Pressure Sensor

- Dec 28, 2017 -

Pressure Sensor 

Pressure Transducer (Pressure Transducer) is able to feel the pressure signal, and according to certain laws of the pressure signal into a useful output of the electrical signal device or device.

Pressure sensors are usually pressure-sensitive components and signal processing unit. Press the different types of test pressure, pressure sensors can be divided into gauge pressure sensor, differential pressure sensor and absolute pressure sensor.

- Excerpted from JJG860-2015

Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in a variety of industrial automation environments, including water conservancy and hydropower, railway traffic, intelligent building, production control, aerospace, military, petrochemical, oil wells, electric power, ships, machine tools , Pipelines and many other industries.

Working principle editor

1, piezoresistive force sensor

Resistance strain gauges are one of the main components of piezoresistive strain gages. The working principle of metal strain gage is adsorbed on the substrate material strain resistance with mechanical deformation resulting change in resistance phenomenon, commonly known as resistance strain effect.

2, ceramic pressure sensor

Ceramic pressure sensor based on piezoresistive effect, the pressure directly on the front surface of the ceramic diaphragm, the diaphragm to produce small deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a Wheatstone bridge, the varistor The piezoresistive effect, the bridge produces a pressure-proportional and highly linear, and the excitation voltage is also proportional to the voltage signal, the standard signal according to the pressure range of different calibration of 2.0 / 3.0 / 3.3mV / V, etc., and Strain sensor compatible.

3, diffused silicon pressure sensor:

Diffusion silicon pressure sensor works based on piezoresistive effect, the use of piezoresistive effect principle, the measured medium pressure directly on the diaphragm of the sensor (stainless steel or ceramic), so that the diaphragm and the media pressure is proportional to the micro-displacement, The sensor resistance value changes, the use of electronic circuits to detect this change, and convert the output of a standard measurement signal corresponding to this pressure.

4, sapphire pressure sensor:

The use of strain-resistance type of work, the use of silicon - sapphire as a semiconductor-sensitive components, with unparalleled measurement. Therefore, the use of silicon - sapphire semiconductor sensor is insensitive to temperature changes, even in high temperature conditions, has good operating characteristics; sapphire radiation resistance is extremely strong; In addition, silicon - sapphire semiconductor sensor, no pn drift.

5, piezoelectric pressure sensor:

Piezoelectric effect is the main working principle of piezoelectric sensors, piezoelectric sensors can not be used for static measurement, because the charge after the external force only in the circuit with infinite input impedance is saved. The actual situation is not the case, so this determines the piezoelectric sensor can only measure the dynamic stress.


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