By use
Pressure-sensitive and force-sensitive sensors, position sensors, liquid level sensors, energy consumption sensors, speed sensors, acceleration sensors, radiation sensors, thermal sensors.
According to principle
Vibration sensors, humidity sensors, magnetic sensors, gas sensors, vacuum sensors, biosensors, etc.
Press output signal
Analog sensor: converts the measured non-electrical quantity into an analog electrical signal.
Digital sensor: converts the measured non-electrical quantity into a digital output signal (including direct and indirect conversion).
Digital sensor: converts the measured signal quantity into a frequency signal or a short-period signal output (including direct or indirect conversion).
Switch sensor: When a measured signal reaches a certain threshold, the sensor outputs a set low-level or high-level signal accordingly.
According to its manufacturing process
Integrated sensors are fabricated using standard process technologies for producing silicon-based semiconductor integrated circuits. Usually some circuits used for preliminary processing of the measured signal are also integrated on the same chip.
Thin film sensors are formed by depositing thin films of corresponding sensitive materials on a dielectric substrate (substrate). When using a hybrid process, part of the circuit can also be fabricated on this substrate.
Thick film sensors are made by coating the slurry of corresponding materials on a ceramic substrate. The substrate is usually made of Al2O3, and then heat treated to form a thick film.
Ceramic sensors are produced using standard ceramic processes or some variant thereof (sol, gel, etc.).
After appropriate preparatory operations, the shaped components are sintered at high temperatures. There are many common characteristics between the two processes of thick film and ceramic sensors. In some respects, the thick film process can be considered a variation of the ceramic process.
Each process technology has its own advantages and disadvantages. Due to the low capital investment required for research, development and production, as well as the high stability of sensor parameters, the use of ceramic and thick film sensors is more reasonable.
According to measurement purpose
Physical sensors are made by utilizing the characteristics of certain physical properties of the measured substance that change significantly.
Chemical sensors are made of sensitive elements that can convert chemical quantities such as the composition and concentration of chemical substances into electrical quantities.
Biosensors are sensors made by utilizing the characteristics of various organisms or biological substances to detect and identify chemical components in organisms.
According to its composition
Basic sensor: It is the most basic single conversion device.
Combined sensor: It is a sensor composed of a combination of different individual transformation devices.
Applied sensor: It is a sensor composed of a basic sensor or a combined sensor and other mechanisms.
According to action form
According to the mode of action, they can be divided into active and passive sensors.
Active sensors are divided into action type and reaction type. This type of sensor can emit a certain detection signal to the object being measured, and can detect the changes caused by the detection signal in the object being measured, or the detection signal can produce some kind of detection signal in the object being measured. effect to form a signal. The method of detecting signal changes is called the action type, and the method of detecting and responding to form a signal is called the reaction type. Radar and radio frequency range detectors are examples of the action type, while photoacoustic effects analyzers and laser analyzers are examples of the reaction type.
Passive sensors only receive signals generated by the measured object itself, such as infrared radiation thermometers, infrared camera devices, etc.