CN102323521B - Helmet display - Google Patents

Abstract

The invention discloses a helmet-mounted display, which is applied to corona detection, comprising: an ultraviolet objective lens, used for taking in corona light signals; a solar-blind ultraviolet image intensifier connected with the ultraviolet objective lens, and the ultraviolet objective lens is imaged on the The detection surface of the solar-blind ultraviolet image intensifier; the ultraviolet filter between the ultraviolet objective lens and the solar-blind ultraviolet image intensifier; the optical fiber image bundle and the eyepiece; the beam splitter connected to the eyepiece, the The beam splitter has an included angle with the optical axis of the eyepiece, the light reflected by the beam splitter enters the human eye, and the virtual image of the corona seen by the human eye is located in the same direction as the corona. The device can detect the corona phenomenon in time, and the detection efficiency is high. The helmet-mounted display is easy to carry, has high accuracy, and is less affected by the external environment. It can also be worn at the same time during the maintenance of the power system, which greatly avoids power system loss.

Description

A helmet display

technical field

The invention relates to the manufacturing technology of the head-mounted display, in particular to a head-mounted display used for corona detection.

Background technique

In recent years, my country's economy has continued to develop at a high speed and steadily, and the scale of the power system has also continued to expand. With the implementation of my country's west-to-east power transmission plan, the transmission voltage level has gradually increased, and 500kV transmission lines and substations have been settled in various parts of the country. Ultra-high voltage Power transmission and transformation systems are widely used, and it is even more important to maintain their safe and reliable operation. Corona discharge will not only seriously affect personal and equipment safety, but also cause a large amount of power loss. Therefore, timely and accurate detection of the location and strength of corona discharge will facilitate the maintenance of the location of corona discharge and ensure the safety of the power system. It is of great significance to ensure reliable operation, prevent damage to electrical equipment and reduce personal injury.

The corona is generated because the uneven conductor produces an uneven electric field. Around the uneven electric field, near the electrode with a small curvature radius, when the voltage rises to a certain value, discharge will occur due to air dissociation, forming a corona . Because the electric field in the periphery of the corona is very weak, there is no collision and ionization, and the charged particles in the periphery of the corona are basically electric ions, and these ions form the corona discharge current. Simply put, a conductor electrode with a small radius of curvature discharges the air to generate a corona.

The corona discharge in the power system causes a large loss of electric energy, and the electromagnetic pulse generated by it will interfere with radio and high-frequency communication, cause edge effects on power equipment, damage insulators, and cause corrosion on the surface of the wire, reducing the service life of the wire. Therefore, only by discovering the location of corona discharge as early as possible can the faulty parts be repaired in time to reduce losses and avoid accidents.

Traditional power transmission and transformation line inspections mainly use far-infrared telescopes, infrared cameras or manual visual inspections. However, the target of corona discharge is small and weak, making visual observation difficult, and sunlight contains strong infrared rays. , the accuracy of observation with an infrared telescope is low, and the response speed is slow. It is difficult to detect the corona in time by using the above method, and then the power system cannot be maintained in time, resulting in unavoidable losses. For the above reasons, there is a need for a device that is convenient for detecting corona in time.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a helmet-mounted display, which is applied to the detection of corona. The impact on the power system is small, and it can also be worn at the same time during the maintenance of the power system, which greatly avoids the loss of the power system.

In order to solve the above problems, the embodiments of the present invention provide the following technical solutions:

A helmet-mounted display applied to corona detection, comprising:

Ultraviolet objective lens, used to pick up the light signal of corona;

A solar-blind ultraviolet image intensifier connected with the ultraviolet objective lens, and the ultraviolet objective lens is imaged on the detection surface of the solar-blind ultraviolet image intensifier;

An ultraviolet filter positioned between the ultraviolet objective lens and the solar-blind ultraviolet image intensifier;

An optical fiber image transmission bundle and an eyepiece, the input surface end of the optical fiber image transmission bundle is connected to the output surface of the solar-blind ultraviolet image intensifier, and its output surface end is connected to the eyepiece as the object surface of the eyepiece;

A beam splitter connected to the eyepiece, the beam splitter has an included angle with the optical axis of the eyepiece, the light reflected by the beam splitter enters the human eye, and the virtual image of the corona seen by the human eye and the corona in the same orientation, wherein the eyepiece and the eye are on the same side of the beamsplitter.

Preferably, the solar-blind ultraviolet image intensifier includes:

an ultraviolet detector connected to the ultraviolet objective lens, and the ultraviolet objective lens is imaged on the detection surface of the ultraviolet detector;

A low-light image intensifier, the input surface of the low-light image intensifier is connected with the output surface of the ultraviolet detector.

Preferably, the beam splitter and the optical axis of the eyepiece form an included angle of 30°-60°.

Preferably, the optical axis of the beam splitter and the eyepiece forms an included angle of 45°.

Preferably, the object distance of the ultraviolet objective lens is 0.3m-infinity.

Preferably, the image distance of the eyepiece is 0.3m-infinity.

Preferably, the object distance of the ultraviolet objective lens is 0.5m-infinity.

Preferably, the image distance of the eyepiece is 0.5m-infinity.

Preferably, the reflectance of the beam splitter is greater than the transmittance.

Compared with the prior art, the above-mentioned technical solution has the following advantages:

In the technical solution provided by the embodiment of the present invention, the helmet-mounted display is applied to the detection process of corona. The helmet-mounted display utilizes the "sunblindness" characteristic of ultraviolet light, adopts an ultraviolet objective lens to pick up the light signal of corona, passes through the ultraviolet filter Filter out the light signals of other bands except the solar-blind ultraviolet band, and then use the solar-blind ultraviolet image intensifier to spectrally convert and intensify the received corona light signal, and convert it into a visible light signal with strong light intensity , so that the human eye can observe the corona phenomenon, and then use the optical fiber image beam to convert the spectrum-converted and enhanced corona light signal through the eyepiece to form an enlarged virtual image, and then the light is reflected by the beam splitter into the human eye. At this time, The human eye will see a virtual image of the corona at the corona discharge.

Since the detection of corona is mainly carried out in the solar-blind ultraviolet band, it is less affected by external light, so the virtual image of corona can be clearly seen by the human eye, which improves the detection accuracy of corona, and because the helmet display itself is easy to carry, It only needs to be worn on the head, thus liberating the hands, and, due to the use of the beam splitter, the wearer can see the corona without affecting the normal vision, and the maintenance personnel can wear it at any time The helmet-mounted display is used for maintenance work, so that the corona phenomenon can be discovered in time and timely maintenance can be carried out, which greatly avoids the loss of the power system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a head-mounted display disclosed in an embodiment of the present invention.

Detailed ways

As mentioned in the background technology section, it is difficult to detect the corona phenomenon in time using the observation methods in the prior art. The inventors of the present invention have found that the reason for the above problems is that only a small amount of corona discharge can be generated in the initial stage. The amount of photons, that is, the luminous intensity is very weak, which makes it difficult to observe with the naked eye at the initial stage of corona discharge. When the corona discharge can be seen with the naked eye, the damage to electrical equipment is often serious. In addition, using infrared telescopes and infrared Although infrared devices such as cameras can also detect corona faults, due to the strong solar radiation, that is, the images detected by infrared devices contain a strong infrared background, which makes it difficult to detect corona phenomena in the infrared band. What the infrared device actually detects is the heating phenomenon. When the corona phenomenon is detected, the power line or equipment has been seriously damaged due to the corona.

In addition, the wavelength range of corona discharge is about 230nm-405nm, which includes the solar-blind ultraviolet band. The ozone layer strongly absorbs the ultraviolet band, that is to say, under the ozone layer, in the ultraviolet light radiated by the sun, the ultraviolet light in this band is almost completely absorbed, and the content is almost zero. This phenomenon is also called ultraviolet light. "Sunblindness" feature. Based on this, in the solar-blind ultraviolet band, since the ultraviolet radiation of the observation target is stronger than that of the sun, the observation target is easily displayed.

Based on the above reasons, the inventor considers that the "sunblindness" characteristic of the ultraviolet light of solar radiation can be used to design a corresponding detection system to detect and track the corona discharge phenomenon in time. At the same time, because the helmet detection system itself is easy to carry and other characteristics The inventor believes that the "solar blindness" characteristic of ultraviolet light can be used for reference in the helmet detection system, so as to observe the corona phenomenon in time.

Based on the above research, an embodiment of the present invention provides a head-mounted display applied to corona detection, including:

Ultraviolet objective lens, used to pick up the light signal of corona;

A solar-blind ultraviolet image intensifier connected with the ultraviolet objective lens, and the ultraviolet objective lens is imaged on the detection surface of the solar-blind ultraviolet image intensifier;

An ultraviolet filter positioned between the ultraviolet objective lens and the solar-blind ultraviolet image intensifier;

An optical fiber image transmission bundle and an eyepiece, the input surface end of the optical fiber image transmission bundle is connected to the output surface of the solar-blind ultraviolet image intensifier, and its output surface end is connected to the eyepiece as the object surface of the eyepiece;

A beam splitter connected to the eyepiece, the beam splitter has an included angle with the optical axis of the eyepiece, the light reflected by the beam splitter enters the human eye, and the virtual image of the corona seen by the human eye and the corona in the same direction.

The head-mounted display provided by the embodiment of the present invention utilizes the "sunblindness" characteristic of ultraviolet light, adopts an ultraviolet objective lens to capture the light signal of the corona, and filters out light in other bands except the sunblind ultraviolet band through an ultraviolet filter signal, and then use a sun-blind ultraviolet image intensifier to spectrally convert and intensify the light signal of the corona ingested, and convert it into a visible light signal with strong light intensity, so that the human eye can observe the corona phenomenon, and then use optical fiber The image beam converts the spectrum-converted and enhanced corona light signal through the eyepiece to form an enlarged virtual image, and then the light is reflected by the beam splitter into the human eye. At this time, the human eye will see the corona at the corona discharge. Virtual image.

Since the detection of corona is mainly carried out in the solar-blind ultraviolet band, it is less affected by external light, so the virtual image of corona can be clearly seen by the human eye, which improves the detection accuracy of corona, and because the helmet display itself is easy to carry, It only needs to be worn on the head, thus freeing hands, and, due to the use of the beam splitter, the wearer can see the corona virtual image without affecting the normal vision, and the maintenance personnel can wear it at any time The head-mounted display performs maintenance work, so that the corona phenomenon can be discovered in time and timely maintenance can be carried out, which greatly avoids the loss of the power system.

The above is the core idea of the present application. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention. rather than all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

Secondly, the present invention is described in detail in combination with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, and it should not be limited here. The protection scope of the present invention. In addition, the three-dimensional space dimensions of length, width and depth should be included in actual production.

The head-mounted display provided by the embodiment of the present invention can be applied to the detection process of corona, and its structural diagram is shown in Figure 1, including:

The ultraviolet objective lens 11 can image ultraviolet light, and is used to capture the light signal of the corona in this embodiment;

A solar-blind ultraviolet image intensifier connected with the ultraviolet objective lens 11, the ultraviolet objective lens 11 is imaged on the detection surface of the solar-blind ultraviolet image intensifier, and the solar-blind ultraviolet image intensifier can absorb the light of the corona The signal is spectrally converted and the intensity of the light signal is enhanced, and the light signal of the corona with a weaker light intensity is converted into a visible light signal with a stronger light intensity, so that the human eye can observe the corona discharge phenomenon;

The ultraviolet filter 12 between the ultraviolet objective lens 11 and the solar-blind ultraviolet image intensifier is used to filter out optical signals of other wavebands except the solar-blind ultraviolet waveband, and reduce the impact of optical signals of other wavebands on the detection result The influence of the light signal in the sun-blind ultraviolet band of the light signal of the corona is absorbed to the maximum extent, so as to facilitate subsequent processing;

An optical fiber image transmission bundle 15 and an eyepiece 16, the input surface end of the optical fiber image transmission bundle 15 is connected with the output surface of the solar-blind ultraviolet image intensifier, and its output surface end is connected with the eyepiece 16, as the eyepiece 16 The object plane of the optical fiber image transmission bundle 15 in this embodiment is used to transmit the optical signal after spectral conversion and enhancement by the solar-blind ultraviolet image intensifier to the object plane of the eyepiece 16, so as to facilitate the imaging of the corona. Behind the eyepiece 16, a magnified virtual image of the corona is formed;

The beam splitter 17 connected to the eyepiece 16, the beam splitter 17 has an included angle with the optical axis of the eyepiece 16, the light reflected by the beam splitter 17 enters the human eye, and the virtual image of the corona seen by the human eye in the same orientation as the corona.

The optical fiber image transmission bundle 15 is an optical fiber bundle formed by a plurality of optical fibers fixedly arranged together, and it can pass an image plane with a certain area through each optical fiber, and transmit the image point by point from one end of the optical fiber bundle to the other end, And there is no signal conversion process similar to optical communication in the middle. In this embodiment, the upright and inverted conditions of the virtual image formed by the eyepiece 16 can be changed by twisting the optical fiber image transmission bundle 15 .

The beam splitter 17 is also called a half-mirror, which can reflect the light processed by the eyepiece 16 into the human eye, so that the human eye can see the virtual image of the corona at the corona discharge, which is about to pass through the head-mounted display. The processed virtual image of the corona is superposed with the actual corona discharge background, so as to achieve the purpose of seeing the virtual image of the corona at the actual corona discharge, so as to ensure the accuracy of detection. Moreover, due to the use of the beam splitter 17, the human eye can see the corona virtual image and does not affect the normal vision. The maintenance personnel can wear the head-mounted display at any time for maintenance work, so that the corona phenomenon can be found in time and can be repaired. Timely maintenance can greatly avoid the loss of the power system.

Wherein, the solar-blind ultraviolet image intensifier includes:

The ultraviolet detector 13 that is connected with described ultraviolet objective lens, described ultraviolet objective lens 11 is imaged on the detection surface of described ultraviolet detector 13, that is to say, the detection surface of described ultraviolet detector 13 is exactly described sun-blind ultraviolet light. The detection surface of the image intensifier;

A low-light image intensifier 14 , the input surface of the low-light image intensifier 14 is connected to the output surface of the ultraviolet detector 13 .

Obtained on the detection surface of the ultraviolet detector 13 is the real image of the corona. At this moment, the intensity of the light signal of the corona through the ultraviolet detector 13 is still very weak, and it is difficult for human eyes to observe. Therefore, in the ultraviolet detector 13 The output surface of the corona is connected with a micro-light image intensifier 14 to amplify the intensity of the light signal of the corona for subsequent observation.

It should be noted that the size of the angle between the beam splitter 17 and the optical axis of the eyepiece 16 is not limited in this embodiment, as long as the light reflected by the beam splitter 17 can enter the human eye, the specific angle can be determined according to the helmet. The specific arrangement position of each component in the display system is adjusted. Preferably, the optical axis of the beam splitter 17 and the eyepiece 16 is at an angle of 30°-60°. More preferably, the beam splitter 17 and the eyepiece 16 optical axes are at an angle of 45°.

Because the light intensity of the corona discharge is very small, even if the light intensity of the corona enhanced by the low-light image intensifier 14 is not too high than the normal light intensity of sunlight radiation during the day, therefore, preferably, this The reflectivity of the beam splitter 17 in the embodiment should be greater than the transmittance. Of course, the reflectivity of the spectroscopic mirror 17 can be properly adjusted according to actual detection needs, so as to control the brightness ratio between the real object and the virtual image observed by human eyes.

And, in the present embodiment, in order to be convenient to the detection of corona, and can carry out maintenance in time after corona discharge is detected, preferably, the object distance of the ultraviolet objective lens 11 described in the present embodiment is 0.3m-infinity, so The image distance of the eyepiece 16 is 0.3m-infinity, more preferably, the object distance of the ultraviolet objective lens 11 is 0.5m-infinity, and the image distance of the eyepiece 16 is 0.5m-infinity.

To sum up, the head-mounted display provided by the embodiment of the present invention utilizes the "sunblindness" characteristic of ultraviolet light, adopts an ultraviolet objective lens to pick up the light signal of corona, and filters out all but the sunblind ultraviolet band through an ultraviolet filter. Then use the solar-blind ultraviolet image intensifier to spectrally convert and enhance the received corona light signal, and convert it into a visible light signal with strong light intensity, so that the human eye can observe the corona Afterwards, the optical fiber image transmission beam is used to convert the spectrum-converted and enhanced corona light signal through the eyepiece to form an enlarged virtual image, and then the light is reflected by the beam splitter into the human eye. At this time, the human eye will be at the corona discharge. Seeing a virtual image of a corona.

Since the detection of corona is mainly carried out in the sun-blind ultraviolet band, it is less affected by external light, so the virtual image of corona can be clearly seen by the human eye, which improves the detection accuracy of corona, and because the ultraviolet helmet display itself is easy to carry , you only need to wear it on your head, thus freeing your hands, and, due to the use of the beam splitter, the wearer can see the corona virtual image without affecting the normal vision, and the maintenance personnel can wear it at any time Wearing the helmet-mounted display to carry out maintenance work, so that the corona phenomenon can be discovered in time and timely maintenance can be carried out, which greatly avoids the loss of the power system.

Moreover, since the sun-blind ultraviolet band is used for corona detection in this embodiment, it can still work normally and accurately locate in sunlight and foggy weather conditions, and is completely suitable for daily use in high-voltage substation systems and transmission lines, etc. Fault detection.

What is described in detail in the embodiment of the present invention is only the optical path part of the head-mounted display. Those skilled in the art can understand that the above-mentioned optical elements are connected to each other through a certain mechanical structure, and, except for the optical path part, the helmet The display should also include circuit parts for powering various components, such as circuits and power supplies for ultraviolet objective lenses, eyepieces, image intensifiers, etc.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. a Helmet Mounted Display, is applied to corona detection, it is characterized in that, comprising:

Ultraviolet object lens, for absorbing the light signal of corona;

The day blind ultraviolet imaging enhancer being connected with described ultraviolet object lens, described ultraviolet object lens images on the test surface of described day blind ultraviolet imaging enhancer;

Ultraviolet filter between described ultraviolet object lens and described day blind ultraviolet imaging enhancer;

Optical fiber image transmission beam and eyepiece, the input face end of described optical fiber image transmission beam is connected with the output face of described day blind ultraviolet imaging enhancer, and its output face end is connected with described eyepiece, as the object plane of described eyepiece;

The spectroscope being connected with described eyepiece, the optical axis of described spectroscope and described eyepiece has angle, and the light after described spectroscope reflection enters human eye, and the virtual image of the corona that human eye is seen and described corona are positioned at same orientation, wherein, described eyepiece and human eye are positioned at spectroscopical the same side.

2. Helmet Mounted Display according to claim 1, is characterized in that, within described day, blind ultraviolet imaging enhancer comprises:

With the ultraviolet detector that described ultraviolet object lens is connected, described ultraviolet object lens images on the test surface of described ultraviolet detector;

Gleam image intensifier, the input face of described gleam image intensifier is connected with the output face of described ultraviolet detector.

3. Helmet Mounted Display according to claim 2, is characterized in that, the optical axis of described spectroscope and described eyepiece is 30 ° of-60 ° of angles.

4. Helmet Mounted Display according to claim 3, is characterized in that, the optical axis of described spectroscope and described eyepiece is 45 ° of angles.

5. Helmet Mounted Display according to claim 1, is characterized in that, the object distance of described ultraviolet object lens is 0.3m-infinite distance.

6. Helmet Mounted Display according to claim 5, is characterized in that, the image distance of described eyepiece is 0.3m-infinite distance.

7. Helmet Mounted Display according to claim 5, is characterized in that, the object distance of described ultraviolet object lens is 0.5m-infinite distance.

8. Helmet Mounted Display according to claim 7, is characterized in that, the image distance of described eyepiece is 0.5m-infinite distance.

9. according to the Helmet Mounted Display described in claim 1-8 any one, it is characterized in that, described spectroscopical reflectivity is greater than transmissivity.

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