Structural Principles and Features 1 Structural Design The ceramic thick-film pressure transmitter consists of a pressure sensor and a signal processing conversion circuit. According to different design requirements, the two can be made into separate or integrated structures.
The core component of the thick film pressure sensor is a thick film resistor paste (TFR) on a ceramic sheet, which is printed on the Al2O3 ceramic elastomer by screen printing, and then sintered, assembled, and other processes. Because the thick film strain resistance is directly printed on the ceramic elastomer with the TFR slurry, the strain resistance and the ceramic elastomer can be firmly sintered into a whole, which not only meets the requirement of temperature resistance and corrosion resistance, but also avoids the creep caused by the paste. Change and delay. The finished pressure sensor is composed of a pressure sensing element TFR, a sealing gasket, a body seat and the like to form an isolated sealed chamber. When the pressure is measured, the input continues to measure the pressure in the chamber, directly acting on the isolated ceramic sheet, and strain is generated by isolating the ceramic sheet. The electrical resistance of the thick film paste on the surface changes physically. This change is detected by the Wheatstone bridge and the signal is then integrated.
2 working principle The so-called thick film piezoresistive effect is the thickness of the resistance of the thick film resistor paste (TFR) after the stress, the piezoresistive effect.
Round-film pressure sensors, which are now widely used, usually use a "cup" type structure in which a ring-shaped ceramic is fired with a ring-shaped ceramic to form a cup bottom. Since the ceramic sheet is an excellent elastomer, the round cup bottom is a quite ideal circumferentially fixed diaphragm when it is made into a "cup". The equilibrium state of the bridge changes accordingly, and an electrical signal corresponding to the pressure signal to be measured is obtained, thereby realizing the conversion of the pressure signal and the electrical signal.
3 Conclusion Thick-film pressure transmitter uses force-sensitive materials for the excellent elasticity of the ceramic body, so the sensor has good linearity, hysteresis and temperature performance {direct contact with various media without isolation; small size, light weight, shock resistance With the characteristics of impact, easy installation, etc., it can be widely used in gas pressure measurement, chemical water pressure measurement with low corrosion degree, container liquid level measurement, and wind pressure measurement of vibration pipelines.
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