CN207675937U - Laser range finder verification system based on error cancellation principle - Google Patents
Laser range finder verification system based on error cancellation principle Download PDFInfo
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Abstract
The utility model belongs to dimensional measurement device calibrating installation technical field,It is related to a kind of laser range finder calibrating installation,Especially a kind of laser range finder verification system and its calibration method based on error cancellation principle,Including a verification table,One fixation adjusting apparatus will be installed in the fixing end of the verification table,For fixing laser range finder to be checked in the fixation adjusting apparatus,After the fixed adjusting apparatus fixes laser range finder to be checked,One is equipped in the verification table from walking target vehicle,Mobile reflection device should be installed from walking target car,The side for being located at fixed adjusting apparatus in the verification table fixing end is equipped with reflecting target and at least one fixation reflex device,The rear end for being located at mobile reflection device from walking target car is equipped with a measurement speculum,One laser interferometer is installed in the end of the verification table far from fixing end,The laser beam for measuring speculum and being used for the transmitting of reflection laser interferometer.
Description
Technical field
The utility model belongs to dimensional measurement device calibrating installation technical field, is related to a kind of laser range finder calibrating dress
It sets, especially a kind of laser range finder verification system based on error cancellation principle.
Background technology
With the continuous development of geometry test technology, Technology of Precision Measurement is measured from stock size and is constantly surveyed to large scale
Amount development, 20 years especially nearly, the measurement range of fine measuring instrument has reached more than ten meters, tens meters or even rice up to a hundred, answers extensively
For the Large-Scale Equipments manufacturing field such as spacecraft, aircraft, ship, wind-powered electricity generation, water power.The measurement range of domestic application is more than at present
The instrument of 50m has：Laser interferometer (>=60m), laser tracker (tracking range >=60m), pulse type laser rangefinder, light pen
Measuring instrument, hand-held laser rangefinder (100m), geodimeter, total powerstation etc., become Large-Scale Equipment, large-size components add
Work, detection, positioning indispensable tool.These instruments mostly use laser ranging principle, far measuring distance, high certainty of measurement,
This just proposes an urgent demand to the magnitude tracing ability of Large-scale Measuring Instruments.
By taking JJG 966-2010 hand-held laser rangefinder vertification regulations as an example, it is required that measurement range be 200m with
It is interior.Therefore, the detection of this kind of Large-scale Measuring Instruments generally requires to carry out in the larger context, but since space is limited, general
Logical lab space cannot be satisfied at all.Current existing measurement method mostly uses greatly the mode of indoor detection in hundred meters,
If the indoor 80m long lengths laser of china institute of metrology foundation is than long national standard device and 26m comparators；Air China's industry north
The 35m of capital Great Wall metrological testing technology Research Institute compares growth device；Zhejiang Province Measure Science ＆ Technology Research Institute, Tianjin metrological supervision
The 50m length standard devices etc. that detection research institute, Hebei province's quality surveillance detection institute develop respectively.
In addition to calibrating specification is for the limitation of measurement range, indoor large space detection mode there is also some problems：1. making
Valence is sufficiently expensive, builds difficulty height, and general testing agency is difficult to bear, by taking Zhejiang Province Measure Science ＆ Technology Research Institute as an example, interior 50
Rice length standard apparatus cost is up to 142.5 ten thousand yuan；2. taking up a large area, common laboratory condition is difficult to meet tens meters even
Up to a hundred meters of space requirement；3. detection efficiency is low, such as the requirement of JJG966-2010 hand-held laser rangefinder vertification regulations, and 50
The error of indication is detected in rice, at least needs to measure 12 points, a verification worker measures a laser range finder and needs the road walked
Close to 600 meters, testing staff's journey can't bear the heavy load.
There is the above it is found that mostly using field baseline field type more than the detection of hundred meters of ranges at present, baseline field belongs to
First class standard measurer in national strain line transmission of quantity value system.But summarize in practical verification process, field baseline field detecting exists
Problems：1. establishing for baseline field is extremely difficult, hundreds of are selected in city, and even above kms are straight and without natural obstacle, nothing
The area of people and animals' interference is very difficult.2. can find meet above-mentioned condition occasion must be far from city place, this gives
Calibration operation brings great inconvenience, and time-consuming and laborious takes the energy.3. field baseline field is layouted on the ground or on pile, instrument
And the erection of reflector and very painstaking to line, not only must more than two personnel's operations, and also tend to because to line it is inaccurate due to
It cannot get correctly reliable result.4. operation is influenced quite big by weather under the natural climate condition of field, since Changes in weather passes through
It is low to often result in calibrating efficiency, work quality can not also improve.
In conclusion for the detection of large scale, long distance laser ranging quasi-instrument, either indoor long length standard
That all there is costs device or field baseline field is high, takes up a large area, the problems such as detection efficiency is low, complicated for operation.If energy
Reduced space will be technically measured, or even common lab is moved into field baseline field, realizes long range ranging " outdoor detection
The breakthrough of indoorization ", will be with great researching value and application prospect.Since remote measuring instrument mostly uses laser
Measuring technique, this just be project propose by light path folding, the realization for completing optic path multiplexing creates possibility, by medium and long distance
The ranging of baseline field foreshorten to indoor completion, by the indoor long range measurements of large space foreshorten to the short distance in small space survey
Amount represents following development trend.
In recent years, many scientific research institutions have been carried out using the principle of light path folding for the inspection of laser ranging quasi-instrument both at home and abroad
The research work of survey has following several than more typical light path folding, the method for optic path multiplexing：
(1) 2011 year South China Science ＆ Engineering University's Chen Wei fine jade is fixed indoors using the plane mirror being mutually parallel, by swashing
Light beam multiple reflections between plane mirror examine and determine total powerstation come the method for simulating length standards, and the distance between plane mirror is by swashing
Optical interferometer is demarcated, and the depth of parallelism and distance calibration between plane mirror is to influence the principal element of accuracy in detection；2015
The Pan Jiasheng of Guangdong Institute of Metrology, yellow shortcake et al. pass through also with plane mirror that is fixed, being mutually parallel
The method of total powerstation and hand-held laser rangefinder matching measurement examines and determine hand-held laser rangefinder, and virtual baseline reaches 100m, expands
Open up uncertainty U=1.4mm, k=2 [20].There are the problem of：1. within the scope of long range, light path calibration technique difficulty is very
Greatly, while between the flatness and speculum of big plane mirror the depth of parallelism can all introduce larger uncertainty of measurement, measure
The stability of system is poor.Exist 2. the depth of parallelism between the accuracy of rangefinder incidence angle, plane mirror can all seriously affect laser beam
Accurate location within the scope of solid space causes light path adjustment and reflecting target capture target hot spot extremely difficult, and measurement is not easy
Implement.3. the measurement method of system still belongs to discrete type measurement, without the ability continuously measured on a large scale.
(2) 2013 years Xi'an University of Technology Li Qian et al. carry out in dynamic space light using corner cube mirror group more
Secondary folding shortens 50m measurement distances in more than ten meters of space, demarcates light path by total powerstation and is surveyed to detect Handheld laser
The measurement range of the error of indication of distance meter, system reaches 50 meters；Jiangsu Province's mapping product quality monitoring testing station proposes within 2016
Light path folding simulation length standards are carried out using right-angle prism and examine and determine total powerstation, and research rests on method imagination and technological difficulties
Assessment level, is not furtherd investigate.Application No. is 2013100161742, patent name is that " hand-held laser rangefinder is examined and determine
System and calibration method " there are the problem of：1. the reflection characteristic of corner cube mirror group and right-angle prism, although ensure that laser beam
Between keeping parallelism in the horizontal plane, but still there are problems that the guarantee of light beam collimation in vertical plane, especially supporting plate is dynamic
In state moving process, the position constraint of light beam is very difficult.2. realize that four times of light paths need three groups of right angle reflector parts in system,
Totally 6 speculums, structure are excessively complicated.In moving process, the position degree between verticality, microscope group between speculum can all be led
It causes to measure inaccuracy, influences the measurement stability of system.
(3) it proposes to establish using micro-prism array in the doctoral thesis of Institute of Geophosics of China Earthquake Administration Yang Wei virtues
The method of virtual Long baselines, it is indicated that with the baseline of 1km long is established on 25 prism of corner cubes indoors distance of 40m be feasible.
Equally exist complicated, light path calibration difficulty, bad measurement repeatability, it is not easy to operate, asked without continuous measurement capability etc.
Topic.But be worth using for reference is that reflection device ensure that laser beam in the flat of spatial dimension using the retro-reflective properties of prism of corner cube
Row so that light collimation constraint becomes simple and practicable.
(4) in addition Wuhan Le Tong Photoelectric Co., Ltd.s research in new high-tech institute is put into interior to replace field base using optical fiber
Line detects laser range finder, it is proposed that extraordinary technical solution.But it is found in investigation, light beam is in optical fiber in random anti-
Penetrate state, the length of each light path section is all random, and optical fiber arbitrarily turns back curvature and bending angle will all be introduced directly into mistake
Difference, does not have operability, and experiment is in exploration stage.
In conclusion the method for optic path multiplexing still lacks and is applicable to the high measurement side of accuracy that a line detects at present
Method, that there is light path calibration technique difficulty is big, system structure is complicated, measures the problems such as poor stability, operating difficulties, and laser beam exists
Position constraint in folding process be the key that improve accuracy of measurement, especially reflection device during dynamic mobile how
The adaptive ability for improving laser beam needs further to probe into.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of reasonable for structure, it is strong to measure stability,
It is easy to operation, laser beam measuring accuracy high a kind of laser range finder verification system and its calibrating based on error cancellation principle
Method.
The utility model is achieved through the following technical solutions：
Based on the laser range finder verification system of error cancellation principle, including a verification table, by a side of the verification table
Portion is set as fixing end, and a fixation adjusting apparatus is equipped in the fixing end, to be checked for fixing in the fixation adjusting apparatus
Laser range finder, after the fixed adjusting apparatus fixes laser range finder to be checked, the exit end of the laser range finder and inspection
It is parallel to determine platform extending direction, one is equipped in the verification table from walking target vehicle, should walk target vehicle certainly can be along verification table
It is moved back and forth in the horizontal direction, it is characterised in that：It is described that mobile reflection device is installed from walking target car, in the inspection
Determine platform fixing end and reflecting target and at least one fixation reflex device are installed positioned at the side of fixed adjusting apparatus, it is described from walking
The rear end that target car is located at mobile reflection device is equipped with a measurement speculum, in the end of the verification table far from fixing end
One laser interferometer, the laser beam for measuring speculum and being used for the transmitting of reflection laser interferometer, in laser interferometer are installed
A spectroscope is installed in light path between measurement speculum.
Moreover, each fixation reflex device receives the laser beam of mobile reflection device reflection, and laser beam is anti-again
Be incident upon fixation reflex device, the laser beam emitted by laser range finder, mobile reflection device and each fixation reflex device it
Between reflect after, finally reflex to reflecting target surface through mobile reflection device.
Moreover, the mobile reflection device and fixation reflex device are all made of prism of corner cube, plated in the bottom surface of prism of corner cube
Anti-reflection film plates Anti-reflective coating in three right-angle surfaces of prism.
Using the calibration method of the above-mentioned laser range finder verification system based on error cancellation principle：
Step 1：Laser range finder, fixation reflex device, reflecting target are mounted on fixing end, by mobile reflection device and survey
Reflection device in amount reference part is fixed in a manner of back-to-back from walking target vehicle, laser interferometer and spectroscope placement
In verification table end；
Step 2：The pose that laser range finder is corrected by laser range finder adjusting apparatus, makes laser range finder emergent ray
It is parallel with from the walking target vehicle direction of motion, while the position of each fixation reflex device and reflecting target is adjusted, form it into four
Times Cheng Guanglu；By adjusting the pose of verification table end laser interferometer, laser interferometer light beam is made to be transported with from walking target vehicle
Dynamic direction is parallel, and beam path alignment finishes.
Step 3：It is measured initial position since walking target vehicle, laser interferometer numeration is reset, while laser ranging
Instrument measures initial distance D0。
Step 4：The mobile target vehicle of walking certainly is locked when moving to position to be calibrated, the displacement data of recording laser interferometer
Li, while the measurement distance D of recording laser rangefinder at this timei。
Step 5：Laser range finder is in the error of indication of each calibrating position：δ=Di-D0-4Li。
The advantages of the utility model and good effect are：
1, in this verification system, verification table is equipped with reflecting target and at least one for placing laser range finder to be checked
A fixation reflex device, from walking, target vehicle is equipped with mobile reflection device as mobile terminal, moves reflection device and multiple solid
Reflection device is determined for folding light path, and double light path, and it is anti-to be equipped with measurement backwards to the target car of walking certainly of mobile reflection device
Mirror is penetrated, the variable quantity that speculum cooperation verification table rear end laser interferometer is used to detect mobile reflection device position is measured；
2, in this calibrating installation, mobile reflection device and fixation reflex device are all made of bottom surface and three right-angle surface plating increasings instead
The prism of corner cube of film is then the energy attenuation in order to solve the problems, such as laser beam in reflection device；
3, it in the utility model, is matched by a mobile reflection device and multiple fixation reflex devices, by multichannel light
The folding of beam concentrates in a reflection device completing, and traditional optic path multiplexing method, the corresponding light path of n reflection device is (n
+ 1) it is 2n times that again, and in novel times of Cheng Fangfa n reflection device, which corresponds to light path, therefore journey efficiency greatly improves again；In addition, adopting
System is surveyed caused by relative position variation when also avoiding dynamic mobile in conventional model with above structure between multiple devices
Stability problem is measured, mobile terminal only needs to control the bearing accuracy of mobile reflection device, so that it may accurately to realize light path folding,
Therefore the convenience of operation is improved；In addition to this, after laser beam enters reflection device, emergent ray keeps flat with incident ray
It goes and there is axial symmetry to go out incident laser rays with error when arbitrary orientation deflection angle occurs for mobile reflection device
Cancellation characteristic, light path summation is constant, further improves the facility of system operatio, ensure that the accuracy of systematic survey.
4, in the utility model, using the calibrating side of the above-mentioned laser range finder verification system based on error cancellation principle
Method is based on optic path multiplexing and error cancellation principle, and light is folded, and the interior virtual length for establishing multiplication is surveyed in a limited space
Amount system is examined and determine hence for laser range finder to be detected, provides one kind, simple in structure, easily controllable, is measured and is stablized
Property it is good, model itself has error cancellation characteristic, accuracy of measurement high a kind of verification system and its calibration method.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the schematic diagram of the multiple fixation reflex devices of the utility model；
Fig. 3 is the schematic diagram of error cancellation characteristic.
1. fixing adjusting apparatus, 2. laser range finders, 3. reflecting targets, 4. verification tables, 5. laser range finders, 6. movement reflections
Device, 7. spectroscopes, 8. laser interferometer, 9. measure speculum, 10. fixation reflex devices
Specific implementation mode
It elaborates to the utility model below by embodiment, the embodiment is illustrative instead of limiting
, protection scope of this utility model cannot be limited by this.
1, research method：
(1) light path calibration and error cancellation method
As shown in Fig. 2, under ideal pose, laser range finder emits laser beam at O1 and is incident to mobile reflection device A
Point, light beam by reflection from B point reflected in parallel to fixation reflex device O3 points, when measurement model is in non-ideal posture, light
The deflection of θ angles has occurred in the optical axis of line and reflection device, and light beam is caused to be incident to A ' points, the point from B ' point reflections to O2.If O1
Light path to A is a, and the light path of O1 to A ' is a ', and the light path of O2 to B ' is b ', and the light path of O3 to B is b, due to reflection device
Retro-reflective properties and axial symmetry, no matter how azimuth angle theta, which changes, has：A+b=a '+b ', measurement model itself, which has, to be missed
Poor cancellation characteristic need to only be calibrated through the light path at optical axis O, you can obtain the multiplication light path of high accuracy.
Above-mentioned error cancellation model is built upon in many hypothesis, as reflection device has complete axial symmetry, inverse
To the collimation etc. of reflection.From theoretical completeness or in engineering validity, such model basis is too simple and manages
Wanting.Therefore, we will further investigate on the basis of ideal model, to provide the universal model of measurement method, solve more
Universal problem.
(2) selection and design of reflection device
Reflection characteristic, reflectivity and the processing technology of existing optical reflective devices are analyzed, theory analysis simultaneously designs reflection
The technical parameter of device.Existing three classes reflection device：Prism of corner cube, plane mirror, right-angle prism, since prism of corner cube has
There is orienting reflex characteristic, and light path of the light in prism is a constant, project is quasi- to select prism of corner cube to establish indoor base
Line.
Light has two secondary reflections through the incidence of prism of corner cube bottom surface in bottom surface, reflects (except normal incidence) twice,
In the triple reflection of three right angle reflectings surface, if incidence angle is more than critical angle of incidence, it is totally reflected, reflection loss is
Zero；If the incidence angle to some reflecting surface is less than critical angle of incidence, part occurs in the face and reflects, luminous energy is caused to damage
It loses.The reflectivity of general material is calculated all between 85%-90% with the aluminium mirror that reflectivity is 85%, after 12 secondary reflections,
The energy that laser reflection is returned is only the 14.2% of primary power.
I=α12I0 (1)
In formula：I is reflected energy, and α is specular reflectivity, I0For primary power.
Current minute surface plates the technology that assembly of thin films has been highly developed, in order to reduce the reflection loss of optical device, project
Group is quasi- to plate anti-reflection film using in the bottom surface of prism of corner cube, and Anti-reflective coating is plated in three right-angle surfaces of prism, ensure be totally reflected it is endless
The function of total reflection is completed in the case of complete, energy loss when light passes through prism of corner cube only has the reflection loss twice of bottom surface
With the absorption loss water of glass, take prism of corner cube plate single layer anti reflective coating after bottom reflection coefficient be 0.005, optical glass it is transparent
FACTOR P is 0.99, then the transmitance of prism of corner cube is：
τ=0.995 × 0.99l (2)
In formula：L is optical axis length (unit：Cm), after prism of corner cube expansion, optical axis length l is：
In formula：R is the inscribed circle radius of prism of corner cube bottom surface, and h is that prism is high.A height of 50mm of prism of corner cube is taken to calculate,
The transmitance of prism of corner cube is：
τ=0.995 × 0.995=0.95 (4)
By subsequent experiment and Theoretical Proof, the filming parameter of prism of corner cube is designed, solves laser beam in reflection device
In energy attenuation problem.In addition, through market survey, the processing technology of prism of corner cube has realized that light beam parallelism tolerance is ± 1 "
Batch production, clear aperature up to 120mm even 200mm.Therefore, current plated film and processing technology all meet enough measures
Indices requirement of the model to reflection device.
(3) design of virtual length baseline system with build
As shown in Figure 1, detecting the displacement variable L of mobile terminal by laser interferometer, light path transfers system by rangefinder
Measurement distance extend to 4L, and then examine and determine the error of indication of rangefinder.The linear measurement precision of laser interferometer up to ±
0.5ppm, measurement distance meet requirement of the system to measurement accuracy and measurement range enough up to 80 meters.
The length L of virtual baseline is known to measuring system：
Wherein, n is the light path amplification factor of system, angles of the θ between standard light beam and tested light beam, LyIt is dry for laser
Interferometer indicating value.
(4) analysis of uncertainty in measurement of virtual length baseline.
By optic path multiplexing principle founding mathematical models, analysis partial uncertainty source is studied different by mathematical analysis
Interference effect in the error chain of Additive Model, obtains prioritization scheme.
It is public according to uncertainty combinationFormula is obtained by formula (5)：
Wherein：It can obtain：
The straightness for 50 meters of length detection platforms that project is relied on is 5 × 10-5, after beam path alignment, existed with laser beam at 200 meters
Maximum offset 40mm is calculated on reflecting target, and θ is 0.0002 radian, therefore Section 2 is very small in formula (7), can ignore not
Meter；N is the light path multiple of measuring system, and indoors under laboratory environment, temperature humidity is stablized relatively, and air refraction is not
Degree of certainty can almost be ignored, and Section 3 is zero in formula (7)：
Calculate standard uncertainty component：
1. the partial uncertainty u that position error introduces at 50 meters of laser interferometerjg：α is confidence interval half width, k
For the Coverage factor of confidence level,
Wherein：The linear measurement error of laser interferometer is ± 0.5ppm, and obedience is uniformly distributed.
2. the partial uncertainty u that Abbe error introducesab：α be confidence interval half width, k be confidence level comprising because
Son,
The factor for influencing measuring system Abbe error, which includes verification table straightness, front-wheel or trailing wheel coaxiality error, to be caused certainly
Walking the rocking of target vehicle, front wheels and rear wheels difference in height lead to the rolling from pitch error, four-wheel walking after target Chinese herbaceous peony of walking
Turn error etc..Assuming that Abbe arm L is 100mm, estimates that angular error caused by composite factor is 0.001 radian, obey uniform point
Cloth, then：
3. the partial uncertainty u that cosine error introducesyx：α be confidence interval half width, k be confidence level comprising because
Son,
Assuming that when the offset at system design permission 50m is 20mm, by the extension of four times of light paths, reflected at 200 meters
Offset on target is 80mm, the cosine error e at 200myxObedience is uniformly distributed, and the partial uncertainty of introducing is：
Therefore, the offset distance of light should control in a certain range, and table 1 is that cosine caused by different offsets misses
Difference.
1 cosine error of table
| Offset (at 50 meters) | Offset (at 200 meters) | Cosine error (mm) |
| 10mm | 40mm | 0.004 |
| 20mm | 80mm | 0.016 |
| 40mm | 160mm | 0.064 |
4. the bottom surface of laser beam light out of plumb prism of corner cube leads to the partial uncertainty u of the unstable introducing of rangingcj：α is
Confidence interval half width, k are the Coverage factor of confidence level,
Wherein：Ranging stability influence error maximum estimated is 0.07mm, and obedience is uniformly distributed.Put aside other influences
Uncertainty of measurement factor, the Composite Seismogram u (L) of 200 meters of virtual length baselines：
Due to there are many complicated factors in practice, the expanded uncertainty of measurement expection of 200 meters of virtual length baselines reaches
To U≤1.0mm, k=2.
2, feasibility analysis
Experiment 1：Optic path multiplexing experiment based on corner cube mirror group
Rangefinder is placed on the headstock of gauging machine, and speculum group is placed on moveable tailstock, and deviation mirror is as quilt
It surveys target to be placed on headstock, all measurement devices are all fixed by plasticine.Measurement starts, and adjusts light path first, passes through survey
Leader tailstock moves back and forth back and forth, adjusts the position and attitude of rangefinder, ensures that shoot laser beam is parallel with guide rail, returns to target
The deviation distance of the laser beam of plate is no more than 10mm.After light path adjusts, the machine zero-bit of gauging machine, rotary micromotion hand are adjusted
100 millimeters of grooves are aligned by wheel with the double grooves of decimetre section zero-bit, and stadia surveying, record start data, mobile tailstock is extremely
At 900mm, 900 millimeters of double grooves of 100 millimeters of grooves and decimetre section are aligned by adjustment fine motion handwheel, and rangefinder measures again, note
Record data.Each rangefinder takes survey measurements three times, measures different initial positions five times, measurement result is as shown in the table.
2 measurement data (unit of table：mm)
During measurement experiment, rangefinder is working properly, and range performance is stablized, and is not influenced by light path folding.From
Measurement data can be seen that five different locations in table 2, amounts to 15 times and measures comparison, the reading difference of rangefinder is
1800mm, the distance that light path measures increase one times.The experimental results showed that：Laser range finder is suitable for the light based on speculum group
Journey multiplication method is laid a good foundation for the follow-up research for carrying out optic path multiplexing measurement method.
Experiment 2：Optic path multiplexing experiment based on prism of corner cube
Seminar has built one using prism of corner cube, Leica hand-held laser rangefinders, three coordinate measuring machine and has been based on angle
Whether 2 times of Cheng Guanglu measuring systems of cone prism, verification laser range finder are suitable for the optic path multiplexing method based on prism of corner cube.
Coordinate measuring machine is the high-precision measuring type instrument of Leitz model PMM XI 12.10.7, and X-direction stroke is up to 1200mm.
Rangefinder and reflecting target are fixed on adjustment workbench, and prism of corner cube is fixed on the moveable work of three coordinate measuring machine
Make on platform, first by adjusting workbench collimated laser beam, ensures that shoot laser is parallel with coordinate measuring machine guide rail, return to mesh
The deviation distance of the laser beam of target is no more than 10mm.After light path adjusts, the initial reading of Hand-hold Distance Finder is recorded
Value is 1.153m, then controls coordinate measuring machine by proximad remote mobile working platform, often moves 100mm records and hold laser ranging
The reading value of instrument amounts to ten measurements.Measurement result is as shown in the table：
3 measurement data (unit of table：mm)
In experimentation, rangefinder is working properly, and range performance is stablized, and the shadow of light path is not folded by prism of corner cube
It rings.It is coordinate measuring machine displacement that the data of ten measurements, which can be seen that the measurement distance of hand-held laser rangefinder, from table 3
Twice, light path measure distance increase one times.The experimental results showed that：Laser range finder is suitable for the light based on prism of corner cube
Journey multiplication method.
Laser range finder verification system based on error cancellation principle：
Based on the laser range finder verification system of error cancellation principle, including a verification table 4, by a side of the verification table
Portion is set as fixing end, and a fixation adjusting apparatus 1 is equipped in the fixing end, to be checked for fixing in the fixation adjusting apparatus
Laser range finder 2, after the fixed adjusting apparatus fixes laser range finder to be checked, the exit end of the laser range finder and inspection
It is parallel to determine platform extending direction, one is equipped in the verification table from walking target vehicle, should walk target vehicle certainly can be along verification table
It is moved back and forth in the horizontal direction, the innovation of the utility model is, described to be equipped with mobile reflector from walking target vehicle 5
Part 6, the side that fixed adjusting apparatus is located in the verification table fixing end are equipped with reflecting target 3 and at least one fixed reflector
Part 10, the rear end that mobile reflection device is located at from walking target car is equipped with a measurement speculum 9, far from fixed
The end of the verification table at end is equipped with a laser interferometer 8, described to measure speculum swashing for the transmitting of reflection laser interferometer
Light beam, laser interferometer and measure speculum between light path in a spectroscope 7 is installed.
In the present embodiment, each fixation reflex device receives the laser beam of mobile reflection device reflection, and by laser beam
Fixation reflex device is reflexed to again, the laser beam emitted by laser range finder, in mobile reflection device and each fixation reflex
After being reflected between device, finally reflecting target surface is reflexed to through mobile reflection device.
In the present embodiment, the mobile reflection device and fixation reflex device are all made of prism of corner cube, in prism of corner cube
Anti-reflection film is plated in bottom surface, and Anti-reflective coating is plated in three right-angle surfaces of prism.
Using the calibration method of the laser range finder verification system based on error cancellation principle, innovation is：
Step 1：Laser range finder, fixation reflex device, reflecting target are mounted on fixing end, by mobile reflection device and survey
Reflection device in amount reference part is fixed in a manner of back-to-back from walking target vehicle, laser interferometer and spectroscope placement
In verification table end；
Step 2：The pose that laser range finder is corrected by laser range finder adjusting apparatus, makes laser range finder emergent ray
It is parallel with from the walking target vehicle direction of motion, while the position of each fixation reflex device and reflecting target is adjusted, form it into four
Times Cheng Guanglu；By adjusting the pose of verification table end laser interferometer, laser interferometer light beam is made to be transported with from walking target vehicle
Dynamic direction is parallel, and beam path alignment finishes.
Step 3：It is measured initial position since walking target vehicle, laser interferometer numeration is reset, while laser ranging
Instrument measures initial distance D0。
Step 4：The mobile target vehicle of walking certainly is locked when moving to position to be calibrated, the displacement data of recording laser interferometer
Li, while the measurement distance D of recording laser rangefinder at this timei。
Step 5：Laser range finder is in the error of indication of each calibrating position：δ=Di-D0-4Li。
In the utility model, matched by a mobile reflection device and multiple fixation reflex devices, by multichannel light beam
Folding concentrate in a reflection device completing, traditional optic path multiplexing method, the corresponding light path of n reflection device is (n+
1) it is 2n times that again, and in novel times of Cheng Fangfa n reflection device, which corresponds to light path, therefore journey efficiency greatly improves again；In addition, using
Above structure also avoids systematic survey caused by relative position variation when dynamic mobile in conventional model between multiple devices
Stability problem, mobile terminal only need to control the bearing accuracy of mobile reflection device, so that it may accurately to realize light path folding, because
This improves the convenience of operation；In addition to this, after laser beam enters reflection device, emergent ray and incident ray keeping parallelism
And there is axial symmetry, when arbitrary orientation deflection angle occurs for mobile reflection device, going out incident laser rays has error phase
Disappear characteristic, and light path summation is constant, further improves the facility of system operatio, ensure that the accuracy of systematic survey.
The calibration method of the laser range finder verification system based on error cancellation principle is based on optic path multiplexing and error
Cancellation principle folds light, in a limited space the interior virtual length measuring system for establishing multiplication, hence for be detected
Laser range finder examined and determine, one kind is provided, it is simple in structure, it is easily controllable, measure stability it is good, model itself have error
Cancellation characteristic, accuracy of measurement high a kind of verification system and its calibration method.
Claims (3)
1. based on the laser range finder verification system of error cancellation principle, including a verification table, by a side end of the verification table
It is set as fixing end, a fixation adjusting apparatus is installed in the fixing end, it is to be checked for fixing in the fixation adjusting apparatus
Laser range finder, after the fixed adjusting apparatus fixes laser range finder to be checked, the exit end of the laser range finder and calibrating
Platform extending direction is parallel, and one is equipped in the verification table from walking target vehicle, should can be existed from walking target vehicle along verification table
It is moved back and forth in horizontal direction, it is characterised in that：It is described that mobile reflection device is installed from walking target car, in the calibrating
The side that platform fixing end is located at fixed adjusting apparatus is equipped with reflecting target and at least one fixation reflex device, described from walking target
The interior rear end for being located at mobile reflection device of mark is equipped with a measurement speculum, pacifies in the end of the verification table far from fixing end
Equipped with a laser interferometer, the laser beam for measuring speculum and being used for the transmitting of reflection laser interferometer, in laser interferometer and
It measures in the light path between speculum and a spectroscope is installed.
2. the laser range finder verification system according to claim 1 based on error cancellation principle, it is characterised in that：Each
Fixation reflex device receives the laser beam of mobile reflection device reflection, and laser beam is reflexed to fixation reflex device again,
The laser beam emitted by laser range finder, after being reflected between mobile reflection device and each fixation reflex device, finally
Reflecting target surface is reflexed to through mobile reflection device.
3. the laser range finder verification system according to claim 1 based on error cancellation principle, it is characterised in that：It is described
Mobile reflection device and fixation reflex device are all made of prism of corner cube, anti-reflection film are plated in the bottom surface of prism of corner cube, the three of prism
A right-angle surface plates Anti-reflective coating.
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| CN201721781642.5U CN207675937U (en) | 2017-12-19 | 2017-12-19 | Laser range finder verification system based on error cancellation principle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287338A (en) * | 2017-12-19 | 2018-07-17 | 天津市计量监督检测科学研究院 | Laser range finder verification system based on error cancellation principle and its calibration method |
| CN112066961A (en) * | 2020-09-15 | 2020-12-11 | 成都明杰科技有限公司 | Abbe error control system for precision measurement |
| CN112525082A (en) * | 2020-11-26 | 2021-03-19 | 合肥工业大学 | Device and method for simultaneously detecting positioning accuracy and straightness of linear displacement table |
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2017
- 2017-12-19 CN CN201721781642.5U patent/CN207675937U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287338A (en) * | 2017-12-19 | 2018-07-17 | 天津市计量监督检测科学研究院 | Laser range finder verification system based on error cancellation principle and its calibration method |
| CN112066961A (en) * | 2020-09-15 | 2020-12-11 | 成都明杰科技有限公司 | Abbe error control system for precision measurement |
| CN112525082A (en) * | 2020-11-26 | 2021-03-19 | 合肥工业大学 | Device and method for simultaneously detecting positioning accuracy and straightness of linear displacement table |
| CN112525082B (en) * | 2020-11-26 | 2022-04-29 | 合肥工业大学 | Device and method for simultaneously detecting positioning accuracy and straightness of linear displacement table |
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