CN109737886B - Array photoelectric system for measuring deformation of reflecting surface connecting point of main antenna of radio telescope - Google Patents
Array photoelectric system for measuring deformation of reflecting surface connecting point of main antenna of radio telescope Download PDFInfo
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Abstract
The invention discloses an array photoelectric system for measuring the deformation of a reflecting surface connecting point of a main antenna of a radio telescope, which is used for measuring the deformation of the reflecting surface connecting point of the main antenna of the radio telescope PT-70 (Suffa). The base unit comprises an objective lens with a fastener, a CMOS array receiver with an adjusting device, 3 substrates and 3 columns, wherein the objective lens and the array receiver are respectively fixed on the substrates, the 3 columns are used for ensuring the rigidity of the base unit, the objective lens of each base unit faces the top of the antenna, and the angle between two adjacent main shafts is 15 degrees. The invention has the advantages of simple structure, large view field, deep scene, short working distance and the like, can realize the real-time measurement of multi-point displacement, and can measure the deformation condition of the connecting point of the reflection surface of the main antenna of the radio telescope PT-70 with the diameter of 70 m.
Description
Technical Field
The invention belongs to the field of optical measuring instruments, in particular to an array photoelectric system for measuring the deformation of a connecting point of a reflecting surface of a main antenna of a radio telescope.
Background
Radar measurement systems play an important role in detecting information about objects in the universe and require radar signals in the millimeter wavelength range. Many researchers are working on building radio telescopes to facilitate signal collection in the millimeter-scale band, such as in japan: NRAO 45, LMT 50 (mexico), SRT 64 (italy), GBT 100 (us) and china (nature eye), etc. Taking Russian radar system PT-70(Suffa) as an example, the radio telescope antenna is formed by embedding 1200 reflectors and has a diameter of 70 m. The construction of the existing parabolic antenna cambered surface has quite high technical performance requirements, the change of the antenna cambered surface along with the temperature or the change of the borne gravity can cause the deformation of each connecting surface or connecting point of the radar antenna cambered surface, and the error of the deformation can reach 30mm often. In order to measure errors automatically, a set of control system is needed to compensate according to deformation data of each connection point of the real radar antenna cambered surface. The most critical information in this set of control systems is: and under a relative standard state, the linear displacement condition between the reflecting surfaces of the cambered surface of the radar antenna is obtained.
With the progress of the production process and the optical measurement technology of the photoelectric instrument, people can use the photoelectric instrument to realize the preliminary detection of the remote high-speed measurement of the object space coordinate information. In 2015, wu et al proposed a novel laser theodolite measurement system based on a non-orthogonal axis system to reduce the error of the measurement system, and within 3m of the measurement radius, the measurement accuracy of the Pauta standard is ± 1 mm. A novel coherent interference dual-frequency laser radar combines laser and radio detection and ranging range, and the limited measuring range of range and speed measurement limits the application of a radar system PT-70 (Suffa). Wu et al propose a multiple heterodyne method for absolute distance measurement using a frequency comb and a tunable laser. By adjusting the repetition frequency of the comb teeth, the range of the non-ambiguity can reach 105 meters. However, the measurement accuracy can only be ensured up to a range of 30 meters. In 2017, long-distance measurement of an outdoor baseline as long as 1.2km is realized through electro-optical double-comb mutual measurement, but the measurement system is susceptible to temperature and is not beneficial to simultaneously measuring a plurality of parts.
Disclosure of Invention
The present invention is directed to solving the above problems of the prior art. An array photoelectric system for measuring the deformation of the reflecting surface connecting point of a main antenna of a radio telescope is provided and researched, is used for measuring the deformation of the reflecting surface connecting point of the main antenna of the radio telescope PT-70(Suffa), and comprises 24 basic units positioned on a PT-70 main antenna base ring and infrared laser light sources fixed on the connecting points of the reflecting surfaces of a plurality of PT-70 main antennas.
Further, the basic units comprise an objective lens with a fastener, a CMOS array receiver with an adjusting device, 3 substrates and 3 columns, wherein the objective lens and the CMOS array receiver are respectively fixed on the substrates, the 3 columns are used for fixing the substrates and ensuring the rigidity of the basic units, the objective lens of each basic unit faces the top of the main antenna, and the angle between the main axes of two adjacent basic units is 15 degrees.
Furthermore, each main antenna reflection surface connection point is a connection point formed by intersecting 4 adjacent reflection surfaces, and an infrared laser light source is fixed on each connection point and used as an aiming target. The laser beam emitted by the infrared laser light source is focused on the focal plane of the corresponding CMOS receiver through the objective lens. By detecting the displacement of the laser beam image, the deformation of the connecting point can be measured. As can be seen from fig. 3, the image analyzer of the basic unit comprises an objective lens and 19 receivers composed of CMOS arrays, and each basic unit can detect the deformation of the connection points on the 19 radar antennas. Therefore, the measurement system based on 24 basic unit arrays can realize the measurement of 24 × 19-456 connection points.
Further, the field of view of the basic unit in the meridian plane and the sagittal plane is 2 omega respectively162 ° and 2 ω216 deg.. For PT-70(Suffa), the radio telescope antenna is formed by embedding 1200 reflectors, the diameter of the antenna is 70m, therefore, the array photoelectric system can comprehensively measure the deformation of the connection point of the reflecting surface on the main antenna, and the angle view structure of the radar main mirror system is shown in FIG. 4.
Further, the experimental device for measuring the deformation of the main antenna reflecting surface connecting point by the array photoelectric measuring system further comprises a Standa vibrator and two optical sighting devices (comprising a fixed device and a device connected to the vibrator). One of the optical sights B is mounted on the vibrator while the other optical sight a is fixed. The optical sight a and the vibrator are fixed on the main antenna.
Further, the experimental device is further simplified, and an image analyzer of a basic unit comprises a CMOS array receiver composed of 5 CMOS and an objective lens with a focal length of 450mm, as shown in the figure5, respectively. 5 CMOS array receivers using OV05620 color CMOS QSXGA with 2592 x 1944 pixels with a pixel size of (2.2 x 2.2) μm2。
Further, the deformation caused by the micro-vibration of the vibrator is utilized to simulate the deformation of the main antenna reflecting surface connecting point, and the optical sighting device B arranged on the vibrator measures the deformation of the vibrator by detecting the imaging deviation of the infrared laser beam. The optical sight a is fixed for monitoring the stability of the air. If the air is stable, the infrared laser beam will not be deflected after passing through the optical sight A on the CMOS array receiver.
The invention has the following advantages and beneficial effects:
the construction of the existing parabolic antenna cambered surface has quite high technical performance requirements, the change of the antenna cambered surface along with the temperature or the change of the borne gravity can cause the deformation of each connecting surface or connecting point of the radar antenna cambered surface, and the error of the deformation can reach 30mm often. In order to measure errors automatically, a set of control system is needed to compensate according to deformation data of each connection point of the real radar antenna cambered surface. The most critical information in this set of control systems is: and under a relative standard state, the linear displacement condition between the reflecting surfaces of the cambered surface of the radar antenna is obtained.
The innovation lies in that the array photoelectric system for measuring the deformation of the connecting point of the reflecting surface of the main antenna of the radio telescope is provided, is used for measuring the deformation of the connecting point of the reflecting surface of the main antenna of the radio telescope PT-70(Suffa), and comprises 24 basic units positioned on a main mirror base ring and a plurality of infrared laser light sources fixed on the connecting point of the reflecting surface of the main antenna of the PT-70. The basic unit used in the invention comprises an objective lens with a fastener, a receiver consisting of 19 CMOS arrays with adjusting devices, 3 substrates and 3 columns, wherein the objective lens and the array receiver are respectively fixed on the substrates, the 3 columns are used for ensuring the rigidity of the basic unit, the objective lens of each basic unit faces to the top of the radar antenna, and the angle between two adjacent main shafts is 15 degrees. The invention has the advantages of simple structure, large view field, deep scene, short working distance and the like, can realize real-time measurement of multi-point displacement, can measure the deformation condition of the connecting point of the reflection surface of the main antenna of the radio telescope PT-70 with the diameter of 70m, and provides an opportunity for developing large rotatable radio telescopes in the millimeter wave range.
Drawings
FIG. 1 is a schematic diagram of an array optoelectronic measurement system of the present invention;
FIG. 2 is a diagram of the internal structure of the basic cell of the array of the present invention;
FIG. 3 is a schematic view of a measurement cell according to the present invention;
FIG. 4 is a perspective view of the primary radar mirror system of the present invention;
FIG. 5 is a schematic view of an experimental apparatus according to the present invention;
FIG. 6 is an internal block diagram of the basic cell of the array with 5 CMOS array receivers of the present invention;
FIG. 7 is a graph of the coordinate measurement error of the optical sight of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and clearly with reference to the accompanying drawings. The described embodiments are only some of the embodiments of the present invention.
The technical scheme for solving the technical problems is as follows:
an array photoelectric system for measuring the deformation of a reflecting surface connecting point of a main antenna of a radio telescope is used for measuring the deformation of the reflecting surface connecting point of the main antenna of the radio telescope PT-70(Suffa), and comprises 24 basic units 1 positioned on a main antenna base ring 3 and a plurality of infrared laser light sources 2 fixed on the reflecting surface connecting point of the main antenna of the PT-70.
Further, the base unit 1 includes one objective lens 1-1 with a fastener 1-2, 19 CMOS array receiver 1-4 with an adjusting device 1-3, 3 substrates 1-5 and 3 posts 1-6, the objective lens 1-1 and the CMOS array receiver 1-4 are fixed on the substrates 1-5 respectively, the 3 posts 1-6 fix the 3 substrates 1-5 for ensuring the rigidity of the base unit 1, the objective lens 1-1 of each base unit 1 faces the top of the main antenna, and the angle between the main axes of two adjacent base units 1 is 15 °.
Furthermore, each connecting point is formed by intersecting 4 adjacent reflecting surfaces, and an infrared laser light source 2 is fixed on each connecting point as an aiming target. The laser beam emitted by the infrared laser light source 2 is focused on the focal plane of the corresponding CMOS receiver through the objective lens 1-1. By detecting the displacement of the laser beam image, the deformation of the connecting point can be measured. As can be seen from fig. 3, the image analyzer of the basic unit comprises an objective lens and 19 receivers composed of CMOS arrays, and each basic unit can detect the deformation of the connection points on the 19 radar antennas. Therefore, the measurement system based on 24 basic unit arrays can realize the measurement of 24 × 19-456 connection points.
Further, the field of view of the base unit 1 in the meridian plane and the sagittal plane is 2 ω, respectively162 ° and 2 ω216 deg.. For PT-70(Suffa), the radio telescope antenna is formed by embedding 1200 reflectors, the diameter of the antenna is 70m, therefore, the array photoelectric system can comprehensively measure the deformation of the connection point of the reflecting surface on the main antenna, and the angle view structure of the radar main mirror system is shown in FIG. 4.
Further, the experimental device for measuring the deformation of the main antenna reflecting surface connection point by the array photoelectric measuring system comprises an infrared laser light source (XD laser) produced by API, a vibrator 4 of Standa and two optical sights (including a fixed one and a vibrator connected thereto), wherein the optical sight B5-2 is installed on the vibrator 4, the optical sight A5-1 is fixed on the main antenna, and the vibrator 4 is also fixed on the main antenna. Vibrator, two optical sighting device.
Further, the experimental setup is simplified further, and an image analyzer of a basic unit comprises a receiver consisting of 5 CMOS arrays and an objective lens with a focal length of 450mm, as shown in fig. 5. 5 CMOS array receivers using OV05620 color CMOS QSXGA with 2592 x 1944 pixels with a pixel size of (2.2 x 2.2) μm2。
Further, the deformation of the main antenna reflecting surface connection point is simulated by using the deformation caused by the micro-vibration of the vibrator, and the optical sighting device B5-2 installed on the vibrator 4 measures the deformation of the vibrator 4 by detecting the deviation of the infrared laser beam image. Optical sight A5-1 is stationary and is used to monitor air stability. If the air is stable, the imaging of the infrared laser beam after passing through the optical sight A5-1 on the CMOS array receiver will not be skewed.
Further, the displacement of the image on the CMOS array receiver can be represented by equation (1):
X＝F(l)(1)
where X is the displacement of the point source image on the CMOS and l is the distance from the optical sight to the objective lens.
Determining the measured distance of an optical sight by the following formula
Where L5500 mm is the distance from the objective lens to the optical collimator and a 490mm is the distance from the objective lens to the CMOS array receiver in fig. 5. q is the measurement error:
further, the image of the infrared laser beam passing through the optical sighting device B moves within the range of 3mm, and the displacement of the optical sighting device B can be calculated according to the coordinate data of the image on the CMOS array receiver. The coordinate data of each measurement point on the CMOS array receiver of the base unit is photographed for 100 frames for recording the displacement of the optical sight a and the optical sight B. The performance statistics of the base unit were calculated using regression analysis and the experimental measurements are shown in fig. 7.
σ＝f(X)(4)
Where σ (in millimeters) is the root mean square of the measurement error q.
For a distance L of 5500mm, the maximum root mean square value is σ of 8.7 · 10-3mm. The expected error of L35000 mm is 0.05 mm. Element design and experiments show that the array measuring system can comprehensively measure the deformation condition of the antenna connection point.
The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (5)
1. The utility model provides a measure array optoelectronic system that reflection surface tie point of radio telescope main antenna warp which characterized in that: the device is used for measuring the deformation of the connecting point of the reflection surface of the main antenna of the radio telescope PT-70 and comprises 24 basic units (1) positioned on a PT-70 main antenna base ring (3) and infrared laser light sources (2) fixed on the connecting points of the reflection surfaces of the main antenna of the PT-70; the field of view of the basic unit (1) in the meridian plane and the sagittal plane are respectively 62 degrees and 16 degrees;
the basic unit (1) comprises an objective lens (1-1) with a fastener (1-2), a CMOS array receiver (1-4) with an adjusting device (1-3), 3 substrates (1-5) and 3 columns (1-6), wherein the objective lens (1-1) and the CMOS array receiver (1-4) are respectively fixed on the substrates (1-5), the 3 columns (1-6) are used for fixing the substrates (1-5) to ensure the rigidity of the basic unit (1), the objective lens (1-1) of each basic unit (1) faces to the top of a main antenna, and the angle between the main shafts of two adjacent basic units (1) is 15 degrees.
2. The array optoelectronic system for measuring the deformation of the connection point of the reflecting surface of the main antenna of the radio telescope according to claim 1, wherein: each main antenna reflecting surface connecting point is a connecting point formed by intersecting 4 adjacent reflecting surfaces, an infrared laser light source is fixed on each connecting point and used as a target, and laser beams emitted by the infrared laser light sources are focused on the focal plane of the corresponding CMOS receiver through an objective lens.
3. The array optoelectronic system for measuring the deformation of the connection point of the reflecting surface of the main antenna of the radio telescope according to claim 1 or 2, wherein: the optical sighting device further comprises a vibrator (4) and two optical sighting devices, wherein the optical sighting device B (5-2) is installed on the vibrator (4), the optical sighting device A (5-1) is fixed on the main antenna, and the vibrator (4) is also fixed on the main antenna.
4. The array optoelectronic system for measuring the deformation of the connection point of the reflecting surface of the main antenna of the radio telescope according to claim 1 or 2, wherein: the CMOS array receivers (1-4) consist of 19 CMOS receivers or 5 CMOS receivers.
5. The optoelectronic array system for measuring the deformation of the connection point of the reflection surface of the main antenna of the radio telescope according to claim 3, wherein: the deformation of the main antenna reflecting surface connecting point is simulated by using the deformation caused by the micro-vibration of the vibrator (4), and the optical sighting device B (5-2) arranged on the vibrator (4) measures the deformation of the vibrator (4) by detecting the imaging deviation of the infrared laser beam; the optical sight a (5-1) is stationary and is used to monitor the stability of the air.
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| EP0449337A2 (en) * | 1990-10-24 | 1991-10-02 | Kaman Aerospace Corporation | Range finding array camera |
| JP3658225B2 (en) * | 1999-01-06 | 2005-06-08 | 三菱電機株式会社 | Antenna measurement and adjustment equipment |
| CN101713639B (en) * | 2009-10-30 | 2011-11-16 | 中国科学院国家天文台南京天文光学技术研究所 | radio telescope co-phase detection method based on four-point support of quadrilateral subpanel |
| CN201522273U (en) * | 2009-11-03 | 2010-07-07 | 郑州辰维科技有限公司 | 13.7m millimeter-wave radio telescope antenna profile detecting equipment |
| CN102589425B (en) * | 2012-01-12 | 2014-01-15 | 中国科学院国家天文台 | Measuring method for unit panel of reflecting surface of spherical radio telescope |
| CN102607427A (en) * | 2012-03-27 | 2012-07-25 | 中国科学院国家天文台南京天文光学技术研究所 | Displacement sensor based on photoelectric imaging |
| CN103926548B (en) * | 2014-04-18 | 2016-09-28 | 中国科学院新疆天文台 | A kind of method of quick measurement radio telescope reflector precision |
| CN104048620B (en) * | 2014-07-04 | 2017-03-15 | 中国科学院国家天文台南京天文光学技术研究所 | A kind of Radio Telescope Antenna face shape absolute calibration apparatus and method |
| CN107036550A (en) * | 2016-12-01 | 2017-08-11 | 中国科学院国家天文台南京天文光学技术研究所 | Radio astronomical telescope Active Reflector edge sensor system and its detection method |
| CN108090306A (en) * | 2018-01-12 | 2018-05-29 | 西安电子科技大学 | A kind of deformed aerial minor face pattern method for fast reconstruction based on minor face structural strain |
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