Laser high directivity, high color and high brightness and other characteristics can be achieved without contact distance measurement. Laser sensors commonly used in length (ZLS-Px), distance (LDM4x), vibration (ZLDS10X), speed (LDM30x), orientation and other physical measurements of high quality filter sensors can be used for detection and monitoring of atmospheric pollutants. Hall sensor is a magnetic field sensor based on the Hall effect produced, widely used in industrial automation technology, detection technology and information processing. Hall effect is the basic method of Semiconductor Materials. Hall effect experimentally determined by Hall coefficient, important parameters can be determined conductivity type semiconductor material, the carrier concentration and the carrier mobility and the like. Hall sensors into linear Hall sensor and Hall sensor switch two kinds. A linear Hall sensor consists of a Hall element, linear amplifier and emitter follower composition, it outputs analog. 2, the switching regulator by the Hall sensor, the Hall element, a differential amplifier, Schmitt trigger and output stage filter sensor, which outputs digital. Static characteristics of the sensor means between the static input signal, the output of the sensor to the input amount of a correlation. Because then both input and output filters and time-independent sensor supply, so the relationship between them, namely the static characteristics of the sensor can be used without a time variable algebraic equations, or to enter the amount for the horizontal, to its characteristic curve corresponds to the output as ordinate and drawn described. The main parameters characterizing sensor static characteristics are: linearity, sensitivity, hysteresis, repeatability, drift. Filter sensor supply _ Xinfeng (certified) _ Xuchang filter sensor sensing provided by Xinxiang City Xinfeng purification technology Limited. Xinxiang City Xinfeng purification Sensing Technology Co., Ltd. (www.xfcgq.com) is an industry leader in Henan Xinxiang, sensors, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Xinfeng leadership with the staff warmly welcome all inquiries negotiations to create a better future Xinfeng.