What Is A Current Sensor? What Are The Classifications of Current Sensors?
A sensor is a detection device that can sense the measured information, and can transform the sensed information into electrical signals or other required forms of information output according to certain rules, so as to meet the requirements of information transmission, processing, storage and display, recording and control requirements.
What is a current sensor?
A current sensor is a detection device that can sense the information of the measured current, and can transform the sensed information into electrical signals that meet certain standards or other required forms of information output according to certain rules to meet the needs of Requirements for the transmission, processing, storage, display, recording and control of information.
Current sensors, also known as magnetic sensors, can be used in household appliances, smart grids, electric vehicles, wind power generation, etc. Many magnetic sensors are used in our lives, such as computer hard drives, compasses, household appliances and so on.
What are the classifications of current sensors?
According to different measurement principles, current sensors can be mainly divided into: shunts, electromagnetic current transformers, electronic current transformers, etc.
Electronic current transformers include Hall current sensors, Rogowski current sensors, and AnyWay variable frequency power sensors (which can be used for voltage, current and power measurement) dedicated to variable frequency power measurement.
Compared with electromagnetic current sensors, electronic current transformers have no ferromagnetic saturation, wide transmission frequency, small secondary load capacity, small size and light weight, which are the development direction of current sensors in the future.
Optical fiber current sensor is a new type of current sensor based on Faraday magneto-optical effect and using optical fiber as medium.
When linearly polarized light propagates in a medium, if a strong magnetic field is added parallel to the propagation direction of the light, 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, That is, ψ=V*B*l, and the proportionality coefficient V is called the Verdet constant, which is related to the properties of the medium and the frequency of the light wave. The deflection direction depends on the properties of the medium and the direction of the magnetic field. The above phenomenon is called the Faraday effect. Discovered by M. Faraday in 1845.
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