RU62713U1 - INFORMATION AND MEASURING DEVICE FOR MAGNETIC FIELD AND ELECTRIC CURRENT CONTROL - Google Patents

Abstract

The utility model relates to information-measuring equipment, namely to fiber-optic measuring and control devices, and can be used for measurement and control of magnetic fields and electric currents.

The task to which the utility model is directed is to increase the accuracy of measurements.

The problem is solved due to the fact that the PIC microcontroller is connected in series with the photodetector in the information-measuring device for controlling the magnetic field and electric current containing an optical radiation source, a fiber light guide, a polarizer, a Faraday magneto-optical cell, an analyzer and a photodetector, in contrast to the prototype containing I / O ports, a computing unit, an amplifier, an analog-to-digital converter, a sampling device is connected to the output of the PIC microcontroller eniya information and a recording device.

Description

The utility model relates to information-measuring equipment, namely to fiber-optic measuring and control devices, and can be used for measurement and control of magnetic fields and electric currents.

The prototype is an information-measuring device for monitoring the magnetic field and electric current (RU patent No. 2213356, class G01R 29/00, 2003), which contains an optical radiation source connected to the polarizer via a fiber optic fiber, a Faraday magneto-optical cell, an analyzer, and a photodetector. The increase in temperature stability in the prototype compared to the analogue is ensured by the fact that the angle between the optical axes of the polarizer and the analyzer is selected depending on the length of the Faraday magneto-optical cell made in the form of an optically active crystal.

The disadvantage of this device is that the Verdet constant, characteristic of each specific magneto-optical material, also called specific magnetic rotation, depends on temperature, and even more on the length of the light wave. As a result, this leads to measurement error, that is, to a decrease in accuracy.

The task to which the utility model is directed is to increase the accuracy of measurements.

The problem is solved in that in the information-measuring device for monitoring the magnetic field and electric current, containing a source of optical radiation, a fiber light guide, a polarizer, a Faraday magneto-optical cell, an analyzer and

a photodetector, in contrast to the prototype, a PIC microcontroller containing input / output ports, a computing unit, an amplifier, an analog-to-digital converter is connected in series with the photodetector, an information display device and a recording device are connected to the output of the PIC microcontroller.

Figure 1 shows the structural diagram of the inventive information-measuring device for monitoring the magnetic field and electric current, where 1 is a source of optical radiation (laser or laser diode), 2 is a fiber light guide, 3 is a polarizer, 4 is a Faraday magneto-optical cell, 5 is an analyzer 6 is a photodetector (photodiode), 7 is a PIC microcontroller, 8 is an information display device, 9 is a recording device.

Figure 2 shows the round bus 1 with the measured current I, the directions of the current I and the light flux Φ in the magneto-optical Faraday cell 2 and the picture of the magnetic field around the bus with current are indicated.

The inventive device operates as follows.

When the light emitted by the laser diode 1 passes through the polarizer 2 (Fig. 1), it becomes plane-polarized.

When the electric current I flows along conductor 1 (Fig. 2), a magnetic field is created around it, the intensity of which is determined by the law of the total current as

where R is the distance from the current conductor to the point in question.

Under the influence of a magnetic field, the intensity vector of which N coincides with the direction of plane-polarized light in the Faraday magneto-optical cell, the plane of polarization rotates by an angle

where L is the path length of light in the Faraday magneto-optical cell.

In the analyzer 5 (Fig. 1), the angle of rotation of the plane of polarization of the plane-polarized beam φ is converted into a change in the power of the optical signal

where P ₀ is the power of light in the absence of a magnetic field.

The optical signal from the output of the analyzer enters the photodiode 6 (Fig. 1), and then in the form of an electric signal to the PIC microcontroller 7, which contains input / output ports, a computational unit in which the influence of temperature and the light wavelength is taken into account, an amplifier, analog digital converter. The data from the output of the PIC microcontroller 7 can be displayed on the information display device 8, and stored in the recording device 9.

Thus, the proposed information-measuring device of the magnetic field and electric current differs from the similar ones in the ability to save and display the measurement results, as well as in increased measurement accuracy, due to the fact that the influence of temperature and light wavelength is taken into account in the computing unit of the PIC microcontroller.

Claims (1)

An information-measuring device for monitoring the magnetic field and electric current, containing an optical radiation source, a fiber light guide, a polarizer, a Faraday magneto-optical cell, an analyzer and a photodetector, characterized in that a PIC microcontroller containing input / output ports is connected in series with the photodetector unit, amplifier, analog-to-digital converter, an information display device and a recording device are connected to the output of the PIC microcontroller.