CN113552716B - Front scanning mirror system for measuring high-rise atmospheric wind field of foundation - Google Patents
Front scanning mirror system for measuring high-rise atmospheric wind field of foundation Download PDFInfo
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- CN113552716B CN113552716B CN202110703571.1A CN202110703571A CN113552716B CN 113552716 B CN113552716 B CN 113552716B CN 202110703571 A CN202110703571 A CN 202110703571A CN 113552716 B CN113552716 B CN 113552716B
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- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
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Abstract
The invention provides a preposed scanning mirror system for measuring a foundation high-rise atmospheric wind field, which mainly aims at the defects that the preposed scanning mirror for measuring the foundation high-rise atmospheric wind field has a complex structure, a large scanning movement range and a large weight, is difficult to carry out waterproof sealing to adapt to outdoor measurement and the like. The preposed scanning mirror system comprises a reflecting mirror, a one-dimensional linear displacement platform, a rotary protective cover and a rotary protective cover; the rotary platform drives the reflector to rotate along the axial direction of the main optical path through the one-dimensional linear displacement platform, and the rotary protective cover is used for protecting the rotary platform and the environment of the main optical path from being polluted by external environment; the rotary protection cover comprises a protection cover body, a zenith protection window and a side protection window, the protection cover body is arranged on the rotary platform, the side protection window is arranged on a reflection light path of the reflector, an optical signal collected by the side protection window is reflected to a main optical path through the reflector, and the main optical path transmits the collected optical signal to the ground high-rise atmospheric wind field measurement system.
Description
Technical Field
The invention belongs to the field of wind field measuring equipment, and particularly relates to a front scanning mirror system for measuring a high-rise atmospheric wind field of a foundation.
Background
The principle of the ground interferometer for measuring the middle and upper atmosphere wind field is as follows: and (3) inverting the movement speed information of the atmosphere by utilizing Doppler frequency shift through observing middle and upper atmosphere component emission spectral lines. The atmospheric components of the earth are excited to a higher energy level after directly or indirectly absorbing solar electromagnetic radiation energy, and release photons with a certain frequency when the atmospheric components jump from the higher energy level to a lower energy level, so that weak light radiation is formed, and different energy level jumps correspond to spectral lines with different wavelengths. When these atmospheric components move with the atmosphere, the airglow spectrum will shift in frequency relative to the ground-based anemometry interferometer. According to the Doppler effect, when the object is transmitted toward the observation directionDuring movement, the observed center frequency of the spectral line moves towards the direction of short wave; when moving away from the observation direction, the center frequency of the observed spectral line will shift towards the long wave direction. The amount of Doppler shift depends on the eigenfrequency σ of the spectral line 0 And the motion velocity v of the emission source, as shown in formula (1), where Δ σ is the Doppler frequency shift amount, σ 0 The eigenfrequency of the airglow line at velocity v =0m/s, and c is the speed of light.
Δσ＝σ 0 ·v/c (1)
The Doppler differential interference spectrometer for atmospheric wind field detection is mainly used for inverting atmospheric wind speed information by detecting phase change of interference fringes, and theoretical expressions of interference curves are disclosed in Doppler empirical spatial and iterative reconstruction, applied OPTICS Vol.46, no.29, PPPP7297, 2007:
wherein I (x) is the intensity of the interferogram, B (σ) is the spectral intensity, σ 0 Is the eigenwave number, σ, at a wind speed of 0 L Is Littrow wave number, theta L Is a Littrow angle, x is the corresponding position of the detector, and delta d is the asymmetry of the interferometer; when an incident line introduces a Doppler shift due to wind velocity v, the center wavenumber of the line becomes:
the above equation (2) becomes:
as can be seen from equations (2) and (3), the following relationship exists at the x =0 position of the interferogram sampling center:
as above, an atmospheric wind speed measurement method based on a doppler differential interference spectroscopy technique has been proposed. The ground-based wind measurement interferometer mainly uses OI630nm and OI557.7nm as detection sources to realize 250km and 90km height wind field detection. Warp direction and weft direction wind vector data are obtained by measuring five azimuth observations of zenith, southeast, northwest and slant. The azimuth observation is mainly realized by a front scanning mirror. The direction of the wind speed required to be collected for measuring the middle and upper atmospheric wind field of the foundation is shown in figure 1, the middle is the zenith direction, and the four sides are four oblique directions of east, south, west and north respectively.
As shown in FIG. 2, the conventional preposed scanning mirror for measuring the foundation high-rise atmospheric wind field is formed by two rectangular reflecting mirrors which are distributed at an angle of 45 degrees. The second plane mirror 102 can rotate 180 degrees around the horizontal optical axis under the driving of the second synchronous pulley system 104 at the position shown in the figure, so that the light inlet 105 points to the ceiling; the light inlet 105 can be inclined 45 degrees by rotating 135 degrees at the position shown in the figure, and then the first synchronous pulley system 103 drives the first plane reflector 101 and the second plane reflector 102 to synchronously rotate, so that the optical signal collection of 45 degrees in four directions of south, east, west and north is realized. This scanning mirror system leads to it to have bulky, the structure is complicated, scanning motion range is big, weight big scheduling problem owing to need two plane mirrors and respective bearing structure, and because synchronous pulley exposes, the structure is many, cause and be difficult to carry out waterproof sealing protection and adapt to defects such as outdoor measurement, present solution sets up one and can hold entire system and do not influence two slewing mechanism great ball covers of operation, but this mode causes bearing structure huge thereby is difficult to satisfy the operation requirement of wind field measurement interferometer system.
Disclosure of Invention
The invention aims to provide a preposed scanning mirror system for measuring a foundation high-rise atmospheric wind field, which is a multidirectional waterproof scanning mirror system of the foundation high-rise atmospheric wind field based on a rotary platform and a one-dimensional linear displacement platform and has the characteristics of simple and reliable structure, small volume and weight and easiness in realizing waterproof sealing, and the preposed scanning mirror system is large in scanning motion range and heavy in weight and is difficult to carry out waterproof sealing to adapt to outdoor measurement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preposed scanning mirror system for measuring a foundation high-rise atmospheric wind field comprises a reflecting mirror, a one-dimensional linear displacement platform, a rotary protective cover and a rotary protective cover; the reflector and the one-dimensional linear displacement platform are arranged in the rotary protective cover, the reflector is connected with the output end of the one-dimensional linear displacement platform, and the one-dimensional linear displacement platform drives the reflector to cut in and out a main optical path; the one-dimensional linear displacement platform is arranged on the rotary platform, and the rotary platform drives the reflector to rotate along the axial direction of the main light path through the one-dimensional linear displacement platform; the rotary platform is arranged on the mounting platform and used for being connected with a foundation high-rise atmospheric wind field measuring system, and the rotary protective cover is arranged on the outer side of the rotary platform and used for protecting the rotary platform and the main light path environment from being polluted by external environment; the rotary protection cover comprises a protection cover body, a zenith protection window and a side protection window, wherein the zenith protection window and the side protection window are arranged on the protection cover body; the zenith protection window is coaxially arranged with the axis of the rotary platform and the optical axis of the main optical path and is used for collecting optical signals in the zenith direction; the side protection window is arranged on a reflection light path of the reflector and synchronously rotates along with the reflector, an optical signal collected by the side protection window is reflected to a main light path through the reflector, and the main light path transmits the collected optical signal to a foundation high-rise atmospheric wind field measuring system; be provided with first sealing washer between side protection window and the safety cover body, be provided with the second sealing washer between zenith protection window and the safety cover body, be provided with the third sealing washer between safety cover body and the rotary platform for protect the light path environment.
Furthermore, the one-dimensional linear displacement platform is fixedly arranged on the rotary protective cover and used for realizing synchronous rotation of the reflector and the side protective window.
Furthermore, the one-dimensional linear displacement platform is fixedly arranged on the side wall of the protective cover body through a connecting frame.
Further, the reflector is a rectangular reflector, an elliptical reflector or a circular reflector.
Furthermore, the reflector is arranged in a reflector structure frame, and the reflector structure frame is connected with the output end of the one-dimensional linear displacement platform through a connecting plate.
Furthermore, the side protection window is arranged on the protection cover body in a side protection window pressing plate or sealing bonding mode.
Furthermore, the zenith protection window is arranged on the protection cover body in a zenith protection window pressing plate or sealing bonding mode.
Further, the zenith protection window is a circular window.
Further, the side protection window is a rectangular window or an oval window.
Compared with the prior art, the system has the following beneficial technical effects:
1. the system reduces the number of the reflecting mirrors required by scanning into one, greatly simplifies the structural complexity and difficulty of the system, and further reduces the overall volume and weight of the system. Meanwhile, the system replaces the belt transmission of the existing system with a rotary platform and a one-dimensional linear displacement platform, the system is simpler and easier to construct and realize, the rotating and positioning precision is higher, and the moving parts of the system are easier to maintain and realize quick replacement.
2. The parts where two reflectors of the existing system are located all need single-shaft rotation and combined rotation at a certain angle, the required movement range of the system is large, two groups of belt transmissions and two motors are exposed, and the whole size and weight are difficult to realize whole-system protection or the whole size and weight are increased sharply after the whole-system protection. The system reduces the number of the rotating parts into one, and brings the switching motion of the reflectors observed in the zenith direction and the east-west-south-north oblique direction into the rotating parts, so that the whole system has only one moving part when viewed from the outside, the protection of the system can be realized only by simply sealing the rotating part shell and the rotary platform shell and the base, and the difficulty of light path protection is greatly simplified.
Drawings
FIG. 1 is a schematic view of a measurement azimuth of a high-rise atmospheric wind field in a conventional foundation;
FIG. 2 is a schematic structural diagram of a conventional front scanning mirror mechanism;
FIG. 3 is a schematic view of a pre-scanning mirror system for measuring a high-rise wind field on a foundation.
Reference numerals are as follows: 1-reflector, 2-one-dimensional linear displacement platform, 3-rotary platform, 4-rotary protective cover, 5-rotary protective cover, 6-first sealing ring, 7-second sealing ring, 8-third sealing ring, 9-connecting frame, 10-reflector structural frame, 11-side protective window pressing plate, 12-zenith protective window pressing plate, 41-protective cover body, 42-zenith protective window, 43-side protective window, 101-first plane reflector, 102-second plane reflector, 103-first synchronous pulley system, 104-second synchronous pulley system and 105-light inlet.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention and are not intended to limit the scope of the present invention.
The invention provides a preposed scanning mirror system for measuring a foundation high-rise atmospheric wind field, which is a multi-view-field scanning mirror system with two degrees of freedom based on a rotary platform and a one-dimensional linear displacement platform and can meet the requirements of the foundation high-rise atmospheric wind field measurement on four-direction view fields of zenith, southeast, northwest and east. Compared with the prior art, the invention reduces two reflectors into one reflector, simplifies two belt transmission mechanisms into a rotary platform and a one-dimensional linear displacement platform, and greatly simplifies the complexity of the structure. In the prior art, if the zenith and east-west-south-north oblique observation needs to be realized, the purpose can be achieved only by matching the two belt rotating mechanisms, and the mechanism movement range caused by combined movement is more than twice of the size of the system, so that the space required by the whole system is greatly increased and the outdoor environment protection difficulty is extremely high.
As shown in fig. 3, the front scanning mirror system for measuring the wind field of the foundation high-rise atmosphere provided by the invention comprises a reflecting mirror 1, a one-dimensional linear displacement platform 2, a rotary platform 3, a rotary protective cover 4 and a rotary protective cover 5; the reflector 1 and the one-dimensional linear displacement platform 2 are both arranged in the rotary protective cover 4, the reflector 1 is connected with the output end of the one-dimensional linear displacement platform 2, and the one-dimensional linear displacement platform 2 drives the reflector 1 to cut into a main optical path; the one-dimensional linear displacement platform 2 is arranged on the rotary platform 3, and the rotary platform 3 drives the reflector 1 to rotate along the optical axis of the main optical path through the one-dimensional linear displacement platform 2; the rotary platform 3 is arranged on the mounting platform and used for being connected with a high-rise atmospheric wind field measuring system of a foundation, the rotary protective cover 4 comprises a protective cover body 41, a zenith protective window 42 and a side protective window 43, the zenith protective window 42 and the side protective window 43 are arranged on the protective cover body 41, the protective cover body 41 is arranged on the rotary platform 3, and the rotary platform 3 drives the rotary protective cover 4 to rotate along an optical axis of a main optical path; the zenith protection window 42 is coaxially arranged with the axis of the rotary platform 3 and the optical axis of the main optical path and is used for collecting optical signals in the zenith direction; the side protection window 43 is arranged on a reflection light path of the reflector 1 and synchronously rotates along with the reflector 1, an optical signal collected by the side protection window 43 is reflected to a main light path through the reflector 1, and the main light path transmits the collected optical signal to the ground high-rise atmospheric wind field measurement system. The reflector 1 and the one-dimensional linear displacement platform 2 can be directly connected with the rotary platform 3 or can be connected with the rotary platform 3 through the rotary protective cover 4, and particularly, the one-dimensional linear displacement platform 2 can be fixedly arranged on the side wall of the protective cover body 41 through the connecting frame 9 and used for realizing synchronous rotation of the reflector 1 and the side protective window 43.
In order to realize good sealing performance of the system, a rotary protection cover 5 is arranged on the outer side of the rotary platform 3, and the rotary protection cover 5 protects the rotary platform 3 and the main light path environment from being polluted by external environment; meanwhile, a first sealing ring 6 can be arranged between the side protection window 43 and the protection cover body 41, a second sealing ring 7 is arranged between the zenith protection window 42 and the protection cover body 41, and a third sealing ring 8 is arranged between the protection cover body 41 and the rotary platform 3, so that the light path environment is protected.
In the embodiment of the invention, the reflector 1 is arranged in a reflector structure frame 10, and the reflector structure frame 10 is connected with the output end of the one-dimensional linear displacement platform 2 through a connecting plate. The side protection window 43 may be a rectangular window or an oval window, and may be disposed on the protection cover body 41 by the side protection window pressing plate 11 or by sealing and bonding. The zenith protection window 42 may be a circular window, and may be disposed on the protection cover body 41 by the zenith protection window pressing plate 12 or by sealing and bonding.
The reflector 1 of the system is a rectangular reflector, an elliptical reflector or a circular reflector, the rectangular reflector is considered to reduce the size of the reflector 1 as much as possible under the condition of meeting the requirement of an optical field range, and according to the geometry, an optical footprint of a field of view on the mirror surface of the reflector is similar to an ellipse, so that the reflector is set to be rectangular, and the problem that the volume of a related structural support is enlarged to increase the weight of the whole scanning mirror system due to the fact that the invalid size of the lens is too much due to the arrangement of a conventional circular lens is solved.
The function and technical requirements of each component of the foundation high-rise atmospheric wind field multi-azimuth waterproof scanning mirror system are as follows:
the reflector 1 is used for introducing light rays with oblique angles into a main light path, the angle of the reflector 1 can be adjusted according to the requirement of the light path, and the reflector structure frame 10 is fixedly connected with the one-dimensional linear displacement platform 2 through a connecting plate.
The one-dimensional linear displacement platform 2 is used for connecting the reflector 1 and driving the reflector 1 to move in the direction which is horizontal and vertical to the optical axis of the main light path. The one-dimensional linear displacement platform 2 has two working positions, the reflector 1 at the first position is shifted out of a main light path view field, the main light path collects zenith direction signals, the reflector 1 at the second position is positioned in the main light path, and the main light path collects zenith direction signals. The one-dimensional linear displacement platform 2 is connected with the rotary platform 3 through a connecting frame 9.
The scanning protective cover assembly is used for introducing zenith, east-west, south-north oblique light signals and protecting the reflector 1 and a main light path environment from being polluted by external environment. The scanning protection cover assembly mainly comprises a zenith protection window 42, a zenith protection window pressing plate 12, an O-shaped ring, a side protection window 43, a side protection window pressing plate 11 and a protection cover body 41. The protective cover body 41 is connected with the one-dimensional linear displacement platform 2, and the zenith protective window 42, the side protective window 43 and the protective cover body 41 are sealed through O-shaped rings.
The rotary platform 3 is used for supporting the reflector 1 and the scanning protective cover assembly and driving the reflector 1 in the main light path to rotate around the main optical axis, so that the test system collects optical signals in east, west, south and north directions. The top of the rotary platform 3 supports the reflecting mirror 1 and the scanning protective cover assembly, and the lower part is connected with the mounting platform. The rotary protection cover 5 is used for protecting the rotary platform 3 and the main light path environment from being polluted by the external environment. The top of the rotary protection cover 5 and the connecting frame 9 of the one-dimensional linear displacement platform 2 are in dynamic sealing through an O-shaped ring, and the upper rotating part can keep sealing in rotary motion. The lower part of the rotary protective cover 5 is connected with the mounting platform through a flange and is sealed between the mounting platform and the O-shaped ring so as to ensure that the whole scanning mirror system is sealed and isolated from the external environment.
The invention discloses a preposed scanning mirror system for measuring a foundation high-rise atmospheric wind field, which adopts 1 rectangular reflector 1 as a light path turning element, the reflector 1 is fixed on a laterally arranged one-dimensional linear displacement platform 2 through a connecting plate, and the reflector 1 and the one-dimensional linear displacement platform 2 are combined and then fixed on a rotary platform 3 with a central hole through a connecting frame 9. Wherein the reflector 1 realizes the light path deflection and pointing alignment of four directions of east, west, south and north. The side one-dimensional linear displacement platform 2 drives the reflector 1 to realize the switching between two positions, when the reflector 1 is positioned at the first position, the reflector 1 is moved out of the main light path, and the measuring system can observe the zenith direction; when the reflector 1 is located at the second position, the measurement system can observe in a direction inclined by 45 degrees. At this time, the rotating platform 3 drives the reflector 1 and the one-dimensional linear displacement platform 2 to perform rotating motion, and controls the pointing alignment in the east, south, west and north directions. In order to meet the requirement of outdoor measurement, the system is provided with a sealed observation window in the zenith direction and the oblique direction, a rotary protective cover 4 is arranged on the periphery of the combination of the reflector 1 and the one-dimensional linear displacement platform 2, and a sealing mechanism is arranged between the rotary protective cover 4 and the rotary protective cover 5, so that the invasion of water vapor and dust is prevented while the motion function is ensured.
Claims (9)
1. A leading scanning mirror system that is used for high-rise atmospheric wind field of ground to measure which characterized in that: comprises a reflector (1), a one-dimensional linear displacement platform (2), a rotary platform (3), a rotary protective cover (4) and a rotary protective cover (5);
the reflector (1) and the one-dimensional linear displacement platform (2) are arranged in the rotary protective cover (4), the reflector (1) is connected with the output end of the one-dimensional linear displacement platform (2), the one-dimensional linear displacement platform (2) drives the reflector (1) to cut into a main light path, the reflector (1) is used for realizing light path turning and directional alignment of four directions of east, west, south and north, the one-dimensional linear displacement platform (2) drives the reflector (1) to realize switching between two positions, and when the reflector (1) moves out of the main light path, the measuring system can observe the zenith direction; when the reflector (1) is cut into the main light path, the measuring system can observe in a direction inclined by 45 degrees;
the one-dimensional linear displacement platform (2) is arranged on the rotary platform (3), and the rotary platform (3) drives the reflector (1) to rotate along the axial direction of the main light path through the one-dimensional linear displacement platform (2);
the rotary platform (3) is arranged on the mounting platform and used for being connected with a foundation high-rise atmospheric wind field measuring system, and the rotary protective cover (5) is arranged on the outer side of the rotary platform (3) and used for protecting the rotary platform (3) and a main light path environment from being polluted by external environment;
the rotary protection cover (4) comprises a protection cover body (41), a zenith protection window (42) and a side protection window (43), wherein the zenith protection window and the side protection window are arranged on the protection cover body (41), the protection cover body (41) is arranged on the rotary platform (3), and the rotary platform (3) drives the rotary protection cover (4) to rotate along the optical axis of the main optical path;
the zenith protection window (42) is coaxially arranged with the axis of the rotary platform (3) and the optical axis of the main optical path and is used for collecting optical signals in the zenith direction; the side protection window (43) is arranged on a reflection light path of the reflector (1) and synchronously rotates along with the reflector (1), an optical signal collected by the side protection window (43) is reflected to a main light path through the reflector (1), and the main light path transmits the collected optical signal to a foundation high-rise atmospheric wind field measuring system;
be provided with first sealing washer (6) between side protection window (43) and safety cover body (41), be provided with second sealing washer (7) between zenith protection window (42) and safety cover body (41), be provided with third sealing washer (8) between safety cover body (41) and rotary platform (3) for protect the light path environment.
2. The pre-scan mirror system for foundation high-rise atmospheric wind field measurement according to claim 1, wherein: the one-dimensional linear displacement platform (2) is fixedly arranged on the rotary protective cover (4) and used for realizing synchronous rotation of the reflector (1) and the side edge protective window (43).
3. The front-mounted scanning mirror system for foundation high-rise atmospheric wind field measurement according to claim 2, wherein: the one-dimensional linear displacement platform (2) is fixedly arranged on the side wall of the protective cover body (41) through a connecting frame (9).
4. The front scanning mirror system for foundation high-rise atmospheric wind field measurement according to claim 1, 2 or 3, characterized in that: the reflector (1) is a rectangular reflector, an elliptical reflector or a circular reflector.
5. The pre-scan mirror system for ground based high-rise atmospheric wind field measurement according to claim 4, wherein: the reflector (1) is arranged in a reflector structure frame (10), and the reflector structure frame (10) is connected with the output end of the one-dimensional linear displacement platform (2) through a connecting plate.
6. The front-mounted scanning mirror system for foundation high-rise atmospheric wind field measurement according to claim 5, wherein: the side protection window (43) is arranged on the protection cover body (41) in a side protection window pressing plate (11) or a sealing bonding mode.
7. The front-mounted scanning mirror system for foundation high-rise atmospheric wind field measurement according to claim 6, wherein: the zenith protection window (42) is arranged on the protection cover body (41) in a zenith protection window pressing plate (12) or a sealing bonding mode.
8. The front-mounted scanning mirror system for foundation high-rise atmospheric wind field measurement according to claim 7, wherein: the zenith protection window (42) is a circular window.
9. The front-mounted scanning mirror system for foundation high-rise atmospheric wind field measurement according to claim 8, wherein: the side edge protection window (43) is a rectangular window or an oval window.
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| CN1669079A (en) * | 2002-07-23 | 2005-09-14 | 皇家飞利浦电子股份有限公司 | Optical scanning device |
| CN101251417B (en) * | 2008-03-27 | 2010-04-14 | 中国科学院安徽光学精密机械研究所 | Hemi-spherical instrument for measuring sky brightness |
| CN101793563B (en) * | 2010-03-23 | 2011-07-20 | 中国科学院西安光学精密机械研究所 | Multiband infrared radiation automatic measuring system |
| CN201812129U (en) * | 2010-08-30 | 2011-04-27 | 南京信息工程大学 | All-sky imaging device of foundation |
| CN102297720B (en) * | 2011-05-26 | 2013-04-10 | 中国工程物理研究院应用电子学研究所 | Measuring apparatus for brightness of sky background |
| CN103163722B (en) * | 2013-02-21 | 2016-05-04 | 中山大学 | Three-dimensional image display systems based on micro display chip array and method |
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