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 instrument sensor principle, it is able to realize the advantages of non-contact distance measurement speed, high precision, range, strong anti-light, electrical interference ability. 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. Hall voltage changes with changes in magnetic field strength, the stronger the magnetic field, the higher the voltage sensor is what is, the weaker the magnetic field sensor, the lower the voltage. Hall voltage value is small, typically only a few millivolts, but amplified by the integrated circuit, which can make the output voltage is amplified to a sufficiently strong signal. Ruo Shi Hall effect sensor ICs offer from sensing the need to use mechanical means to change the magnetic field strength. The method is shown below with a rotating impeller flux as a control switch, when the impeller blades in the air gap between the magnet and the Hall IC, the magnetic field deviation integrated on-chip, the Hall voltage disappears. Thus, the change in output voltage of the Hall IC, the impeller drive shaft can be shown to a position, using this principle, can be an integrated circuit chip with the Hall effect sensor ignition timing. Hall-effect sensor is a passive sensor, it must have external power supply to work, a feature that enables it to detect low speed functioning. Sensor principle | Sensors | 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!