1. A displacement sensor, also known as a linear sensor, is a linear device that uses metal induction. Its function is to convert various measured physical quantities into electrical signals. In production processes, displacement measurement is generally divided into two types: measuring physical dimensions and measuring mechanical displacement. Based on the form of transformation of the measured variable, displacement sensors can be divided into analog and digital types. Analog sensors can be further divided into property-based and structural types.
2. Commonly used displacement sensors are mostly analog in structure, including potentiometer-type displacement sensors, inductive displacement sensors, synchro sensors, capacitive displacement sensors, eddy current displacement sensors, and Hall effect displacement sensors. A significant advantage of digital displacement sensors is their ability to directly transmit signals to computer systems. These sensors are developing rapidly and are increasingly widely used.
3. Displacement sensors: Among them, grating sensors are increasingly widely used in machine tool processing, testing instruments and other industries due to their advantages such as easy digitization, high precision (currently the highest resolution can reach the nanometer level), strong anti-interference ability, no human reading error, convenient installation and reliable use.
Types of displacement sensors:
1. A displacement sensor is a device that converts the motion displacement of an object into a measurable electrical quantity. It is typically used to convert physical quantities such as displacement, position, deformation, vibration, and size, which are difficult to quantitatively detect and process, into electrical quantities that are easy to quantitatively detect and facilitate information transmission and processing.
2. Potentiometer-type displacement sensor: This type of sensor converts mechanical displacement into a resistance or voltage output that has a linear or arbitrary functional relationship with it through a potentiometer element. Ordinary linear potentiometers and circular potentiometers can be used as linear and angular displacement sensors, respectively. However, potentiometers designed for displacement measurement require a definite relationship between displacement change and resistance change. The movable brush of a potentiometer-type displacement sensor is connected to the object being measured.
3. The displacement of an object causes a change in resistance at the moving end of a potentiometer. The amount of change in resistance reflects the magnitude of the displacement, and whether the resistance increases or decreases indicates the direction of the displacement. Typically, a power supply voltage is applied to the potentiometer to convert the change in resistance into a voltage output.
4. Magnetostrictive displacement sensor: This sensor uses internal non-contact measurement and control technology to accurately detect the absolute position of a moving magnetic ring to measure the actual displacement of the product being tested. It utilizes the magnetostrictive principle, generating a strain pulse signal through the intersection of two different magnetic fields to accurately measure position. The measuring element is a waveguide, and the sensitive element inside the waveguide is made of a special magnetostrictive material.
5. Magnetostrictive displacement sensors are high-precision, long-stroke absolute position measurement sensors manufactured based on the magnetostrictive principle. They employ an internal non-contact measurement method. Because the moving magnetic ring used for measurement and the sensor itself do not have direct contact, they are not subject to friction or wear. Therefore, they have a long service life, strong environmental adaptability, high reliability, good safety, and are easy to automate in systems. They can operate normally even in harsh industrial environments (such as those susceptible to oil spills, dust, or other contamination).
Features of displacement sensors:
1. The function of a linear displacement sensor is to convert linear mechanical displacement into an electrical signal. To achieve this, a variable resistance slide rail is usually fixed at a fixed position on the sensor, and different resistance values are measured by the displacement of the slider on the slide rail.
2. The sensor slide rail is connected to a steady-state DC voltage, allowing a small current of microamperes to flow. The voltage between the slider and the starting end is proportional to the length the slider moves. Using the sensor as a voltage divider minimizes the requirement for the accuracy of the total resistance of the slide rail, because resistance changes caused by temperature variations will not affect the measurement results.
3. Angle displacement sensors are used for obstacle handling: Using angle sensors to control your wheels can indirectly detect obstacles. The principle is very simple: if the motor angle sensor is running but the gears are not turning, it means your machine is blocked by an obstacle.
