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A capacitive displacement sensor is a device that measures linear or angular displacement using changes in capacitance. Capacitive displacement sensors can be divided into four main categories based on their working principles and structural characteristics. This article will explain these four classifications in detail to help readers better understand the working principle and application fields of capacitive displacement sensors.
(1) Variable pole pitch capacitive displacement sensor: This sensor has high sensitivity, but the relationship between capacitance change and pole pitch change is nonlinear. The other two types of displacement sensors have relatively good linearity, but their sensitivity is relatively low.
(2) Variable plate area capacitive displacement sensor: This sensor is used for linear displacement measurement and can also be used for angular displacement measurement. By changing the area of the plate, the value of the capacitance can be changed, allowing measurement of displacement.
(3) Variable dielectric capacitive displacement sensor: This sensor is usually used to measure displacement or size and has good linear characteristics, but there is a nonlinear relationship between input/output. By changing the nature or shape of the medium, the value of the capacitance can be changed, thereby achieving the measurement of displacement.
(4) Capacitive grid capacitive displacement sensor: It is developed on the basis of the variable plate area capacitive displacement sensor. Grid capacitive displacement sensors can be divided into two types: long capacitive grid and circular capacitive grid. Due to the existence of multi-level capacitance and averaging effects, this sensor has high resolution, high accuracy and a large measurement range, which can reduce the requirements for marking accuracy and installation accuracy. It is a sensor with great potential.
In summary, capacitive displacement sensors can be classified according to different principles and structural characteristics of capacitance change, including four types: variable pole pitch type, variable plate area, variable dielectric type and capacitive grid type. Each type of sensor has different characteristics and scope of application, and can be widely used in various fields, such as industrial automation, instrumentation, and robotics. With the continuous advancement and innovation of science and technology, the performance of capacitive displacement sensors will be further improved, bringing more convenience and benefits to applications in various fields.
