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Sensors Common Types

Sinocera Piezotronics, INC | Updated: Jun 30, 2017

Sensors Common types

Common types

Resistive

Resistive sensors are devices that will be measured, such as displacement, deformation, force, acceleration, humidity, temperature, etc. These physical quantities are converted into resistors. Mainly resistance strain type, piezoresistive, thermal resistance, thermal, gas sensitive, humidity sensitive and other resistive sensing devices.

Variable frequency power

Frequency conversion power sensor through the input voltage and current signal for AC sampling, and then sampling

 Value through the cable, optical fiber and other transmission systems connected to the digital input secondary instrument, digital input secondary instrument on the voltage and current sampling value of the operation, you can get the voltage RMS, current RMS, the fundamental voltage, the fundamental current , Harmonic voltage, harmonic current, active power, fundamental power, harmonic power and other parameters.

Weighing

The load cell is a force-to-electrical conversion device that converts gravity into electrical signals and is a key component of an electronic weighing instrument.

There are a variety of sensors that can achieve force → electrical conversion, common resistance strain type, electromagnetic force type and capacitor type. Electromagnetic force is mainly used for electronic balance, capacitive for some electronic crane scale, and the vast majority of weighing instruments used in the resistance strain gauge load cell. Resistive strain gauge load cell structure is relatively simple, high accuracy, wide application, and can be used in relatively poor environment. So the resistance strain gauge load cell in the instrument has been widely used.

Resistance strain type

The resistance strain gauge in the sensor has the strain effect of the metal, that is, under the action of external force to produce mechanical deformation, so that the resistance value with the corresponding changes. Resistance strain gauges are mainly metal and semiconductor two types of metal strain gauge with wire, foil, thin film of the points. Semiconductor strain gauges have the advantages of high sensitivity (usually silk, foil several times), lateral effects and so on.

Piezoresistive

Piezoresistive sensor is based on the piezoresistive effect of semiconductor materials in the semiconductor material on the substrate by the diffusion resistance of the device made of. The substrate can be directly measured as a sensing element, the diffusion resistance in the substrate into the bridge form. When the substrate is subjected to external forces to produce deformation, the resistance value will change, the bridge will produce a corresponding unbalanced output.

The silicon piezoresistive sensor made of silicon substrate and silicon wafer as the sensitive material is mainly paid attention to by the substrate (or diaphragm) material used as the piezoresistive sensor. Especially, the pressure And the speed of solid-state piezoresistive sensor applications is most common.