Piezoresistive sensor device is based on the piezoresistive effect in a semiconductor material on a substrate of semiconductor material and made by a diffusion resistor. In which the substrate can be measured directly as the sensing element, the diffusion resistance in the substrate connected in a bridge form. When the substrate is deformed by external force sensor selection filters, each resistance value will change, the bridge will have a corresponding unbalanced output. Piezoresistive sensors used as a substrate (or membrane) main material for silicon and germanium chip diesel filter sensor wafers for sensitive material made of silicon piezoresistive sensors more and more people's attention filter clear water level sensors, especially in solid state piezoresistive sensors measure the pressure and velocity of the most common. RTD sensor classification: 1, NTC thermistor sensors: Sensors such as a negative temperature coefficient sensors, that sensor resistance decreases with increasing temperature. 2, PTC thermistor sensor: such a sensor is a positive temperature coefficient sensor, i.e. the sensor resistance increases with increasing temperature. The use of laser technology to measure sensor. It consists of a laser, a laser detector and the measurement circuit. The laser sensor is a new measuring instruments, it is able to realize the advantages of non-contact distance measurement speed, high precision, large-scale filter sensors, anti-light, electrical interference ability and so on. When the laser sensor working, first aim the laser emitting diode emits a laser pulse. After the target reflected laser scattering in all directions. Part scattered light returns to the sensor receiver, after being imaged onto a receiving optical system avalanche photodiode. Avalanche photodiode is an optical sensor having an internal amplification function, so that it can detect very weak optical signal, and converts it into a corresponding electrical signal. Filter sensor type, Sichuan filter sensor, Xinfeng Xinfeng sensor provided by Xinxiang purification technology Limited. Xinxiang City Xinfeng purification Sensing Technology Co., Ltd. (www.xfcgq.com) strong, credible, Xinxiang in Henan sensor industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement will lead Xinfeng innovative ideas into the brilliant and you work for a better future!