CN104062097A - Device and method for calibrating return light characteristic of corner reflector - Google Patents
Device and method for calibrating return light characteristic of corner reflector Download PDFInfo
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Abstract
The invention relates to a device and a method for calibrating light return characteristics of a corner reflector. The device mainly comprises a light source assembly, a semi-transparent semi-reflecting mirror, a first detector assembly, a second detector assembly and an adjusting tool. In order to increase the reflectivity of the surface of the flying target to signals, a corner reflector array form is often adopted, and ideally, the light return efficiency of each corner reflector is consistent, so that the detector is convenient to select, and the subsequent data processing difficulty is reduced. The invention can realize the simultaneous measurement of the light return efficiency and the light return consistency of the corner reflector and has high measurement precision.
Description
Technical field
The invention belongs to optic test field, relate to a kind of for demarcating the corner reflector light echo characteristic device and method of (comprising light echo efficiency and light echo consistance).
Background technology
Corner reflector is commonly called as prism of corner cube, it is a kind of high-precision optical element, be widely used in laser ranging as cooperative target, coordinate Laser Distance Measuring Equipment, measure laser pulse from observation station to interval two-way time that triplane target is housed, calculate observation station to target range, realize precision ranging, can also utilize the parameters such as its movement velocity of laser Real-Time Monitoring, acceleration, track track, effectively follow the tracks of simultaneously.
Corner reflector is the important component part in laser distance measuring system, is widely used in the laser distance measuring system such as aircraft, artificial satellite, and be the gordian technique that realizes precision distance measurement and precise orbit determination.
One of key property of corner reflector be exactly from the light of incident in the certain limit of bottom surface after corner reflector reflection, from the reverse outgoing of the direction parallel with incident light direction, can guarantee the parallel of incident light and emergent light under certain condition.In order to increase the reflectivity of airbound target surface to signal, often adopt reflector array form.
No matter be single corner reflector or reflector array, all wish in actual use to incide it surperficial luminous energy is as much as possible and be reflected back, be conducive to like this be detected device and receive, improve measuring accuracy.The catoptrical ability of corner reflector is the light echo efficiency of corner reflector.
In addition, because corner reflector is when for cooperative target, normally several uses simultaneously, perfect condition is that the light echo efficiency of each corner reflector is all consistent, so that the type selecting of detector, and reduce follow-up data processing difficulty, so just require corner reflector light echo difference each other as far as possible little, namely the light echo consistance of a plurality of corner reflectors is tried one's best.Still be not specifically designed at present device or the method for the characteristic test of corner reflector light echo, there are no relevant open report yet.
Summary of the invention
In order to solve existing technical matters in background technology, the present invention proposes a kind of device and method for corner reflector test, can realize light echo efficiency and the light echo uniformity test of single corner reflector and reflector array.
Technical solution of the present invention is:
The method that this corner reflector light echo characteristic is demarcated comprises the following steps:
1] parallel beam is carried out to beam splitting, be divided into two-way light beam, be respectively reference beam and actual light beam; The energy value of direct test reference light beam, and be recorded as ξ
1, actual light beam is tested energy value after corner reflector reflection to be measured, and is recorded as ξ
2; The diameter of described parallel beam is less than or equal to corner reflector effective aperture, the optical axis of corner reflector to be measured and the optical axis coincidence of parallel beam;
Various dimensions adjustment is carried out in the position of 2] treating angle measurement reverberator, and every adjustment once remeasures the energy value of reference beam and actual light beam afterwards, obtains n group ξ
1iand ξ
i2;
3] by many group ζ
1iwith ζ i
2, calculate n light echo efficiency eta:
calculate light echo consistance:
Described τ is correction factor.
Correction factor τ in above-mentioned steps 3 obtains after the standard minute surface test by known absolute reflectance ρ, its specifically: parallel beam is carried out to beam splitting, is divided into two-way light beam, be respectively reference beam and actual light beam; The energy value of direct test reference light beam, and be recorded as ζ
1, actual light beam is tested energy value after the standard mirror-reflection of known absolute reflectance ρ, and is recorded as ζ
2, by
obtain correction factor τ; Described actual light beam is optical axis conllinear when optical axis should be with incident after reflection.
In above-mentioned steps 1, parallel beam being carried out to beam splitting is to implement by semi-transparent semi-reflecting lens; In described step 1, the diameter of parallel beam is adjusted to and is less than or equal to corner reflector effective aperture by iris.
Above-mentioned steps 1 is specifically: parallel beam incides on semi-transparent semi-reflecting lens, is divided into reference beam and actual light beam, and reference beam directly enters the first detector assembly through semi-transparent semi-reflecting lens front surface reflection and is converted into electric signal; Actual light beam sees through semi-transparent semi-reflecting lens and is irradiated to corner reflector to be measured surface, after reflection, by former direction, is back into and is mapped on semi-transparent semi-reflecting lens, by entering the second reception after the reflection of semi-transparent semi-reflecting lens rear surface, is converted into electric signal.
In above-mentioned steps 2, to treating the position of angle measurement reverberator, carry out various dimensions adjustment specifically: corner reflector to be measured is mounted to five dimensions and adjusts in frock, control five dimensions and adjust X translation stage and the horizontal rotating table interlock of frock, in corner reflector to be measured visual field, obtain many group ξ
1iand ξ
i2.
The device that this corner reflector light echo characteristic is demarcated, comprise for generating the light source assembly of parallel beam, semi-transparent semi-reflecting lens, for incident optical signal being converted into the first detector assembly and second detector assembly of electric signal, for carrying corner reflector to be measured or standard reflection mirror and driving corner reflector to be measured to carry out the adjustment frock of multidimensional adjustment; Described half anti-mirror is front surface near light source one side, away from light source one side, is rear surface, and parallel beam is incident to the first detector assembly through the part of front surface reflection, and parallel beam is incident to the second detector assembly through the part of rear surface reflection.
Above-mentioned the first detector assembly comprises successively convergent mirror and receives integrating sphere along optical path direction, being provided with photomultiplier on integrating sphere.
Above-mentioned adjustment frock is that five dimensions are adjusted frock, described five dimensions adjust frocks comprise three translation stages, for regulating optical axis to be incident to the tilting table of corner reflector pitch position to be measured and for making corner reflector to be measured rotate universal stage around optical axis, described three translation stages are respectively the Z direction translation stages for corner reflector to be measured is seesawed along optical axis, make the directions X translation stage of corner reflector vertical optical axis to be measured side-to-side movement, the Y-direction translation stage that corner reflector vertical optical axis to be measured is moved up and down.
Above-mentioned light source assembly comprises light source integrating sphere, LED lamp, optical filter target wheel, star tester and collimating mirror, and wherein optical filter target wheel, star tester and collimating mirror set gradually along light path.
Between above-mentioned light source assembly and semi-transparent semi-reflecting lens, be provided with for adjusting the continuous variable diaphragm of parallel beam diameter.
Advantage of the present invention is as follows:
Adopt continuous variable diaphragm and optical filter target wheel to coordinate the test of the corner reflector light echo efficiency that can simultaneously realize different bores, different operating spectral coverage, test specification is wide; In parallel light path, utilize cleat planes mirror light splitting Sampling techniques simultaneously, eliminated the measuring error that flashing is qualitative, environment is unstable and the reflection of level crossing secondary reflection surface second causes, and do not produced extra aberration; Adopt convergent lens and integrating sphere combination and lens focus is adjusted to integrating sphere porch to add aperture, realize the impact of eliminating light path veiling glare when wide dynamic range energy is harmless to be received; By software control full automation, measure, work efficiency improves greatly; Measuring accuracy is high, and light echo efficiency measurement repeatability is better than 0.5%, and coherence measurement precision is better than 1%.
Accompanying drawing explanation
Fig. 1 is the principle schematic of corner reflector light echo characteristic test device provided by the present invention;
Accompanying drawing is detailed as follows:
1-uniform source of light; 2-optical filter target wheel; 3-star tester; 4-collimating mirror; 5-continuous variable diaphragm; 6-semi-transparent semi-reflecting lens; The 7-the first convergent mirror I; 8-the first receives integrating sphere I; The 9-the first photomultiplier I; 10-automatically controlled universal stage; 11-five dimensions are adjusted frock; 12-measured angle reverberator; The 13-the second convergent mirror II; 14-the second receives integrating sphere II; The 15-the second photomultiplier II; 16-computing machine.
Embodiment
Caliberating device provided by the present invention comprises light source, integrating sphere, optical filter target wheel, and star tester, collimating optical system, iris, semi-transparent semi-reflecting mirror assembly, standard reflection mirror, automatically controlled universal stage, five dimensions are adjusted frock, the first detector assembly I, the second detector assembly II.
Wherein light source integrating sphere and LED lamp composition uniform source of light are arranged on behind collimating optical system focal plane, and star tester is arranged on collimating optical system position of focal plane, and iris is fixed on collimating optical system exit; Detector assembly comprises respectively a set of convergent mirror, receives integrating sphere and photomultiplier; Five dimensions are adjusted frock and are comprised three translation stages, a tilting table, a universal stage, can make corner reflector along optical axis seesaw (Z direction translation stage), vertical optical axis side-to-side movement (directions X translation stage), vertical optical axis move up and down (Y-direction translation stage), regulate optical axis pitch position (pitch tilt platform), and rotate (rolling angle universal stage) around optical axis.
Below in conjunction with concrete method of testing, describe in detail:
1] standard reflection mirror (known absolute reflectance is ρ) is arranged on special tooling, the correlation parameter of light source and detector is set;
2] light the LED light source of integrating sphere entrance, in integrating sphere exit, form uniform area light source, illuminate the star tester on collimating optical system focal plane, by becoming infinite distance parallel beam outgoing after collimating optical system;
3] parallel beam incides on semi-transparent semi-reflecting lens after by iris, is divided into two-way light beam, and a road directly enters detector assembly I through semi-transparent semi-reflecting lens front surface reflection, is called reference beam ζ
1; Another Reuter crosses semi-transparent semi-reflecting lens and is irradiated to standard reflection mirror surface, after reflection, by former direction, is back into and is mapped on semi-transparent semi-reflecting lens, by entering detector assembly II after the reflection of semi-transparent semi-reflecting lens rear surface, is called actual light beam ζ
2.
4] calculate correction factor
5] pull down standard reflection mirror, corner reflector is reliably arranged on to five dimensions and adjusts in frock, adjust and select iris size (iris diameter is less than or equal to corner reflector effective aperture);
6] regulate five dimensions to adjust frocks, make the logical optical surface of corner reflector drop on the centre of gyration of automatically controlled universal stage, optical axis and collimating optical system optical axis coincidence;
7], with step 3, now parallel beam incides on semi-transparent semi-reflecting lens after by iris, reference beam ξ
1directly enter detector assembly I; Actual light beam ξ
2through corner reflector, finally enter detector assembly II.
8] use Automatic Control and process software to control X translation stage and horizontal rotating table interlock, in corner reflector visual field, obtain a series of ξ
1iand ξ
i2.
9] use Automatic Control and process software to calculate the reverberator light echo efficiency under the different field angle in angle;
10] repeating step 6～9), the light echo efficiency of n corner reflector of test obtains n η
i:
calculate light echo consistance:
Uniform source of light by can light emitting source and integrating sphere form, its effect is to make the light uniformization that sends, evenly illuminates asterism, making the light beam through collimating mirror outgoing is uniformly, improves final test precision, light emitting source can be to provide the luminous object of any wavelength; The effect of optical filter target wheel is to be the monochromatic light of different wave length by the white light cut-off of light source outgoing, is equipped with according to the actual requirements the optical filter of different wave length, is arranged on the target wheel of a motion; Star tester and collimating mirror coordinate can provide infinity point target, and star tester is arranged on focal plane of collimating mirror place; The effective aperture that iris is used for changing test beams, can manual or automatically controlled adjustment to meet the test of different bore corner reflectors.
Semi-transparent semi-reflecting lens plated surface be semi-transparent semi-reflecting rete, effect is that collimated light beam is carried out to light splitting, a branch of reflection finally enters photomultiplier I afterwards, another bundle transmission finally enters photomultiplier II after corner reflector reflection; The effect of convergent mirror I and convergent mirror II is respectively two-way light beam to be assembled, and makes light beam can all enter reception integrating sphere, and the focus of convergent lens is receiving integrating sphere porch; Receiving integrating sphere effect is that light beam is all collected into photomultiplier; The effect of photomultiplier is to convert light signal to electric signal output, facilitates follow-up data processing, can be any type of electrooptical device.
The effect of automatically controlled universal stage is that the adjustment function of orientation angles is provided for measured angle reverberator, completes the test job of corner reflector light echo performance when the incident of different angles light beam.
The effects that five dimensions are adjusted frocks are to support measured angle reverberator, and realize corner reflector position accurate adjustment, can be manual can be also electronic control; The control that five dimensions are adjusted each moving component of frock realizes the state of real-time monitoring device by Automatic Control and process software, storage test figure, calculate light echo efficiency the curve plotting of corner reflector under different angles, calculate the light echo consistance between different corner reflectors, finally generate test report.
Claims (10)
1. the method that corner reflector light echo characteristic is demarcated, is characterized in that, comprises the following steps:
1] parallel beam is carried out to beam splitting, be divided into two-way light beam, be respectively reference beam and actual light beam; The energy value of direct test reference light beam, and be recorded as ξ
1, actual light beam is tested energy value after corner reflector reflection to be measured, and is recorded as ξ
2; The diameter of described parallel beam is less than or equal to corner reflector effective aperture, the optical axis of corner reflector to be measured and the optical axis coincidence of parallel beam;
Various dimensions adjustment is carried out in the position of 2] treating angle measurement reverberator, and every adjustment once remeasures the energy value of reference beam and actual light beam afterwards, obtains n group ξ
1iand ξ
i2;
3] by many group ζ
1iwith ζ i
2, calculate n light echo efficiency eta:
calculate light echo consistance:
Described τ is correction factor.
2. the method that corner reflector light echo characteristic according to claim 1 is demarcated, it is characterized in that: the correction factor τ in described step 3 obtains after the standard minute surface test by known absolute reflectance ρ, it is specifically: parallel beam is carried out to beam splitting, be divided into two-way light beam, be respectively reference beam and actual light beam; The energy value of direct test reference light beam, and be recorded as ζ
1, actual light beam is tested energy value after the standard mirror-reflection of known absolute reflectance ρ, and is recorded as ζ
2, by
obtain correction factor τ; Described actual light beam is optical axis conllinear when optical axis should be with incident after reflection.
3. the method that corner reflector light echo characteristic according to claim 2 is demarcated, is characterized in that: in described step 1, parallel beam being carried out to beam splitting is to implement by semi-transparent semi-reflecting lens; In described step 1, the diameter of parallel beam is adjusted to and is less than or equal to corner reflector effective aperture by iris.
4. the method that corner reflector light echo characteristic according to claim 3 is demarcated, it is characterized in that: described step 1 specifically: parallel beam incides on semi-transparent semi-reflecting lens, be divided into reference beam and actual light beam, reference beam directly enters the first detector assembly through semi-transparent semi-reflecting lens front surface reflection and is converted into electric signal; Actual light beam sees through semi-transparent semi-reflecting lens and is irradiated to corner reflector to be measured surface, after reflection, by former direction, is back into and is mapped on semi-transparent semi-reflecting lens, by entering the second detector assembly after the reflection of semi-transparent semi-reflecting lens rear surface, is converted into electric signal.
5. the method that corner reflector light echo characteristic according to claim 4 is demarcated, it is characterized in that: in described step 2, to treating the position of angle measurement reverberator, carry out various dimensions adjustment specifically: corner reflector to be measured is mounted to five dimensions and adjusts in frock, control five dimensions and adjust X translation stage and the horizontal rotating table interlock of frock, in corner reflector to be measured visual field, obtain many group ξ
1iand ξ
i2.
6. the device that a corner reflector light echo characteristic is demarcated, it is characterized in that: comprise for generating the light source assembly of parallel beam, semi-transparent semi-reflecting lens, for incident optical signal being converted into the first detector assembly and second detector assembly of electric signal, for carrying corner reflector to be measured or standard reflection mirror and driving corner reflector to be measured to carry out the adjustment frock of multidimensional adjustment; Described half anti-mirror is front surface near light source one side, away from light source one side, is rear surface, and parallel beam is incident to the first detector assembly through the part of front surface reflection, and parallel beam is incident to the second detector assembly through the part of rear surface reflection.
7. the device that corner reflector light echo characteristic according to claim 6 is demarcated, is characterized in that: described the first detector assembly comprises successively convergent mirror and receives integrating sphere along optical path direction, being provided with photomultiplier on integrating sphere.
8. the device that corner reflector light echo characteristic according to claim 7 is demarcated, it is characterized in that: described adjustment frock is that five dimensions are adjusted frock, described five dimensions are adjusted frock and are comprised three translation stages, for regulating optical axis to be incident to tilting table and the universal stage for corner reflector to be measured is rotated around optical axis of corner reflector pitch position to be measured, described three translation stages are respectively the Z direction translation stages for corner reflector to be measured is seesawed along optical axis, make the directions X translation stage of corner reflector vertical optical axis to be measured side-to-side movement, the Y-direction translation stage that corner reflector vertical optical axis to be measured is moved up and down.
9. the device that corner reflector light echo characteristic according to claim 8 is demarcated, it is characterized in that: described light source assembly comprises light source integrating sphere, LED lamp, optical filter target wheel, star tester and collimating mirror, and wherein optical filter target wheel, star tester and collimating mirror set gradually along light path.
10. the device that corner reflector light echo characteristic according to claim 9 is demarcated, is characterized in that: between described light source assembly and semi-transparent semi-reflecting lens, be provided with for adjusting the continuous variable diaphragm of parallel beam diameter.
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Cited By (6)
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| CN104748945A (en) * | 2015-03-27 | 2015-07-01 | 中国科学院西安光学精密机械研究所 | System and method for detecting optical axis pointing consistency of corner reflector or corner reflector array |
| CN105092212A (en) * | 2015-07-10 | 2015-11-25 | 中国科学院西安光学精密机械研究所 | Array corner reflector pointing accuracy measurement system and method |
| CN106124162A (en) * | 2016-06-13 | 2016-11-16 | 首航节能光热技术股份有限公司 | A kind of portable mirror reflectance test instrument |
| CN109709078A (en) * | 2018-12-14 | 2019-05-03 | 中国科学院合肥物质科学研究院 | Transmission-type atmospheric visibility measuring device and method based on single-photon detecting survey technology |
| CN110567686A (en) * | 2019-10-11 | 2019-12-13 | 淮阴师范学院 | mirror surface quality detection device and detection method for large-aperture optical reflection telescope |
| CN113687520A (en) * | 2021-08-13 | 2021-11-23 | 青岛青源峰达太赫兹科技有限公司 | Large-field-depth terahertz imaging optical system |
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| CN104748945A (en) * | 2015-03-27 | 2015-07-01 | 中国科学院西安光学精密机械研究所 | System and method for detecting optical axis pointing consistency of corner reflector or corner reflector array |
| CN104748945B (en) * | 2015-03-27 | 2017-08-25 | 中国科学院西安光学精密机械研究所 | System and method for detecting optical axis pointing consistency of corner reflector or corner reflector array |
| CN105092212A (en) * | 2015-07-10 | 2015-11-25 | 中国科学院西安光学精密机械研究所 | Array corner reflector pointing accuracy measurement system and method |
| CN105092212B (en) * | 2015-07-10 | 2019-06-28 | 中国科学院西安光学精密机械研究所 | Array corner reflector pointing accuracy measurement system and method |
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| CN109709078A (en) * | 2018-12-14 | 2019-05-03 | 中国科学院合肥物质科学研究院 | Transmission-type atmospheric visibility measuring device and method based on single-photon detecting survey technology |
| CN109709078B (en) * | 2018-12-14 | 2021-07-06 | 中国科学院合肥物质科学研究院 | Transmission-type atmospheric visibility measuring device and method based on single photon detection technology |
| CN110567686A (en) * | 2019-10-11 | 2019-12-13 | 淮阴师范学院 | mirror surface quality detection device and detection method for large-aperture optical reflection telescope |
| CN110567686B (en) * | 2019-10-11 | 2024-03-29 | 淮阴师范学院 | Mirror quality detection device and detection method for large-caliber optical reflection telescope |
| CN113687520A (en) * | 2021-08-13 | 2021-11-23 | 青岛青源峰达太赫兹科技有限公司 | Large-field-depth terahertz imaging optical system |
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