Wiring method of displacement sensor Principle and application of displacement sensor
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Wiring method of displacement sensor Principle and application of displacement sensor

Posted Date: 2024-02-04

What does a displacement sensor consist of?

The composition and structure of the displacement sensor can vary according to different working principles. The following are the components of several common displacement sensors:

1. Photoelectric sensor:

- Light source: usually a light emitting diode (LED) or laser, which emits a beam of light.
- Receiver: usually a photoresistor, photodiode or photodiode that receives the reflected light beam.
- Amplifier and signal processing circuit: used to amplify and process the received optical signal.
- Control circuit: used to control the working status of the light source and receiver.

2. Volumetric sensor:

- Measuring chamber: used to contain the measuring medium.
- Pressure sensor or level sensor: used to measure volume changes.
- Pressure transmitter: used to convert measured values ​​into electrical signals.
- Control circuit: used to control and process the working status and signals of the sensor.

3. Cantilever beam sensor:

- Cantilever beam structure: made of elastic material whose length and shape change with displacement.
- Strain gauge: fixed on the cantilever beam, used to measure the deformation of the material.
- Strain gauge amplifier: used to amplify and process the electrical signals of strain gauges.
- Control circuit: used to control and process the working status and signals of the sensor.

4. Piezoresistive sensor:

- Piezoresistive materials: usually conductive rubber or silicon carbide, whose resistance changes with displacement.
- Circuit board: used to connect the electrodes of the piezoresistive material.
- Signal conditioning circuit: used to measure and process changes in resistance of piezoresistive materials.

5. Magnetic sensor:

- Magnetic sensitive element: usually a magnetoresistor (MR) or Hall element, used to sense magnetic field changes.
- Magnetic field generator: usually a permanent magnet or electromagnetic coil, used to generate a magnetic field.
- Signal amplifier and processing circuit: used to amplify and process electrical signals generated by magnetically sensitive components.

6. Ultrasonic sensor:

- Ultrasonic generator: generates ultrasonic signals.
- Ultrasonic receiver: receives the reflected ultrasonic signal.
- Control circuit: used to control the working status and signals of the ultrasonic generator and receiver.

Displacement sensor wiring method

Displacement sensors also differ according to the working methods of various models and different wiring methods. The mainstream ones are divided into two-wire system (positive power supply, positive signal output), three-wire system (positive power supply, negative power supply, positive signal output), and four-wire system. System (power positive, negative, signal positive, negative).

Two-wire system: The sensor power supply is connected to the positive switching power supply, and the sensor signal line is connected to the equipment input end. If the device has a negative input, connect the negative input and the negative pole of the switching power supply with one wire; three-wire system: adjust the installation of the building automation sensor according to the device port. If the device has only three ports, then the three wires of the sensor (power supply positive, negative, Outputs positive) are connected directly to the three ports of the device. If the device has a four-wire port, leave the negative input terminal of the device in series with the negative terminal of the power supply. The same is true for the two-wire system;

Four-wire system: Simply connect the power cords to the device ports one by one.

Principles and applications of displacement sensors

A displacement sensor is a device used to measure the relative position or change in position of an object. Its working principle is based on different technologies and principles. The following are several common displacement sensor principles and applications:

1. Photoelectric sensor: Use the photoelectric effect to measure the position changes of objects. Common applications include paper sensors in printers, position detection in industrial automation, etc.

2. Volumetric sensor: obtains displacement information based on measuring changes in the intrusion volume of objects. Common applications include fuel metering, liquid level measurement, etc.

3. Cantilever sensor: measures displacement based on the change in impedance of an elastic material as it changes shape. Common applications include pressure sensors, force sensors, etc.

4. Piezoresistive sensor: Displacement measurement is achieved due to the change in resistance of the piezoresistive material. Common applications include touch screens, force feedback devices, etc.

5. Magnetic sensor: Uses the principle of magnetic field induction to measure displacement. Common applications include head positioning in disk drives, vehicle speed sensors, etc.

6. Ultrasonic sensor: Use the reflection time of ultrasonic waves to calculate the distance between the object and the sensor to obtain displacement information. Common applications include ranging equipment, smart door locks, etc.


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