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    The working principle of displacement sensor
    2016-08-25 09:20
    Potentiometer displacement sensor, displacement sensor 
    Displacement sensor 
    It through the potentiometer elements will be converted to mechanical displacement and a linear or arbitrary function relationship of the resistance or voltage output. Ordinary linear potentiometer and circular potentiometer can be used as a linear displacement and angular displacement sensors, respectively. However, it is designed for measuring the displacement of potentiometer, requires changes in displacement and has a certain relationship between the resistance. Potentiometer displacement sensor of movable brush connected to the object under test.
    Potentiometer mobile end resistance change with the displacement of the object. Resistance variation reflects the value of displacement, increase or decrease of resistance indicates the direction of the displacement. Usually on the potentiometer is connected to the power supply voltage, resistance to change is converted to a voltage output. Wire wound resistor due to its brush while moving resistance to turn resistance change for ladder, its output characteristic also stepped in. If this kind of displacement sensor is used as the feedback element displacement in the servo system, big step voltage will cause the system oscillations. So in the potential of making should try to reduce the resistance of each turn. Another major disadvantage of the potentiometer sensor is easy to wear. Its advantages are: simple structure, the output signal is big, easy to use, low price.
    Magnetostrictive displacement sensor by non-contact measurement and control technology to accurately detect the activities of the circular of the absolute position to measure the actual displacement value of the tested products; The sensor of high accuracy and high reliability has been widely applied to thousands of actual cases.
    Because as a circular and determine the location of the activity and sensitive element and has no direct contact, displacement sensor 
    Displacement sensor 
    So the sensor can be used in harsh industrial environments, susceptible to oily be soiled, the influence of the solution, dust or other contamination, IP protection grade above IP67. In addition, the sensor adopts the advanced high-tech materials and electronic processing technology, thus it can be used in high temperature, high pressure and high vibration environment. Sensor output signal for the absolute displacement value, even if the power supply interruption, again, the data is not lost, more do not need to return to zero. Due to the sensitive element is in contact, even if the repeated test, also won't cause any wear and tear of sensor, can greatly improve the reliability of test and service life.
    Magnetostrictive displacement sensor, is to use magnetostrictive principle, through two different magnetic fields intersect to create a strain of the pulse signal to accurately measure the position. The measuring element is a waveguide, the waveguide tube sensor made of special magnetostrictive materials. Measurement process is generated by the sensor of electronic indoor electric current pulse, the electric current pulse transmission on the waveguide tube, which produces a circular magnetic field outside the waveguide, when the magnetic field and set on the waveguide as the position changes of activity of the circular intersection of a magnetic field, due to the magnetostriction effect, the waveguide tube will produce a strain mechanical wave pulse signal, the strain of mechanical wave pulse signal with fixed sound transmission speed, and soon was detected by electronic chamber.
    As a result of this strain mechanical wave pulse signal transmission time and activities in the waveguide tube circular and proportional to the distance between the electronic chamber, displacement sensor 
    Displacement sensor 
    By measuring the time, you can determine the distance and height accurately. Due to the absolute value of the output signal is a real, rather than a proportion or amplification of signal processing, so there is no signal drift or value, without heavy standard on a regular basis.
    Magnetostrictive displacement sensor is based on the principle of the magnetostrictive manufacturing high precision, long stroke absolute position measurement of displacement sensor. It adopts non-contact measurement method, by measuring the activities of the magnetic ring and there is no direct contact with the sensor itself, not by friction, wear, and thus its long service life, environmental adaptability is strong, high reliability, good safety and convenience of system automation work, even in harsh industrial environments, also can work normally. In addition, it also can bear high temperature and high pressure and strong vibration, has been widely used in the mechanical displacement measurement and control.
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