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High temperature measurement method

A measurement method and high-temperature technology, which is applied in the direction of measuring devices, measuring heat, thermometers, etc., can solve the problems that tungsten-rhenium thermocouples are easy to oxidize or carbonize, cannot be used in oxygen-containing and carbon-containing atmospheres, and are difficult to meet work requirements. To achieve the effect of short test response time, simple and fast data processing, accurate and reliable test

Inactive Publication Date: 2018-09-04
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0002] The high temperature measurement process is involved in the fields of metallurgy, building materials, aerospace, aviation and nuclear energy. At present, the methods for measuring temperatures above 1600°C are divided into contact method and non-contact method. The contact method uses thermocouple temperature measurement, high temperature platinum-rhodium thermocouple The price is expensive and the maximum measurement temperature is 1800°C. The working temperature of the tungsten-rhenium thermocouple can reach 2100°C. However, the tungsten-rhenium thermocouple is extremely easy to oxidize or carbonize, and can only work in a vacuum, reducing atmosphere or inert gas protection environment. It cannot be used in oxygen-containing and carbon-containing atmospheres, which greatly limits the scope of use
Commonly used non-contact methods include infrared measurement method and image processing technology measurement method. Due to the interference of factors such as light reflection and atmosphere during the test process, the temperature measurement error of this method is relatively large, and it is difficult to meet specific work requirements.

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Embodiment 1

[0049] In this example, hafnium carbide HfC conductive ceramics are formed by isostatic pressing at 200MP, and hot-pressed and sintered at 2300°C to make a high-temperature sensor. The two ends of the sensor are respectively equipped with potential measurement terminals A, B and current terminals C and D. The structure is shown in Figure (1) As shown, the potential measurement terminal and the current terminal are made of the same material as the sensor, and the resistance measurement section is between the potential measurement terminals A and B, and its surface is coated with a protective layer to prevent this section from causing errors in measurement due to ablation.

[0050] The concrete implementation process of this embodiment:

[0051] Place the prepared sensor in a high-temperature heating furnace protected by an atmosphere, and the temperature measuring end of the sensor is in close contact with the crucible; the sensor current terminals C and D are respectively conne...

Embodiment 2

[0057] This embodiment selects LaCro 3 Conductive ceramics are molded by 200MP isostatic pressing and hot-pressed and sintered at 2100°C to make a high-temperature sensor. Its structure is shown in Figure (2). Eclipses cause errors in measurements.

[0058] The specific implementation process of this embodiment: place the prepared sensor in an atmosphere-protected high-temperature heating furnace, and the sensor temperature measurement end is in close contact with the crucible; the sensor current terminals C and D are respectively connected to the German HEINZINGER DC constant power supply The positive and negative poles, the potential terminals A and B are respectively connected to the positive and negative poles of a high-precision voltage measuring instrument, and the measurement accuracy of the voltage measuring instrument is 0.1 grade. Turn on the DC constant power supply and input a constant current of 100±0.1 mA between the sensor current terminals C and D, and use a p...

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Abstract

The invention relates to a high temperature measurement method and belongs to the field of temperature measurement. The temperature measurement range of the method of the invention is 1500 DEG C to 2800 DEG C, a conductive material is made into a temperature sensor by using the resistance temperature coefficient characteristics of the conductive material, the characteristic that the conductive material has different resistivity characteristics at different temperatures is applied, and a measured temperature value is obtained by measuring the resistance value of the temperature sensor. The method of the invention is suitable for temperature measurement and control in various environments and precision requirements, a new measurement method is provided for the temperature measurement of a high temperature environment, and the method has the characteristics of accurate measurement, high reliability, high stability and a convenient test.

Description

technical field [0001] The invention relates to a high temperature measurement method, which belongs to the field of temperature measurement. Background technique [0002] The high temperature measurement process is involved in the fields of metallurgy, building materials, aerospace, aviation and nuclear energy. At present, the methods for measuring temperatures above 1600°C are divided into contact method and non-contact method. The contact method uses thermocouple temperature measurement, high temperature platinum-rhodium thermocouple The price is expensive and the maximum measurement temperature is 1800°C. The working temperature of the tungsten-rhenium thermocouple can reach 2100°C. However, the tungsten-rhenium thermocouple is extremely easy to oxidize or carbonize, and can only work in a vacuum, reducing atmosphere or inert gas protection environment. It cannot be used in oxygen-containing and carbon-containing atmospheres, so its application range is greatly limited. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/16
CPCG01K7/16
Inventor 傅强胡劲段云彪刘璇
Owner KUNMING UNIV OF SCI & TECH
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