According to the definition of sensor in the national standard GB7665-87, a sensor is a device or device that can sense a specified measured object and convert it into a usable signal according to a certain law (the law of mathematical functions), and usually consists of a sensitive element and a conversion element. Sensors are the general names of devices or devices that can sense the specified measurement signals and convert them into usable output signals according to certain rules. The output signal is usually electricity.
Sensor, a device or equipment that can sense the specified measurement signal and convert it into usable output signal according to certain rules. It usually consists of a sensing element and a conversion element. Sensing element refers to the part of the sensor that can be measured directly (or in response to measurement). A conversion element refers to a part of a sensor that can be sensed (or responded) by a more sensitive element and converted into an electrical signal related to transmission and/or measurement.
The characteristics of sensors include miniaturization, digitalization, intelligence, multifunction, systematization and networking. This is the first step to realize automatic detection and automatic control. Generally, according to its basic sensing function, it can be divided into ten categories: heat sensitive element, light sensitive element, gas sensitive element, force sensitive element, magnetic sensitive element, humidity sensitive element, sound sensitive element, radiation sensitive element, color sensitive element and taste sensitive element.
Extended data;
The different sensitive materials used in the sensor can be divided into: SnO2, ZnO, Fe2O3, etc. Because there are many kinds of stimulants, this classification is inaccurate; This sensor is an indirect heating gas sensor when the heater is isolated from the semiconductor material.
According to the different internal structure of the sensor, it can be divided into indirect heating type (porcelain tube type), direct heating type (ball-bead type) and planar type (chip type structure). When the gas to be measured reacts with oxygen on the semiconductor surface, it usually needs a certain temperature. In order to obtain the required temperature, the sensor must be energized and heated by the heater.
When the heater is in direct contact with the semiconductor material, the sensor is a directly heated gas sensor; Plane sensor belongs to indirect heating type, because its chip structure is also called chip element. The application of printing technology in this sensor can improve the mechanization of the sensor.
Reference materials? Baidu encyclopedia-sensor