he non-contact displacement sensor, the displacement sensor is a revolutionary improvement potential based on the technology, compared to the use of the past complex, using magnetostrictive displacement sensor technology, both in the interface and performance, has greatly improved. Do you know the application technology of the displacement sensor of magnetostrictive technology? First of all, we must understand the displacement sensor is also known as linear sensor, the displacement of the sensor into electricity. The displacement sensor is a linear device belonging to the metal induction sensor, is the role of the measured physical quantity is converted to electricity which is divided into a type of inductance displacement sensor, capacitive displacement sensor, photoelectric sensors, ultrasonic sensors, Holzer type displacement sensor.
In this conversion process, there are many physical quantities (such as pressure, flow, acceleration, etc.) often need to be converted into a displacement, and then the displacement into electricity. So displacement sensor is an important basic sensor. In the process of production, the displacement measurement is generally divided into two kinds: physical size and mechanical displacement. Mechanical displacement includes linear displacement and angular displacement. According to the different forms of the measured variables, the displacement sensor can be divided into two types: analog and digital. Simulation can also be divided into physical type (such as self power generation) and structural type two. The commonly used displacement sensor to simulate the structure types, including potentiometer displacement sensor, inductive displacement sensor (see inductive sensor), synchro, capacitive displacement sensor (see capacitive sensor), eddy current displacement sensor (see eddy current sensor), Holzer type displacement sensor etc.. One of the most important advantages of the digital displacement sensor is that it is easy to send the signal directly to the computer system (see digital sensor). This sensor is developing rapidly, increasingly wide range of applications (see inductosyn, encoder, grating, magnetic grid sensor).
The utility model relates to a potentiometer type displacement sensor, which converts the mechanical displacement into a linear or arbitrary function resistance or voltage output through a potentiometer element. Ordinary linear potentiometer and circular potentiometer can be used as a linear displacement and angular displacement sensor. However, in order to realize the purpose of measuring displacement, it is necessary to have a definite relation between the displacement and the resistance. The movable brush of potentiometer displacement sensor in Figure 1 is connected with the measured object. The displacement of the object causes the change of the resistance of the potentiometer. The variation of resistance reflects the magnitude of displacement, increase or decrease the resistance that the displacement in the direction of. Usually on the potentiometer to the power supply voltage in order to change the resistance to voltage output. Because of the change of the resistance of the wire wound potentiometer with the turn resistance as the step, the output characteristic of the wire wound potentiometer is also a ladder shape. If the displacement sensor is used as the displacement feedback element in the servo system, the excessive step voltage will cause the system oscillation. Therefore, the resistance of each turn should be reduced as far as possible. Another major disadvantage of potentiometer sensor is easy to wear. The utility model has the advantages of simple structure, large output signal, convenient use and low cost.
through the measurement and control technique of non-contact precise absolute position detection to measure the magnetic activity detected the actual displacement value of the products of magnetostrictive displacement sensor; the sensor with high precision and high reliability has been widely used in the actual case in the tens of thousands.
Due to the direct contact activities determine the position of the magnetic loop and no sensitive element, so the sensor can be used in harsh industrial environments, not easily influenced by grease, dust or other pollution solution, the IP protection level in more than IP67. In addition, the sensor uses high-tech materials and advanced electronic processing technology, so it can be applied in the environment of high temperature, high pressure and high oscillation. The output signal of the sensor is the absolute displacement value, even if the power supply is interrupted and reconnected, the data will not be lost. Because the sensitive element is non-contact, even if the repeated detection, it will not cause any wear of the sensor, can greatly improve the reliability of detection and service life.
Magnetostrictive displacement sensor, is the use of magnetostrictive principle, through the intersection of two different magnetic fields to generate a strain pulse signal to accurately measure the position of the. The measuring element is a waveguide, which is made of special magnetostrictive material. The measurement process is generated by the electronic indoor sensor pulse current, the current pulse propagation in the waveguide, resulting in a circumferential magnetic field in the waveguide, and the magnetic field generated when the intersection set as the position changes in the waveguide activity on the magnetic field, due to the magnetostrictive effect, will produce a waveguide mechanical strain pulse tube, the mechanical strain wave pulse signal transmission at a fixed speed of sound, and soon to be detected by electronic room. Between the waveguide transmission time and magnetic and electronic activity room from the mechanical strain is proportional to the pulse signal, by measuring the time, can accurately determine the height of the distance. Since the output signal is a true absolute value, rather than a proportional or amplified signal, there is no signal drift or change in the value of the situation, even without the need for periodic calibration.
Magnetostrictive displacement sensor is a kind of displacement sensor with high precision and long stroke absolute position. It adopts non-contact measurement methods, due to the direct contact activities for the measurement of magnetic sensor itself and no, not to be friction, wear, and long service life, strong ability to adapt to the environment, high reliability, good safety, convenient for system automation work, even in harsh industrial environment, it can work normally. In addition, it can withstand high temperature, high pressure and strong vibration, has been widely used in mechanical displacement measurement, control.