CN210005211U - high-speed wind tunnel schlieren instrument focal spot monitoring and damping system - Google Patents
high-speed wind tunnel schlieren instrument focal spot monitoring and damping system Download PDFInfo
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- CN210005211U CN210005211U CN201920700827.1U CN201920700827U CN210005211U CN 210005211 U CN210005211 U CN 210005211U CN 201920700827 U CN201920700827 U CN 201920700827U CN 210005211 U CN210005211 U CN 210005211U
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Abstract
The utility model discloses an kind of high-speed wind-tunnel schlieren appearance focal spot monitoring shock mitigation system, include the laser focal spot coordinate data acquisition system based on PSD position sensor and the quick mirror control system that swings of two dimension based on PID control algorithm, the utility model discloses a data acquisition system of high accuracy gathers focal spot coordinate position, and the mirror controller that shakes controls shakes the off-target volume of mirror vibration correction light for mark the laser and incide the center of PSD position sensitive detector all the time, at the system at every turn power-on back, all can the automatic calibration parameter, confirm the stable condition of system and preserve, the power-on can the automatic calibration operation on the system, need not artificial intervention.
Description
Technical Field
The utility model relates to a facula monitoring and controlling technology field specifically is kinds of high-speed wind-tunnel schlieren appearance focal spot monitoring shock mitigation systems.
Background
Due to the complexity of vibration interference, the traditional passive vibration isolation technology is difficult to effectively isolate the ultralow frequency vibration signal of a precision equipment working platform, because the rigidity of a passive vibration isolation element is limited, the parameters of a vibration isolator cannot be adjusted in real time, an active vibration isolation system has a remarkable effect in isolating ultralow frequency vibration compared with a passive mode, but the engineering practicability is a certain distance of .
In a high-speed wind tunnel schlieren system, at the moment of opening and closing of a wind tunnel, environmental vibration caused by strong airflow impact and light path deflection caused by airflow disturbance can generate great influence on schlieren light paths.
SUMMERY OF THE UTILITY MODEL
In order to solve the image stabilization problem of schlieren instrument under the high-speed wind-tunnel operating mode, the utility model provides an kinds of high-speed wind-tunnel schlieren instrument focal spot monitoring shock mitigation systems.
The facula drift to the arrival target that the directional unstability of light beam caused in the remote transmission, shake the problem, the utility model discloses use quick pendulum mirror and position sensitive detector as main functional module, design tracker establishes the control system of quick pendulum mirror to acquire the required pivoted angle value of speculum, the light path imbalance that the compensation vibration arouses reaches the light path and stabilizes, reduces the light path shake, reduces the purpose of vibration.
The utility model discloses a technical solution for providing high-speed wind-tunnel schlieren instrument focal spot monitoring shock mitigation systems, its special character lies in that along the light path set gradually spectroscopes, main reflector, the mirror that shakes, pendulum mirror and second spectroscope, still include the mirror controller that shakes that is used for controlling the mirror that shakes to rotate, pendulum mirror controller that is used for controlling the pendulum mirror swing and set up calibration laser and visible light source in two incident light paths of spectroscope respectively, set up visible light camera and facula position acquisition processing system in two emergent light paths of second spectroscope respectively;
the central processor is connected with the swing mirror controller;
the calibration laser emitted by the calibration laser and the visible light emitted by the visible light source are combined by the spectroscope and then are incident to the main reflecting mirror, the light beam is reflected to the second spectroscope by the main reflecting mirror, the vibrating mirror and the swinging mirror in sequence, and the second spectroscope divides the light into two paths of calibration laser and visible light;
the calibration laser split by the second spectroscope is incident to the PSD position sensitive detector, the PSD position sensitive detector senses optical signals and inputs position information of light spots to the central processing unit in a light current mode, the central processing unit calculates output signals of the PSD position sensitive detector, position coordinates of the light spots on the PSD position sensitive detector are calculated, miss amount data are obtained, the miss amount data are fed back to the swing mirror controller, and the swing mirror controller controls the swing mirror to rotate, so that the calibration laser is located at the center position of the PSD position sensitive detector;
and the visible light rays split by the second beam splitter are incident to the visible light camera, and the visible light camera exposes and images the visible light rays.
, in order to increase the incident angle of the light beam, the system further includes a focusing lens set disposed in front of the PSD position sensitive detector, and the focusing lens set focuses the calibration laser to the PSD position sensitive detector.
, in order to improve the system stability by , the system further comprises a second main reflecting mirror which is positioned between the th main reflecting mirror and the galvanometer, wherein both the two reflecting mirrors are large-aperture reflecting mirrors.
, the calibration laser has wavelength of 905nm, belongs to infrared laser band, does not participate in visible light imaging, and is used as calibration light path light source, and the visible light source is wide spectrum light source in visible light band, such as LED.
, a diaphragm is disposed between the second beam splitter and the visible light camera.
The utility model has the advantages that:
1. the utility model discloses a PSD position sensor laser focal spot coordinate data acquisition system based on high accuracy and high speed, PID control two-dimensional quick pendulum mirror control system, realized the quick accurate correction to device miss distance, improved the precision and the bandwidth of light beam stability control, ensured in the complicated environment vibration that the adverse conditions arouse, the stability of schlieren image;
2. the utility model is provided with the light beam focusing device, which can improve the accuracy of the angle of incidence of the light beam, reduce the diameter of the focal spot at the tail end of the light path, improve the acquisition precision of the focal spot position, and further make the light beam of the incident schlieren image acquisition camera more stable;
3. the large-caliber plane reflector is installed, and the closed-loop control precision and the control bandwidth of the swing mirror can be ensured.
Drawings
Fig. 1 is a schematic view of the system of the present invention.
In the figure, 1-calibration laser, 2-visible light source, 3- th spectroscope, 4- th main reflector, 5-second main reflector, 6-galvanometer controller, 7-galvanometer, 8-galvanometer controller, 9-galvanometer, 10-second spectroscope, 11-focusing lens group, 12-PSD position sensitive detector, 13-central processor, 14-diaphragm and 15-visible light camera.
Detailed Description
The invention is described in with reference to the drawings and the specific embodiments:
the utility model reflects the calibrated laser and the visible light beam to the vibrating mirror and the swing mirror in sequence; splitting the light beam reflected by the oscillating mirror; the split calibration laser is subjected to position detection to obtain position information of a calibration laser spot, and the swing mirror is controlled to move according to the obtained position information of the calibration laser, so that the miss distance of the calibration laser spot is zero; the split visible light is incident on the visible light camera.
The method is implemented in the embodiment by the system shown in fig. 1:
as can be seen from FIG. 1, the system of the embodiment includes a calibration laser 1, a visible light source 2, a th spectroscope 3, a th main reflector 4, a second main reflector 5, a galvanometer controller 6, a galvanometer 7, a galvanometer controller 8, a galvanometer 9, a second spectroscope 10, a focusing lens group 11, a PSD position sensitive detector 12, a central processing unit 13, a diaphragm 14 and a visible light motor 15. the galvanometer 7 is used as a disturbing device of a focal spot monitoring damping device of a schlieren instrument. the galvanometer controller 6 controls the galvanometer 7 to disturb the light path, so as to stabilize the light path of the whole device, and the galvanometer 9 simulates the interference of air flow in a high-speed wind tunnel environment on the light path of the device, so that the light path of the whole device.
The calibration laser 1 emits calibration laser with wavelength of 905nm to a th spectroscope 3, the visible light source 2 emits wide-spectrum visible light to a th spectroscope 3, the th spectroscope 3 combines the calibration laser and the visible light and then emits the combined beam to a th main reflector 4, the th main reflector 4 reflects the beam to a second main reflector 5, the second main reflector 5 reflects the beam to a vibrating mirror 7, the vibrating mirror 7 reflects the beam to a swinging mirror 9, the swinging mirror controller 8 controls the swinging mirror 9 to swing at high speed to simulate the interference of a high-speed air hole, the swinging mirror 9 reflects the beam to a second spectroscope 10, the second spectroscope 10 divides the beam into two paths of calibration laser and visible light, the calibration laser enters a focusing lens group 11, the focusing lens group 11 focuses the calibration laser to a PSD position sensitive detector 12, the PSD position sensitive detector 12 senses a calibration laser light signal thereon, and the PSD position sensitive detector 12 uses the position information of the calibration laser light signal as IX+、IX-、IY+、IY-The output signal of the PSD position sensitive detector 12 is calculated by the central processing unit 13, the miss distance data is calculated, and the light spot position calculation formula is as follows:
and L is the side length of the square photosensitive surface of the PSD position sensitive detector, the central processing unit 13 feeds back the calculated light spot position information to the swing mirror controller 8, and the swing mirror controller 8 controls the swing mirror 9 to swing to correct the miss distance of light, so that the calibrated laser always enters the center of the PSD position sensitive detector. The visible light split by the second beam splitter 10 is incident to the visible light camera 15 through the diaphragm 14, and the visible light camera 15 exposes and images the visible light.
The utility model relates to a miss target volume parameter self-correcting PID control algorithm, at the system at every turn power-on back, but all the automatic calibration parameter, confirm the stable condition of system and save, the power-on of system can the automatic calibration operation, need not artificial intervention.
Claims (5)
- The system is characterized by further comprising a vibrating mirror controller (6) used for controlling the rotating of the vibrating mirror, a swinging mirror controller (8) used for controlling the swinging of the swinging mirror, a calibration laser (1) and a visible light source (2) which are respectively arranged in two incident light paths of the light splitter (3), a visible light camera (15) and a light spot position acquisition and processing system which are respectively arranged in two emergent light paths of the second light splitter (10), wherein the light spot position acquisition and processing system comprises a PSD position sensitive detector (12) and a central processing unit (13) which are sequentially arranged along the light paths;and the central processing unit (13) is connected with the swing mirror controller (8).
- 2. The focal spot monitoring and damping system of the high-speed wind tunnel schlieren instrument according to claim 1, characterized in that:the light spot position acquisition and processing system further comprises a focusing lens group (11) arranged in front of the PSD position sensitive detector (12), and the focusing lens group (11) focuses the calibrated laser to the PSD position sensitive detector (12).
- 3. The focal spot monitoring and damping system of the high-speed wind tunnel schlieren instrument according to claim 2, characterized in that:a second main reflecting mirror (5) located between the th main reflecting mirror (4) and the galvanometer mirror (7);the th main reflecting mirror (4) and the second main reflecting mirror (5) are large-caliber reflecting mirrors.
- 4. The focal spot monitoring and damping system of the high-speed wind tunnel schlieren instrument according to claim 3, characterized in that: the wavelength of the calibration laser (1) is 905 nm; the visible light source (2) is a wide spectrum light source with a visible light wave band.
- 5. The focal spot monitoring and damping system of the high-speed wind tunnel schlieren instrument according to claim 1, characterized in that: and the diaphragm is positioned between the second beam splitter (10) and the visible camera (15).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920700827.1U CN210005211U (en) | 2019-05-15 | 2019-05-15 | high-speed wind tunnel schlieren instrument focal spot monitoring and damping system |
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| CN201920700827.1U CN210005211U (en) | 2019-05-15 | 2019-05-15 | high-speed wind tunnel schlieren instrument focal spot monitoring and damping system |
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| CN210005211U true CN210005211U (en) | 2020-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207932A (en) * | 2019-05-15 | 2019-09-06 | 中国科学院西安光学精密机械研究所 | A kind of high-speed wind tunnel schlieren focal spot monitoring shock-dampening method and system |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207932A (en) * | 2019-05-15 | 2019-09-06 | 中国科学院西安光学精密机械研究所 | A kind of high-speed wind tunnel schlieren focal spot monitoring shock-dampening method and system |
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