CN106596053B - Point source transmitance veiling glare test macro and method with synchronization control function - Google Patents
Point source transmitance veiling glare test macro and method with synchronization control function Download PDFInfo
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- CN106596053B CN106596053B CN201610969961.2A CN201610969961A CN106596053B CN 106596053 B CN106596053 B CN 106596053B CN 201610969961 A CN201610969961 A CN 201610969961A CN 106596053 B CN106596053 B CN 106596053B
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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
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
Abstract
The present invention discloses a kind of point source transmitance veiling glare test macro and method with synchronization control function, belongs to veiling glare testing field.The pulse laser of light source outgoing is emitted directional light after parallel light tube collimates, and a part of light is directly entered optical-mechanical system to be measured, which is signal light；A portion light illuminates environment inner wall after optical-mechanical system surface scattering to be measured, then returns to optical-mechanical system to be measured by interior wall scattering, which is ambient light contamination.Relative to signal light, ambient light contamination must undergo longer light path and time to reach system image planes, have regular hour lag, and when signal light reaches system focal plane, synchronous control system controls detector shutter and opens, and receive signal light；And when ambient light contamination reaches system focal plane, shutter is in close state.Ambient light contamination can be effectively suppressed in the present invention, improves the precision of point source transmitance veiling glare test macro.
Description
Technical field
The present invention relates to Stray Light Test technical field more particularly to a kind of point source transmitances with synchronization control function
Test macro and method.
Background technique
Veiling glare refers to non-targeted, the non-imaged light beam for reaching optical system image planes, forms ambient noise on the detector, miscellaneous
The presence of light directly affects the contrast of image planes, reduces the signal-to-noise ratio of system, and serious person can make thrashing.
There are two ways to veiling glare measures: black-spot method and point source transmitance method.Black-spot method is suitable for optical-mechanical system building ring
Border is uniform bright background, such as ground photography system.Point source transmitance method is suitable for working environment veiling glare mainly from small light source
Optical-mechanical system, such as space remote sensing camera, star sensor etc., veiling glare is mainly from the sun, star etc..
Point source transmitance (PST, Point Source Transmittance) is defined as: the point source of the outer off-axis angle θ of visual field
Target emanation.The radiant illumination E generated after optical system in focal plane by light beamd(θ) and optical system inlet irradiation level Ei
Ratio calculation obtain.
Light pollution is that the stray light that veiling glare test macro itself is introduced with test macro and optical-mechanical system to be measured is counted into survey
The part of test result PST.The light pollution that wall scattering introduces in environment is the pass for limiting point source transmitance veiling glare test macro precision
One of key factor, existing point source transmission measurement system are that the influence of wall scattering in reduction environment usually requires that system has big survey
Try the inner wall in space, extremely low scattering, therefore the development cost of high-precision point source transmitance veiling glare test macro and later maintenance
Cost is very high.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of point source transmitance veiling glares at low cost and high measurement accuracy
Test macro and method.
The technical solution of the invention is as follows provides a kind of point source transmitance veiling glare test system with synchronization control function
System, further includes having outer synchronously control function including light-pulse generator system, parallel light tube and the ray machine to be measured set gradually along optical path
Detection system, signal acquiring processing system and the turntable of energy, above-mentioned optical-mechanical system to be measured or parallel light tube are located on turntable；It is above-mentioned
Detection system is located on the focal plane of ray machine to be measured, the signal of above-mentioned signal acquiring processing system acquisition detection system, especially it
Be in: further include synchronous control system, above-mentioned detection system and light-source system are connect with synchronous control system, above-mentioned synchronization
Control system is used for the unlatching according to the preset time control detection system shutter of delay and controls according to the shutter opening duration
The opening time of detection system shutter processed.Most short pass of the preset time of delay by light source through parallel light tube, optical-mechanical system to be measured
Path is broadcast to set；The shutter opening duration is by the veiling glare path of laser, parameter detector and optical-mechanical system to be measured Lai really
It is fixed.
For the dynamic range for extending veiling glare test macro, which further includes light attenuation device, above-mentioned optical attenuation dress
Setting in parallel light tube focal point.
Preferred light-pulse generator uses narrow-pulse laser, and for bore 200mm~500mm, system length is in meter level range
Optical-mechanical system to be measured, preferably use picosecond laser.
The point source transmitance veiling glare test method with synchronization control function that the present invention also provides a kind of, including following step
It is rapid:
Step 1: opening light source, and after distribution of light sources uniformity, time stability are met the requirements, calibration parallel light tube goes out
Penetrate the irradiation level E of collimated light beam0；
Step 2: positioning optical-mechanical system to be measured, so that by the directional light of parallel light tube outgoing full of optical-mechanical system to be measured
Entrance, and the entrance center of optical-mechanical system to be measured is made to cross the rotation center O of turntable；
Step 3: rotating table to the position specified off-axis angle θ；
Step 4: the laser pulse that light-pulse generator emits according to default launch time illuminates light to be measured after parallel light tube
Machine system, synchronous control system is using launch time as initial time, after the preset time of delay, issues and receives to detection system
Instruction, at this moment detection system shutter is opened, and receives signal light according to the preset shutter opening duration；Work as ambient light contamination
When reaching optical-mechanical system focal plane to be measured, synchronous control system controls detector shutter close, outside by ambient light contamination shielding；
Most short propagation path of the preset time of the delay by light source through parallel light tube, optical-mechanical system to be measured is set
It is fixed；
The shutter opening duration is by the veiling glare path of laser, parameter detector and optical-mechanical system to be measured Lai really
It is fixed；
Step 5: signal acquiring processing system calculating detector receives the irradiation level E (θ) of signal light, then off-axis angle θ
PST (θ)=E (θ)/(α E0)；
Step 6: rotating table angle repeats step 5, measures the response of detector under different off-axis angles, calculates not
With the PST under off-axis angle；
Step 7: the PST curve of optical-mechanical system to be measured is drawn.
Step 8: the curve is used to evaluate the stray light rejection ability of optical-mechanical system to be measured.
It further include the step of adjusting light attenuation device, dim light is enabled to be emitted after preferred step 1；
Step 4 further includes adjusting optical attenuation according to the theory analysis value of the point source transmitance PST (θ) of optical-mechanical system to be measured
The step of attenuation coefficient α of device.
The beneficial effects of the present invention are: the present invention uses synchronous control technique when signal light reaches system focal plane, it is synchronous
Control system controls detector shutter and opens, and receives signal light；And when ambient light contamination reaches system focal plane, shutter, which is in, to close
Closed state.Ambient light contamination can be effectively suppressed in the present invention, improves the precision of point source transmitance veiling glare test macro, and the present invention
Requirement of the veiling glare test test macro to environment is reduced, the construction and later maintenance cost of test macro is effectively reduced.
Detailed description of the invention
Fig. 1 is one schematic diagram of the course of work of present system；
Fig. 2 is two schematic diagram of the course of work of present system；
Appended drawing reference in figure are as follows: 1- light-pulse generator, 2- parallel light tube, 3- optical-mechanical system to be measured, 4- detection system, 5- are fast
Door, 6- turntable, 7- synchronous control system, the domestic wall of 8- test wrapper, 9- light trapping.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be further described.
As depicted in figs. 1 and 2, present system includes light-pulse generator 1, parallel light tube 2, optical-mechanical system to be measured 3, has outside
The pulse laser of the detection system 4 and synchronous control system 7 of synchronization control function, light source outgoing goes out after the collimation of parallel light tube 2
Directional light is penetrated, a part of light is directly entered optical-mechanical system 3 to be measured, through making to photometric system internal element diffraction, scattering or reflection
With system image planes are reached, which is signal light；Wherein another part light illuminates ring after 3 surface scattering of optical-mechanical system to be measured
Domestic wall (light beam a and b as shown in figure 1), then optical-mechanical system (light beam c and d in such as Fig. 2) to be measured, warp are returned to by interior wall scattering
Internal system element diffraction, scattering or reflex reach system image planes, which is ambient light contamination.Relative to signal
Light, ambient light contamination must undergo longer light path and time to reach system image planes, have regular hour lag, when signal light reaches
When to system focal plane, synchronous control system 7 controls detector shutter 5 and opens, and receives signal light；And when ambient light contamination reaches system
When system focal plane, shutter 5 is in close state.Ambient light contamination can be effectively suppressed in the present invention, improves the test of point source transmitance veiling glare
The precision of system.
Point source transmitance veiling glare test system and test process based on range gating is as follows:
1) pulsed laser light source is opened, after light stability, the Energy distribution that calibration parallel light tube 2 is emitted collimated light beam is equal
Even property, time stability and irradiation level E0；
2) light attenuation device is adjusted, decaying light source enables dim light outgoing (protection detector)；
3) optical-mechanical system 3 to be measured is positioned, guarantees the directional light being emitted by parallel light tube 2 entering full of optical-mechanical system 3 to be measured
Mouthful, and the entrance center of optical-mechanical system to be measured 3 crosses the rotation center of turntable 6；
4) rotating table 6 arrives the specified position off-axis angle θ；
5) according to the PST of examining system (θ) theory analysis value, the attenuation coefficient α of light attenuation device, parallel light tube 2 are adjusted
A part of collimated light beam of outgoing is directly entered optical-mechanical system 3 to be measured, the side such as diffraction, scattering or reflection through internal system element
Formula reaches system focal plane, and synchronous control system 7 controls detector shutter 5 and opens, and receives signal light；Another part light is through light to be measured
After 3 surface scattering of machine system, environment inner wall is illuminated, then return to optical-mechanical system to be measured through environment inner wall, through internal system element
The modes such as diffraction, scattering or reflection reach system focal plane, synchronous control system 7, which controls detector shutter 5 and is in, at this time closes
State, outside by ambient light contamination shielding；
6) the irradiation level E (θ) of signal light is received by signal acquiring processing system calculating detector, then off-axis angle θ
PST (θ)=E (θ)/(α E0)；
7) rotating table angle repeats step 5), measures the response of detector under different off-axis angles, calculates different off-axis
PST under angle；
8) the PST curve for being tested optical-mechanical system to be measured is drawn.
For the dynamic range for expanding veiling glare test macro, decaying dress can be arranged in test macro near focal surface of collimator tube
It sets, according to the PST theory analysis value of examining system, chooses attenuation coefficient appropriate.Laser light source preferably uses narrow-pulse laser such as
Picosecond laser, it is desirable that laser stability is good.Detector shutter speed reaches nanosecond order.Veiling glare test belongs to weak light detection,
Multi-frame accumulation can be used to improve the signal-to-noise ratio of detection system.
Claims (5)
1. a kind of point source transmitance veiling glare test macro with synchronization control function, including the pulsed light set gradually along optical path
Source system, parallel light tube and optical-mechanical system to be measured further include the detection system with outer synchronization control function, signal acquisition process
System and turntable, the optical-mechanical system to be measured or parallel light tube are located on turntable；The detection system is located at optical-mechanical system to be measured
Focal plane on, the signal of signal acquiring processing system acquisition detection system, it is characterised in that: further include synchronously control system
System, the detection system and light-source system are connect with synchronous control system, and the synchronous control system is used for according to delay
When preset time controls the unlatching of detection system shutter and controls the unlatching of detection system shutter according to the shutter opening duration
It is long；
The synchronous control system specific works engineering is as follows:
The laser pulse that light-pulse generator system emits according to default launch time illuminates optical-mechanical system to be measured after parallel light tube,
Synchronous control system is using launch time as initial time, after the preset time of delay, issues to detection system and receives instruction, this
When detection system shutter open, and receive signal light according to the preset shutter opening duration；When ambient light contamination reach to
When surveying optical-mechanical system focal plane, synchronous control system controls detector shutter close, outside by ambient light contamination shielding；
Most short propagation path of the preset time of the delay by light source through parallel light tube, optical-mechanical system to be measured is set；
The shutter opening duration is determined by the veiling glare path of laser, parameter detector and optical-mechanical system to be measured.
2. a kind of point source transmitance veiling glare test macro with synchronization control function according to claim 1, feature
It is: further includes light attenuation device, the light attenuation device is located at parallel light tube focal point.
3. a kind of point source transmitance veiling glare test macro with synchronization control function according to claim 1 or 2, special
Sign is: the light-pulse generator is picosecond laser.
4. a kind of point source transmitance veiling glare test method with synchronization control function, it is characterised in that: the following steps are included:
Step 1: opening light source, and after distribution of light sources uniformity, time stability are met the requirements, calibration parallel light tube outgoing is flat
The irradiation level E of row light beam0；
Step 2: positioning optical-mechanical system to be measured, so that the entrance of optical-mechanical system to be measured is full of by the directional light of parallel light tube outgoing,
And the entrance center of optical-mechanical system to be measured is made to cross the rotation center O of turntable；
Step 3: rotating table to the position specified off-axis angle θ；
Step 4: the laser pulse that light-pulse generator emits according to default launch time illuminates ray machine system to be measured after parallel light tube
System, synchronous control system is using launch time as initial time, after the preset time of delay, issues reception to detection system and refers to
It enables, at this moment detection system shutter is opened, and receives signal light according to the preset shutter opening duration；When ambient light contamination arrives
When up to optical-mechanical system focal plane to be measured, synchronous control system controls detector shutter close, outside by ambient light contamination shielding；
Most short propagation path of the preset time of the delay by light source through parallel light tube, optical-mechanical system to be measured is set；
The shutter opening duration is determined by the veiling glare path of laser, parameter detector and optical-mechanical system to be measured；
Step 5: signal acquiring processing system calculating detector receives the irradiation level E (θ) of signal light, then off-axis angle θ
PST (θ)=E (θ)/(α E0)；
Step 6: rotating table angle repeats step 5, measures the response of detector under different off-axis angles, calculate it is different from
PST under shaft angle degree；
Step 7: the PST curve of optical-mechanical system to be measured is drawn；
Step 8: the curve is used to evaluate the stray light rejection ability of optical-mechanical system to be measured.
5. a kind of point source transmitance veiling glare test method with synchronization control function according to claim 4, feature
It is:
It further include the step of adjusting light attenuation device, dim light is enabled to be emitted after step 1；
Step 4 further includes adjusting light attenuation device according to the theory analysis value of the point source transmitance PST (θ) of optical-mechanical system to be measured
Attenuation coefficient α the step of.
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| CN201610969961.2A CN106596053B (en) | 2016-10-28 | 2016-10-28 | Point source transmitance veiling glare test macro and method with synchronization control function |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107144421B (en) * | 2017-06-12 | 2023-08-18 | 中国科学院西安光学精密机械研究所 | Point source transmittance stray light test system and method based on time resolution |
| CN108169187A (en) * | 2017-12-15 | 2018-06-15 | 中国科学院西安光学精密机械研究所 | A kind of test cavity for point source transmission measurement |
| CN108226100A (en) * | 2018-01-15 | 2018-06-29 | 中国科学院西安光学精密机械研究所 | A kind of improvement cavity for point source transmission measurement |
| CN108982061B (en) * | 2018-06-12 | 2020-05-12 | 哈尔滨工业大学 | Automatic point source transmittance stray light testing system and method |
| CN111982467B (en) * | 2020-07-17 | 2021-07-27 | 中国科学院西安光学精密机械研究所 | Device and method for aligning optical axis of collimator and optical axis of optical-mechanical system in stray light test |
| CN114236510B (en) * | 2021-12-02 | 2023-06-23 | 桂林理工大学 | Laser radar transmissivity stray light test system for measuring water depth |
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