Banner Sensors - Classification of Displacement Sensors and Their Introduction

Depending on the mode of exercise

　　Linear displacement sensors：

The function of a linear displacement sensor is to convert the linear mechanical displacement into an electrical signal. In order to achieve this, the variable resistance slide is usually fixed on the fixed part of the sensor, and the different resistance values are measured by the displacement of the slide blade on the slide rail. The sensor slide is connected to a steady-state DC voltage that allows a small current to flow through microamperes, and the voltage between the slide and the start is proportional to the length of the slide movement. The use of the sensor as a voltage divider minimizes the requirement for the accuracy of the total resistance value of the slide rail, as the change in resistance caused by temperature changes does not affect the measurement results.

　　Angular displacement sensor：

Angular Displacement Sensors for Obstacle Handling: Using an Angle Sensor to control your wheels can indirectly detect obstacles. The principle is very simple: if the motor angle sensor is running and the gears are not turning, your machine is blocked by obstacles. This technique is very simple to use and very effective; The only requirement is that the wheels of the movement must not slip on the floor (or slip too many times), otherwise you will not be able to detect obstacles. This problem can be avoided by an idling gear attached to the motor, which is not driven by the motor but by the movement of the device: if the idler stops while the drive wheel is rotating, you have hit an obstacle.

　　According to the material

　　Hall displacement sensors: Its measurement principle is to keep the excitation current of the Hall element (see semiconductor magnetocent) constant and make it move in a gradient uniform magnetic field, then the displacement is proportional to the output Hall potential. The larger the magnetic field gradient, the higher the sensitivity; The more uniform the gradient variation, the closer the relationship between the Hall potential and the displacement is linear. Figure 2 shows three types of magnetic systems that generate gradient magnetic fields: a system with a narrow linear range and a Hall potential of ≠0 at displacement Z=0; The b system has good linearity when Z <2 mm, when Z=0, the Hall potential = 0, and the c system has high sensitivity and the measurement range is less than 1 mm. In Figure 2, N and S represent the positive and negative poles, respectively. Hall displacement sensors have low inertia, high frequency response, reliable operation and long service life, so they are often used in the occasion of converting various non-electric power into displacement before measurement.

　　Photoelectric displacement sensor: It measures the displacement or geometric size of an object based on how much it blocks the luminous flux. It is characterized by non-contact measurement and continuous measurement. Photoelectric displacement sensors are often used for continuous measurement of wire diameter or as edge position sensors in strip edge position control systems.

Banner Sensors - Classification of Displacement Sensors and Their Introduction

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