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

Temperature sensor is a kind of common measuring instruments, widely used in multiple industries. Temperature sensor working environment is also very broad, can be in the middle and low and high temperature, and other conditions. Engineering is to introduce the temperature sensor for you today how work under the environment of high temperature of 600 degrees, the following to have a look at it.

project, points out that high temperature sensor is the key practical application in sensor technology and read the signals from 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, when using SiC semiconductor manufacturing high-temperature sensors, read from the data circuits one see the sensor electrode resistance will increase. 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 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 sensor 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. This scheme is put forward, based on the resistance of the diode conversion circuit near the sensor, the 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 sensor and digital temperature sensor