CN105659870B - Return laser beam analog light source - Google Patents
Return laser beam analog light sourceInfo
- Publication number
- CN105659870B CN105659870B CN200510128159.2A CN200510128159A CN105659870B CN 105659870 B CN105659870 B CN 105659870B CN 200510128159 A CN200510128159 A CN 200510128159A CN 105659870 B CN105659870 B CN 105659870B
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- fibre bundle
- laser beam
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Abstract
The invention discloses a kind of return laser beam analog light source, comprise radome, fibre bundle, display card, spatial filter, iris diaphgram, collimating mirror that measured laser device or standard laser are housed. Fibre bundle contains multimode fibre and according to measuring content and fixed one or more groups single-mode fiber, fibre bundle receive end face be taking multimode fibre as background, single-mode fiber is as the sample region of pattern, multimode fibre output is received on described display card, and single-mode fiber output end face is then taking measurement group as unit partition arrangement. Fibre bundle receives end face and is arranged on the unthreaded hole position of radome by connector, the Laser output of single-mode fiber by spatial filter choose with iris diaphgram limit bundle after collimated by collimating mirror. The present invention can simulate the return laser beam of high uniformity, little beam divergence angle, micro-peak power density, not only may be used on laser SMI as standard sources, and the correlated performance that system can be carried out at the return laser beam of non-test field stimulation laser application system detects.<pb pnum="1" />
Description
Technical field
The present invention relates to a kind of laser system detecting instrument, especially relate to a kind of for Laser emission and reception systemThe laser eyepiece analog light source of system Performance Detection.
Technical background
Along with scientific and technical development, the application of laser instrument and laser system is more and more extensive, particularly comesMore weaponrys employ Laser Devices and laser system, the heavy antitank missile system as ChinaAdopt laser transmission system to realize guidance function, the searching/tracking apparatus of various weapon platforms is generally all adoptedBy range finder using laser or laser designator, along with the quickening of weapon modernization, as laser radar, sharpThe advanced weaponries such as light guide bomb also can be provided to Wo Jun all arms very soon. This means laser instrument, laserThe detection demand of systematic function also can increase substantially, both at home and abroad existing professional research unit of many families and factoryFamily is engaged in laser activity detecting instrument and to the research of the reference instrument that laser detection instrument is demarcated with openSend out. The national defence optical metrology first order station of China in 1998 develops pulse laser peak power standard set-up, usesIn laser peak power meter is demarcated and detection to laser pick-off parts. This standard set-up is by halfAfter directly collimating by optical system, the laser beam of conductor laser forms the standard sources of laser analog echo, byIn the pulse width of this return laser beam, at tens nanosecond orders, and sampling bore is relatively large, therefore byThe uniformity of the laser analog echo of optical alignment system exit is difficult to reach less than 20%. At present should in engineeringWith in, in order to verify that the performance of laser system is as the range capability of range finder using laser, the most frequently used way is,The target of range finder using laser directly being aimed at a known distance is carried out actual target practice to verify its range capability; ?When measuring the performance of laser radar, be the laser that laser transmitting antenna penetrates directly to be radiated to one have oneDetermine on lambert's scattering standard target surface of transmission shape, then receive its return laser beam by receiving system and carry out mutually externalField is detected. The major defect of above-mentioned outfield actual measurement method of operating is to be subject to the restriction of space, place, weather conditions,Need a large amount of man power and materials to implement testing experiment, and operation is easy to distortion factor to draw at a distanceEnter in measurement data. In addition, in laser application system, its laser pick-off parts often adopt area lessSensitive detection parts, this standard sources to laser analog echo proposes higher requirement, adopts at present existingOptical alignment laser standard sources in technology because its beam divergence angle is relatively large, peak power density is higher,Therefore the performance at the laser pick-off parts to this small size especially detects energy/its peak work to minimum laserWhen rate density is measured, often there is very large discreteness in its measurement result.
Summary of the invention
The technical problem to be solved in the present invention is, one is provided and has high uniformity, little beam divergence angle, micro-peak valueThe return laser beam analog light source of power density, this analog light source both can be used on laser SMI and doFor standard sources uses, system also can be carried out at the return laser beam of non-test field stimulation laser application systemCorrelated performance detects.
For solving the problems of the technologies described above, the present invention includes radome, fibre bundle, display card, spatial filter,Iris diaphgram, lens barrel, collimating mirror; Described radome is built with laser instrument, and this laser instrument both can be markThe standard laser of locating tab assembly instrument selection also can be the laser instrument in measured laser system; Described skyBetween wave filter, iris diaphgram, collimating mirror be arranged on successively in lens barrel, spatial filter is positioned at Jiao of collimating mirrorOn face, iris diaphgram is positioned on first plane of incidence of collimating mirror; Described fibre bundle comprises some equal lengthsMultimode fibre and the single-mode fiber of one or more measurement groups, wherein the length of single-mode fiber is greater than multimode lightFine length, each measurement group is containing one or more single-mode fiber, and it is with multimode fibre that fibre bundle receives end faceVertical input end face is the sample region that background, the vertical input end face of single-mode fiber are pattern; During test, optical fiberBundle receives end face and all can be received sharp by light hole place and sample region that connector is arranged on described radomeLight; Described display card contains the small through hole that be filled with display material, and the output of described fibre bundle is divided into twoPart: one is in the small through hole of multimode fibre output being received one by one on described display card; Two is described listsThe output of mode fiber is fixed on described spatial filter place by connector, and single-mode fiber is vertically defeatedGo out the single-mode fiber of the corresponding measurement group in end face partition arrangement Qie Yige district; The laser that single-mode fiber exports is logicalAfter crossing spatial filter and choosing, only allowed no more than in lasing beam diameter 5% its limit bundle by iris diaphgramHeart light beam arrives collimating mirror becomes the collimated light beam for measuring.
According to the present invention, debugging district is arranged to in the peripheral ring shaped region in fibre bundle receiving terminal surface sample district, itsInterior all vertical port arrangements by multimode fibre form, and the other end of these multimode fibres is connected on described demonstrationIn the outer shroud respective apertures of card.
According to the present invention, some described single-mode optical fiber length are equal, or are divided into not etc. some of lengthGroup, is through Accurate Calibration for the length of the single-mode fiber of range measurement.
Beneficial effect of the present invention is embodied in the following aspects:
(1) the present invention utilizes single-mode fiber to gather and transmits the laser energy that laser instrument exports, with existingIn technology, gathered laser energy by slit or aperture to compare, can not produce and have a strong impact on simulated light beam qualityDiffraction effect, in addition, the laser light field peak power density of single-mode fiber output of the present invention is to carry outIndependent strict demarcation, therefore adopts the present invention to carry out laser system performance measurement accurate measurement can be obtainedResult.
(2) many single-mode fibers are arrange to gather laser energy in the sample region of fibre bundle receiving terminal, withCertain some laser energy that directly gathers laser instrument output in prior art is compared, the sky of its simulated laser echoThe stability of territory distribution and time domain distribution is greatly improved, in addition, and its light of the laser being exported by single-mode fiberBundle bore is quite little, adds iris diaphgram and only allows beam energy density peak value to reach more than 95% comparatively flatThe light beam of smooth part as simulated laser echo, compared with beam exit bore relatively large in prior art,The present invention not only has higher uniformity, simultaneously less by its beam divergence angle of laser of collimating mirror outgoing.
(3) because the fibre core of single-mode fiber is very little, the laser energy through its collection and transmission is little, therefore,The measurement requirement of micro-peak power density can be met through its power density of laser of single-mode fiber output.
(4) not only structure is simple in the present invention, and can directly with the laser transmitting antenna of detected system withReception antenna is connected, and realizes Site Detection, a large amount of field trial funds can be saved.
Accompanying drawing explanation
Fig. 1 is composition and the principle schematic of return laser beam analog light source of the present invention.
Fig. 2 is fibre bundle input debugging district and the sample region schematic diagram of the shown return laser beam analog light source of Fig. 1.
Fig. 3 is that return laser beam analog light source of the present invention is for measuring the schematic diagram of laser radar performance parameter.
Fig. 4 is the shown return laser beam analog light source fibre bundle input spread pattern schematic diagram of Fig. 3.
Fig. 5 is subregion and the spread pattern figure of the shown return laser beam analog light source single-mode fiber bundle output of Fig. 3.
Detailed description of the invention
Below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in further detail.
According to Fig. 1, the present invention includes radome 1, fibre bundle 2, spatial filter 3, optical lens,Display card 6. Radome 1 is built with laser instrument 7, and this laser instrument 7 both can be that SMI is selectedStandard laser also can be the laser instrument in measured laser system. Spatial filter 3 is a 0.8mmAperture, it is connected with an one dimension or two-dimensional motion mechanism (not shown), can realize single-mode opticsThe selection in fine measurement of output end region. Optical lens is a general photographic film, wherein contains collimation thoroughlyMirror group 5 and aperture 4, aperture 4 is adjustable diaphragm of the present invention, and optical lens can by spatial filter 3The laser energy of selected surveyed area is collimated into simulated laser echo. The substrate of display card 6 adopts circuit board systemMake squarely, the display material that it is filled in aperture is the work of powdery infrared up-conversion material, display card 6Use except debugging is used, also the hot spot for visual examination laser distributes.
Fibre bundle 2 comprises the multimode fibre 8 of some equal lengths, some single-mode fibers 9, inputs connectPart, output connector, protective sleeve. One end of multimode fibre 8 and single-mode fiber 9 is by pressing plate and screwBe fixed on input connector, and end face is the middle form row for sample region C of debugging district T according to peripheryRow, what namely outer ring arranged is that multimode fibre 8 uses as debugging district T entirely, and middle part adopts multimode lightFibre 8 and single-mode fiber 9, by certain pattern form and ratio uniform distribution, form the sample region C to laser,It is square (see Fig. 2) that the final fibre bundle forming receives end face. The output of multimode fibre 8 passes through opticsIn the gluing corresponding aperture that is connected on display card 6, and outside the multimode fibre 8 that ensures to be positioned at debugging district T is connected onIn the aperture of circle. The output of single-mode fiber 9 is fixed on output connector by screw and pressing plate, rootReceive angle position, the pattern form partition arrangement of end face according to it at fibre bundle, form laser system differenceThe Performance Detection district of function, and choose (see Fig. 5) with what spatial filter 3 carried out detection zone. The present inventionAlso can, according to measuring content, single-mode fiber bundle output be made into the form of single detection zone, thus makeFibre bundle 2 becomes the dedicated connector of particular detection function and exchanges and use in the measurements. Be positioned at output to connectNear one section of fibre bundle fitting and output connector is wrapped in protective sleeve, and protective sleeve is black thermoplastic tube;Fibre bundle in the middle of being positioned at is wound on fiber reel. The all optical fiber that are arranged in input and output all will goThe layer of substitute, end face perpendicular cuts, bare fibre close parallel arranges and end face alignment.
Before measurement, input connector is fixed on radome 1 facula position showing by display card 6,The position of debugging laser 7 repeatedly, makes laser facula finally drop in the C of sample region. By output connectorBe fixed on and mostly be on adjustment rack, and single-mode fiber 9 output end face is positioned on the focal plane of optical lens. SurveyDuring amount, by changing the size of aperture 4, only allow to export 5% central light beam no more than single-mode fiber 9 and enterEnter collimation lens set 5, this guarantees with the formation of assigning to of the comparatively smooth beam portion of Energy distribution, height can be there isThe simulated laser echo of uniformity, little beam divergence angle, micro-peak power density.
Known according to the present invention, for different measurement contents, need different length single-mode fiber 9 andDifferent spread patterns. Example of the present invention is for measuring the range finding of Small object range finder using laserAbility, in this example, has 11 × 11 optical fiber, wherein has five to be single-mode fiber 9, these five listsMode fiber 9 is arranged in center and the cross of optical fiber square formation at fibre bundle input with the form of cross distributionThere is a single-mode fiber at center, and all the other dot matrix are multimode fibre 8; At the each single mode of single-mode fiber bundle outputOptical fiber 9 is pressed rods arranged in horizontal line. In this embodiment, five surveys of the five corresponding measurement of single-mode fiber range finder using lasersApart from distance, therefore the length of these single-mode fibers need to, according to the distance of measuring and Accurate Calibration, also be wanted simultaneouslyDecay multiplying power, the bore of aperture 4 and the proportionate relationship of Output of laser to this five optical fibers are demarcated. SurveyDuring amount, the laser instrument 7 of measured laser range finder is placed in radome 1, by adjusting spatial filter 3Motion, make spatial filter 3 move to corresponding single-mode fiber position and sample. Measure and terminateTime, the reading of range finder and corresponding aperture bore and the decay multiplying power of corresponding single-mode fiber are converted into laserLaser power density on optic fibre input end, judges the range capability of measured laser range finder with this.
Fig. 3 is that the present invention is for measuring an instantiation of laser radar performance parameter. This example has surveyRange gating, range resolution ratio, field of view of receiver angle, angular resolution equal parameter and the range finding of amount laser radarThe functions such as ability. This example has 25 × 25 optical fiber, and wherein sample region C has 19 × 19 optical fiber. GinsengSee Fig. 4, the spread pattern at its sample region of fibre bundle input C is, forms sampling taking center dot matrix as benchmarkThe rice wordline of district C, what be positioned at that dot matrix in meter wordline all arranges is single-mode fiber 9, the dot matrix outside rice wordlineOn all arrange be multimode fibre 8. The single-mode fiber that two oblique lines 10 of rice wordline arrange is used for measuring distanceFrom, the range finding optical fiber that oblique line 10 arranges has two kinds of length, i.e. 500m and 1000m, these two kinds of specificationsOn oblique line 10 alternately, one of center lattice arrangement can be measured the single-mode fiber of 4000m to optical fiber; OneWhat two dot matrix that bar oblique line Shang Yu center dot matrix is adjacent arranged is 1000m optical fiber, on another oblique lineWhat two dot matrix adjacent with center dot matrix arranged is 500m optical fiber. The epimere 11 of rice wordline vertical line arrangesBe to measure the single-mode fiber of technique of laser range gated, be divided into three groups, every group is two optical fiber, and its length is respectivelyFor gating is apart from plus/minus 1.5 times of range resolution ratios, the 4th group has three optical fiber as subsequent use. This example is at this lineThe fiber lengths that Duan Shangyou center dot matrix is upwards arranged in order is first group of 2006m, 1994m; Second group1006m, 994m; 3rd group of 206m, 194m; 4th group of 120m, 80m, 50m. Rice wordline vertical lineHypomere 13 arranges is the single-mode fiber of the measuring distance gating degree of accuracy, downward at this line segment Shang You centerThe fiber lengths that dot matrix is arranged in order be 600m, 400m, 300m, 200m, 100m, 90m, 80m,70m, 60m. What left section 14 of rice wordline horizontal line arranged is the single mode of measuring laser video rink corner and angular resolutionOptical fiber, the fiber lengths that this line segment Shang You center dot matrix is left arranged in order be 550m, 500m,450m, 350m, 300m, 250m, 100m, 50m, 30m. Right section 12 of rice wordline horizontal line arrangesBe the single-mode fiber of measuring laser distance resolution ratio, this line segment Shang You center dot matrix is to the right arranged in orderFiber lengths be 435m, 430m, 425m, 250m, 245m, 240m, 75m, 70m, 65m.See Fig. 5, the total Qi Ge of this example single-mode fiber output district, the first district 15 evenly distributed on oblique line 10Length is the optical fiber of 500m; The second district 16 evenly distributed the length optical fiber that is 1000m on oblique line 10;San district 17 is arranging the optical fiber that dot matrix Center Length is 4000m; Si district 18 evenly distributed on vertical lineFirst three groups optical fiber in section 11, its spread pattern is one group of a line; Wu district 19 is arranging vertical line hypomere 13On optical fiber; Liu district 20 evenly distributed the optical fiber on left section 14 of horizontal line, its spread pattern is cross hairs,What fiber lengths was close comes row or a line; SECTOR-SEVEN 21 evenly distributed the optical fiber on right section 12 of horizontal line,Its spread pattern is, is divided into three groups, arranges a line for every group according to putting in order of input. Single-mode fiber exportsLaser intelligence on end is entered in radar by laser radar reception antenna, laser radar just exportable distance,Orientation values, and the various performance parameters that judges laser radar according to these two groups of data.
Claims (3)
1. a return laser beam analog light source, comprises the radome [1], the spatial filter that are placed with laser instrument [7][3], iris diaphgram [4], lens barrel, collimating mirror [5], described spatial filter [3], iris diaphgram [4], collimationMirror [5] is arranged in lens barrel successively, and spatial filter [3] is positioned on the focal plane of collimating mirror [5], iris diaphgram [4]Be positioned on first plane of incidence of collimating mirror [5]; It is characterized in that: also comprise fibre bundle [2], display card [6], instituteThe standard laser that the laser instrument [7] of stating is selected for SMI, or the laser that is in measured laser systemDevice; Described fibre bundle [2] comprises the multimode fibre [8] of some equal lengths and the list of one or more measurement groupsMode fiber [9], wherein the length of single-mode fiber [9] is greater than the length of multimode fibre [8], and each measurement group is containing oneOr many single-mode fibers [9], it is taking the vertical input end face of multimode fibre [8] as background, list that fibre bundle receives end faceThe sample region [C] that the vertical input end face of mode fiber [9] is pattern; During test, fibre bundle receives end face by connectionLight hole place and sample region [C] that part is arranged on described radome [1] all can receive laser; Described demonstrationCard [6] contains the small through hole that be filled with display material, and the output of described fibre bundle [2] is divided into two parts: one isThe output of described multimode fibre [8] is received in the small through hole on described display card [6] one by one; Two is described single modesThe output of optical fiber [9] is fixed on described spatial filter [3] place by connector, and single-mode fiber [9] is verticalThe single-mode fiber of the corresponding measurement group in straight output end face partition arrangement Qie Yige district; Single-mode fiber [9] exportsAfter laser is chosen by spatial filter [3], only allowed no more than laser beam its limit bundle by iris diaphgram [4]The central light beam of diameter 5% arrives collimating mirror [5] becomes the collimated light beam for measuring.
2. return laser beam analog light source according to claim 1, is characterized in that: by described fibre bundleThe peripheral ring shaped region in receiving terminal surface sample district [C] be arranged to debugging district [T], in it all by multimode fibre [8]Vertical port arranges and forms, and the outer shroud correspondence that the other end of these multimode fibres [8] is connected on described display card [6] is littleKong Zhong.
3. return laser beam analog light source according to claim 1 and 2, is characterized in that: if describedDry root single-mode fiber [9] length is equal, or is divided into not etc. some groups of length, for the single mode of range measurementThe length of optical fiber [9] is through Accurate Calibration.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105659870B true CN105659870B (en) | 2011-07-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108572355A (en) * | 2018-04-04 | 2018-09-25 | 南京理工大学 | A kind of laser echo simulation device |
| CN108692918A (en) * | 2018-07-17 | 2018-10-23 | 中国人民解放军国防科技大学 | Device and method for evaluating time domain stability of high-power optical fiber laser system |
| CN110703231A (en) * | 2019-10-31 | 2020-01-17 | 中国人民解放军63921部队 | Dynamic polarization laser echo signal simulation system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108572355A (en) * | 2018-04-04 | 2018-09-25 | 南京理工大学 | A kind of laser echo simulation device |
| CN108572355B (en) * | 2018-04-04 | 2022-03-22 | 南京理工大学 | Laser echo simulation device |
| CN108692918A (en) * | 2018-07-17 | 2018-10-23 | 中国人民解放军国防科技大学 | Device and method for evaluating time domain stability of high-power optical fiber laser system |
| CN108692918B (en) * | 2018-07-17 | 2023-12-15 | 中国人民解放军国防科技大学 | Device and method for evaluating time domain stability of high-power fiber laser system |
| CN110703231A (en) * | 2019-10-31 | 2020-01-17 | 中国人民解放军63921部队 | Dynamic polarization laser echo signal simulation system |
| CN110703231B (en) * | 2019-10-31 | 2020-10-16 | 中国人民解放军63921部队 | Dynamic polarization laser echo signal simulation system |
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