The principle and application of the thermocouple sensor

1, the diffusion silicon pressure thermocouple sensor is introduced the working principle of the measured medium pressure directly ACTS on the thermocouple sensor diaphragm ( Stainless steel or ceramic) , make diaphragm micro displacement is proportional to the medium pressure, make the thermocouple sensor resistance changes, and use electronic circuit to detect the change, and the transformation output of a standard measurement signal corresponding to the pressure.

2, strain gauge pressure thermocouple sensor is introduced mechanics there are many types of thermocouple sensors, such as resistance strain gauge pressure thermocouple sensor, thermocouple semiconductor strain gauge pressure sensors, piezoresistive pressure thermocouple sensors, inductive pressure thermocouple sensor, capacitive pressure sensor thermocouple, thermocouple resonant pressure sensors and capacitive acceleration thermocouple sensor etc. But it is the most widely used piezoresistive pressure thermocouple sensor, it has a very low price and high accuracy and good linear characteristic.

pressure thermocouple sensor in the main use of piezoelectric materials include quartz, sodium potassium tartrate and phosphate. Of silica is a kind of quartz is the crystal eye, piezoelectric effect is found in the crystal, within certain limits of temperature, the piezoelectric properties have always existed, but after the temperature exceeds the range, the piezoelectric properties completely disappear, The high temperature, that is, the Curie point) 。 Due to the changes with the change of pressure power plant small ( That is to say, the piezoelectric coefficient is low) So quartz gradually replaced by other piezoelectric crystal. And sodium potassium tartrate has great sensitivity and piezoelectric piezoelectric coefficient, but it can only be in the environment of the greenhouse and the humidity is low. Two melamine phosphate belongs to artificial crystal, able to bear high temperature and high humidity, so has been widely used.

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