The principle and application of ceramic pressure sensor

Ceramic is a recognized high flexibility, corrosion resistance, wear resistance, resistance to impact and vibration of the material. Thermal stability properties of ceramics and its thick film resistance temperature range up to - can make it work 40 ~ 135 ℃, and with high precision, high stability of the measurement. Electrical insulation level & gt; 2 kv, the output signal is strong, long-term stability is good. High characteristics, low price of ceramic sensors will be the development direction of pressure sensor, in Europe and the United States has a tendency to fully replace other kinds of sensors, also more and more users in China use ceramic sensors instead of diffused silicon pressure sensor.

corrosion resistant ceramic pressure sensor no liquid transfer, direct acting pressure in front of the ceramic membrane surface, make the diaphragm produces tiny deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a wheatstone bridge, Bridge) , due to the piezoresistive effect of pressure-sensitive resistance, make the bridge produces a is proportional to the pressure of the highly linear, and the excitation voltage is proportional to the voltage signal and standard signal according to the different calibration of pressure range for 20 to 30 mVV is 33, etc. , can be compatible and strain sensor. Through laser calibration, temperature sensor has high stability and time stability of the sensor with temperature compensation 0 ~ 70 ℃, and can direct contact and the vast majority of media.

industrial pressure sensor

there are many types of mechanical sensors, such as resistance strain weighing sensor, semiconductor strain gauge pressure sensors, piezoresistive pressure sensor, inductance type pressure sensors and capacitive pressure sensor, resonant pressure sensors and capacitive acceleration sensor and so on. But the most widely used is a piezoresistive pressure sensor, it has a very low price and high accuracy and good linear characteristic. Here we mainly introduce this kind of sensor.

in the decompression resistance type force sensor, we first meet resistance strain slice of this element. Resistance strain gauge is a thing to be tested on the strain change into an electrical signal sensitive device. It is one of the main part of resistance strain sensor. Resistance strain gauge used mostly metal resistance strain gauge and semiconductor strain gauge. Metal resistance strain gauge and filamentous strain gauge and metal foil strain gauge. Usually will strain gauge through the special adhesive agent and adhesive on the produce mechanical strain matrix, when the matrix stress when the stress changes, the resistance strain gauge also together to produce deformation, which changes the resistance strain gauge, to make the change on the resistance of voltage. This strain gauge in force when the resistance changes usually smaller, general this kind of strain gauge of strain bridge, and through the subsequent instrumentation amplifier amplification, and then transfer to a processing circuit ( Usually the AD conversion and CPU) Displays or actuators.