Knowledge of the sensor

A sensor is a detection device that can sense the measured information, and convert the information felt by bai into electrical signals or other required forms of information output according to certain rules to satisfy information transmission, processing, storage, display, and recording And control requirements.

According to the definition of sensor in my country's national standard GB7665-87, a sensor is a device or device that can perceive a specified measured part and convert it into a usable signal according to certain rules (mathematical function rules), usually composed of sensitive components and conversion components composition. Sensor is a general term that refers to a device or device that can sense specified measurement data and convert it into a usable output signal according to certain rules. The output signal is generally electricity.

A sensor, a device or device, can sense a specific measurement value and convert it into a usable output signal according to certain rules. Usually composed of sensitive elements and transforming elements. Sensitive element refers to the part of the sensor that can be directly measured (or responded). The conversion element refers to the part of the sensor that can be sensed (or responded to) by a more sensitive element and converted into an electrical signal for transmission and/or measurement.

The characteristics of sensors include miniaturization, digitization, intelligence, multi-function, systemization and networking. This is the first step to realize automatic detection and control. Generally, it is divided into ten categories according to its basic sensing function: heat sensitive components, photosensitive components, gas sensitive components, force sensitive components, magnetic sensitive components, humidity sensitive components, acoustic sensitive components, radiation sensitive components, color sensitive components, taste sensitive components element.

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The difference of the sensitive materials used in the sensor can be divided into tin dioxide, zinc oxide and iron oxide. Due to the wide variety of stimulants, this classification is not accurate; when the heater is isolated from the semiconductor material, the sensor of this structure is a side-heated gas sensor.

According to the different internal structure of the sensor, it can be divided into side heating type (porcelain tube type), direct heating type (ball type) and flat type (sheet structure). When the measured gas reacts with oxygen on the surface of the semiconductor, it usually requires a certain temperature. In order to obtain the required temperature, the sensor must be energized and heated by a heater.

When the heater is in direct contact with the semiconductor material, the sensor of this structure is a direct heating gas sensor. The flat type is one of the side heating types. Because its chip structure is also called a chip component, the application of printing technology in this sensor can improve the degree of mechanization of the sensor.