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https://www.sowaysensing.com/blogs/different-types-of-displacement-sensors.html

In today's precision-driven industrial environments, displacement sensors play a vital role in ensuring accurate positioning, monitoring, and feedback control in a variety of applications. Among the many available sensor technologies, LVDT displacement sensors (also known as linear variable differential transformers) have become a reliable solution for high-precision linear measurement. As a leading manufacturer in the sensor industry, Shenzhen Soway has expanded this core technology into a comprehensive range of displacement sensing solutions, including pneumatic, rebound, and split displacement sensors.

Although all three sensors are based on the same operating principle: when a probe is displaced from a probe, the mechanical movement is then detected by an internal sensor, usually using a magnetic, inductive or resistive sensing element. The displacement of the probe is directly converted into an electrical signal representing the change in the object's position. This type of sensor is well suited for environments where direct tactile measurement is possible and is the preferred choice for reliable contact sensing. However, they operate in very different working method.

1. Pneumatic Displacement Sensor – Air Pressure-Driven Contact Detection

Pneumatic displacement sensors operate by regulating the flow of compressed air to control the movement of the measuring rod. This contact-based sensing method makes it suitable for environments where non-mechanical actuation is preferred.

2. Rebound Displacement Sensor – Spring-Loaded Mechanical Contact Sensing

Rebound displacement sensors employ a mechanical probe integrated with a spring mechanism to maintain continuous contact with the target surface. As the measured object moves, the probe follows the motion, causing the spring to either compress or extend.

A spring-loaded stylus or rod projects from the sensor and remains in contact with the surface of the object. When displacement occurs, the mechanical motion is detected internally, typically via magnetic, inductive, or resistive sensing elements. The sensor then converts this movement into an electrical signal that accurately reflects the positional change.

This type of sensor is particularly well-suited for applications requiring reliable, tactile measurement, especially in environments where direct contact is feasible and advantageous for measurement accuracy.

3. Split Displacement Sensor – Modular Sensing with Remote Signal Processing

The split displacement sensor features a modular design where the sensing element and signal processing unit are physically separated. This configuration allows for more flexible installation and significantly reduces signal interference.

In operation, the independent sensor probe is mounted close to the measurement point and captures the target’s movement. The sensing head transmits analog or digital signals via cable to a remote processing unit, which interprets the raw data and outputs a calibrated displacement value.

By isolating the sensitive electronics from harsh environmental conditions—such as high temperatures, strong electromagnetic fields, or spatial constraints—this sensor design is ideal for advanced, industrial, or space-limited applications.

https://www.sowaysensing.com/blogs/different-types-of-displacement-sensors.html
Shenzhen Soway Technology Development Co., Ltd.

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