CN210894572U

CN210894572U - Power grid monitoring ultraviolet camera and power grid electric spark discharge point remote detection system

Info

Publication number: CN210894572U
Application number: CN201920913204.2U
Authority: CN
Inventors: 杨勇; 宋瑛林; 储祥勇; 杨俊义
Original assignee: Suzhou Micronano Laser Photon Technology Co ltd
Current assignee: Suzhou Micronano Laser Photon Technology Co ltd
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-06-30
Anticipated expiration: 2029-06-18

Abstract

The utility model belongs to weak optical signal surveys the field, for the weak ultraviolet signal of surveying electric wire netting electric spark under strong sunlight condition, improves and surveys the reliability, improves sensitivity of measurement, provides an electric wire netting control ultraviolet camera and electric wire netting electric spark point of discharge remote monitering system. Dividing incident light into two paths by using a total-reflection total-lens A, arranging a visible light imaging light path on the transmission light path, and imaging the visible light on a visible light CCD after the visible light passes through a visible light imaging objective lens; ultraviolet light is reflected, an ultraviolet light imaging light path is arranged on the reflected light path, the ultraviolet light is incident to a full-reflection full-lens B, residual visible light in the ultraviolet light path transmits out of the ultraviolet light imaging light path from the full-reflection full-lens B, the ultraviolet light reflected by the full-reflection full-lens B is imaged on an ultraviolet solar blind CCD after passing through an ultraviolet imaging objective, and the ultraviolet channel signals are subjected to pixel level fusion through the image fusion system; the detection sensitivity of solar blind signals is improved under the condition of high background light intensity.

Description

Power grid monitoring ultraviolet camera and power grid electric spark discharge point remote detection system

Technical Field

The utility model belongs to a weak optical signal surveys the field, concretely relates to accuse ultraviolet camera can remotely shoot weak solar blind ultraviolet signal under the strong background light condition.

Background

With the increasing use of electric quantity of human beings, electric energy becomes an essential part of daily life, which puts higher and higher requirements on the power supply requirement of electric energy, and uninterrupted power supply is also one of important factors for measuring the quality of electric energy. Therefore, the power grid sudden accident can be reduced by detecting the uninterrupted power supply of the power grid and finding the hidden defect of the power grid as soon as possible. The method for detecting the power grid defects by using the imaging method has the advantages of intuition, easiness in judgment of fault points and the like, at present, infrared imaging is widely applied to power grid defect detection, but infrared detection mainly aims at thermal signals, and faults are often formed when defects are found by infrared. And the potential fault point can be found early through ultraviolet signal detection, and the potential fault point can be found early when a fault is formed through monitoring of an early discharge point. However, early discharge signals are often very weak, and inspection of a high-voltage line requires a long detection distance, which has high requirements on the sensitivity of a detector and the narrow-band transmittance of an optical filter. The background light outside the solar blind band is prevented from entering the ultraviolet detector, the signal-to-noise ratio can be greatly increased, and the influence of interference signals on the test result is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem be: the traditional monitoring camera is difficult to detect the electric spark discharge point of the power grid under the background of strong sunlight, and provides the power grid monitoring ultraviolet camera for improving the detection reliability and the measurement sensitivity.

A power grid monitoring ultraviolet camera comprises a camera body and an optical system, wherein the optical system is arranged on the camera body; characterized in that the optical system is arranged as follows: the incident light is divided into a visible light imaging light path and an ultraviolet light imaging light path after passing through the obliquely placed full-reflecting full-lens A; the visible light imaging optical path is sequentially provided with a visible light imaging objective lens and a visible light CCD; the ultraviolet light imaging light path is sequentially provided with: a total reflection full lens B, an ultraviolet imaging objective lens and an ultraviolet solar blind CCD; the visible light CCD and the ultraviolet solar blind CCD transmit images to an image processing system.

The working principle is as follows: incident light is transmitted through the obliquely arranged full-reflecting full-lens A, a visible light imaging light path is arranged on the transmission light path, and the visible light is imaged on a visible light CCD after passing through a visible light imaging objective lens; ultraviolet light is reflected, the ultraviolet light imaging light path is arranged on the reflected light path, the ultraviolet light is incident to the total-reflection total-lens B, the residual visible light in the ultraviolet light path is transmitted out of the ultraviolet light imaging light path from the total-reflection total-lens B, the ultraviolet light reflected by the total-reflection total-lens B passes through an ultraviolet imaging objective and then is imaged on an ultraviolet solar blind CCD, and the ultraviolet channel signals are subjected to filtering, zooming, translating and other processing through the image fusion system, so that the visible and ultraviolet channel signals are fused at a pixel level. The signal light (weak ultraviolet signal) and the background light (visible sunlight) are incident into the ultraviolet imaging system, through the total-reflection lens, the visible reflection solar blind light signal is improved by two orders of magnitude compared with the background light intensity, the intensity of the signal light is improved again relative to the background light through the secondary reflection, and through the two-time reflection, the signal light is not basically attenuated due to the high reflectivity of the solar blind waveband, and the background light is attenuated by 4 orders of magnitude. The detection sensitivity of solar blind signals is improved under the condition of high background light intensity.

The more preferable scheme in the scheme is as follows: a filter lens group is arranged on a reflection light path of incident light passing through the obliquely arranged full-reflection full lens A, and the rear end of the filter lens group is provided with the ultraviolet light imaging light path. The filtering lens group can well block the influence of stray incident light on ultraviolet signals.

The filter lens group is composed of a filter lens A, a filter pore and a filter lens B in sequence along the light propagation direction; wherein: the filtering aperture is arranged at the image space focus of the filtering lens A, and the image space focus of the filtering lens A is superposed with the object space focus of the filtering lens B. The filtering lens A and the filtering lens B form a 4f filtering system, a filtering small hole is arranged at the confocal position of the filtering lens A and used for blocking stray signals, and the size of the small hole can be determined according to the imaging angle of the ultraviolet imaging lens. The reflected light passing through the 4f filtering system is split again by a total reflection total lens, and the direction of the signal light is changed simultaneously, so that the signal light is parallel to the incident light. The incident angle of the received incident light can be adjusted by changing the size of the filtering small hole.

And a solar blind optical filter is arranged at the front end of the ultraviolet solar blind CCD.

Compared with other ultraviolet imagers, the method has the following advantages:

the invention realizes the detection of weak ultraviolet signals under the condition of strong background light, and the detection sensitivity of the weak signals is greatly improved.

The invention adopts twice reflection light paths, and through the light path turning design, the design structure of the instrument is more reasonable, and the length in one direction is effectively shortened.

The method can realize clear imaging of the remote weak electric arc under strong sunlight, and is less interfered by the background.

Drawings

FIG. 1 is a schematic diagram of an optical system;

FIG. 2 is a visible light CCD shooting visible light image;

FIG. 3 is a solar blind ultraviolet CCD shooting solar blind ultraviolet image;

FIG. 4 is a visible UV fused image;

wherein: 1. the system comprises a total-reflection total-lens A, a visible light imaging objective lens, a visible light CCD (charge coupled device), a 4, an image processing system, a5, filter lenses A and 6, filter lenses B and 7, total-reflection total-lens B and 8, an ultraviolet imaging objective lens, a 9, a solar blind optical filter, a 10, an ultraviolet solar blind CCD, a 11, a small filter hole, a 12 and a display screen.

Detailed Description

For a more clear explanation of the invention, reference is made to the following description, taken in conjunction with the accompanying drawings and examples:

the first embodiment is as follows:

as shown in fig. 1, an electric network monitoring ultraviolet camera comprises a camera body and an optical system, wherein the optical system is mounted on the camera body; characterized in that the optical system is arranged as follows: the incident light is divided into a visible light imaging light path and an ultraviolet light imaging light path after passing through an obliquely arranged full-reflecting full-lens A1; wherein the visible light imaging light path is sequentially set as follows: a visible light imaging objective lens 2, a visible light CCD 3; the ultraviolet imaging light path is sequentially provided with a filter lens group, a total reflection full lens B7, an ultraviolet imaging objective lens 8, a solar blind optical filter 9 and an ultraviolet solar blind CCD 10; the visible light CCD and the ultraviolet solar blind CCD transmit images to the image processing system 4; the visible light image and the ultraviolet signal light are filtered and fused through the image processing system, and the image is displayed on the display screen 12 after being fused by the image processor 4; the filter lens group consists of a filter lens A5, a filter pinhole 11 and a filter lens B6 in sequence along the light propagation direction; wherein: the filtering aperture is arranged at the image space focus of the filtering lens A, and the image space focus of the filtering lens A is superposed with the object space focus of the filtering lens B.

It is worth mentioning that: the letters "a" and "B" in the full-reflective full lens a, the full-reflective full lens B, the filter lens a, and the filter lens B do not refer to specific models or specifications, are numbers only used for distinguishing a plurality of components, and are expressed by replacing a first full-reflective full lens, a second full-reflective full lens, a first filter lens, and a second filter lens correspondingly.

The solar blind ultraviolet signal light and the background light are incident into the full-reflection full-lens A, the visible background light passes through the visible light imaging objective lens after passing through the full-reflection full-lens, the visible light passing through the visible light imaging objective lens is imaged on a visible light CCD target surface, taking the shooting power grid target shown in figure 2 as an example, the solar blind ultraviolet signal is reflected by the full-reflection full-lens B and passes through a filter system composed of a filter lens A and a filter lens B, a filter small hole is arranged at the common focus of the filter lens A and the filter lens B, and the size of the small hole is adjusted according to the imaging angle of the solar blind ultraviolet camera. Ultraviolet signals are incident to the full-reflection full-lens B, most of residual visible light penetrates through the full-reflection full-lens B, solar blind ultraviolet signals are reflected by the full-reflection full-lens B and then are incident to the ultraviolet solar blind CCD through the ultraviolet imaging lens to be imaged, a shooting power grid target shown in fig. 3 is taken as an example, and an arrow indicates ultraviolet imaging of an electric spark discharge point. The visible light CCD and the ultraviolet solar blind CCD are coaxial light paths, the imaging ranges are the same, the visible light image and the ultraviolet signal light are filtered and fused through an image processing system, and the fused image is shown in figure 4. The total-reflection full-lens A and the total-reflection full-lens B are totally transparent to visible light, the transmittance is greater than 90%, and the reflectivity is greater than 95% for solar blind ultraviolet signals within the range of 240 plus one wavelength and 280 nm. The background visible light is transmitted twice, the light intensity reaching the ultraviolet channel is greatly reduced, and the signal intensity of the solar blind band signal light is not greatly reduced after the signal light is reflected twice. From fig. 4, the electric spark discharge point of the power grid can be quickly positioned, the electric spark discharge of the power grid has very large destructiveness to the power grid, and the abnormal point can be locked before the electric spark discharge of the power grid occurs through the analysis of the ultraviolet imaging of the power grid, so that effective fault prevention is achieved.

Example two:

a remote detection system for electric spark discharge points of a power grid comprises an electric spark monitoring ultraviolet camera, a wireless transmitter and a remote receiver; the power grid monitoring ultraviolet camera transmits the acquired image to the image processing system and then transmits the image to the remote receiver through the wireless transmitter. When the device is used, a plurality of power grid monitoring ultraviolet cameras can be arranged along a target power grid, when electric spark discharge occurs at a certain position of a circuit, the ultraviolet cameras identify a discharge point, images collected by the ultraviolet solar-blind CCD and the visible light CCD are fused in real time and received by the remote receiver, and when the local ultraviolet signals on the collected images are found to be abnormally increased, the electric spark discharge position can be quickly positioned.

Acquiring a signal of a target power grid by using the power grid electric spark discharge point remote detection system; and analyzing the fused image in the image processing system to obtain the position of the electric spark discharge point. Clear signals can be obtained even in the environment with strong sunlight, and the technical problems that the traditional infrared monitoring interference signals are strong, real-time monitoring is difficult to realize, and early warning cannot be realized are solved.

Claims

1. A power grid monitoring ultraviolet camera comprises a camera body and an optical system, wherein the optical system is arranged on the camera body; characterized in that the optical system is arranged as follows: the incident light is divided into a visible light imaging light path and an ultraviolet light imaging light path after passing through the obliquely placed full-reflecting full-lens A; the visible light imaging optical path is sequentially provided with a visible light imaging objective lens and a visible light CCD; the ultraviolet light imaging light path is sequentially provided with: a total reflection full lens B, an ultraviolet imaging objective lens and an ultraviolet solar blind CCD; the visible light CCD and the ultraviolet solar blind CCD transmit images to an image processing system.

2. The ultraviolet camera for monitoring power grid according to claim 1, wherein: a filter lens group is arranged on a reflection light path of incident light passing through the obliquely arranged full-reflection full lens A, and the rear end of the filter lens group is provided with the ultraviolet light imaging light path.

3. The ultraviolet camera for monitoring power grid according to claim 2, wherein: the filtering lens group consists of a filtering lens A, a filtering small hole and a filtering lens B in sequence along the light propagation direction; wherein: the filtering aperture is arranged at the image space focus of the filtering lens A, and the image space focus of the filtering lens A is superposed with the object space focus of the filtering lens B.

4. The ultraviolet camera for monitoring power grid according to claim 3, wherein: the front end of the ultraviolet solar blind CCD is provided with a solar blind optical filter.

5. A power grid electric spark discharge point remote detection system is characterized in that: a power grid monitoring ultraviolet camera comprising one of the claims 1 to 4, a wireless transmitter, a remote receiver; the power grid monitoring ultraviolet camera transmits the acquired image to the image processing system and then transmits the image to the remote receiver through the wireless transmitter.