A sensor is a detection device that can sense the information being measured and transform the sensed information into an electrical signal or other required form of information output according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording and control.
What is a current sensor?
A current sensor is a detection device that can sense the information of the current being measured and transform the sensed information into an electrical signal or other required form of information output that meets certain standards, so as to meet the requirements of information transmission, processing, storage, display, recording and control.
Current sensors, also known as magnetic sensors, are used in many aspects of our lives, such as in home appliances, smart grids, electric vehicles, wind power generation, and more. For example, they are also used in computer hard drives, compasses, and other household appliances.
What are the classifications of current sensors?
Based on different measurement principles, current sensors can be mainly divided into: shunt current transformers, electromagnetic current transformers, and electronic current transformers.
Electronic current transformers include Hall current sensors, Rokowski current sensors, and AnyWay variable frequency power sensors (which can be used for voltage, current, and power measurements) specifically designed for variable frequency power measurement.
Compared with electromagnetic current sensors, electronic current transformers do not have ferromagnetic saturation, have a wide transmission bandwidth, small secondary load capacity, small size, and light weight, and represent the future development direction of current sensors.
Fiber optic current sensors are a new type of current sensor based on the Faraday magneto-optical effect and using optical fiber as the medium.
When linearly polarized light propagates in a medium, if a strong magnetic field is applied parallel to the direction of light propagation, the direction of light vibration will be deflected. The deflection angle ψ is proportional to the product of the magnetic induction intensity B and the length l of the light passing through the medium, i.e., ψ = V * B * l. The proportionality constant V is called the Field constant, which is related to the properties of the medium and the frequency of the light wave. The direction of deflection depends on the properties of the medium and the direction of the magnetic field. This phenomenon is called the Faraday effect, discovered by M. Faraday in 1845.
