Introduction: In life, especially some of the need for high-precision measurements and calculations of the occasion, our ears often hear people talk about the "Hall sensing device," the ordinary people less people understand the things. So what is a Hall sensor? What exactly is the use of Hall sensors?
The Hall sensor device comes from the American scientist Hall for the study of metal conductivity. Through Hall's research, found that conductors and semiconductors, conductive fluids can produce magnetoelectric effect. And through the later researchers found that the semiconductor can produce the magnetoelectric effect is much stronger than the conductor, so people began to use the Hall phenomenon to produce a variety of Hall components, used for measurement, information processing and other aspects. Hall sensor is the use of Hall phenomenon research and development of a new class of products, the next, and we talk about Hall sensors in all aspects of the application.
Applied to a variety of data measurement
Hall sensors used in the measurement of data, is the most widely used areas. Hall sensors can be used to measure a variety of physical quantities such as linear velocity, acceleration, rotational speed, wind speed, flow speed, and object displacement. When measuring these physical parameters of an object, we can add semiconductor material to the surface of the object to be measured, and then, using the Hall sensor can capture the magnetic field of the semiconductor material to measure the object in real time, so that we can get the parameter about the speed of the object's movement through the Hall sensor.
In addition, Hall sensors are also used in the circuit of the current measurement and control. As we all know, the circuit energized will produce a magnetic field, and the application of Hall sensors can accurately capture the changes in the magnetic field of the circuit, so that the current changes in the circuit for real-time measurement and control. Therefore, many of the meters now contain Hall components.
Application to automation control
Life, the use of the Hall effect and Hall sensors to automate objects are very many applications. Here are two of the most common examples.
When we enter some high-grade places, such as star hotels, we will enter those automatic doors. These doors will automatically open when the human body is close, which to a certain extent is the use of the Hall effect as well as Hall sensors. The human body is a semiconductor, with the Hall effect, the designers set up Hall sensors in the induction door, Hall sensors will be in the human body close to the time, instantly capture the magnetic field effect, for people to open the "door of convenience".
Another application is that Hall sensors are used in some automatic alarm devices, in the event of an emergency, such as fire, Hall sensors will be able to detect changes in the magnetic field, issued an alarm, warning people that the situation has occurred.
Applied to medical devices
Hall sensors are also widely used in medical devices. Utilizing the Hall effect, they can accurately detect the health of organs within the human body and improve the accuracy of medical equipment.
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