What Are the Different Types of Electronic Sensor?
A sensor is a device that receives signals or stimulates and responds. It can convert the physical or chemical quantity to be measured into another corresponding output device. Used for automation control, security equipment, etc. In the stimulation subject, in order to obtain electrical stimulation, electronic stimulation devices are often used during this time.
- The national standard GB7665-87 defines the sensor as: "A device or device that can feel the specified measured and converted into a usable signal according to a certain rule.
- The effect of the input of a sensor on the output is called the sensor coefficient. For example, a mercury thermometer, each time the temperature rises by 1 ° C, the mercury column rises by 1 cm, the sensing coefficient of this mercury thermometer is 1 cm / ° C.
- When the input and output of a sensor completely form a linear relationship, the sensor is an ideal sensor. At the same time, ideal sensors should also adhere to the following principles:
- 1. Only affected by the tested factors;
- 2. Not affected by other factors;
- 3. The sensor itself will not affect the measured factors.
- Applications of sensorsThe application fields of sensors involve machinery manufacturing, industrial process control, automotive electronics, communications electronics,
- Inductors convert one form of energy into another form of energy. There are two types: active and passive.
- Active sensors can transform one form of energy directly into another without the need for an external energy source or excitation source.
- Passive sensors cannot directly convert energy forms, but they can control the energy or excitation energy input from the other input end. The sensors undertake the task of converting specific characteristics of an object or process into quantities. Its "objects" can be solid, liquid, or gas, and their states can be static or dynamic (ie, processes). Object characteristics can be detected in a variety of ways after being quantified. Object properties can be physical or chemical. According to its working principle, it converts object characteristics or state parameters into measurable electrical quantities, and then separates this electrical signal and sends it to the sensor system for evaluation or labeling.
- The automatic control system can complete certain tasks according to human design without human participation. The key lies in the introduction of feedback. Feedback is actually adding the output or state of the system to the input of the system and the input of the system to act on the system. The output state of the system is actually various physical quantities. Some of them are voltage, others are flow rate, speed, and so on. These quantities are often different in nature from the input quantity of the system, and the range of values varies. So it cannot be directly combined with the input, it needs to be measured and transformed. The sensor plays this role. It is like the eyes and skin of the control system, senses various changes in the control system, and cooperates with other parts of the system to complete the control task.
- In order to obtain information from the outside world, humans must rely on sensory organs. But human sense organs are not omnipotent. If we want to obtain more abundant information, and further study natural phenomena and manufacture labor tools, human senses are not enough. As a tool to replace human senses, the history of sensors is older than the appearance of modern science. Balances have been used as a weight measurement tool in ancient Egypt and have been used to this day. Temperature measurement using liquid expansion characteristics has been around since the sixteenth century. Inductors based on the basic principles of electricity are based on the development of modern electromagnetics. However, with the improvement of the reliability of active components such as vacuum tubes and semiconductors, this type of inductor has developed rapidly. When it comes to sensors, most of them refer to devices that have an electrical signal output.
- Sensor-related terms:
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