The sensor is called "industrial handicraft", is a kind of detection device, can feel the measured information, and can transform the sensed information into electrical signals or other required forms of information output according to a certain rule to satisfy the information Requirements for transmission, processing, storage, display, recording and control.
To put it simply, the appearance of sensors gives objects the senses of touch, taste, and smell, and makes objects slowly come alive. At present, sensors are developing in the direction of intelligence, miniaturization, multi-function, low power consumption, and high precision.
The development of industry is inseparable from the blessing of many sensing technologies, one of the most critical technologies is the sensor. It can be said that industrial sensors give automatic smart devices the ability to perceive. The evaluation of the quality of an industrial sensor mainly focuses on indicators such as sensitivity, resolution, compactness, long-term stability, thermal drift and power efficiency. It has the typical characteristics of technology-intensive, multi-variety, small batch, flexible use and wide application distribution.
In recent years, the wave of smart manufacturing has become higher and higher, and a key technology that is very important for the construction of smart factories is industrial sensors. Sensors provide tactile sensation for smart factories and are the primary link to realize automatic detection and automatic control. In the automated production process, various sensors are needed to monitor and control various parameters to make the equipment work in a normal or optimal state, and to make the products reach the best quality.
Sensors are devices designed according to the physical, chemical, and biological characteristics and laws of materials. There are many types. They are usually divided into heat-sensitive elements, photosensitive elements, gas-sensitive elements, force-sensitive elements, and magnetic-sensitive elements according to their basic sensing functions. , Humidity sensitive components, acoustic components, radiation sensitive components, color sensitive components and taste sensitive components and other ten categories.
In the field of measurement and control, a sensor designed by a certain principle can measure multiple non-electric quantities at the same time, and sometimes a non-electric quantity can be measured by sensors with different principles. Therefore, there are many classification methods for sensors, generally according to the following Method classification.
This classification clearly expresses the purpose of the sensor, but it is not convenient to find out the similarities and differences of the conversion principle of each sensor.
This classification method is based on the principles, laws and effects of physics and chemistry, and can be divided into physical sensors, chemical sensors and biological sensors. Such as voltage type, thermoelectric type, resistive type, photoelectric type, inductive type, etc.
The advantage is that the working principle of the sensor is relatively clear and there are few categories, which is conducive to in-depth analysis and research on the sensor.
Divided into solid-state sensors such as semiconductor force sensitive, thermal sensitive, photosensitive, and gas sensitive.
It can be divided into integrated sensors, thin film sensors, thickness sensors and ceramic sensors.
According to the output, there are switch, analog and digital sensors. The output signal of the analog sensor is an analog quantity; the output signal of the digital sensor is a digital quantity, which is convenient for use with a computer and has strong anti-interference.
It can be divided into basic sensors, combined sensors and application sensors.
It can be divided into active sensors and passive sensors.