CN103698583A - Flake film pasting optical current sensor - Google Patents

Abstract

The invention discloses a flake film pasting optical current sensor, belongs to the field of optical measuring and aims to solve the problem that the optical current sensor has low suitability and increased cost as the measuring flexibility is improved by relying on the existing mode of increasing the length of optical glass. The flake film pasting optical current sensor comprises a light source, a first polarizing film, a flake film pasting sensor, a second polarizing film and a photoelectric detector; the flake film pasting sensor comprises a first film, transparent substrate glass and a second film; the first film and the second film are respectively attached to two light passing surfaces of the substrate glass; light beams emitted from the light source are transmitted by the first polarizing film to form rear polarized light which is incident to the flake film pasting sensor, the polarized light incident to the flake film pasting sensor passes though the first film, the transparent substrate glass and the second film in sequence, light passing through the second film is incident to the second polarizing film, and the polarized light passing through the second polarizing film is incident to the photoelectric sensor. The flake film pasting optical current sensor is suitable for measuring the current in a magnetic field effect.

Description

Thin Film Mount Optical Current Sensor

technical field

The invention relates to an optical current transformer and belongs to the field of optical measurement.

Background technique

Compared with the traditional electromagnetic transformer, the current optical current sensor has a large reduction in volume and weight. However, due to the small optical rotation coefficient of the diamagnetic optical glass used in the current optical current sensor, the measurement sensitivity has to be improved by increasing the length of the optical glass. The disadvantage of this structural sensor is that the increase in the length of the optical glass leads to an increase in the volume of the sensor, and the advantage of the miniaturization of the optical current sensor is not fully utilized, which reduces the applicability and increases the cost of the existing optical current sensor.

Contents of the invention

The object of the present invention is to solve the problems of low applicability and increased cost of existing optical current sensors that rely on increasing the length of optical glass to improve measurement sensitivity. The present invention provides a thin film-mounted optical current sensor.

The thin-film-mounted optical current sensor of the present invention comprises a light source, a first polarizer, a thin-film-mounted sensor, a second polarizer and a photodetector; the thin-film-mounted sensor includes a first film, a transparent substrate glass and a second The film, the first film and the second film are attached to the two light-transmitting surfaces of the base glass respectively; the light beam emitted by the light source is transmitted by the first polarizer and the polarized light is incident on the film-attached sensor, and then incident on the film-attached sensor. The polarized light of the type sensor passes through the first film, the transparent base glass and the second film in sequence, the light passing through the second film enters the second polarizer, and the polarized light passing through the second polarizer enters the photodetector.

Both the first thin film and the second thin film are optical material thin films with high Faraday optical rotation coefficient.

The first film is a stack of multiple films, and the second film is a stack of multiple films.

Beneficial effects of the present invention: the sheet-mounted film-type sensor of the present invention is made of a piece of ordinary transparent glass as a substrate, and an optical material film with a high Faraday rotation coefficient is attached in the direction of light transmission. The magneto-optical effect is generated under the action of the magnetic field generated by the current, and the angle of the polarization plane is deflected. The modulated light beam is transmitted through the second polarizer, and finally incident on the light input end of the photodetector. The thickness of the transparent base glass 4 of the thin-film-attached sensor can be processed according to needs, so that the length of the base glass can be reduced under the premise of ensuring a certain sensitivity of the optical sensor of the present invention, thereby reducing the volume and saving the cost , and is more applicable than the existing ones. In addition, the structure of the first thin film 7 and the second thin film 8 facilitates the adjustment of optical sensitivity by increasing the number of thin films, so this optical sensor also has the characteristics of flexible structure. The length of the base glass of the present invention is reduced by 50% compared with that of the existing sheet-mounted film type optical current sensor.

Description of drawings

FIG. 1 is a schematic diagram of the principle of the thin film-mounted optical current sensor described in the first embodiment.

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1. The thin-film-mounted optical current sensor described in this embodiment includes a light source 1, a first polarizer 2, a thin-film-type sensor, a second polarizer 5, and a photoelectric detector. device 6; the sheet film-attached sensor includes a first film 7, a transparent base glass 4 and a second film 8, and the first film 7 and the second film 8 are respectively attached to two light-transmitting surfaces of the base glass 4; The polarized light of the light beam emitted by the light source 1 transmitted through the first polarizer 2 enters the film-mounted sensor, and the polarized light incident on the film-mounted sensor passes through the first film 7, the transparent base glass 4 and the second film in sequence. 8. The light passing through the second film 8 enters the second polarizer 5 , and the polarized light passing through the second polarizer 5 enters the photodetector 6 .

The sheet-mounted film-type sensor of the present invention is made of a piece of common transparent glass as the substrate, and the first film 7 and the second film 8 are attached in the direction of light transmission. Under the magneto-optical effect, the angle of its polarization plane is deflected. The modulated light beam is transmitted through the second polarizer, and finally incident on the light input end of the photodetector. The working principle of this embodiment is to use the Faraday magneto-optical effect, which means that when linearly polarized light passes through a magneto-optical material, the polarization plane of the polarized light is rotated under the action of an external magnetic field along the light propagation direction. The rotation angle of the polarization plane is related to the magnitude of the applied magnetic field, and since the magnitude of the applied magnetic field directly depends on the current to be measured, the value of the current to be measured can be measured through the rotation angle of the polarized light. The magneto-optical effect described in this embodiment is generated in the thin film of the magneto-optic material on the surface of the transparent base glass 4 .

Embodiment 2: This embodiment is a further limitation of the sheet-mounted film-type optical current sensor described in Embodiment 1. Both the first film 7 and the second film 8 are optical material films with high Faraday rotation coefficients.

The materials of the first thin film 7 and the second thin film 8 both have high optical rotation coefficients, and can be attached to the surface of transparent glass after being made into thin films. The transparent base glass 4 has good light transmittance, is easy to process, and can be processed into thin slices according to needs, and the thickness of the thin slices is 0.5mm-5mm.

Specific Embodiment 3: This embodiment is a further limitation of the sheet-mounted film-type optical current sensor described in Specific Embodiment 1. The first film 7 is a stack of multiple films, and the second film 8 is a stack of multiple films. .

In this embodiment, on the basis of determining the thicknesses of the first thin film 7 and the second thin film 8 , the sensitivity of the optical current sensor can be further increased through the number of thin films, so as to meet actual needs.

Claims (3)

1. A sheet-mounted film-type optical current sensor, characterized in that, It includes a light source (1), a first polarizer (2), a thin film sensor, a second polarizer (5) and a photodetector (6); The film-attached sensor includes a first film (7), a transparent base glass (4) and a second film (8), and the first film (7) and the second film (8) are respectively attached to the base glass (4 ) on both clear surfaces; The light beam emitted by the light source (1) passes through the first polarizer (2) and the polarized light is incident on the film-mounted sensor, and the polarized light incident on the film-mounted sensor passes through the first film (7), the transparent substrate in sequence The glass (4) and the second film (8), the light passing through the second film (8) enters the second polarizer (5), and the polarized light passing through the second polarizer (5) enters the photodetector ( 6). 2 . The sheet-mounted film-type optical current sensor according to claim 1 , characterized in that, both the first film ( 7 ) and the second film ( 8 ) are optical material films with a high Faraday rotation coefficient. 3 . 3. The thin film-mounted optical current sensor according to claim 1, characterized in that, the first thin film (7) is a stack of multiple thin films, and the second thin film (8) is a stack of multiple thin films.

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