Introduction of common rfid sensors.Pet Microchip wholesale

　　Introduction of common rfid sensors

　　1. Temperature sensor: a device that converts temperature changes into electrical signals.

　　(1)Contact type: high precision. Commonly used: bimetal/glass/pressure/thermistor/thermocouple, etc.

　　(2) Non-contact: using the basic law of black body radiation (the relationship between the emissivity and frequency of electromagnetic radiation emitted from a black body)

　　Advantages: There is no upper limit to the highest measurable temperature.

　　(3) Thermocouple: The temperature difference between the working end (A) and the free end (B) of two different conductors is used to form a loop and generate a thermoelectromotive force.

　　Features: high precision, wide range, simple structure.

　　(4) Thermistor: A device that uses the resistance change caused by the temperature change of the semiconductor.

　　Advantages: high sensitivity, small size, fast response to temperature changes.

　　Disadvantages: Not strong, easy to self-heat and cause permanent damage.

　　(5) Infrared thermometer: Using the principle of infrared, the infrared radiation energy emitted by the measured object is converted into an electrical signal through an optical signal.

　　Advantages: non-contact, fast response, long life.

　　Applications: target size, distance, material, environment and target material.

　　2. Acceleration sensor:

　　(1) Piezoelectric: The piezoelectric effect of piezoelectric ceramics or quartz crystals is used.

　　Advantages: Wide dynamic range, no external power supply, rugged and durable.

　　Application: Vibration measurement sensing.

　　(2) Capacitive: A capacitive sensor based on the principle of capacitance with a change in pole distance.

　　Advantages: high precision, stable output, small drift, low cost.

　　(3) Force sensor: a device that converts the physical quantity of force into related electrical signals.

　　Classification of force sensors: strain type/piezoresistive type/capacitive type (there are many types) Problems to be considered when using:

　　.Choose suitable equipment according to specific occasions

　　.According to the environment: temperature, sealing, explosion-proof, etc.

　　.According to accuracy requirements:

　　.Sensor range: Generally, the range should be more than 2 times of the impact force.

　　(4) Gas sensor: It is converted into an electrical signal device according to the gas volume fraction.

　　Classification: Semiconductor / Electrochemical / Thermal Conductor / Infrared / Catalytic Combustion / Dielectric

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