What types of displacement sensors are there? What are the characteristics of various types of displacement sensors?

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What types of displacement sensors are there? What are the characteristics of various types of displacement sensors? [Copy link]

1. Displacement sensor, also known as linear sensor, is a linear device belonging to metal induction. The function of the sensor is to convert various measured physical quantities into electrical quantities. In the production process, displacement measurement is generally divided into measuring physical dimensions and mechanical displacement. According to the different forms of change of the measured variables, angle, linear position sensor displacement sensors can be divided into analog and digital types. Analog types can be divided into physical and structural types.
2. Most commonly used displacement sensors are analog structural types, including electric displacement sensors, inductive displacement sensors, synchro, capacitive displacement sensors, eddy current displacement sensors, Hall displacement sensors, etc. An important advantage of digital displacement sensors is that it is easy to send signals directly to computer systems. This sensor has developed rapidly and is widely used.

3. Among displacement sensors, grating sensors have been increasingly widely used in machine tool processing, testing instrumentation and other industries due to their convenient digitization, high precision (the current highest resolution can reach nanometers), strong anti-interference ability of audio sensors, no artificial reading errors, easy installation, and reliable use.

Types of displacement sensors:

1. Displacement sensor is a device that converts the motion displacement of an object into a measurable electrical quantity. It is usually used to convert physical quantities such as displacement, position, deformation, vibration, and size into electrical quantities that are easy to quantitatively detect, transmit, and process information.

2. Potentiometer displacement sensor: The mechanical displacement is converted into a linear or any functional resistance or voltage output through the potentiometer element. Ordinary linear potentiometers and circular potentiometers can be used as linear displacement and angular displacement sensors respectively. However, the potentiometer designed to measure displacement requires a definite relationship between displacement change and resistance change. The movable brush of the potentiometer displacement sensor is connected to the object to be measured.

3. The displacement of the object causes the resistance of the moving end of the potentiometer to change. The change in resistance value reflects the displacement value, and the increase or decrease in the resistance value of the motion sensor indicates the direction of displacement. The power supply voltage is usually converted into a voltage output through a potentiometer.

4. The magnetostrictive displacement sensor accurately detects the absolute position of the active magnetic ring through internal non-contact measurement and control technology, and measures the actual displacement value of the detected product. The position is accurately measured using the magnetostrictive principle, and a strain pulse signal is generated by the intersection of two different magnetic fields. The measuring element is a waveguide made of special magnetostrictive material.

5. Magnetostrictive displacement sensor is a displacement sensor with high precision and long stroke absolute position measurement manufactured according to the principle of magnetostriction. It adopts internal non-contact measurement method. Since there is no direct contact between the measuring magnetic ring and the sensor itself, there is no friction or wear. It has a long service life, strong environmental adaptability, high reliability, good safety, and is easy to work in system automation. It can work normally even in harsh industrial environments (such as oil ulcers, dust or other pollution).

Features of displacement sensor:

1. The function of a linear displacement sensor is to convert a linear mechanical displacement into an electrical signal. To achieve this effect, a variable resistor slide is usually positioned on the fixed part of the sensor, and different resistance values are measured by the displacement of the slider on the slide.

2. The sensor rail is connected to a stable DC voltage, allowing a small current of microamperes to flow. The voltage between the slide and the start is proportional to the length of the slide traveled. Using the sensor as a voltage divider minimizes the accuracy of the total resistance of the rail, because the resistance changes caused by temperature changes will not affect the measurement results.

3. Angle displacement sensor for obstacle handling: Use angle sensor to control the wheel to indirectly find obstacles. The principle is simple: if the motor angle sensor structure runs and the gear does not turn, it means that your machine has been blocked by an obstacle.

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Comprehensive enough!

In terms of accuracy, grating and magnetostriction measurements in displacement sensors have higher accuracy, followed by high-frequency eddy current and the like.

In practical situations, there are also some measurement methods such as ultrasound, laser, and wire drawing.