CN105929382A - Receiving and transmitting coaxial auxiliary light correction device and method for active photoelectric system - Google Patents
Receiving and transmitting coaxial auxiliary light correction device and method for active photoelectric system Download PDFInfo
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- CN105929382A CN105929382A CN201610236579.0A CN201610236579A CN105929382A CN 105929382 A CN105929382 A CN 105929382A CN 201610236579 A CN201610236579 A CN 201610236579A CN 105929382 A CN105929382 A CN 105929382A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
- G01S7/4972—Alignment of sensor
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Abstract
The invention discloses a receiving and transmitting coaxial auxiliary light correction device and method for an active photoelectric system, and is especially suitable for an auxiliary light correction process where there are transmitting and receiving optical systems at the same time, and is also suitable for other fields, such as the calibration of the normal of a plane mirror and the auxiliary light axis registering. The device is based on an auto-collimation function of a cube-corner prism, adjusts two laser beams to form a 180-degree inclined angle through the beam splitting function of a Beam Splitter, carries out the light axis registering of the simulation receiving echo of one laser beam and a receiving optical path and the light axis registering of the simulation transmitting light of the other laser beam and an actual transmitting light through employing the characteristic that the two laser beams form the 180-degree inclined angle, and achieves the coaxial installation and correction of the receiving and transmitting optical paths. The device is simple in structure, is low in cost, and is simple in calibration method.
Description
Technical field
The present invention relates to the performance test of laser actively photoelectric instrument and fill-in light calibration device and method, it is particularly well-suited to exist simultaneously and launches and during the auxiliary dress school of receiving optics, apply also for other fields, light school such as the demarcation of plane mirror normal, auxiliary optical axis registration.
Background technology
Laser remote sensing system is a kind of active modern photoelectric remote-sensing equipment, is that traditional radio or microwave radar (radar) are to the extension of optics frequency range.Due to shortening and the reinforcement of directionality of detection wavelength used, the space of system, time resolution are obtained for the biggest raising, suffer from being widely applied and in-depth study at the aspect such as military affairs, space flight, the earth mapping, engineering construction.Wherein, on airborne and spaceborne RS, laser enjoys favor with the good characteristic such as its high spatial resolution, high sensitivity, monochromaticjty is good, round-the-clock, has a wide range of applications in geoscience and planetary science field.The satellite borne laser remote sensing system the most developed mainly includes laser altimeter, range finder using laser, laser radar etc., laser remote sensing system can be with accurately detecting space length value, can be applied not only to the detection of celestial body surface three dimension height number, it is also possible to be applied to the tracking to extraterrestrial target, position and navigate.
Laser remote sensing system can be installed on the test platform such as aircraft, satellite, and it is mainly made up of laser emitting module, laser pick-off module and data processing module three part.In the detection target such as the ice cube that first laser that laser emitting module is launched got on ground, ocean surface, then it is reflected back on the test platform such as aircraft or satellite.Laser pick-off module receives the optical signal reflected, and converts it to as the signal of telecommunication.Data processing module can precisely measure out the time receiving laser from Laser emission to laser radar, and is exactly the laser transmission time in an atmosphere during this period of time.During this period of time, the stroke of laser walking be laser remote sensing system with detection target distance from twice.Along with expansion and the raising of application demand of laser remote sensing system range of application, detectivity and the stability of a system of system are required more and more higher by people, this also ground calibration and test performance to remote sensing system have higher requirement.The detectivity index of laser remote sensing system mainly includes system range accuracy, investigative range (maximum ranging distance, minimum ranging), resolution of ranging and detection probability (false alarm rate, false dismissed rate).And the change of optical axis registration will directly influence the detectivity of system, it can be tested by this instrument just requiring to have standard or equipment, and calibrates situation of change in time.Inquiry relevant laser remote sensing system is calibrated with measuring technology both at home and abroad document and data are learnt, each the laser remote sensing system abroad developed all can be equipped with a set of special test system, begins with special universal test system to this century；And the starting late of domestic satellite borne laser remote sensing system, the most existing is some method of testings for airborne laser range finder, these method of testings are concerned only with range capability test mostly, and test event is single, without the test equipment of special shaping, this can not meet the needs demarcating active laser remote sensing system.
Prism of corner cube is as a kind of inner full-reflection prism manufactured according to critical angle principle, and it is not affected by incidence angle size, is returned by direction efficiently by the incident ray arbitrarily entered in clear aperature.Present invention auto-collimation based on prism of corner cube function, two bundle laser are regulated to being mutually 180 ° by the light splitting function utilizing spectroscope (Beam Splitter), utilize the feature that two-beam is mutually 180 °, wherein light beam is simulated the echo received and carries out optical axis registration with receiving light path, another bundle optical analog is launched light and carries out optical axis registration with actual transmission light, thus realize receiving and dispatching light path coaxially fill school.
Summary of the invention
It is an object of the invention to provide a kind of transmitting-receiving coaxial fill-in light calibration device and the method for active electro-optical system, the use of this invention device, coaxial and the electro-optical system light school demand of off-axis transmitting can be met simultaneously, the feature of this invention is mainly reflected in: 1) simple in construction, can the state of testing auxiliary device at any time, method of testing is simple；2) parallelism of optical axis dress school and the test of different side-play amount can be met, it is also possible to meet dress school and the test of type coaxial photoelectric system.
Apparatus of the present invention are as shown in Figure 1:
First single-mode fiber the 1, second single-mode fiber 2 introduces LASER Light Source respectively, and the first single-mode fiber 1 introduces light and collimates outgoing through the first collimating mirror 3, then enters parallel light tube 7 imaging on focal plane laser beam analyzer 8 after spectroscope 5 reflects, and is recorded as image point position；Second single-mode fiber 2 introduces light and collimates outgoing through the second collimating mirror 4, reflect through spectroscope 5, prism of corner cube 6 enters parallel light tube 7 imaging on focal plane laser beam analyzer 8 after returning along original optical path again, regulating the second collimating mirror 4 makes the imaging point of two-beam overlap, and completes the dress school of this device.Remove prism of corner cube 6, the exit direction that final first single-mode fiber the 1, second single-mode fiber 2 introduces light becomes 180 degree, this invention device is finally collectively constituted by first single-mode fiber the 1, second single-mode fiber the 2, first collimating mirror 3 and the second collimating mirror 4, spectroscope 5, and can be used for receiving and dispatching and coaxially fill school.
Apparatus of the present invention may be used for transmitting-receiving coaxial fill-in light school and the transmitting-receiving parallelism of optical axis measurement of actively electro-optical system, and the method comprises the steps of:
1, fill-in light calibration device self-inspection
As shown in Figure 1, first single-mode fiber the 1, second single-mode fiber 2 introduces the LASER Light Source specified respectively, wherein the first single-mode fiber 1 introduces light and reflects through the first collimating mirror 3, spectroscope 5, second single-mode fiber 2 introduce light through the second collimating mirror 4, spectroscope 5 reflects, prism of corner cube 6 turns to, after spectroscope 5 transmission, two-beam together converges at focal plane on laser beam analyzer 8 through parallel light tube 7, detection two bundle laser finally on laser beam analyzer imaging facula whether overlap, fill-in light calibration device self-inspection is completed, prism of corner cube 6 of dismantling after confirming to overlap.
2, analogue echo registrates with reception optical axis
As shown in Figure 2, fill-in light calibration device (is included the first single-mode fiber 1, second single-mode fiber 2, first collimating mirror 3, second collimating mirror 4, spectroscope 5) it is positioned between receiving light path 10 and receiving telescope 11, regulation fill-in light calibration device is overall, make the first single-mode fiber 1 introduce LASER Light Source to launch along receiving telescope 11 0 visual field, make the second single-mode fiber 2 introduce LASER Light Source simultaneously and collimate outgoing through the second collimating mirror 4, receiving light path 10 is entered again after spectroscope 5 reflects, second single-mode fiber 2 introduces laser and is analogue echo, this analogue echo is utilized to dock with the receiving light path 10 of electro-optical system, it is maximum that regulation receiving light path 10 makes analogue echo detector after receiving light path 10 receive signal, complete analogue echo and the registration receiving optical axis.
3, analog transmissions registrates with Laser emission optical axis
First single-mode fiber 1 introduces LASER Light Source and collimates outgoing through the first collimating mirror 3, then reflects through spectroscope (5), and this reflection light is analog transmissions light, and this analog transmissions light becomes 180 degree with analogue echo optical axis, the most coaxial；Analog transmissions light is launched after beam-expanding system 11 again, and the direct paraxonic of transmitting light of laser transmitting system 9 is launched, two bundles launch light on the laser beam analyzer 8 of parallel light tube 7 post-concentration to focal plane, regulation laser transmitting system 9, two imaging faculas are overlapped, completing to launch optical axis to registrate with analog transmissions optical axis, auxiliary of dismantling dress calibration device, the transmitting-receiving completing actively electro-optical system coaxially registrates.
4, auxiliary transmitting-receiving parallelism of optical axis is measured
In step 3, before removing auxiliary dress calibration device, test two bundle launches light imaging facula position on laser beam analyzer 8 respectively, calculates two imaging spot center position deviations δ, then treat that the transmitting-receiving optical axis degree of regulation of examining system meets:
Wherein, f ' is the focal length of parallel light tube 7.
Owing to prism of corner cube exists certain rotating accuracy, this rotating accuracy is after beam-expanding system 11 is launched, and external droop is, expands multiple for beam-expanding system 11.
The present invention can not only meet coaxial type or be total to the measurement of light path type laser transmitting-receiving axiality, and can measure the depth of parallelism of the non co axial optical axis of different side-play amounts, and the feature of this invention is mainly reflected in:
1) apparatus of the present invention simple in construction, with low cost；
2) the inventive method is simple, auto-collimation function based on prism of corner cube, two bundle laser are regulated to being mutually 180 degree by the light splitting function utilizing spectroscope (Beam Splitter), utilizing two-beam to be mutually 180 degree of features assists transmitting-receiving coaxially to fill school, and this invention self-check of device method is the most effective；
3) present invention can meet the parallelism of optical axis dress school of different side-play amount, it is also possible to meets dress school and the test of type coaxial photoelectric system；
Accompanying drawing explanation
Fig. 1 is the transmitting-receiving coaxial fill-in light calibration device light school schematic diagram of actively electro-optical system.
Fig. 2 is the transmitting-receiving axis light school light path of actively electro-optical system.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of the inventive method is described in detail.
Main devices employed in the present invention is described as follows:
1) first single-mode fiber the 1, second single-mode fiber 2: using Thorlabs company model is the single-mode fiber of SM600, its Specifeca tion speeification: service band is 600-800nm；Fibre-optic mode field diameter is 4.6um@680nm, and covering core diameter 125 ± 1um is 550 ± 50nm by wavelength；
2) first collimating mirror the 3, second collimating mirror 4: using Thorlabs company model is the collimating mirror of 352280-B, its Specifeca tion speeification: service band is 600-1050nm；Focal length is 18.4mm, bore 6.5mm；Transmission material is ECO550；
3) spectroscope 5: the unpolarized Amici prism using Thorlabs company model to be BS017, its Specifeca tion speeification: service band is 700-1100nm；Splitting ratio is 1:1, and clear aperture is 20mm；
4) prism of corner cube 6: using Thorlabs company model is the prism of corner cube of PS971, its Specifeca tion speeification: face, transparent surface surface type is better than λ/10 632.8nm；Rotating accuracy is less than 3 ", clear aperture is 25.4mm.
5) parallel light tube 7: using the reflective parallel light pipe of customization, its Specifeca tion speeification: parallel light tube focal length is 5m, reflection paraboloid face type is better than λ/20@632.8nm；
6) laser beam analyzer 8: using Spiricon company of U.S. model is the laser beam analyzer of SP620, its Specifeca tion speeification: service band 190nm-1100nm, pixel size 4.4um*4.4um, number of pixels 1600*1200.
The dress school schematic diagram of apparatus of the present invention self is as it is shown in figure 1, specifically comprise the following steps that
1, the first single-mode fiber 1 and the combination regulation of the first collimating mirror 3: one end of the first single-mode fiber 1 introduces the LASER Light Source specified, the optical fiber other end and the first collimating mirror 3 dock, LASER Light Source converges at focal plane on laser beam analyzer 8 through parallel light tube 7 after collimating mirror collimates, regulation optical fiber front and back position makes imaging facula minimum, fixed transmission end fiber position, completes single-mode fiber 1 and combines with collimating mirror 3；
2, the second single-mode fiber 2 and the combination regulation of the second collimating mirror 4: control method is identical with step 1；
3, first single-mode fiber the 1, second single-mode fiber 2 introduces LASER Light Source respectively, wherein the first single-mode fiber 1 introduces light and collimates outgoing through the first collimating mirror 3, after spectroscope 5 reflects, enter parallel light tube 7 imaging on focal plane laser beam analyzer 8 again, be recorded as image point position；
4, the second single-mode fiber 2 introduces light and collimates outgoing through the second collimating mirror 4, reflect through spectroscope 5, prism of corner cube 6 enters parallel light tube 7 imaging on focal plane laser beam analyzer 8 after returning along original optical path again, regulating the second collimating mirror 4 makes the imaging point introducing light with the first single-mode fiber 1 overlap, remove prism of corner cube 6, the exit direction that final first single-mode fiber the 1, second single-mode fiber 2 introduces light becomes 180 degree, completes the dress school of invention device.
As shown in Figure 2, fill-in light school flow process is as follows for the fill-in light school schematic diagram of the inventive method:
1, fill-in light calibration device self-inspection: as shown in Figure 1, first single-mode fiber the 1, second single-mode fiber 2 introduces the LASER Light Source specified respectively, launching respectively through first collimating mirror the 3, second collimating mirror 4 collimation, the first collimating mirror 3 emergent light is directly entered parallel light tube 7 through spectroscope 5 reflection；Second collimating mirror 4 emergent light reflects through spectroscope 5, prism of corner cube turns to, enter parallel light tube 7 again after spectroscope 5 transmission, two-beam together converges at focal plane on laser beam analyzer 8, detection two bundle laser finally on laser beam analyzer 8 imaging facula whether overlap, fill-in light calibration device self-inspection, prism of corner cube of dismantling is completed after confirming to overlap.
2, analogue echo registrates with receiving optical axis: as shown in Figure 2, fill-in light calibration device (is included the first single-mode fiber 1, second single-mode fiber 2, first collimating mirror 3, second collimating mirror 4 and spectroscope 5) it is positioned between receiving light path 10 and receiving telescope 11, regulation fill-in light calibration device is overall, make the first single-mode fiber 1 introduce LASER Light Source to launch along receiving telescope 11 0 visual field, make the second single-mode fiber 2 introduce LASER Light Source simultaneously and enter receiving light path 10, second single-mode fiber 2 introduces laser and is analogue echo, regulate receiving light path 10 again, analogue echo detector after receiving light path 10 is made to receive signal maximum, complete analogue echo and the registration receiving optical axis.
3, analog transmissions registrates with Laser emission optical axis: the first single-mode fiber 1 introduces LASER Light Source and collimates outgoing through the first collimating mirror 3, reflect through spectroscope 5 again, this reflection light is analog transmissions light, and this analog transmissions light becomes 180 degree with analogue echo optical axis, the most coaxial；Analog transmissions light is launched after beam-expanding system 11 again, and the direct paraxonic of transmitting light of laser transmitting system 9 is launched, two bundles launch light on the laser beam analyzer 8 of parallel light tube 7 post-concentration to focal plane, regulation laser transmitting system 9 makes two bundle imaging faculas overlap, complete to launch optical axis to registrate with analog transmissions optical axis, auxiliary of dismantling dress calibration device, the transmitting-receiving completing actively electro-optical system coaxially registrates.
4, auxiliary transmitting-receiving parallelism of optical axis is measured: in step 3, before removing auxiliary dress calibration device, test two bundle launches light imaging facula position on laser beam analyzer 8 respectively, calculates two imaging spot center position deviations δ, then treat that the transmitting-receiving optical axis degree of regulation of examining system meets:
Wherein, f ' is the focal length of parallel light tube 7.
Owing to prism of corner cube exists certain rotating accuracy, this rotating accuracy is after beam-expanding system 11 is launched, and external droop is, expands multiple for beam-expanding system 11.System accuracy is the combined effect of two kinds of errors.
Claims (6)
1. a transmitting-receiving coaxial fill-in light calibration device for actively electro-optical system, including the first single-mode fiber (1),
Second single-mode fiber (2), the first collimating mirror (3), the second collimating mirror (4), spectroscope (5), pyramid rib
Mirror (6), parallel light tube (7), laser beam analyzer (8) are auxiliary conditioning unit, it is characterised in that:
First single-mode fiber (1), the second single-mode fiber (2) introduce LASER Light Source respectively, and wherein first is single
Mode fiber (1) introduces light and collimates outgoing through the first collimating mirror (3), then after spectroscope (5) reflects
Enter parallel light tube (7) and in the upper imaging of focal plane laser beam analyzer (8), be recorded as image point position；Second
Single-mode fiber (2) introducing light is through the second collimating mirror (4) collimation outgoing, then reflect through spectroscope (5),
Prism of corner cube (6) enters parallel light tube (7) along original optical path and in focal plane laser beam analyzer (8) after returning
Upper imaging, regulates the second collimating mirror (4) and the imaging point of two-beam is overlapped；Remove prism of corner cube (6),
Final first single-mode fiber (1), the second single-mode fiber (2) introduce the exit direction of light and become 180 degree, and
It is used for transmitting-receiving is coaxially carried out fill-in light school.
The transmitting-receiving coaxial fill-in light calibration device of a kind of active electro-optical system the most according to claim 1,
It is characterized in that: described the first single-mode fiber (1), the second single-mode fiber (2) core diameter are swashed with using
Radiant wavelength matches, and fiber end face is in the first collimating mirror (3), the focal plane of the second collimating mirror (4)
Position.
The transmitting-receiving coaxial fill-in light calibration device of a kind of active electro-optical system the most according to claim 1,
It is characterized in that: described the first collimating mirror (3), the second collimating mirror (4) surface form deviation RMS value are less than λ/10,
The refractive error of collimating mirror material is less than 2%.
The transmitting-receiving coaxial fill-in light calibration device of a kind of active electro-optical system the most according to claim 1,
It is characterized in that: described spectroscope (5) to use wavelength splitting ratio between 4:6 and 6:4,
Each logical light face surface form deviation RMS value is less than λ/10@632.8nm.
The transmitting-receiving coaxial fill-in light calibration device of a kind of active electro-optical system the most according to claim 1,
It is characterized in that: the rotating accuracy of described prism of corner cube (6) is less than 3 ".
6. transmitting-receiving coaxial fill-in light school based on a kind of active electro-optical system described in claim 1 dress
The transmitting-receiving coaxial fill-in light calibration method put, it is characterised in that method step is as follows:
1) auxiliary dress calibration device self-inspection: by the first single-mode fiber (1), the second single-mode fiber (2) respectively
Introduce the LASER Light Source specified, wherein the first single-mode fiber (1) introduce light collimate through the first collimating mirror (3),
Spectroscope (5) reflects, and the second single-mode fiber (2) introduces light through the second collimating mirror (4) collimation, light splitting
Mirror (5) reflection, prism of corner cube (6) turn to, after spectroscope (5) transmission, two-beam is together through flat
Row light pipe (7) converges on laser beam analyzer at focal plane (8), and detection two bundle laser is finally at beam analysis
On instrument, whether imaging facula overlaps, and completes fill-in light calibration device self-inspection, prism of corner cube of dismantling after confirming to overlap
(6)；
2) analogue echo registrates with receiving optical axis: it is accurate through second that the second single-mode fiber (2) introduces LASER Light Source
Straight mirror (4) collimation outgoing, then after spectroscope (5) reflects, this reflection light is analogue echo, profit
Docking with the receiving light path of electro-optical system with this analogue echo, regulation receiving light path makes analogue echo warp
Cross receiving light path and be followed by collection of letters maximum, complete analogue echo and the registration receiving optical axis；
3) analog transmissions and Laser emission optical axis registrate: the first single-mode fiber (1) introduces LASER Light Source through the
One collimating mirror (3) collimation outgoing, then reflect through spectroscope (5), this reflection light is analog transmissions light,
This analog transmissions light becomes 180 degree with analogue echo optical axis, the most coaxial, utilizes parallel light tube by mould
Sending out and penetrate light and practical laser and launch the optical axis of light and regulate to overlapping, auxiliary of dismantling fills calibration device, completes active
The transmitting-receiving of electro-optical system coaxially registrates.
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| CN105784335A (en) * | 2016-04-15 | 2016-07-20 | 中国科学院上海技术物理研究所 | Auxiliary light correction device and method for calibrating normal direction of reference mirror |
| CN107727368A (en) * | 2017-10-13 | 2018-02-23 | 中国科学院上海技术物理研究所 | A kind of device and method for demarcating focal surface of collimator tube position |
| CN107727008A (en) * | 2017-10-13 | 2018-02-23 | 中国科学院上海技术物理研究所 | A kind of active electro-optical system that measures receives and dispatches coaxial device and method |
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