Multi-function sensor and heat current and temperature measuring method under high temperature

Abstract

The invention discloses a multi-function sensor and a heat current and temperature measuring method under high temperature, wherein the multi-function sensor comprises a shell and a heat current measuring head, the heat current measuring head is arranged on the shell and comprises a heat current probe and a heat sink, the heat sink and the heat current probe are connected and holded in the shell to form a thermoelectric couple with the heat current probe, a cooling device used for cooling the heat current measuring head and another thermoelectric couple used for measuring the temperature of the heat sink are also arranged in the shell, the two thermoelectric couples are connected with a surveymeter, and the detection of heat current and temperature is realized by measuring the voltage signal of the two thermoelectric couples. In the measuring method disclosed by the invention, a mathematical model is built to derive and obtain high temperature to be measured by measuring low temperature. The multi-function sensor of the invention can measure heat current and temperature in high temperature environment, overcomes the problem that temperature can not be measured under high temperature environment when the original thermoelectric couple is more than 2000K; not only can the heat current be measured, but also the thermoelectric couple can be ensured to work under high temperature environment, thus the temperature is effectively measured.

Description

technical field [0001] The invention relates to a device and method for simultaneously measuring wall heat flow and temperature. Background technique [0002] At present, the heat flow measurement methods mainly include thin-film thermocouples, Smith-type heat flow sensors, and the like. Thin-film thermocouples have a short response time and are suitable for measuring instantaneous heat conduction processes, but the temperature range they can measure is limited, and they are easy to burn out at high temperatures. The Smith-type heat flow sensor has a strong signal and can withstand high temperatures, but the response time is long, and the manufacturing process is complicated. It needs to be plated with copper and constantan circuits on the ceramic board, and the equipment is relatively expensive. Thermocouples are usually used for temperature measurement, but the operating temperature range of thermocouples is usually below 1300K. In higher temperature environments, thermoc...

AI Technical Summary

Problems solved by technology

Thin film thermocouple has a short response time and is suitable for measuring instantaneous heat conduction process, but the temperature range it can measure is limited, and it is easy to burn out at high temperature

The Smith-type heat flow sensor has a strong signal and can withstand high temperatures, but the response time is long, and the manufacturing process is complicated. It needs to be plated with copper and constantan circuits on the ceramic board, and the equipment is relatively expensive.

Thermocouples are usually used for temperature measurement, but the operating temperature range of thermocouples is usually below 1300K. In higher temperature environments, thermocouples cannot survive

For the scramjet engine of hypersonic aircraft, the air flow environment in the combustion chamber is very harsh, the temperature is usually above 2000K, and the heat flow reaches 1MW / m 2 , the thermocouple is easily damaged in this environment, and the heat flow and temperature of the wall cannot be measured

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