CN114509236A - Scanning type flow field two-dimensional plane measurement focusing laser differential interferometer - Google Patents
Scanning type flow field two-dimensional plane measurement focusing laser differential interferometer Download PDFInfo
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- CN114509236A CN114509236A CN202210174354.2A CN202210174354A CN114509236A CN 114509236 A CN114509236 A CN 114509236A CN 202210174354 A CN202210174354 A CN 202210174354A CN 114509236 A CN114509236 A CN 114509236A
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- 238000005259 measurement Methods 0.000 title claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 59
- 230000001427 coherent effect Effects 0.000 claims abstract description 9
- 230000001360 synchronised effect Effects 0.000 claims description 36
- 238000012360 testing method Methods 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000035945 sensitivity Effects 0.000 claims description 9
- 238000013519 translation Methods 0.000 claims description 8
- 239000000523 sample Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/003—Alignment of optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/1805—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for prisms
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- Optics & Photonics (AREA)
- Fluid Mechanics (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Abstract
The invention relates to the field of flow field measurement and discloses a scanning type flow field two-dimensional plane measurement focusing laser differential interferometer which comprises an emitting light path section and a receiving light path section, wherein the emitting light path section comprises an emitting light path mirror group sleeve, and a coherent laser light source, a concave lens, a first polaroid, a first Wollaston prism and a first convex lens are sequentially arranged in the emitting light path mirror group sleeve; annular fixing frames are arranged outside the concave lens, the first polaroid, the first Wollaston prism and the first convex lens, and the annular fixing frames are connected with the knob and fixed on the sleeve of the emission light path mirror group. The invention effectively solves the problems that the collimation adjustment and the arrangement of the relative position between the optical lenses in the focusing laser differential interferometer in the prior art are complicated, time-consuming and incapable of performing space two-dimensional field scanning measurement on the incoming flow.
Description
Technical Field
The invention belongs to the field of flow field measurement, and particularly relates to a scanning type flow field two-dimensional plane measurement focusing laser differential interferometer.
Background
The wind tunnel test is one of important means of aerodynamic research, and the flow field information can not be captured without the support of flow field measuring equipment in the wind tunnel test process. The current quantitative wind tunnel test measurement means comprise a hot wire anemometer, a pulsating pressure sensor, a pitot probe and the like. However, the above measurement methods all have the disadvantages: the probe of the hot-wire anemometer is very fragile and is often damaged in the high-speed wind tunnel test process, the response frequency of the pulsating pressure sensor and the pitot probe is low, the probe cannot endure the high-temperature test environment, and the probe is not suitable for the wind tunnel test under the high-speed high-temperature incoming flow condition. Therefore, supersonic speed and hypersonic speed incoming flow density information can be obtained by the focusing laser differential interferometer at the present stage, and the focusing laser differential interferometer measures an incoming flow density field by using the interference and refraction principles of light, so that an invasive probe is not provided, additional interference and flow field information change of the flow field are not generated, and the probe damage is not generated. In addition, due to the focusing capability of the focusing laser difference, most of the flow field information of the non-sensitive area can be removed from the interested flow characteristics near the optimal position detected by the test optical path. The effective running time of supersonic and hypersonic wind tunnels is limited, and the existing focusing laser differential interferometer mainly has two problems: firstly, the transmitting light path and the receiving light path of the existing focusing laser differential interferometer are formed by combining a plurality of groups of lenses, a laser transmitter and a photoelectric sensor, and the collimation adjustment and the arrangement of the relative positions between the optical lenses are complicated, tedious and time-consuming, so that the measurement of different measuring points needs to be completed in different vehicle numbers, and the progress and the efficiency of the wind tunnel test are seriously limited. Secondly, the reason that the transmitting light path and the receiving light path of the existing focusing laser differential interferometer are limited by collimation adjustment is that the transmitting light path and the receiving light path are fixed on two sides of the incoming flow to be measured, the relative position of the transmitting light path and the receiving light path with the incoming flow is fixed, the incoming flow cannot be subjected to space two-dimensional field scanning measurement, and the development and application space of the technology is severely limited.
Disclosure of Invention
The invention provides a scanning type flow field two-dimensional plane measurement focusing laser differential interferometer, which aims to solve the problems that collimation adjustment and arrangement of relative positions between optical lenses in the focusing laser differential interferometer in the prior art are complex, tedious and time-consuming, and the incoming flow cannot be scanned and measured in a space two-dimensional field.
The invention adopts the specific scheme that: a scanning type flow field two-dimensional plane measurement focusing laser differential interferometer comprises an emitting light path section and a receiving light path section, wherein the emitting light path section comprises an emitting light path mirror group sleeve, and a coherent laser light source, a concave lens, a first polaroid, a first Wollaston prism and a first convex lens are sequentially arranged in the emitting light path mirror group sleeve; annular fixing frames are arranged outside the concave lens, the first polaroid, the first Wollaston prism and the first convex lens, and the annular fixing frames are connected with the knob and fixed on the sleeve of the emission light path mirror group.
The receiving optical path section comprises a receiving optical path mirror group sleeve, a second convex lens, a second Wollaston prism, a second polaroid and a photoelectric receiver are sequentially arranged in the receiving optical path mirror group sleeve, annular fixing frames are arranged outside the second convex lens, the second Wollaston prism and the second polaroid, and the annular fixing frames are connected with a knob and fixed on the receiving optical path mirror group sleeve.
The emission light path lens set sleeve and the receiving light path lens set sleeve are provided with long strip-shaped openings at one side.
One end of the receiving optical path mirror group sleeve is provided with a photoelectric receiver which is fixed at the center of the end surface of the receiving optical path mirror group sleeve.
The laser differential interferometer comprises a synchronous movement electric control system arranged on two sides of a light path.
The synchronous moving electric control system comprises a servo controller, a synchronous controller, a servo motor, a receiving side synchronous translation mechanism and a transmitting side synchronous translation mechanism; the servo controller controls the start-stop and running speed of the servo motors, the synchronous controller controls the synchronous operation of the two servo motors on the two sides of the transmitting light path and the receiving light path, and the servo motors push the receiving side and the transmitting side to move forwards and backwards synchronously.
And the synchronous moving electric control system drives the mechanisms on the two sides of the flow field to be detected to synchronously move on the track.
In the same channel of the laser differential interferometer, the measurement width Ls in the flow spreading direction from the wind tunnel follows Gaussian distribution, the central position of a measurement point area is most sensitive, and the sensitivity far away from the central point is smaller and smaller. When the sensitivity falls below a characteristic value of the Gaussian distribution, i.e. the sensitivity is below a maximum
It is considered to reach the non-test area of the optical path.
The coherent laser light source, the concave lens, the first polaroid, the first Wollaston prism and the first convex lens are coaxially arranged.
The second convex lens, the second Wollaston prism, the second polaroid and the photoelectric receiver are coaxially arranged.
Compared with the prior art, the invention has the following beneficial effects:
1. the coherent laser light source, the concave lens, the first polaroid, the first Wollaston prism and the first convex lens are arranged in the transmitting light path mirror group sleeve, and the second convex lens, the second Wollaston prism, the second polaroid and the photoelectric receiver are arranged in the receiving light path mirror group sleeve, so that the problems of complexity, complexity and time consumption caused by the fact that a transmitting light path and a receiving light path of the existing focusing laser differential interferometer are formed by combining a plurality of groups of lenses, a laser transmitter and a photoelectric sensor, and the light paths need to be rearranged when the collimation adjustment of the relative positions of the optical lenses and the wind tunnel test state are changed are solved.
2. The invention solves the problems that the transmitting light path and the receiving light path of the existing focusing laser differential interferometer are fixed on two sides of incoming flow to be measured due to the fact that collimation adjustment reasons are limited, the relative position of the transmitting light path and the receiving light path is fixed with the incoming flow, and space two-dimensional field scanning measurement cannot be carried out on the incoming flow.
3. According to the invention, the synchronous movement electric control system is arranged on two sides of the light path of the laser differential interferometer, and the servo motors and the moving mechanisms arranged below the lens cone base on two sides of the light path are driven to accurately move on a fixed track through the combined control of the servo controller and the synchronous controller, so that the synchronous accurate movement of the emission light path sleeve and the receiving light path lens group sleeve on two sides of the flow field is realized.
Drawings
FIG. 1 is a schematic diagram of the principle structure of a focused laser differential interferometer of the present invention;
FIG. 2 is a schematic structural diagram of a sleeve for transmitting light path in the present invention;
FIG. 3 is a schematic structural diagram of a sleeve of the receiving optical path lens set of the present invention;
FIG. 4 is a schematic structural view of the present invention;
FIG. 5 is a schematic view of a concave lens fixed in a sleeve of an emission optical path lens set according to the present invention;
wherein the reference numerals are respectively:
1-a coherent laser light source; 2-a concave lens; 3-a first polarizer; 4-a first wollaston prism; 5-a first convex lens; 6-a second convex lens; 7-a second wollaston prism; 8-a second polarizer; 9-a photoelectric receiver; 10-emission optical path lens set sleeve; 11-receiving optical path lens set sleeve; 12-a knob; 13-opening the long strip; 14-an optical window; 15-effective observation plane; 16-ring-shaped fixing frame.
Detailed Description
The present invention will be described in further detail below with reference to the attached drawings, and it should be clearly understood herein that the described embodiments are not all embodiments, and are provided only for the purpose of illustrating the present invention, and not for the purpose of limiting the same.
The invention provides a scanning type flow field two-dimensional plane measurement focusing laser differential interferometer, which comprises an emitting light path section and a receiving light path section, wherein the emitting light path section comprises an emitting light path mirror group sleeve 10, and a coherent laser light source 1, a concave lens 2, a first polaroid 3, a first Wollaston prism 4 and a first convex lens 5 are sequentially arranged in the emitting light path mirror group sleeve 10; an annular fixing frame 16 is arranged outside the concave lens 2, the first polaroid 3, the first Wollaston prism 4 and the first convex lens 5, the annular fixing frame 16 is connected with a knob 12, and the knob 12 is connected with the annular fixing frame 16 in a threaded mode, so that the annular fixing frame 16 is fixed on the emission light path mirror group sleeve 10. The receiving optical path section comprises a receiving optical path mirror group sleeve 11, a second convex lens 6, a second Wollaston prism 7, a second polaroid 8 and a photoelectric receiver 9 are arranged in the receiving optical path mirror group sleeve 11, annular fixing frames 16 are arranged outside the second convex lens 6, the second Wollaston prism 7, the second polaroid 8 and the photoelectric receiver 9, and the annular fixing frames 16 are connected with knobs 12 and fixed on the receiving optical path mirror group sleeve. Further, the annular fixing frames 16 are all provided with knobs 12 on the side surfaces, and the knobs 12 are connected with the annular fixing frames 16 in a threaded manner, so that the annular fixing frames 16 are fixed on the sleeve 11 for receiving the optical path mirror group.
In one embodiment, the annular fixing frame 16 is sleeved outside the optical element (i.e. the optical element is embedded in the annular fixing frame), and the knob is provided with a threaded rod, and the threaded rod is connected with the first optical element mounting seat sleeve in a threaded fit manner after extending into the elongated hole, so that the disassembly is convenient. Referring to fig. 4, the connection mode of the rest optical elements and the corresponding sleeves in the present invention is the same as the connection mode of the concave lens and the sleeve of the emission optical path lens group.
The invention fixes the position of each optical element in the light path by arranging the sleeve of the transmitting light path mirror group and the sleeve of the receiving light path mirror group, and simultaneously can more conveniently adjust the position of each optical element, thereby solving the problems that the transmitting light path and the receiving light path of the prior focusing laser differential interferometer are formed by combining a plurality of groups of lenses, a laser emitter and a photoelectric sensor, and the collimation adjustment and the arrangement of the relative position between the optical lenses are complicated and complicated.
The emission light path lens group sleeve 10 and the receiving light path lens group sleeve 11 are provided with long strip-shaped openings 13 on one side. The long strip-shaped opening is an L-shaped long strip-shaped opening or a rectangular opening, the axial opening of the L-shaped long strip-shaped opening is used for adjusting the relative position between optical lenses, the circumferential opening is used for more conveniently placing the lenses into the sleeve, the adjusting lens, the prism and the polaroid are convenient to move to a proper light path position, and a graduated scale is marked on the long strip-shaped opening for conveniently searching the correct position of the optical element in the light path. The lens, the prism and the polaroid are all arranged in an annular fixing frame, the side surfaces of all the annular fixing frames are provided with knobs which are used for fixing the relative positions of the optical elements in the sleeve of the transmitting light path mirror group and the sleeve of the receiving light path mirror group, after the position of the optical element is adjusted, the knob can be screwed down to be fixed at a certain position in the sleeve, by reasonably selecting each element forming the focusing laser differential interferometer, the proper parameters are ensured, the positions of each element are adjusted, the focus of a focusing area can be moved to a target measuring point, and in the same test train number, the emission light path mirror group sleeve and the receiving light path mirror group sleeve are fixed on the electric synchronous translation device to obtain density pulsation information of a series of target measuring points, so that the test efficiency is greatly improved, and correlation analysis can be performed through post-processing to obtain more flow field information.
One end of the sleeve 11 of the receiving optical path mirror group is provided with the photoelectric receiver 9, and the photoelectric receiver 9 is fixed at the central position of the end face of the sleeve 11 of the receiving optical path mirror group, so that the structure of the whole optical path is more compact, the movement is convenient, and the space is saved. The laser differential interferometer comprises a synchronous movement electric control system arranged on two sides of a light path. The synchronous moving electric control system comprises a servo controller, a synchronous controller, a servo motor, a receiving side synchronous translation mechanism and a transmitting side synchronous translation mechanism. And the synchronous moving electric control system drives the mechanisms on the two sides of the flow field to be detected to synchronously move on the track. The emission optical path lens group sleeve and the receiving optical path lens group sleeve are fixed on a base of the synchronous movement electric control system, the synchronous movement electric control system on two sides of the optical path drives servo motors arranged below the base on two sides of the optical path (the emission optical path lens group sleeve and the receiving optical path lens group sleeve) to accurately move on a fixed track through the combined control of a servo controller and the synchronous controller, and the synchronous movement of the emission optical path sleeve and the receiving optical path sleeve on two sides of a flow field is realized. The servo controller controls the start-stop and running speed of the servo motors, the synchronous controller controls the synchronous operation of the two servo motors on the two sides of the transmitting light path and the receiving light path, and the servo motors push the receiving side and the transmitting side to move forwards and backwards synchronously.
In the same channel of the laser differential interferometer, the measurement width Ls in the flow spreading direction from the wind tunnel follows Gaussian distribution, the central position of a measurement point area is most sensitive, and the sensitivity far away from the central point is smaller and smaller. When the sensitivity falls below a characteristic value of the Gaussian distribution, i.e. the sensitivity is below a maximum
It is considered to reach the non-test area of the optical path. And the synchronous moving electric control system drives the mechanisms on the two sides of the flow field to be detected to synchronously move on the track. The synchronous movement electric control system drives the servo motor plane movement errors on two sides of the light path to be not more than 1 mm. The synchronous movement electric control system drives servo motors on two sides of the optical path to move at the maximum speed of 1m/s in a plane mode, and the collimation of the whole optical path is kept not to be damaged in the synchronous translation process.
The coherent laser light source 1, the concave lens 2, the first polarizer 3, the first Wollaston prism 4 and the first convex lens 5 are coaxially arranged. The second convex lens 6, the second Wollaston prism 7, the second polaroid 8 and the photoelectric receiver 9 are coaxially arranged, and the space two-dimensional field scanning measurement of the incoming current is realized.
The invention is suitable for engineering wind tunnels and has the function of replacing and adjusting the optical lens in a short time. The invention uses the sleeve type design scheme, and has the functions of quick movement and adjustment while keeping the collimation degree of the light path, thereby comprehensively overcoming the defects that the transmitting light path and the receiving light path of the existing focusing laser differential interferometer are limited by collimation adjustment and are required to be fixed at two sides of the incoming flow to be measured, the relative position of the transmitting light path and the receiving light path with the incoming flow is fixed, the incoming flow cannot be scanned and measured in a space two-dimensional field, and the technical resistance of the development and application space of the technology is seriously limited.
The drawings and the explanation are only for one embodiment of the present invention, but the specific protection scope of the present invention is not limited to the above explanation, and any simple replacement or change within the technical idea of the present invention and the technical solution according to the present invention should be within the protection scope of the present invention.
Claims (10)
1. A scanning type flow field two-dimensional plane measurement focusing laser differential interferometer is characterized by comprising an emitting light path section and a receiving light path section, wherein the emitting light path section comprises an emitting light path mirror group sleeve (10), and a coherent laser light source (1), a concave lens (2), a first polaroid (3), a first Wollaston prism (4) and a first convex lens (5) are sequentially arranged in the emitting light path mirror group sleeve (10); the concave lens (2), the first polaroid (3), the first Wollaston prism (4) and the first convex lens (5) are all externally provided with an annular fixing frame (16), and the annular fixing frame (16) is connected with a knob (12) and fixed on the emission light path mirror group sleeve (10).
2. The scanning flow field two-dimensional planar measurement focusing laser differential interferometer according to claim 1, wherein the receiving optical path section comprises a receiving optical path mirror group sleeve (11), a second convex lens (6), a second wollaston prism (7), a second polarizer (8) and a photoelectric receiver (9) are sequentially arranged in the receiving optical path mirror group sleeve (11), annular fixing frames (16) are arranged outside the second convex lens (6), the second wollaston prism (7) and the second polarizer (8), and the annular fixing frames (16) are fixed on the receiving optical path mirror group sleeve (11) through connection with a knob (12).
3. The scanning flow field two-dimensional planar measurement focusing laser differential interferometer according to claim 2, characterized in that the emission optical path mirror set sleeve (10) and the receiving optical path mirror set sleeve (11) are provided with elongated openings (13) on one side.
4. The scanning flow field two-dimensional planar measurement focusing laser differential interferometer according to claim 2, wherein one end of the receiving optical path mirror set sleeve (11) is provided with a photoelectric receiver (9), and the photoelectric receiver (9) is fixed at the center of the end face of the receiving optical path mirror set sleeve (11).
5. The scanning flow field two-dimensional plane measurement focusing laser differential interferometer according to claim 2, characterized in that the laser differential interferometer comprises a synchronous moving electric control system arranged on both sides of the optical path.
6. The scanning flow field two-dimensional plane measurement focusing laser differential interferometer according to claim 5, wherein the synchronous moving electric control system comprises a servo controller, a synchronous controller, a servo motor, a receiving side synchronous translation mechanism and a transmitting side synchronous translation mechanism; the servo controller controls the start-stop and running speed of the servo motors, the synchronous controller controls the synchronous operation of the two servo motors on the two sides of the transmitting light path and the receiving light path, and the servo motors push the receiving side and the transmitting side to move forwards and backwards synchronously.
7. The scanning type flow field two-dimensional plane measurement focusing laser differential interferometer according to claim 6, wherein the synchronous moving electric control system drives the mechanisms on two sides of the flow field to be measured to synchronously move on the track.
8. The scanning flow field two-dimensional plane measurement focusing laser differential interferometer according to any one of claims 1 to 7, characterized in that in the same channel of the laser differential interferometer, the measurement width Ls along the wind tunnel inflow direction follows a Gaussian distribution, the central position of the measurement point area is most sensitive, the sensitivity at the points far away from the central position is smaller and smaller, and when the sensitivity is reduced below the characteristic value of the Gaussian distribution, namely the sensitivity is lower than the maximum value
It is considered to reach the non-test area of the optical path.
9. The scanning flow field two-dimensional planar measurement focusing laser differential interferometer according to claim 8, wherein the coherent laser light source (1), the concave lens (2), the first polarizer (3), the first Wollaston prism (4) and the first convex lens (5) are coaxially arranged.
10. The scanning flow field two-dimensional planar surveying focusing laser differential interferometer according to claim 9, characterized in that the second convex lens (6), the second wollaston prism (7), the second polarizer (8) and the photoelectric receiver (9) are coaxially arranged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210174354.2A CN114509236A (en) | 2022-02-25 | 2022-02-25 | Scanning type flow field two-dimensional plane measurement focusing laser differential interferometer |
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| CN202210174354.2A CN114509236A (en) | 2022-02-25 | 2022-02-25 | Scanning type flow field two-dimensional plane measurement focusing laser differential interferometer |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2154733Y (en) * | 1993-05-06 | 1994-02-02 | 陈南宁 | Combined toy for optical teaching |
| CN101008703A (en) * | 2006-01-26 | 2007-08-01 | 富士能株式会社 | Refractive optical unit |
| CN110686853A (en) * | 2019-10-18 | 2020-01-14 | 华中科技大学 | Focusing laser differential interferometer and non-intrusive method for measuring density pulsation of flow field of wind tunnel |
| CN112558313A (en) * | 2020-12-25 | 2021-03-26 | 哈尔滨工业大学 | Curved surface conformal light beam generating device for measuring PLIF flow field on surface of aircraft |
| CN112747891A (en) * | 2020-12-23 | 2021-05-04 | 中国航天空气动力技术研究院 | High-enthalpy airflow space resolution measuring device and method based on mid-infrared laser absorption spectrum |
| CN114047638A (en) * | 2021-11-29 | 2022-02-15 | 合肥埃科光电科技股份有限公司 | Optical lens installation and debugging device |
-
2022
- 2022-02-25 CN CN202210174354.2A patent/CN114509236A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2154733Y (en) * | 1993-05-06 | 1994-02-02 | 陈南宁 | Combined toy for optical teaching |
| CN101008703A (en) * | 2006-01-26 | 2007-08-01 | 富士能株式会社 | Refractive optical unit |
| CN110686853A (en) * | 2019-10-18 | 2020-01-14 | 华中科技大学 | Focusing laser differential interferometer and non-intrusive method for measuring density pulsation of flow field of wind tunnel |
| CN112747891A (en) * | 2020-12-23 | 2021-05-04 | 中国航天空气动力技术研究院 | High-enthalpy airflow space resolution measuring device and method based on mid-infrared laser absorption spectrum |
| CN112558313A (en) * | 2020-12-25 | 2021-03-26 | 哈尔滨工业大学 | Curved surface conformal light beam generating device for measuring PLIF flow field on surface of aircraft |
| CN114047638A (en) * | 2021-11-29 | 2022-02-15 | 合肥埃科光电科技股份有限公司 | Optical lens installation and debugging device |
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