JPH05273037A - Vibration detector for steel tower mounting equipment - Google Patents

Abstract

PURPOSE:To achieve a smaller size and a less weight by improving measuring accuracy and working efficiency of vibration of a steel tower mounting equipment. CONSTITUTION:An irradiation system K1 for irradiation of a laser light R3 for detecting vibration is provided between a laser light generator 11 and an objective lens 18 while an acoustooptical element 13 is interposed on an optical axis of the irradiation system K1. With a drive circuit at rest. a laser light R1 is admitted with the acoustooptical element 13 into a laser light irradiation system K2 for checking reflection as laser light R4 for checking reflection. The drive circuit 14 is operated to admit the laser light R1 with the acoustooptical element 13 into the irradiation system K1 as the laser light R3 for detecting vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel tower mounting device capable of reliably, swiftly and safely detecting a defective part such as a crack in a steel tower mounting device such as a suspension insulator for supporting a steel tower. The present invention relates to a vibration detection device.

[0002]

2. Description of the Related Art The applicant of the present application has proposed a vibration detecting device for an insulator device supporting an overhead power transmission line, as disclosed in Japanese Patent Laid-Open No. 35351/1990. This measuring device irradiates the surface of the suspension insulator constituting the insulator device with a laser beam to mechanically vibrate the suspension insulator, and a laser beam generator for oscillator vibration, and a laser beam for detecting vibration on the surface of the suspension insulator. A laser beam generator for vibration detection for irradiating the laser beam, a light receiver for receiving the reflected laser beam (object reflected light) emitted from the laser beam generator and reflected from the suspension insulator, and the reflected laser beam as a reference laser beam. It comprises a demodulator and a frequency analysis device for interfering and detecting the vibration of the suspension insulator from the interference light, and a voice conversion device for converting the detection signal output from the frequency analysis device into audible voice. Then, the quality of the suspended insulator is determined by the state of the audible sound.

[0003]

The back surface of the suspension insulator is usually formed concentrically with the folds on the back surface of the cap portion, because the creeping insulation distance is usually long. Since the laser light emitted from the suspension insulator is spot-like, the probability that the reflected laser light from the suspension insulator returns is low, and it is extremely difficult to know the position where the reflected light returns even when monitoring with an ITV camera, and it vibrates in a practical time. There was a problem that it could not be detected.

An object of the present invention is to make it possible to quickly and surely adjust the irradiation position of the laser beam for vibration detection on the equipment mounted on the tower, and to reduce the size and weight of the equipment. To provide.

[0005]

In order to achieve the above object, the invention according to claim 1 irradiates a vibration detecting laser light from a laser light generator to a steel tower mounting device through an objective lens, and In the vibration detection device for measuring the vibration of the steel tower mounting device, the reflected laser light and the reference laser light branched from the vibration detection laser light by the spectroscopic means are combined and interfered by the photosynthesis interference means, A reflection confirmation laser light irradiation system is provided between the laser light generator and the objective lens for irradiating the equipment mounted on the tower with the laser light output from the laser light generator as reflection confirmation laser light having a large beam diameter. I am taking means.

The invention according to claim 2 is, in claim 1, provided with laser light irradiation system switching means for switching between the vibration detection laser light irradiation system and the reflection confirmation laser light irradiation system.

[0007]

According to the first aspect of the invention, since the reflection confirmation laser light irradiation system is provided for irradiating the equipment attached to the tower with the laser light output from the laser light generator as the reflection confirmation laser light having a large beam diameter. When the reflection confirmation laser light having a large beam diameter reflected from the steel tower mounting device is captured by, for example, an ITV camera, the reflection confirmation laser light has a strong reflection point of the steel tower mounting device, and a strong reflection point of the laser light is confirmed.
Further, since the laser beam for vibration detection has a small beam diameter and a high light intensity, the irradiation position is bright even at a strong reflection point. Therefore,
By adjusting the reflection positions of the two laser beams at these two points to coincide with each other, the irradiation position of the laser beam for vibration detection can be adjusted quickly and reliably.

According to a second aspect of the present invention, the laser light output from the laser light generator passes through the reflection confirmation laser light irradiation system while the reflection confirmation laser light irradiation system is operated by the irradiation system switching means. The surface of the attached device is irradiated. After the reflection state of the reflection confirmation laser light is confirmed,
The laser light output from the same laser light generator passes through the detection laser light irradiation system while the vibration detection laser light irradiation system is operated by the irradiation system switching means.
The surface of the attached device is irradiated.

In the invention according to the second aspect, the laser beam output from the same laser beam generator is switched by the irradiation system switching means and used as the laser beam for vibration detection or the laser beam for confirmation of reflection. The laser light for reflection or the laser light for reflection detection can be irradiated at an intensity of the laser light generator.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will be described below with reference to FIGS. As shown in FIG. 3, a suspension armature 4 supporting a power transmission line 3 is provided on a support arm 2 of a steel tower 1.
Is hung. The suspension insulator string 4 is configured by connecting a large number of suspension insulators 5 shown in FIG. 4 in series. This suspension insulator 5 is composed of an insulator body 6, a cap metal fitting 7 which is cement-fitted to the upper portion thereof, and a pin metal fitting 8 which is cement-fitted to the lower portion thereof.

On the other hand, as shown in FIG. 3, a speaker 9 for mechanically vibrating the suspension insulator 5 is installed at a stable position on the ground, and a sound pressure is applied to the suspension insulator 5 through a space. The insulator 5 is made to vibrate.

A laser Doppler vibration detector 10 for detecting the vibration of the suspension insulator 5 by utilizing the interference of laser light is installed at a stable position on the ground. The laser Doppler vibration detecting device 10 will be described with reference to FIG. 1 mainly. A linearly polarized He-Ne laser light generator 1 is provided at a rear side (right side in FIG. 1) of a housing case 10a of the device.
1 is arranged. The laser light generator 11 outputs a laser light R of (wavelength λ = 0.64 μm, output to several mW). In front of the laser light generator 11, there is arranged a first polarization beam splitter 12 as a spectroscopic means for splitting the laser light R into two laser lights R1 and R2. First polarization beam splitter 1
In front of 2, laser light R traveling straight through the splitter 12
A first acousto-optic device 13 constituting an irradiation system switching means M1 capable of switching 1 to the primary diffraction laser beam R3 or the O-order laser beam R4 is provided so as to be driven by a drive circuit 14.
Hereinafter, in this embodiment, the primary diffraction laser light will be referred to as vibration detection laser light R3, and the O-order laser light will be referred to as reflection confirmation laser light R4. This first acousto-optic device 13
The configuration will be described later.

Further, in front of the first acousto-optic element 13, a first intermediate lens 15 having a focal length of, for example, about 50 mm is arranged for expanding the beam diameter of the vibration detecting laser beam R3, and the objective lens 18 is provided. With a collimator type lens arrangement, the beam diameter of the laser beam R3 for vibration detection is expanded to a parallel beam of, for example, about 10 mmφ so as to irradiate the object, that is, the suspension insulator 5. In front of this lens 15, a second polarization beam splitter 16 is arranged for making the vibration detecting laser beam R3 go straight and reflecting the reflected laser beam R3 'from the suspension insulator 5 in the right angle direction. Further, the second polarization beam splitter 16
A λ / 4 plate 17 is arranged in front of the.

The objective lens 18 has a diameter of 100.
mm, and a focal length of about 800 mm is used. In the first embodiment, the first polarization beam splitter 12,
First acousto-optic element 13, first intermediate lens 15, second polarization beam splitter 16, λ / 4 plate 17, and objective lens 1
The irradiation system K1 of the laser beam R3 for vibration detection is constituted by 8 and the like. Then, the vibration detecting laser beam R3 transmitted through the first acousto-optic element 13 is transmitted through the first intermediate lens 15 and the second intermediate lens 15.
After passing through the polarizing beam splitter 16 and the λ / 4 plate 17 and passing through the objective lens 18, the insulator main body 6 of the suspension insulator 5 is irradiated with the polarized beam splitter 16 and the λ / 4 plate 17, and then enters the objective lens 18 again as the object-reflected laser beam R3 ′. The polarization beam splitter 16 passes through the same optical axis as the irradiation optical axis, is reflected by the second polarization beam splitter 16 in the direction perpendicular to the lens 28, and will be described later.
Is incident on.

In a state where the first acousto-optic element 13 is not driven, the laser beam R1 passes through the first acousto-optic element 13 and becomes a reflection laser beam R4. A reflection confirmation laser beam for irradiating the reflection confirmation laser beam R4 on substantially the same optical axis as the vibration detection laser beam R3 is provided between the first polarization beam splitter 12 and the second polarization beam splitter 16. An irradiation system K2 is provided. This irradiation system K2
Is a first mirror 19, a second mirror 20, a third mirror 21 for reflecting and reflecting the reflection confirmation laser light R4, and a laser light R
The second intermediate lens 22 that expands the beam diameter of No. 4 and the fourth mirror 23 that reflects the laser light R4 that has passed through the lens 22 on the substantially same optical axis as the vibration detection laser light R3. ing. The fourth mirror 23 includes the objective lens 18, the first intermediate lens 15, and the second intermediate lens 2.
The laser light R for vibration detection is arranged at a position slightly displaced from the optical axis of the laser light R3 for vibration detection near the common focal point 2
3 is not blocked or the light intensity is not attenuated.

The reflection confirmation laser beam R4 reflected from the fourth mirror 23 is emitted from the second beam splitter 16 by λ.
The suspension insulator 5 is irradiated with light through the / 4 plate 17 and the objective lens 18. In this embodiment, the focal length of the second intermediate lens 22 is 20 mm.

On the optical axis of the reference laser light R2 split by the first beam splitter 12, the laser light R
A second acousto-optic element (AOM) 24 for shifting a constant frequency (80 MHz) to 2 is arranged, and a drive circuit 25 is connected to the acousto-optic element 24. Then, the reference laser beam R2 is input / reflected by the fifth mirror 26 via the acousto-optic element 24, and then, the photosynthetic interference unit M.
The object reflected laser light R3 ′ from the suspension insulator 5 and the reference laser light R2 are incident on the beam splitter 27 as reference numeral 2, and interfere with each other.

Between the second beam splitter 16 and the beam splitter 27, there is arranged a third intermediate lens 28 supported by an electric slide support mechanism 28a so that its position in the optical axis direction can be adjusted. Beam splitter 1
Object-reflected laser light R3 ′ reflected in a right angle direction by 6
Is guided to the third intermediate lens 28, and the lens 28 adjusts the beam diameter of the reflected laser light R3 ′ to be substantially the same as the beam diameter of the reference laser light R2.

Further, the interference laser light output from the beam splitter 27 is converted into an electric signal by an avalanche photodiode (APD) 29. Further, a demodulator 30 for converting into an output signal proportional to the frequency (speed) of the suspension insulator 5 is connected to the avalanche photodiode 29, and the demodulator 30 is provided with a frequency and a level of the suspension insulator 5. Frequency analysis device for analysis (FF
T analyzer) 31 is connected.

Next, the structure of the first acousto-optic device 13 will be described with reference to FIG. This element 13 is an acousto-optic medium 32.
A transducer 33 is bonded to the transducer 33, and the drive circuit 14 is connected to the transducer 33. When a predetermined high frequency signal is not applied by the drive circuit 14, the incident laser beam R1 goes straight to the reflection confirmation (Oth order).
It becomes the laser beam R4. On the contrary, when a predetermined high-frequency signal is applied to the first acousto-optic device 13, the incident laser beam R1 is diffracted by the angle 2θ and is radiated to the intermediate lens 15 as vibration detection (first-order diffraction) laser beam R3. I am trying to do it.

Next, the operation of the vibration detecting device constructed as described above will be described. First, when the laser light R is output from the laser light generator 11 with the drive circuit 14 of the first acousto-optic device 13 stopped, this laser light R
Is a straight-forward laser beam R generated by the first polarization beam splitter 12.
1 and the reflected reference laser beam R2. Since the first acousto-optic device 13 is stopped, the straight traveling laser light R1 becomes the reflection confirmation laser light R4 and is guided to the second polarization beam splitter 16 through the reflection confirmation laser light irradiation system K2 as described above. After passing through the λ / 4 plate 17, the light is incident on and reflected from the objective lens 18 by the mirror 39 arranged on the ground as shown in FIG. The reflection confirmation laser light R4 ′ reflected from the suspension insulator 5 passes through the mirror 39 and the storage case 10a of the vibration measuring device 10.
The reflection image is captured by the ITV camera 36 installed most recently and is displayed on the monitor television 37.

Therefore, when the irradiation state of the laser beam R4 for confirmation of reflection on the insulator body 6 as shown in FIG. 5 is confirmed and the strongest reflection point E among them is confirmed, , The direction of the mirror 39 is adjusted by operating the mirror drive device 38 which changes the irradiation direction of the laser Doppler vibration detection device 10 while turning on / off the signal of the drive circuit 14.
By operating the irradiation position of the vibration detecting laser light R3 so as to coincide with the strong reflection point E, the vibration detecting laser light R3
It becomes possible to irradiate 3 to the proper irradiation position on the surface of the insulator body 6. Even if the strong reflection point E is unclear or does not appear in the insulator body 6, the strong reflection point E is adjusted by operating the mirror driving device 38 to adjust the arrangement position of the mirror 39. To appear on the surface of.

Next, when the driving circuit 14 is continuously turned on and the high-frequency signal is applied to the first acousto-optic device 13, the He-Ne laser generator 11 outputs the laser beam R, and the first polarized beam beam is emitted. While the laser beam R2 traveling straight through the platter 12 passes through the first acousto-optic device 13, as shown in FIG.
As shown in FIG. 3, the light is diffracted by 2θ, passes through the optical axis for vibration detection, and is irradiated onto the suspension insulator 5 from the objective lens 18 through the mirror 39. At this time, the strong reflection point E of the insulator main body 6 is irradiated with the vibration detection laser light R3 so that it coincides with the strong reflection point E.
The reflected laser light R3 ′ is reliably returned to the vibration detection device 10, and the vibration measurement work is performed quickly and highly accurately because there is little attenuation of the light intensity. In this state, when the suspension insulator 5 is vibrated by the speaker 9, the frequency of the insulator body 6 is measured, and the demodulator 30 and the frequency analysis device 31 analyze whether or not the insulator is defective.

In the first embodiment, the first acousto-optic device 13
Since the frequency of the vibration detecting laser beam R3 is shifted by 81 MHz and the frequency of the reference laser beam R2 is shifted by 80 MHz by the second acousto-optic element 24, the beat of the interference laser beam which is synthetically interfered by the beam splitter 27 is generated. The component becomes 1MHz, and the conventional 8
Since the frequency is lower than 0 MHz, it becomes easy to extract an optical signal into an electrical signal.

Now, in the first embodiment of the present invention,
Since the laser beam R1 output from the He-Ne laser generator 11 can be switched to the vibration detection laser beam R3 or the reflection confirmation laser beam R4 by the first acoustooptic device 13 in the storage case 10a, Only by using the laser generator 11, a laser beam output function for vibration detection and reflection confirmation can be obtained, and the device can be reduced in size and weight.

Further, in this embodiment, the fourth mirror 2 for placing the confirmation laser light R4 on the optical axis of the vibration detection laser light R3.
Since the arrangement position of 3 is slightly displaced from the optical axis of the vibration detection laser beam R3, it is possible to prevent the intensity of the vibration detection laser beam R3 from decreasing and to prevent the reflection confirmation laser beam R4 from being reduced. Since the 4th mirror 23 can irradiate on the almost same optical axis as the vibration detection laser beam R3 with almost no attenuation, the intensity of the laser beam R4 does not decrease. Therefore, the suspension insulator 5 can be surely irradiated with the vibration detection laser light R3 or the reflection confirmation laser light R4 at an appropriate intensity without increasing the output of the laser generator 11, and the strong reflection point E can be confirmed. It is possible to easily perform the irradiation of the strong reflection point with the vibration detection laser beam R3, and to perform the irradiation reliably and promptly, thereby improving the efficiency of the detection work.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the He-Ne laser light generator 11 is of a random polarization type, and instead of the first acousto-optic device 13 of the first embodiment, the laser light generator 11 is replaced.
The third polarization beam splitter 40 that constitutes the reflection confirmation laser light irradiation system K2 is disposed between the first polarization beam splitter 12 and the first polarization beam splitter 12. Further, the reflection confirmation laser light R4 polarized in the right angle direction by the beam splitter 40 is
It is guided to the second polarization beam splitter 16 via the mirror 21, the second intermediate lens 22, and the fourth mirror 23, and is irradiated from the objective lens 18 to the suspension insulator 5. On the other hand, the laser beam R1 that travels straight through the third polarization beam splitter 40 is incident on the first polarization beam splitter 12 that is attached at an inclination (not shown), and the laser beam R3 for vibration detection.
Then, the reference laser beam R2 is branched.

Therefore, in the second embodiment as well as in the first embodiment, only one laser light generator 11 is used, and the vibration detecting laser light R3 and the reflection confirmation laser light R are used.
It is possible to irradiate the suspension insulator 5 with proper intensity with certainty. Further, the strong reflection point E can be easily confirmed, and the strong reflection point can be irradiated with the vibration detection laser beam R3 reliably and more quickly, and the efficiency of the detection work can be improved.

Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the He-Ne laser light generator 1
1 is a linear polarization type, and instead of the third polarization beam splitter 40 of the second embodiment described above, a seventh mirror 41 constituting a reflection confirmation laser light irradiation system K2 is used as a vibration detection laser light irradiation system K1. A slide support mechanism 42, which serves as a switching means M1 for the irradiation system K2, is switchably supported between an operating position and a retracted position. When irradiating the insulator with the reflection confirmation laser light R4, all the laser light R output from the laser light generator 11 is reflected in the orthogonal direction, and the reflected laser light R4 is reflected by the third mirror 21 and the second mirror 21. Intermediate lens 2
The laser beam is irradiated to the second polarization beam splitter 16 via the reflection confirmation laser light irradiation system K2 including the second and fourth mirrors 23.

Therefore, in the third embodiment, the attenuation of the intensity of the laser beam R4 can be surely prevented as compared with the above-mentioned embodiments, but the other constitution and effect are the same as those of the above-mentioned embodiments. It is the same.

The present invention is not limited to the above-mentioned respective embodiments, and it is possible to detect the vibration of an object other than the insulator, and to use the reflection confirmation laser beam R3 'reflected from the suspension insulator 5. A light receiving unit (not shown) in the storage case 10a receives light and confirms its reflection state. For example, the configuration of each part is arbitrarily changed and embodied without departing from the spirit of the present invention. You can also

[0032]

As described in detail above, according to the present invention, the laser beam for confirmation of reflection reflected from the equipment mounted on the steel tower is monitored by an ITV camera or the like to irradiate the proper position of the equipment for mounting vibration detection laser light. Therefore, it is possible to improve the accuracy of vibration measurement and work efficiency, and further to improve the laser light output from one laser light generator,
It can be used as laser light for vibration detection or laser light for confirmation of reflection, and therefore the device can be made smaller and lighter.

Further, when the switching means of the laser light irradiation system is provided, the power of the laser light can be almost irradiated for detecting the vibration, and the detection accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a first vibration detection device for a tower-mounted device according to the present invention.
It is a front view showing an example.

FIG. 2 is a sectional view of a first acoustooptic device.

FIG. 3 is a front view showing the entire vibration detection device.

FIG. 4 is a partial front view of a suspension insulator string.

FIG. 5 is a rear view of the insulator body showing the irradiation state of the vibration detection laser light and the reflection confirmation laser light.

FIG. 6 is a front view showing a second embodiment of the present invention.

FIG. 7 is a front view showing a third embodiment of the present invention.

[Explanation of symbols]

5 Suspension insulator as a tower attachment device, 10a Storage case, 10 Laser Doppler vibration detector, 11 He
-Ne laser generator, 12 first polarization beam splitter as spectroscopic means, 13 first acousto-optical element constituting irradiation system switching means M1, 14 drive circuit constituting irradiation system switching means M1, 15 first intermediate lens, 18 objective lens, 22 2nd intermediate lens, 19, 20, 21, 23,
26 first to fifth mirrors, 27 beam splitter as photosynthetic interference means M2, 32 acousto-optic medium, 40 third polarization beam splitter constituting laser light irradiation system K2 for reflection confirmation, 41 laser light irradiation system K2 for reflection confirmation Switch means M for the 7th mirror and 42 irradiation system K1, K2
Slide support mechanism as 1, R2 reference laser light, R
3 Vibration Detection Laser Light, R3 'Reflected Vibration Detection Laser Light, R4 Reflection Confirmation Laser Light, R4' Reflected Reflection Confirmation Laser Light, K1 Vibration Detection Laser Light Irradiation System, K2 Reflection Confirmation Laser Light irradiation system, M1 irradiation system switching means, M2 photosynthesis interference means.

Claims (2)

[Claims] 1. A laser beam generator irradiates vibration detecting laser light through an objective lens onto a steel tower mounting device, and the reflected laser light from the steel tower mounting device and the vibration detecting laser light are branched by a spectroscopic means. In a vibration detecting device for measuring vibration of a tower-mounted device by synthesizing and interfering with a reference laser beam by a photosynthesis interfering means, an output from the laser beam generator is provided between the laser beam generator and an objective lens. Vibration detection of equipment installed in a tower, characterized in that a laser light irradiation system for installation confirmation is provided to irradiate the equipment installed in the tower as a laser light for confirmation of reflection, which is larger than the beam diameter of the laser light for vibration detection apparatus. 2. The vibration detection of a tower-mounted device according to claim 1, further comprising laser light irradiation system switching means for switching between the vibration detection laser light irradiation system and the reflection confirmation laser light irradiation system. apparatus.