Thermocouple temperature sensor in high temperature of 600 degrees environment how to work

Thermocouple temperature sensor is a kind of common measuring instruments, widely used in multiple industries. Thermocouple temperature sensor working environment is also very broad, can be in the middle and low and high temperature, and other conditions. Engineering today is to introduce thermocouple temperature sensor for everybody how to work in high temperature of 600 degrees environment, specific look at the below.

project, points out that practical application of the high-temperature thermocouple sensor is the key to own thermocouple sensor technology and read the signal from thermocouple sensor technology. This is because, even at high temperatures ( 500～600℃） Environmental measuring temperature and pressure, if read data circuit can not work, cannot use the data. In general, with SiC semiconductor manufacturing high-temperature thermocouple sensor, read from the data circuit side see thermocouple sensor electrode resistance will rise. If put the readout circuit in the high temperature environment, and use the long wire, the resistance of the wire will influence the signal of thermocouple sensor, lead to accurate measurement.

engineering two schemes are introduced. One is to use mechanical solutions of frequency converter, is based on MEMS ( Microelectronics mechanical systems) Processing technology made of tiny mechanical switch to constitute the inverter circuit. Because of this circuit is not dependent on the characteristics of semiconductor, so also can work under 500 ℃. This project is the United States at case western reserve university ( CaseWesternReserveUniversity) Published. While this circuit can also be accomplished by SiC transistor, but at present it is difficult to use than silicon wafer ( Integrated circuit base board) Defects of SiC wafers low-cost manufacturing transistors.

another solution is to use SiC diode rectifier bridge, keep the thermocouple sensor of resistance. Although it is difficult to use SiC wafers low-cost manufacturing transistor, but the SiC for power semiconductor diode has been achieved, invested in many USES and practical. The plan is put forward, based on the resistance of the diode conversion circuit near thermocouple sensor, signal can be extended by coaxial cable. The plan is published at Northeastern University in Japan. In addition, based on the resistance of the diode rectifier bridge conversion technology has been published in 40 years ago.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor