KR101170140B1 - Optical System for corona discharge detection and apparatus for detecting ultraviolet rays - Google Patents

Abstract

Ultraviolet rays are detected using a corona-prevention detection optical system including a first optical system serving as a daytime optical system for collecting visible light and a second optical system serving as an ultraviolet detection optical system for collecting ultraviolet light. In particular, the first optical system and the second optical system are located on the same optical axis, and the first optical system is located in the front of the second optical system and is located in an area where no light is incident on the second optical system. Excellent corona discharge detection optics can be implemented.

Description

Optical system for corona discharge detection and apparatus for detecting ultraviolet rays

The present invention relates to an optical system, and more particularly, to a corona discharge detection optical system and an ultraviolet detection device using the same.

In general, a device for detecting corona discharge may be classified into an ultrasonic method, a method using a night vision device, and a method using an infrared ray and an ultraviolet sensor camera according to a detection method.

Corona discharge detection apparatus using the ultrasonic method is a device for collecting by using an antenna and an amplification device, etc. This device can not display the image of the corona discharge, it is not possible to accurately analyze the corona generation position of the object. In addition, there is a disadvantage that the corona detection may fail when the object is off, depending on the inspector's supervision.

The corona discharge detector using the night vision method uses an image amplification tube, which is low in sensitivity to detect energy emitted during corona discharge, and has a high sensitivity to sunlight or artificial light sources rather than corona discharge energy. There is a disadvantage that can not be.

Corona discharge detection apparatus using an infrared sensor camera has a problem that an error according to the emissivity to the infrared thermal image in the actual power system occurs.

On the other hand, the corona discharge detection device using the ultraviolet sensor camera is characterized by detecting the ultraviolet rays generated in the initial discharge phenomenon and showing the image, and has the advantage that can detect the exact discharge position compared to the device using the existing ultrasound, It is used a lot. In this device, the UV sensor-type camera is interlocked with the daytime optical module to image the surroundings of the high voltage equipment where the corona discharge is generated, and condenses the UV signal generated by the corona discharge generated by the ultraviolet optical system to the UV amplifier tube. It detects with high sensitivity, and superimposes the image around the high voltage equipment and the image corresponding to the detected ultraviolet signal into a single image.

Ultraviolet rays detected by the corona discharge detection device using the UV sensor camera are bands called solar blinds, which are 250 to 280 nm in the UV-C region, and are naturally blocked on the ground because they are completely blocked by the ozone layer in the atmosphere. I never do that. Therefore, it is important to collect the weak signal of the solar blind band (250 ~ 280nm) to be measured, and a filter for filtering the noise signal due to the sunlight and the UV optical system with high light collection efficiency.

Corona discharge detection apparatus using a UV sensor camera is divided into a beam splitter method and a reflector method according to the position of the daytime optical system and the ultraviolet optical system. The corona detection device of the beam splitter method separates the amount of light in the ultraviolet-visible ray band incident from the object side into the beam splitter and transmits the light to the daytime optical system and the ultraviolet optical system. Therefore, when designing the objective lens system of the ultraviolet optical system, the weakest ultraviolet signal can be detected by accepting the maximum amount of ultraviolet signals with the lowest aperture number (F number). However, when the aperture is widened in order to lower the aperture number in such a lens system, there is a problem in that the resolution performance of the outer portion is deteriorated.

On the contrary, the reflector type corona discharge detection device detects the light incident to the outside of the optical system from the ultraviolet-visible light incident on the object side by applying an ultraviolet catadioptric lens, and at the center of the reflective refraction optical system. In the area where light is not incident, two reflectors are applied to change the light path to deliver light to the daytime optics. Reflector type corona discharge detection device has the advantage that the ultraviolet light detection sensitivity is large because of the large aperture in which light is incident, there is a problem that the volume is arranged by placing the daytime optical module and the large reflection refractive optical system in a parallel structure.

The problem to be solved by the present invention is to provide an optical system capable of detecting the ultraviolet signal generated at the time of corona discharge and confirmation of the generation position and the ultraviolet detection device using the same.

Another object of the present invention is to provide a corona discharge detection optical system having excellent optical performance.

In addition, the problem to be solved by the present invention is to provide a corona discharge detection optical system and a UV detection device using the same that can utilize the space efficiently while the volume is small.

UV detection device according to a feature of the present invention for achieving the above object,

A first optical system and a second optical system, which are sequentially located on the same optical axis from the light incident side; A first detector which receives an optical signal other than a set band collected by the first optical system and outputs a corresponding first image signal; A filter included in the second optical system and filtering and outputting an ultraviolet signal of the set band from the optical signal collected by the second optical system; And a second detector configured to output a second image signal corresponding to the ultraviolet signal of the set band provided from the filter.

Corona discharge detection optical system according to another feature of the present invention,

A first optical system for condensing the visible light incident from the side from which light is incident; And a second optical system for collecting and outputting incident ultraviolet rays, wherein the first optical system and the second optical system are positioned on the same optical axis, and the first optical system is located in front of the second optical system and the second optical system. It is located in an area where no light is incident on the optical system.

It is possible to provide an ultraviolet detection device which is smaller and lighter in size than existing equipment, and has excellent ultraviolet detection sensitivity and thus detects even weak ultraviolet signals. In particular, by arranging and applying the daytime optical system to the area where the light is not incident in the center of the ultraviolet detection optical system, it is possible to provide a corona discharge detection optical system and an ultraviolet detection device using the same, which can effectively utilize the space and is small in volume and excellent in detection sensitivity. have.

In addition, the aberration of the ultraviolet detection optical system may be reduced to provide a clear image with a high MTF (modulation transfer function) value.

In addition, the UV detection optical system of the corona discharge detection optical system is excellent in blocking efficiency against light other than UV-C incident to the sunlight by transmitting only the UV-C ultraviolet light to the detection unit and blocking visible light from the two reflectors.

1 is a block diagram of an ultraviolet detection device according to an embodiment of the present invention.
2 is a detailed structural diagram of an ultraviolet detection device according to an embodiment of the present invention.
3 is a perspective view showing an embodiment of an ultraviolet detection device according to an embodiment of the present invention.
4 is a view showing the structure of a second optical system of the corona discharge detection optical system according to an embodiment of the present invention.
5 is a graph illustrating a modulation transfer function (MTF) characteristic of a second optical system of a corona discharge detection optical system according to an exemplary embodiment of the present invention.
6 is a diagram illustrating aberration characteristics of the second optical system of the corona discharge detection optical system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

Now, a corona discharge detection optical system and an ultraviolet detection device using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an ultraviolet detection device 1 according to an embodiment of the present invention, Figure 2 is a specific structural diagram of the ultraviolet detection device (1). 3 is a perspective view showing an embodiment of an ultraviolet detection device according to an embodiment of the present invention.

As shown in FIG. 1, the ultraviolet detection device 1 according to the embodiment of the present invention includes a corona discharge detection optical system 10, a first detection unit 20, an ultraviolet filter 30, and an ultraviolet image amplifier 40. , An optical fiber taper 50, a second detector 60, and an image superimposition processor 70.

The corona discharge detection optical system 10 includes first and second optical systems 11 and 12 which are sequentially positioned from the object side, that is, the side from which light is incident, as shown in FIGS. 2 and 3. It collects and outputs the ultraviolet rays from the incident light. The corona discharge detection optical system 10 will be described in more detail later.

The ultraviolet filter 30 blocks wavelength bands other than the solar blind band. That is, signals in the solar blind band (hereinafter referred to as ultraviolet signals) are transmitted, and signals in the band outside the band are blocked. The ultraviolet filter 30 having this function is positioned between the lenses constituting the second optical system 12.

The ultraviolet image amplifier 40 receives the ultraviolet signal transmitted through the ultraviolet filter 30 while condensed by the corona discharge detection optical system 10 and amplifies and outputs the ultraviolet signal. Light in the solar blind band (eg, 250-280 nm), ie, ultraviolet rays, is completely blocked by the ozone layer, so that almost no background radiation is present on the ground. However, an ultraviolet image amplifying element is required when detecting a weak intensity of ultraviolet rays that may be generated during corona discharge such as burner flame of gas turbine and spark of high voltage line. In general, since the ultraviolet image amplification device reacts from UV-A to UV-C, in order to operate stably outdoors, solar radiation must be effectively prevented. In the exemplary embodiment of the present invention, the ultraviolet filter 30 transmits only the light of the solar blind band and amplifies it effectively using the ultraviolet image amplifier 40.

Meanwhile, the ultraviolet image amplifier 30 may receive a solar blind band signal, that is, an ultraviolet signal, and amplify and output the ultraviolet signal. For example, it can output as visible light having a wavelength of 540 nm. Since the ultraviolet image amplifier 40 according to the embodiment of the present invention has a structure made of a known technique, detailed description of the structure is omitted here. In the amplification process of the general ultraviolet image amplification unit, when light enters the surface of the photocathode tube, electrons are emitted from the inside of the photocathode tube, and the electrons are amplified while passing through a microchannel plate (MCP) under high voltage by a power supply. Generates thousands to tens of thousands of emitted electrons. The generated electrons reach a fluorescent screen after several nanoseconds (for example, 10 ^-9 seconds), and are emitted in the form of photons and output.

The optical fiber taper 50 provides an optical signal amplified by the ultraviolet image amplifier 40 to the second detector 60. The optical fiber taper 50 functions as a kind of relay optical system in which the amplified light is incident on the sensor surface of the second detection unit 60. In general, a relay optical system includes a relay lens coupling method and a fiber optic taper coupling method. The relay lens coupling method has a problem in that a loss of light over an effective diameter of the lens is large. In the embodiment of the optical fiber taper coupling method was used. However, it is not necessarily limited to this.

The first and second detectors 20 and 60 receive an optical signal input as a kind of sensor and output an electrical signal corresponding thereto. In particular, the first detector 20 is positioned at the front center side of the second optical system 12 to receive an optical signal of visible light and output an electrical signal corresponding thereto, and the second detector 60 is an ultraviolet filter 30. ) And receives the amplified solar blind band signal through the ultraviolet image amplifier 40 and outputs an electrical signal corresponding thereto. That is, the first detector 20 detects visible light and outputs a first image signal, and the second detector 60 detects an optical signal of a solar blind band, that is, an ultraviolet signal, and outputs a second image signal. .

The first and second detectors 60 may include a pixel module including a plurality of pixels for outputting an electrical signal corresponding to an incident optical signal, and a corresponding brightness information by processing an electrical signal output from the pixel module. The branch may be implemented in a form including a processing module for outputting a signal. In this case, the pixel module may be implemented in the form of a pixel array, for example, an array of 256: 256, and each pixel is formed of a photodiode (PD). In addition, the processing module has a function of Single-Instruction Multiple Data (SIMD), which outputs data corresponding to one column, that is, 256 pixels, at one time with one command, and processes about 4000 frames per second, for example. High speed signal processing may be possible.

On the other hand, the first detection unit 20 may be made compact so that the size of the first optical system 11 can be reduced. The signal output through the first detector 20 may be transmitted to the image amplification processing unit 70, which may be located outside along a guide of a mounting unit (not shown).

The image superimposition processor 70 superimposes the first image signal provided from the first detector 20 and the second image signal output from the second detector 60.

Meanwhile, as shown in FIG. 2, the corona discharge detection optical system 10 includes a first optical system 11 and a second optical system 12 that are sequentially positioned from the side from which the ultraviolet light is incident. The first and second optical systems 11 and 12 are positioned on the same optical axis as shown in FIG. 2, and particularly, the first optical system 11 in a region Ar in which light in front of the second optical system 12 is not incident. ) Is located. The first optical system 11 collects the visible light incident between the protective window 80 and the first detection unit 20 and outputs the incident light to the first detection unit 20, and mainly detects the visible light during the day. Daytime optics ”. The first optical system 11, which is a daytime optical system, may be formed of a lens having an optical performance capable of obtaining a sufficiently high resolution image even in low light during the daytime.

The field of view of the first optical system 11 may be the same as the field of view of the second optical system 12, as a result of which the image obtained by the first optical system 11 and the second optical system 12 described later are obtained. When the ultraviolet image is superimposed, the image may be easily superimposed without adjusting the scale.

On the other hand, the protection window 80 is a window for protecting the components of the ultraviolet detection device 1, which can transmit both the visible light (0.4 ~ 0.7㎛) and the optical signal of the sun blind band (0.25 ~ 0.28㎛) It is made of material. Materials that transmit optical signals in the band 0.25 ~ 0.28㎛ are fused silica (refractive index n _d = 1.4585), quartz (Quartz (n _d = 1.4586)), calcium fluoride (CaF ₂ (n _d = 1.4338) )) And so on. Here, a protective window 80 made of fused silica is used, but is not necessarily limited thereto. When the optical signal transmittance of the sun blind band of the protective window 80 is high, the transmission efficiency of the ultraviolet signal transmitted to the second optical system 12 that performs ultraviolet detection may be excellent.

The second optical system 12 condenses the ultraviolet signal in the solar blind band and outputs it to the second detection unit 60, which is also referred to as "ultraviolet detection optical system", or "ultraviolet reflection refractive optical system".

4 is a view showing the structure of a second optical system of the corona discharge detection optical system according to an embodiment of the present invention.

As shown in FIG. 4, the second optical system according to the embodiment of the present invention, that is, the ultraviolet detection optical system 12 includes the first lens group I and the second lens group II.

The first lens group I has a meniscus type first lens L1 having a positive refractive power and convex toward the incident side of the ultraviolet ray, and a menisc having a negative refractive power and convex toward the sensor, that is, the second detection unit 60. The second lens L2 has a curse shape, and a reflecting mirror L3 having a concave shape toward the incident side of the ultraviolet light, and has a positive refractive power as a whole. Herein, an aperture (not shown) may be positioned to the side where the ultraviolet rays of the first lens L1 are incident, the first lens L1 and the second lens L2 are made of a fused silica material, and the reflector L3. Silver may be made of fused silica or aluminum.

The second lens group II has a negative refractive power and has a concave-shaped first filter lens FL1, a second filter FL2, a third filter FL3, and a positive refractive power. It includes a fourth filter lens (FL4) of the overall has a positive refractive power.

The second lens group II is the ultraviolet filter 30, and the ultraviolet image amplifier 30 is positioned above the fourth filter lens FL4.

The first filter lens FL1 and the fourth filter lens FL4 may be formed of a material having a filter function to block visible light. The second filter FL2 may function as a filter for blocking an optical signal of 300 to 360 nm in the UV-C band, and the third filter FL3 may function as a filter for blocking an optical signal of 370 to 420 nm.

The second lens group II may be implemented to include a first filter lens FL1, a second filter FL2, a third filter FL3, and a fourth filter lens FL4.

The operation of the corona discharge detection optical system 10 having the structure as described above will be described in more detail.

In an embodiment of the present invention, the first optical system 11, which is a daytime optical system, is positioned on the same optical axis as the second optical system 12 while being located in an area where light of the second optical system 12 described later is not incident. In order to satisfy the following conditions,

Here, R represents the size of the reflecting effective mirror in the second lens L2 of the ultraviolet detection optical system 12, and A represents the size of the daytime optical system 11.

Daytime optical system according to an embodiment of the present invention, that is, the first optical system 11 is located between the first lens group I of the protective window 80 and the second optical system 12 while satisfying the above Equation 1 The second optical system 12 is positioned in an area where no light is incident on the front surface of the second optical system 12. Therefore, as shown in FIG. 2, the first optical system 11 may collect the visible light incident on the same optical axis as the second optical system 12 and output the incident light to the first detection unit 20.

As such, while the first and second optical systems 11 and 12 are positioned on the same optical axis, the incident light is not blocked from being transmitted to the focal plane of the optical system in front of the second optical system 12 which is the ultraviolet detection optical system. The first optical system 11, which is a daytime optical system, is positioned to collect visible light, thereby forming the corona discharge detection optical system 10, which is an ultraviolet reflective refractive optical system, without applying a separate light splitter, reflector, or the like. It is possible to reduce the weight and volume of the consequently, it is easy to miniaturize the corona discharge detection optical system 10 and the ultraviolet detection device (1).

In addition, since the first optical system 11 and the second optical system 12 are positioned on the same optical axis while the first optical system 11, which is the daytime optical system, is positioned at the center of the ultraviolet detection device 1, the first optical system 11 is located. And parallax between the second optical system 12 can be eliminated.

In addition, the first lens group I and the second lens group II of the ultraviolet detection optical system 12 according to the embodiment of the present invention are implemented in a form satisfying the following conditions to provide optimal optical performance.

The effective focal length F1 of the first lens group I satisfies the following expression (2).

Here f denotes the total effective focal length of the ultraviolet detection optical system 12.

In addition, the effective mirror size and the aperture size reflected by the second lens L2 satisfy the following equation (3).

Here, E represents the size of the aperture (not shown) positioned in front of the first lens 1, and M represents the size of the effective mirror reflected from the second lens (L2) . The size of the effective mirror reflects the size of the diameter of the portion reflected by the reflector L3 and incident on the second lens L2 is reflected by the second lens L2 and incident on the second lens group II. Indicates.

In addition, the effective focal length f1 of the first lens L1 satisfies the following equation (4).

In addition, the effective focal length f2 of the second lens L2 satisfies the following equation (5).

In addition, the effective focal length f3 of the reflector L3 satisfies the following expression (6).

In addition, in order to implement the compact ultraviolet detection optical system 12, the distance D1 between the second lens L2 and the reflector L3 satisfies Equation 7 below.

On the other hand, in the second lens group II of the ultraviolet detection optical system 12, the effective focal length F2 satisfies the following expression (8).

In addition, the effective focal length f4 of the first filter lens FL1 of the second lens group II satisfies the following equation (9).

In addition, the effective focal length f5 of the fourth filter lens FL4 of the second lens group II satisfies the following expression (10).

In addition, the distance between the first lens group I and the second lens group II, that is, the distance D2 between the second lens L2 and the first filter lens FL3 satisfies Equation 11 below. .

Specific exemplary values in the case of implementing the ultraviolet detection optical system 12 according to the embodiment of the present invention having a form satisfying such conditions are shown in Table 1 below.

Such an embodiment according to the present invention is shown in Table 1 below.

Face number Radius of curvature
(r) Distance from front
Or thickness (D) (mm) Effective radius division One Plane (∞) 5.0 44.5 Glass 2 Plane (∞) 60.0 44.3 3 165.701 7.0 40.0 Glass 4 340.398 7.5 39.9 5 -165.746 7.0 39.9 Glass 6 -341.491 58.0 40.7 7 -224.592 -58.0 44.7 Mirror 8 -341.491 54.5 26.0 Mirror 9 -74.597 5.0 16.4 filter # 1 10 Plane (∞) 2.0 16.2 11 Plane (∞) 1.5 16.1 Glass 12 Plane (∞) 0.1 16.1 filter # 2 13 Plane (∞) 1.5 16.1 Glass 14 Plane (∞) 10.0 16.0 filter # 3 15 Plane (∞) 1.0 15.8 16 65.653 5.0 15.7 filter # 1 17 -154.163 8.5 15.4 18 Plane (∞) 5.0 13.1 Glass 19 Plane (∞) - 12.25

In Table 1, ri (i = 1 to 17) represents the radius of curvature of the refractive surface, Di (i = 1 to 17) represents the thickness of the lens or the distance between the lenses. The division represents the material of the face. Also, r18 and r19 are front and rear surfaces of the protective glass window 41 of the ultraviolet image amplifier 40. The main wavelength of the optical signal incident on the ultraviolet detection optical system 12 according to the embodiment of the present invention implemented according to the embodiment value is, for example, 260 nm and can correct aberrations up to 245 to 275 nm.

FIG. 5 is a graph illustrating a modulation transfer function (MTF) characteristic of the ultraviolet detection optical system 12 according to the exemplary embodiment of the present invention, which satisfies the exemplary values according to Table 1 above. In Figure 5, the vertical axis represents the normalized modulation transfer function value, and the horizontal axis represents the resolution (lp / mm). And T represents the meridian resolution, and S represents the spherical resolution.

In addition, the aberration characteristics of the ultraviolet detection optical system 12 according to the embodiment of the present invention satisfying the embodiment values according to Table 1 are as shown in FIG. 6.

6 is a graph showing the distortion aberration of the ultraviolet detection optical system 12 according to the embodiment of the present invention. Figure 6 shows that the distortion aberration characteristics within +0.5 ± 0.5%, especially when the viewing angle of the ultraviolet detection optical system is ± 4 °.

Next, the operation thereof will be described in more detail based on the ultraviolet detection device 1 having such a structure.

Light incident through the protective window 80 is collected through the first optical system 11 of the corona discharge detection optical system 10, and the collected light is output to the first detection unit 20. The first detector 20 outputs a first image signal, which is an electrical signal corresponding to input light, in particular, visible light, and the first image signal is provided to the image superimposition processor 70. At this time, since the first optical system 11 is small, the light incident to the center of the protective window 80 is collected by the first optical system 11, while the light incident to the outer side of the protective window 80 is the first light. The light is collected by the second optical system 12 that is not incident on the optical system 11 and positioned above the first optical system 11, and is output to the second detection unit 60.

Specifically, the light that is not collected by the first optical system 11 is reflected by the protective mirror L3 of the second optical system 12, so that the first and second lenses L1 and L2 of the first lens group I are reflected. ), And then input to the ultraviolet filter 30 which is the second lens group II by the first and second lenses L1 and L2. The ultraviolet filter 30 filters and outputs only an ultraviolet signal from the input light, and blocks light signals of the remaining bands.

The ultraviolet signal filtered through the ultraviolet filter 30, that is, the second lens group II is incident to the ultraviolet image amplifier 40. The ultraviolet image amplifier 40 amplifies and outputs incident light.

The ultraviolet signal amplified and output by the ultraviolet image amplifier 40 is incident on the second detector 60 by an optical fiber taper 50 connected to the output side of the sub-ultraviolet image amplifier 40. The second detector 60 outputs a second image signal, which is an electrical signal corresponding to the incident ultraviolet signal, and the second image signal is provided to the image superimposition processor 70.

The image superimposition processing unit 70 supplies the first image signal acquired by the first optical system 11 and the first detection unit 20, which are daytime optical systems, and the second optical system 12 and the second detection unit 60, which are ultraviolet detection optical systems. The second image signal acquired by the process is superimposed and a corresponding image is output. Therefore, by effectively collecting and outputting a weak ultraviolet signal generated during corona discharge as an image, in the daytime background, the corona discharge position can be effectively observed with the naked eye through the display.

The area where light is not transmitted to the ultraviolet image amplifying unit on the object side of the ultraviolet reflective refraction optical system forming the corona discharge detection optical system is used as an installation space for the daytime optical system for collecting visible light, and the daytime optical system and the first detection unit Since the obtained image signal can be transmitted to the outside through a very thin wire, it is possible to minimize the size of the overall optical system and the size of the ultraviolet detection device.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (15)

A first optical system and a second optical system, which are sequentially located on the same optical axis from the light incident side;
A first detector for receiving an optical signal in a visible light band collected by the first optical system and outputting a corresponding first image signal;
A filter included in the second optical system and filtering and outputting an ultraviolet signal having a predetermined band from an optical signal collected by the second optical system; And
A second detector configured to output a second image signal corresponding to the ultraviolet signal of the set band provided from the filter
UV detection device comprising a. The method of claim 1,
The first optical system collects visible light incident between the protective window of the ultraviolet detection device and the first detection unit, and collects visible light incident on the front surface of the second optical system and does not enter light into the ultraviolet image amplifier. Located, the ultraviolet detection device. The method of claim 1, wherein
The second optical system includes: a first lens group including at least one lens for collecting light not collected by the first optical system; and a reflector reflecting light collected by the first lens group; And
A second lens group including an ultraviolet filter which is focused by the first lens group and then outputs only an ultraviolet signal in a solar blind band
Ultraviolet detection apparatus comprising a. The method of claim 3,
And the second lens group includes at least one lens made of a material having a filter function to block ultraviolet signals of visible light, UV-A and UV-B. The method of claim 3,
The said 1st optical system and the 2nd optical system satisfy | fill the following conditions.
A / R <0.8
Where R represents the size of the effective reflecting mirror by the lens of the first optical system, A represents the size of the first optical system. The method according to any one of claims 1 to 5,
An ultraviolet image amplifier for receiving an amplified ultraviolet signal from the filter and outputting an amplified optical signal to the second detector; And
An optical fiber taper for injecting an optical signal output from the ultraviolet image amplifier into the second detection unit
Further comprising a ultraviolet detection device. The method according to any one of claims 1 to 5,
And an image superimposition processing unit which outputs a corresponding image by superimposing a first image signal provided from the first detection unit and a second image signal provided from the second detection unit. In order from the side where light enters,
A first optical system for collecting incident visible light; And
A second optical system that filters, condenses, and outputs only ultraviolet rays among incident light;
Including;
The first optical system and the second optical system are located on the same optical axis, the first optical system is located in front of the second optical system and located in an area where no light is incident on the second optical system, corona discharge detection Optical system. The method of claim 8, wherein
The second optical system
A first lens group including at least one lens for condensing non-condensed light, and a reflector reflecting light condensed by the first lens group; And
A second lens group including an ultraviolet filter which is focused by the first lens group and then outputs only an ultraviolet signal in a solar blind band
Containing, corona discharge detection optical system. The method of claim 9
The first lens group is
A first lens of a meniscus shape having positive refractive power and convex toward a first side to which ultraviolet rays are incident;
A second lens of meniscus shape having negative refractive power and convex toward a second side opposite to the side on which the ultraviolet ray is incident; And
Reflector concave to the first side and reflecting the incident ultraviolet rays to the first and second lenses
Corona discharge detection optical system comprising a. The method of claim 9
The second lens group
A first filter lens, a second filter, a third filter, and a fourth filter lens, which are sequentially positioned between the first lens group and the ultraviolet image amplifier and filter the incident ultraviolet rays and output the filtered ultraviolet rays;
And the first filter lens has a negative refractive power and is formed in a concave concave shape concave to the second side, and the fourth filter lens has a positive refractive power and has a biconvex shape. The method according to claim 10 or 11
Corona discharge detection optical system that satisfies the following conditions.
A / R <0.8
Where R represents the size of the reflecting effective mirror in the second lens, and A represents the size of the first optical system. The method according to claim 10 or 11
Corona discharge detection optical system that satisfies the following conditions.
0.9≤ F1 / f ≤1.0
0.6≤E / M≤0.7
Where f is the total effective focal length of the second optical system, E is the size of the aperture when the aperture is located in front of the first lens, and M is the size of the effective mirror reflected from the second lens. The method according to claim 10 or 11
A corona discharge detection optical system that satisfies at least one of the following conditions.
3.4≤ f1 / f ≤4.0
-4.0≤ f2 / f ≤-3.4
0.4≤ f3 / f ≤1.0
0.3≤ D1 / f ≤0.4
0.8≤ F2 / f ≤0.9
-1.0≤ f4 / f ≤-0.4
0.2≤ f5 / f ≤0.7
0.2≤ D2 / f ≤0.4
Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the reflector, D1 is the distance between the second lens and the reflector, and F2 is the effective focal length of the second lens group. , f4 denotes an effective focal length of the first filter lens, f5 denotes an effective focal length of the fourth filter lens, and D2 denotes a distance between the first filter lens and the fourth filter lens. The method of claim 11,
The second lens group is made of a material that blocks visible light and ultraviolet signals in the UV-A and UV-B bands, corona discharge detection optical system.

Images