　 First, the composition of the sensor
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Second, the classification of sensors
1. Sort by input quantity
Physical sensor: temperature sensor, pressure sensor, displacement sensor
Chemical quantity sensor
Biomass sensor
2. Classified by output signal form
Divided into analog, switch and digital.
3. Classified by conversion principle
Structure type: The mechanical component is used to generate deformation or displacement under the action of the dynamic field or the magnetic field, and the external measured parameters are converted into corresponding physical quantities such as resistance, inductance and capacitance . It is realized by the laws of physical motion or the laws of electromagnetism.
Physical properties: using solid physical properties of materials and various physical and chemical effects (material law, Hooke's law, Ohm's law ) to achieve non-electrical conversion, solid-state devices using semiconductors, electrolytes, ferroelectrics, etc. as sensitive materials. .
Composite type: It has a combination of structural sensors and physical sensors, and has the characteristics of both, such as resistive, photoelectric, thermal, gas sensitive, moisture sensitive, magnetic sensitive and so on.
　 Third, the basic characteristics of the sensor
1. Static characteristics of the sensor
The static characteristic indicates the relationship between the output and the input when the measured value of the sensor is in a steady state. It mainly includes sensitivity, linear blockage, hysteresis, repeatability, resolution and zero drift.
2. Dynamic characteristics of the sensor
The response of the sensor is examined according to different input variations.
　Â
Second, the classification of sensors
1. Sort by input quantity
Physical sensor: temperature sensor, pressure sensor, displacement sensor
Chemical quantity sensor
Biomass sensor
2. Classified by output signal form
Divided into analog, switch and digital.
3. Classified by conversion principle
Structure type: The mechanical component is used to generate deformation or displacement under the action of the dynamic field or the magnetic field, and the external measured parameters are converted into corresponding physical quantities such as resistance, inductance and capacitance . It is realized by the laws of physical motion or the laws of electromagnetism.
Physical properties: using solid physical properties of materials and various physical and chemical effects (material law, Hooke's law, Ohm's law ) to achieve non-electrical conversion, solid-state devices using semiconductors, electrolytes, ferroelectrics, etc. as sensitive materials. .
Composite type: It has a combination of structural sensors and physical sensors, and has the characteristics of both, such as resistive, photoelectric, thermal, gas sensitive, moisture sensitive, magnetic sensitive and so on.
　 Third, the basic characteristics of the sensor
1. Static characteristics of the sensor
The static characteristic indicates the relationship between the output and the input when the measured value of the sensor is in a steady state. It mainly includes sensitivity, linear blockage, hysteresis, repeatability, resolution and zero drift.
2. Dynamic characteristics of the sensor
The response of the sensor is examined according to different input variations.
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