Increasingly widespread application - Transducer！

Increasingly widespread application - Transducer



Displacement is the amount and location of objects in motion the process of moving related range displacement sensor displacement measurement involved are quite extensive. Small displacement usually strain, inductive, differential transformer, eddy current, Hall sensors to detect large displacement of conventional induction synchronous, grating, capacitive, magnetic grid and other sensing technology to measure. Wherein the grating sensor are easy due to digital, high accuracy (the highest resolution can reach nanometer), anti-interference ability, no one reading error, easy to install, use and reliable, in machining, instrumentation and other industries increasingly wide range of applications.

Potentiometer displacement sensors, displacement sensors through potentiometer element with the mechanical displacement into a linear or any function of resistance or voltage output. Ordinary linear and circular potentiometer potentiometer can be used separately and linear displacement angular displacement sensor. However, for the purpose of measuring the displacement of the potentiometer is designed, is required between the displacement and the resistance change is determined to have a relationship. Potentiometer displacement sensor movable brush and the object is connected.

Displacement of the object causing the resistance variable potentiometer mobile side. The amount of resistance change reflects the magnitude of the displacement, the resistance increases or decreases it indicates the direction of displacement. Usually on the potentiometer through to the supply voltage to the resistance change is converted to a voltage output. Wirewound potentiometers because of its resistance to move the brush turns ladder resistance changes, the output characteristics also found stepped. If such a displacement sensor is used as a feedback element in displacement servo system is too large step voltage can cause system oscillation. Therefore, the potential production should be to minimize the resistance value of each turn. Another major disadvantage of potentiometer sensors are easy to wear. Its advantages are: simple structure, the output signal is large, easy to use and inexpensive.

Magnetostrictive displacement sensor to accurately detect the magnetic activity through non-contact measurement and control technology to measure the absolute position of the detected value of the actual displacement of the product; high accuracy and reliability of the sensor has been widely used in tens of thousands the actual case.

Because as a magnet to determine the location of activities and there is no direct contact with the sensor, a displacement sensor so that the sensor can be used in extremely harsh industrial environments, easily affected by oil, solution, dust or other contamination, IP protection class IP67 at least. In addition, the sensor uses high-tech materials and advanced electronic processing technology, which it can use in high temperature, high pressure and high oscillating environment. Absolute displacement sensor output signal value, even if the power supply is interrupted, reconnection, data is not lost, no need to re-zero. Since the non-contact sensor, even if repeated testing, nor will it cause any wear sensor, can greatly improve the detection reliability and service life.

Magnetostrictive displacement sensor, is the use of magnetostrictive, accurately measuring the position of intersection of the magnetic field generated by two different strain of a pulse signal. The measuring element is a waveguide, the waveguide sensing element by special magnetostrictive material. The measurement process is generated by the electronic room sensor current pulses, the current pulses in the waveguide, thereby generating a circumferential magnetic field in the waveguide tube, when the magnetic field of the magnetic field and set in the waveguide as a change in position of activity magnetic ring generated intersection when, due to magnetostrictive, will produce a mechanical strain wave pulse signal within the waveguide, the mechanical strain wave pulse signal at a fixed speed of sound transmission, and soon electronic compartment detected.

Since the distance between the mechanical strain wave pulse signal within the waveguide transmission time and activity between the magnetic and electronic compartment is proportional to the displacement sensor by measuring the time, it can be highly accurately determine the distance. Since the output signal is a true absolute value, and the signal is not proportional or enlargement process, where the signal drift or change the value so there is no more need for periodic re-marked.

Magnetostrictive displacement sensor is based on the magnetostrictive principle manufacturing high-precision, long stroke absolute position measurement of displacement sensor. It uses non-contact measurement, since the measurement of magnetic activity and has no direct contact with the sensor itself, and will not be friction, wear, and thus its long service life, environmental adaptability, high reliability, security, and easy automation system, even in harsh industrial environments, can work. Additionally, it can withstand high temperature, high pressure and strong vibration, it has been widely used in the mechanical displacement measurement, control.

Linear displacement sensors:

Linear displacement sensor function that converts electrical signals into mechanical linear displacement amount. To achieve this effect the displacement sensor, typically a variable resistance slide set-in fixed position sensors to measure different resistance by displacement in the slide rail. Sensors connected to the steady-state DC voltage rails, allowed to flow through a small micro-amps of current, voltage and slide between the beginning, the length is proportional to the movement of the slide. The sensor is used for rail divider minimizes the total resistance accuracy requirements, because the change in resistance caused by temperature changes will not affect the measurement results.

Angular displacement sensor:

Angular displacement sensor is applied to deal with the obstacles: use angle sensor to control your wheels can indirectly discover obstacles. Principle is very simple: If you operate a motor angle sensor configuration and the gear does not turn, that your machine has been an obstacle to the blocked. This technique is very simple to use, and very effective; the only requirement is that the movement of the wheels can slip on the floor (or slip too many times), otherwise you will not be able to detect obstacles. A idler gear connected to the motor to avoid this problem, the wheel is not driven by a motor driven it but by the movement of the device: the drive wheel during rotation, if the idler wheel stops, indicating that the obstacles you encounter .

Hall displacement sensors:

Its measurement principle is to keep the Hall element (see magnetic semiconductor element) excitation current is constant, and moves in a uniform magnetic field gradient is proportional to the displacement of the mobile Hall of potential output. Magnetic field gradient, the higher sensitivity; more uniform gradient, the potential relationship between the Hall and the displacement of more close to linear. Magnetic system in Figure 2 are the three generating gradient magnetic fields: the linear range of a system of narrow, displacement Z = 0, the Hall potential ≠ 0; b system <2 mm with good linearity when Z, Z = 0, the Hall potential = 0; c high sensitivity system, the measurement range of less than 1 mm. Figure N, S, respectively, positive and negative poles. Hall displacement sensor inertia small, high frequency response, reliable, long life, so commonly used in various non-electricity is converted into displacement measured after the occasion.

Optical displacement sensors:

To measure displacement or geometry objects blocking it much flux based on the measured object. Characterized by a non-contact measurement and continuous measurement. Optical displacement sensors commonly used in the continuous measurement of the diameter of the wire or as an edge position sensor strip edge position control systems.

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