grinding wheel of the grinder. The cold water cools the surface of the grinding wheel and the end face of the sensor. After the end face of the sensor is smooth and bright, it begins to enter the fine grinding stage.

[0027] Use the nylon cloth wheel on the metal grinder to finely grind the end face of the sensor. The speed of the metal grinder is 500 rpm. Continuously spray cold water on the surface ...

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Abstract

The invention relates to a coaxial thermocouple sensor insulativity detection method comprising the following steps: 1), roughly polishing the end face of a coaxial thermocouple sensor to remove large-size burrs; 2), finely polishing the end surface of the coaxial thermocouple sensor to clearly distinguish the contours of an inner electrode, an insulating layer and an outer electrode; 3), photographing the end surface of the coaxial thermocouple sensor, extracting the contour of the insulating layer of the coaxial thermocouple sensor, and measuring the thickness and uniformity of the insulating layer of the coaxial thermocouple sensor; and 4), measuring the resistance value between two wires of the coaxial thermocouple sensor by using a universal meter, and judging the insulativity of theinner electrode and the outer electrode of the coaxial thermocouple sensor. The method is used for detecting the insulativity of the inner electrode and the outer electrode, the thickness of the insulating layer and the thickness distribution uniformity of the insulating layer aiming at the coaxial thermocouple sensor, and has the advantages of simple principle, convenience in operation and quickness in data processing.

Description

technical field [0001] The invention relates to a method for detecting the insulation of a coaxial thermocouple sensor, which belongs to the technical field of test and measurement. Background technique [0002] Coaxial thermocouple sensors have the advantages of small size, fast response and high measurement accuracy, and are widely used in temperature and heat measurement experiments in hypersonic wind tunnels. The insulation layer parameters of the coaxial thermocouple sensor directly affect the response performance of the sensor, so it is necessary to detect the insulation performance of the sensor, including the thickness of the sensor's insulation layer, the uniformity of the insulation layer distribution, and the insulation resistance. Due to the small size of the sensor, the insulating layer is sandwiched between the inner and outer electrodes, which brings great difficulties to the detection of the insulating layer. Contents of the invention [0003] The technica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N21/95G01B11/06G01R27/02G01R31/52
CPCG01N1/32G01N21/95G01B11/0616G01R27/025G01R31/52
Inventor 沙心国陈星师军李夏辉熊春芳霸艳春张建乡
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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