Electromagnetic environment monitoring device

Abstract

The utility model discloses an electromagnetic environment monitoring device, which comprises a probe device, and the probe device comprises an optical fiber, a collimator, an electro-optical crystal sensor and an optical fiber which are sequentially connected in series. In the utility model, the optical fiber, the collimator and the electro-optical crystal sensor form a probe device, the laser is transmitted to the collimator through the optical fiber, the polarization state of the laser penetrating through the electro-optical crystal sensor can be changed due to the magnetic field, and the laser is easily saturated under normal conditions due to the high-frequency domain magnetic field; and the collimator can reduce the saturation degree of the laser entering the electro-optical crystal, so that a broadband magnetic field can be measured, and the high-frequency measurement range can reach more than 1MHz.

Description

TECHNICAL FIELD

[0001] The utility model relates to high voltage application technical field more particularly related to a kind of electromagnetic environment monitoring devices. BACKGROUND

[0002] Electromagnetic environment measuring device is influenced by environmental conditions, and the measurement result is prone to deviation. With the significant increase in AC-DC mixed electric field, multiple harmonic electric field and transient electric field, the electric field presents more and more characteristics of wide frequency domain with multiple forms and multiple frequencies. The equivalent frequency covers the requirements from DC to MHz. The power dispatching and operation department attaches great importance to the research and measurement results of electric field sensors in strong electric field range and wide measurement frequency band. In the power industry, magnetic field detection is often used to detect and calculate the size of line current. The international community pays more attention to the measurement of magnetic field environment. When new important equipment or infrastructure is added, the magnetic field environment needs to be measured. The existing magnetic field measurement principle changes the electric field distribution inside the crystal through the dielectric polarization effect of the electro-optic crystal, which affects the beam phase shift. Although it has good performance, it still faces challenges in sensitivity, resolution, noise suppression and stability. SUMMARY

[0003] The technical problem to be solved by the utility model is how to measure wideband magnetic field.

[0004] The utility model solves the above technical problems by the following technical means: an electromagnetic environment monitoring device, comprising a probe device, the probe device comprises optical fiber, collimator, electro-optic crystal sensor and optical fiber connected in sequence.

[0005] As a preferred technical solution, it further comprises a shell and a probe fixing frame, the shell is fixedly connected with the probe fixing frame at both ends, and the shell and the probe fixing frame are both provided with a groove matched with the probe device.

[0006] As a preferred technical solution, the optical fiber at one end of the electro-optic crystal sensor is fixedly connected with one of the probe fixing frames by potting glue, and the optical fiber at the other end of the electro-optic crystal sensor is fixedly connected with the other probe fixing frame by potting glue.

[0007] As a preferred technical solution, the two optical fibers are fixedly connected with the probe fixing frame by potting glue.

[0008] As a preferred technical solution, the probe fixing frame comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected with the shell through the second connecting part, the diameter of the first connecting part is smaller than that of the shell, and the diameter of the second connecting part is the same as that of the first connecting part at one end and the same as that of the shell at the other end.

[0009] As a preferred technical scheme, the probe fixing frame is fixedly connected with the shell through buckling.

[0010] As a preferred technical scheme, the shell thickness is less than or equal to 2.36 mm.

[0011] As a preferred technical scheme, the potting adhesive is epoxy resin adhesive, and the shell and the probe fixing frame are made of polyphenylene sulfide material.

[0012] As a preferred technical scheme, the groove is a cuboid structure, and the cross section is rectangular or rectangular.

[0013] As a preferred technical scheme, the optical fiber and the collimator are connected through optical cement.

[0014] The beneficial effects of the utility model lie in:

[0015] (1) in the utility model, the probe device is composed of an optical fiber, a collimator and an electro-optic crystal sensor, laser is transmitted to the collimator through the optical fiber, the magnetic field can cause the polarization state of the laser transmitted in the electro-optic crystal sensor to change, under normal circumstances, the high-frequency magnetic field can easily saturate the laser, and the collimator can reduce the saturation degree of the laser entering the electro-optic crystal, so that the wideband magnetic field can be measured, and the high-frequency measurement range can reach more than 1 MHz.

[0016] (2) in the utility model, the epoxy resin adhesive is used for packaging, and the shell and the probe fixing frame are made of polyphenylene sulfide material, so that the interference of the stray field can be reduced, the noise can be reduced, and the sensitivity can be improved, thereby effectively solving the problem of insufficient measurement sensitivity of the current optical fiber voltage sensor under the voltage reflection of the electromagnetic environment fault, and improving the reliability of the magnetic field measurement result. DRAWINGS

[0017] Figure 1 The utility model provides a front view structural schematic diagram for embodiment;

[0018] Figure 2 The utility model provides a shell internal structure schematic diagram for embodiment;

[0019] Figure 3 The utility model provides a side view structural schematic diagram for embodiment;

[0020] Drawing reference: 1, shell, 2, recess, 3, probe fixing frame, 4, probe device, 41, optical fiber, 42, collimator, 43, electro-optic crystal sensor. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] See Figure 1 , Figure 2 An electromagnetic environment monitoring device includes a housing 1, a groove 2, a probe mounting bracket 3, and a probe device 4. The probe mounting bracket 3 is fixedly connected to both ends of the housing 1. The housing 1 and the probe mounting bracket 3 are fixed by snap-fit. A through groove 2 is provided inside the housing 1 and the probe mounting bracket 3 for placing the probe device 4. The probe device 4 includes an optical fiber 41, a collimator 42, an electro-optic crystal sensor 43, and an optical fiber 41 arranged in series along the axial direction of the groove 2. The electro-optic crystal sensor 43 is adapted to the size of the groove 2. The optical fiber 41 and the collimator 42 are connected by UV adhesive. The optical fiber 41 and the collimator 42 are bonded and fixed to one probe mounting bracket 3 by potting compound and encapsulated. The other optical fiber 41 is bonded and fixed to another probe mounting bracket 3 by potting compound and encapsulated.

[0023] The crystal inside the electro-optic crystal sensor 43 is an LBO nonlinear crystal, which can sense the measured voltage and convert it into a usable output signal. The electro-optic crystal sensor 43 is a commercially available component. The probe device 4, composed of optical fiber 41, collimator 42, and electro-optic crystal sensor 43, can measure a wide-band magnetic field, with a high-frequency measurement range of over 1MHz. The laser is transmitted through optical fiber 41 to collimator 42. If there is a magnetic field in the surrounding area, the polarization state of the laser transmitted into the electro-optic crystal sensor 43 will change, thus the magnetic field can be measured. Under normal circumstances, high-frequency magnetic fields can easily saturate the laser. Collimator 42 can reduce the saturation degree of the laser entering the electro-optic crystal, thus enabling the measurement of a wide-band magnetic field. This can promote the application of electro-optic inductive sensing technology in the fields of electromagnetic environment and transient electromagnetic process monitoring, power equipment operation status assessment, etc., and accelerate the development of electromagnetic environment monitoring and power equipment condition monitoring levels. It is of great significance for improving the technological level of traditional industries and driving technological innovation in related domestic research, design, manufacturing, and construction enterprises.

[0024] See Figure 1The shell 1 and the probe fixing frame 3 are made of polyphenylene sulfide, and the filling glue is epoxy resin glue, the shell 1 and the probe fixing frame 3 are packaged by using epoxy resin glue, and the shell 1 and the probe fixing frame 3 are made of polyphenylene sulfide, so that the interference of the stray field is reduced, the noise is reduced, and the sensitivity is improved, thereby effectively solving the problem of insufficient measurement sensitivity of the current optical fiber voltage sensor under the voltage reflection of the traveling wave in the electromagnetic environment failure, and improving the reliability of the magnetic field measurement result.

[0025] The probe fixing frame 3 comprises a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected with the shell 1 through the second connecting portion, the diameter of the first connecting portion is smaller than the diameter of the shell 1, one end of the second connecting portion is the same as the diameter of the first connecting portion, and the other end of the second connecting portion is the same as the diameter of the shell 1, and the second connecting portion is circumferentially formed with a transition surface.

[0026] Referring to Figure 3 The groove 2 in the embodiment is a cuboid structure, and the cross section is a quadrilateral, which can be a rectangle or a square, the thickness of the shell 1 is not more than 2.36 mm, and in the embodiment, the thickness of the shell 1 is taken as an example, and the thickness of the shell 1 is thicker, so that the laser is prevented from being affected by the magnetic field during transmission in the electro-optic crystal, thereby affecting the measurement accuracy.

[0027] The above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. An electromagnetic environment monitoring device, characterized by, The probe device comprises optical fibers, collimators, electro-optic crystal sensors and optical fibers connected in sequence.

2. An electromagnetic environment monitoring device according to claim 1, characterised in that, The housing is fixedly connected with probe fixing frames at both ends, and the housing and the probe fixing frames are provided with grooves matched with the probe device.

3. An electromagnetic environment monitoring device according to claim 2, characterised in that, The optical fiber at one end of the electro-optic crystal sensor is fixedly connected with one of the probe fixing frames by the potting glue, and the optical fiber at the other end of the electro-optic crystal sensor is fixedly connected with the other probe fixing frame by the potting glue.

4. An electromagnetic environment monitoring device according to claim 3, characterised in that, The two optical fibers are fixedly connected with the probe fixing frames by the potting glue.

5. The electromagnetic environment monitoring device of claim 2, wherein, The probe fixing frame comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected with the housing through the second connecting part, the diameter of the first connecting part is smaller than the diameter of the housing, and the diameter of one end of the second connecting part is the same as that of the first connecting part, and the diameter of the other end of the second connecting part is the same as that of the housing.

6. The electromagnetic environment monitoring device of claim 2, wherein, The probe fixing frame is fixedly connected with the housing by buckling.

7. The electromagnetic environment monitoring device of claim 2, wherein, The thickness of the housing is less than or equal to 2.36 mm.

8. The electromagnetic environment monitoring device of claim 3, wherein, The potting glue is epoxy resin glue, and the housing and the probe fixing frame are made of polyphenylene sulfide.

9. The electromagnetic environment monitoring device of claim 2, wherein, The groove has a cuboid structure and a rectangular or oblong cross section.

10. The electromagnetic environment monitoring device of claim 1, wherein, The optical fiber is connected with the collimator by optical glue.

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