How many types of pressure sensors are there?
This article is edited by Shenzhen Huanan Hengtai Industrial Co., LTD., if reproduced, please indicate the source
Pressure sensors can be divided into many types according to their working principles and application scenarios. Here are some common pressure sensor types and their brief introduction:
1. Piezoresistive sensor:
- Working principle: By applying pressure to the front surface of the diaphragm, the diaphragm is deformed. A thick film resistor is printed on the back of the pressure-sensitive diaphragm to form a Wheatstone bridge. Under the piezoresistive effect, the bridge generates a voltage signal proportional to the excitation voltage.
- Application scenario: Widely used in various industrial environments where pressure measurement is required.
2. Piezoelectric sensor:
- Working principle: Based on the positive piezoelectric effect, when the external force is applied to the electrolyte to deform it, the internal polarization of the electrolyte will occur, resulting in a positive voltage. The polarity of the charge changes with the direction of the force.
- Application scenario: applies to scenarios where dynamic pressure changes need to be measured.
3. Strain sensor:
- Working principle: Use strain gauges to convert mechanical strain into a change in resistance value. Strain gauges are made of metal conductors or semiconductors, and their resistance varies with the strain created by the pressure.
- Application scenario: It is common in situations where high precision pressure measurement is required.
4. Capacitive sensor:
- Working principle: The pressure change is reflected by measuring the capacitance change of the capacitor composed of electrodes on the isolation diaphragm on both sides of the sensitive element.
- Application scenario: It is often used to measure pressure changes of liquids or gases.
5. Electromagnetic pressure sensor:
- Type: including inductance pressure sensor, Hall pressure sensor, eddy current pressure sensor, etc.
- Working principle: Based on electromagnetic principle, the pressure change is reflected by measuring the change of magnetic material and permeability.
- Application scenario: It is more common in applications requiring high sensitivity and large range measurement.
6. Optical fiber pressure sensor:
- Working principle: The use of light wave conduction pressure information, with good electrical insulation, corrosion resistance, no spark and other advantages.
- Application scenario: It is suitable for pressure measurement in special environments such as high pressure, flammable and explosive.
7. Diffused silicon pressure transmitter:
- Working principle: The isolated silicon piezoresistive pressure sensor is encapsulated in a stainless steel housing, which can convert the felt liquid or gas pressure into a standard electrical output.
- Application scenario: Widely used in power supply/drainage, heat, petroleum, chemical, metallurgy and other industrial process on-site measurement and control.
Please note that these are only some of the common types of pressure sensors, with the development of technology and application scenarios, there may be more new types of pressure sensors.
The above information is for reference only, not for professional literature
