CN207946107U - A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder - Google Patents
A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder Download PDFInfo
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- CN207946107U CN207946107U CN201721909810.4U CN201721909810U CN207946107U CN 207946107 U CN207946107 U CN 207946107U CN 201721909810 U CN201721909810 U CN 201721909810U CN 207946107 U CN207946107 U CN 207946107U
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- laser rangefinder
- held laser
- verification table
- bottom plate
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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 hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder, including a fixed station, the fixed station one end is equipped with clamping device, the clamping device is used to be fixed with one end of verification table, one manual angular displacement platform is installed in the fixed station, a manual turntable is installed with above the manual angle moving stage, a fixed seat is installed above the manual rotation platform, for placing hand-held laser rangefinder to be checked in the fixed seat, in the case where placing hand-held laser rangefinder state, the laser emitting direction of the hand-held laser rangefinder and the extending direction of verification table extend in parallel；The fixed seat includes a bottom plate, and the smooth setting in bottom plate upper surface, the bottom plate, which is located at close verification table side, and verification table side is vertically-mounted respectively backwards a datum plate.
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 hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder.
Background technology
In the metering of length geometric sense, detection process, in the prevalence of information source correctness problem.Measurement standard
Undesirable relative measurement position between element to be measured is one of the typical case for influencing information source correctness, in systems
Extra error is introduced, the accuracy of verification result is influenced.
With overall length 50.423m, width is upper surface for the marble verification table of 124.23mm, unilateral side surface
For standard working face, theoretical precision is when marble verification table dispatches from the factory：Top surface plane degree, straightness up to 0.015mm, on
With standard side surface verticality up to 0.02mm, standard side surface straightness is 0.015mm, is put down between the side surface of both sides on surface
Row degree is 0.1mm.
Therefore, marble verification table working face condition under theoretical precise manner will not introduce mistake in verification process substantially
Difference.But in actual use, the precision of verification table working face inevitably vibrated by from external environment,
The disturbing factor that temperature and verification process introduce influences, it is therefore desirable to verification table upper surface straight line after a period of use
Degree periodically measures, and measures vertical direction and horizontal direction straightness at 15m, 25m, 40m, the positions 50m respectively, measures knot
Fruit is as shown in table 1.
Table 1
Analysis can obtain, and upper surface working face vertical direction straightness is 3.8mm, and horizontal direction straightness is 1.7mm.Survey
The emergent ray of rangefinder is possible to be detached from reflecting plate in vehicle walking process, if measuring car adjusts rangefinder in distal end at this time
The process that pose completes target-seeking will be very difficult.
In order to improve detection quality, promote verification system anti-interference ability, streamline operation, this project team is for hand-held
One device for having multiple degrees of freedom adjustment ability of verification process development and design of laser range finder.The device meet it is forward and backward
While benchmark fixes rangefinder, the angular adjustment ability with high-fineness.
In current market both domestic and external, there are no the special devices positioned for hand-held laser rangefinder with adjustment
Occur.Therefore, the blank of domestic standard measurement equipment is either filled up, or promotes the accuracy of the verification result of rangefinder,
Multiple degrees of freedom positioning adjustment holder is developed to have great importance.
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, easy to operate, promotion
Detect quality, a kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder of strong antijamming capability.
The utility model is achieved through the following technical solutions：
A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder, it is characterised in that：Including a fixed station, institute
It states fixed station one end and clamping device is installed, which is used to be fixed with one end of verification table, in the fixed station
One manual angular displacement platform is installed, a manual turntable, the manual rotation are installed with above the manual angle moving stage
One fixed seat is installed above platform, for placing hand-held laser rangefinder to be checked in the fixed seat, is placing hand-held
Under laser range finder state, the laser emitting direction of the hand-held laser rangefinder is parallel with the extending direction of verification table to prolong
It stretches.
Moreover, the fixed seat includes a bottom plate, the smooth setting in bottom plate upper surface, where plane and verification table it is upper
Plane where end face is mutually parallel, and the bottom plate, which is located at close verification table side, and verification table side is vertically-mounted respectively backwards has
One datum plate makes a through-hole in the middle part of the datum plate of verification table side, for hand-held laser rangefinder in the through-hole
Laser emitting is equipped with a pressing device positioned at the side of bottom plate, which is used for the pressure of hand-held laser rangefinder
It fastens in bottom plate upper surface.
Moreover, the pressing device includes elevating lever, multiple elevating lever vertical spacings are mounted on bottom plate side, the lifting
It is set with buck piece outside bar.
Around the hand-held laser rangefinder demand that pose adjusts in verification process, how free this seminar development and design is
The accurate adjustment holder of degree.It takes and represents line direction along verification table as x-axis direction, vertical verification table represents line direction as y in horizontal plane
Axis direction, plumb line direction are z-axis, the accurate rotation which can be along the accurate displacement of x, y, z axis direction and around y, z-axis direction
Modulation is whole, can provide the exact position in solid space, ensures laser range finder emergent ray in entire verification process to the greatest extent
Reflecting plate center position may be incident upon.
The advantages of the utility model and good effect are：
1, in this holder, fixed station carries out installation fixation by a side end of clamping device and verification table, the fixed station
Interior carrying is equipped with manual angle moving stage and manual rotation platform, mounting-fixing base above manual rotation platform, manual angle moving stage and
Manual rotation platform matches, and can be used for adjusting the position of fixed seat, forms the regulative mode of x, y, z axis Three Degree Of Freedom, has height
The angular adjustment ability of fineness；
2, in this holder, manual angle moving stage is closed for adjusting pitch angle, manual rotation platform for adjusting rotation angle, structure
Reason, it is easy to operation；
3, in this holder, the spacing of the datum plate of bottom plate both sides installation is matched with hand-held laser rangefinder to be checked,
Meet the requirement that forward and backward benchmark fixes hand-held laser rangefinder；Pressing device coordinates lifting tabletting to be used for by elevating lever will
The hand-hold ranger for being positioned over bottom plate upper surface fixes, and ensures that it is synchronous with fixed seat, is adjusted with angle；
4, in the utility model, fixed station, manual angle moving stage, manual rotation platform and fixed seat cooperatively form more than one freely
Degree adjustment holder, is used to carry hand-held laser rangefinder to be detected, and manual angle moving stage and manual rotation platform match,
The pitch angle and rotation angle of adjustable fixed station, fixed seat coordinate pressing device to carry out hand-held laser rangefinder to be detected
It is fixed, ensure fixed seat same angle displacement synchronous with hand-held laser rangefinder, is then by adjusting the position of fixed seat
The adjustment to hand-held laser rangefinder emergent light can be achieved, and then reduction even is eliminated verification table working face in verification process and shakes
Other disturbing factors that dynamic, temperature and verification process introduce influence.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is that pitch angle adjusts comparison diagram；
Fig. 3 is Abbe error analysis principle figure；
Fig. 4 is cosine error analysis principle figure.
1. elevating lever, 2. lifting tablettings, 3. bottom plates, 4. datum plates, 5. clamping devices, 6. verification tables, 7. fixed stations, 8. hands
Dynamic angular displacement platform, 9. manual rotation platforms, 10. grooves
Specific implementation mode
A kind of error analysis of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder
1, multiple degrees of freedom adjustment analysis on Necessity：
As shown in Fig. 2, facula position is along the z-axis direction in moving process on adjusting reflecting plate, hand-held laser rangefinder
When the use of translation and pitching two ways adjustment spot displacement amount being respectively h, practical optical path length is respectively L and L at this time ', and
When angular displacement is θ, pitch regulation mode introduces optical path difference e and is
θ=arctanh/L (3-2)
The optical path difference that pitching adjustment introduces is verified, the hot spot displacement distance h institutes in L=1m, 1.5m, 2m, 20m are calculated separately
The pitching angle theta size adjusted is needed, obtains pitching angle theta and theoretical optical path difference e, actual measurement optical path difference e ' is as shown in table 2 and table 3.
2 pitching angle theta size of table
3 theory optical path difference e of table and practical optical path difference e ' (unit mm)
Data are analyzed it is found that hot spot adjustment amount h when within 15mm, can be realized with minute angle pitch regulation rangefinder
Facula position adjusts on reflecting plate, finds that hot spot amount of movement is held in 5mm to measuring car when stroke movement in 20m in experimentation
Within, therefore rangefinder pose is not adjusted in preceding 20m strokes in practical verification process and also can guarantee that light does not depart from
Reflecting plate.The practical optical path difference that pitching adjustment introduces at 20m is basically stable at 0.1mm, it is known that selected rangefinder indicating value weight
Renaturation is 0.1mm, therefore the optical path difference that pitch angle introduces influences to can be ignored not caused by rangefinder error of indication verification result
Meter.
2, fixed mechanism designs
Known adjusted around y-axis direction pitching degree of angular freedom is realized dependent on manual angle moving stage, is surveyed in conjunction with Handheld laser
The respective calibrating requirement of preceding datum plate and rear datum plate, designs mating fixed mechanism in distance meter verification process, completes holder design.
It is similar to circular arc in conjunction with manual angle moving stage angle regulating principle to rotate around the center of circle, needs to adjust pose known to analysis
Hand-held laser rangefinder be fixed on angular displacement platform rotation circular arc center location at when adjustment process to rangefinder posture change
Minimum, if rangefinder length is M, adjusts the angle as θ, then beam projecting point position change when rangefinder center is in the center of circle
Moving △ h sizes isWhen the preceding benchmark of rangefinder or rear benchmark are located at center location, same angle, θ, Δ are adjusted
H' sizes are Δ h '=M × tan θ, i.e., rangefinder pose changes bigger when being adjusted the angle under latter instance.It therefore will be before rangefinder
Benchmark or rear origin reference location can more effectively change pose at center location when more low-angle adjusts.
It to sum up analyzes, the laggard line position appearance adjustment of design fixed structure clamping rangefinder keeps the preceding benchmark of rangefinder or rear base
Level is set in circle centre position, considers datum plate verification process feature before and after rangefinder.Forward and backward datum plate is all made of finished metal block
It limits, elevating lever does pressure tongue location survey distance meter with two panels lifting tabletting and gripped, and flexible to operation, rangefinder is arbitrary
Lifting tabletting can be completed fixed also ensure and can be applicable in the verification process of the rangefinder of different shapes under position.
3, system error analysis
After precisely adjusting positioning to hand-held laser rangefinder using multiple degrees of freedom holder, rangefinder indicating value outcome measurement
Error mostlys come from the reflecting plate carried on rangefinder itself and measuring car.In conjunction with system structure feature respectively to existing in system
Abbe error, cosine error and systematic error are analyzed.
(1) Abbe error
The content of Abbe's principle is：In the measurement process towards Length Quantity, normal line should be located with by the extended line of survey line
In same straight line.Straight line and tested length place straight line are at series relationship i.e. where the standard volume of measurer or instrument, if occurring two
Person is at being arranged in parallel, then the design principle and application method of the length measurer violate Abbe's principle, thus Abbe error generates,
As shown in Figure 3.Abbe error is not precisely due to the axis of measured piece axis and measuring instrument is coaxial and generate.When measuring system
Measuring axis, there are angle errors, and when tested instrument axis can not be with measured piece axis together, Abbe error will be introduced.
According to the size of angular deviation, keep the value measured bigger than normal or less than normal relative to actual value.Abbe error calculating process is such as public
Shown in formula 3-3.
Abbe error=offset × offset tangent of an angle=A0×tanθ (3-3)
In the verification process of rangefinder, measured laser beam is completely superposed with steel tape as ideal situation, Abbe at this time
Error is zero.In fact, laser beam and standard steel tape are misaligned, laser beam and the reflecting target error of perpendicularity, verification table table top
Lead to the rolling that the front and back pitch error, the four-wheel that detect vehicle are walked with the reflecting target error of perpendicularity, front wheels and rear wheels difference in height
Error can all introduce Abbe error, when there is pitch deviation in reflecting target, with verification table table top it is not exclusively vertical when, laser beam and steel
The difference in height L of tape measure is Abbe arm, Abbe error Δ L=L × tan θ at this time.And reflecting plate occur about the z axis deviations when
There is no Abbe arm, therefore system does not introduce Abbe error.Abbe error magnitude is the single order item of angle, θ, in measurement process not
It is negligible, it is therefore desirable to correct the Abbe error introduced in practical measurement process.
In order to shorten Abbe arm as far as possible, reduce Abbe error, project team reduces reflecting plate when designing measuring car mechanism
Highly, reflecting plate is designed into the front end face in measuring car, makes rangefinder outgoing beam as far as possible close to steel tape, Abbe arm lengths control
System is within 50mm.It designs mechanical structure simultaneously reflecting plate is fixed, ensure that reflecting plate pose in measuring car traveling process
It is basic to keep vertical with verification table table top.Measuring car is designed as three-wheel walking structure, and driving wheel is driven by stepper motor, driven polling
With standard rolling bearing, the roll error of four-wheel walking is avoided.Walking process is set more to stablize by increasing measuring car counterweight, from hardware
Abbe error is controlled in structure design.
(2) cosine error
Due to measuring misalignment between axis and axis to be checked in measurement process, cause between measured distance indicating value and true value
There are error, the magnitude size of this error is often proportional with the cosine of two axis angles, because of referred to herein as cosine error.
In this system, when rangefinder outgoing beam in measuring car total travel always can bornb sight center and it is parallel with table top when, it is remaining
String error not will produce, and will not be had an impact to measurement result.Therefore the introducing of cosine error can only generate measurement accuracy
It influences, on the repeatability of measurement without influence.As shown in figure 4, angle θ is the angle measured between kinematic axis and engineer's scale axis, measure
The length L and long L of rulerSBetween relationship be
L=LS×tanθ (3-4)
Different from Abbe error, cosine error is variate error, its existence function relationship, error between measurement length are big
Small e '=(1-cos θ) × L.In the present system, rangefinder laser beam axis and standard steel tape are there are when angle, cosine error
It is introduced into and causes between measurement result and actual distance that there are deviations.Assuming that the folder between laser beam axis and standard steel tape
Angle is θ, and measurand is X along direction of motion displacement distance, then rangefinder indicating value is：X '=X/cos θ, indicating value and actual displacement
Difference Δ X=X '-X=X × (1/cos θ -1), in practical measurement process, angle theta is minute angle amount, i.e. θ → 0 can be acquired
Error：
Cosine error is the second order term of angle theta, under normal circumstances θ very littles, and error is negligible.But in special applications field
It closes, cosine error size need to be introduced according to formula 3-5 analyses and compensates, improve measurement accuracy.
(3) environmental error
The equally possible introducing measurement error of environmental factor in hand-held laser rangefinder verification process.The material that temperature causes
Thermally expand main one of the environmental factor for influencing measurement process.Since the size of material or machinery equipment and ambient temperature are deposited
In functional relation, it is therefore desirable to equipment under test and holder, the expansion at different temperatures of the system structures such as reflecting plate and receipts
Contracting is modified.If material temperature T, material temperature penalty coefficient K=1- α when known materials thermalexpansioncoefficientα and measurement
(T-20), and after compensation scantling is
L1=L2×K (3-6)
Wherein L1 is length value under normal temperature (20 DEG C), and L2 is length value under temperature T.Marble verification table in this system
It is set up in about 20 DEG C of isoperibols, it is negligible that environment temperature introduces measurement error.
(4) holder measurement reproducibility is tested
Design repeatability of repeated experiment verification multiple degrees of freedom cradle head device during rangefinder pose adjusts.Experiment
Process is that measuring car is fixed in multiple positions on verification table, and adjusting laser range finder later makes emergent ray be incident upon in reflecting plate
At heart position, indicating value is recorded, adjustment emergent light leaves reflecting plate center, and duplicate measurements process at current measurement point until obtain again
Indicating value T is measured to eight dynamicsi, then arrive next measurement point and repeat the above process, compare TiIt measures and ties with static continuous five times
Fruit Si, as shown in table 4.
4 holder of table adjusts repeated experiment data
By data in analytical table it is found that aiming at static continuous five gatherer processes of reflecting plate center position in rangefinder
In, repeatability is characterized by standard deviation, indicating value repeatability is maintained within 0.07mm.
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.
A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder, the innovation of the utility model be, including
One fixed station 6, described fixed station one end are equipped with clamping device 5, which is used to be fixed with one end of verification table,
One manual angular displacement platform 8 is installed in the fixed station 7, a manual turntable is installed with above the manual angle moving stage
9, a fixed seat is installed above the manual rotation platform, for placing Handheld laser ranging to be checked in the fixed seat
Instrument, in the case where placing hand-held laser rangefinder state, the laser emitting direction of the hand-held laser rangefinder and verification table
Extending direction extends in parallel.
In the present embodiment, the fixed seat includes a bottom plate 3, the smooth setting in bottom plate upper surface, place plane and inspection
Plane where determining the upper surface of platform is mutually parallel, and the bottom plate is located at close to verification table side and is erected respectively backwards to verification table side
Straight to be equipped with a datum plate 4, the bottom plate and datum plate form a groove 10.Benchmark of the datum plate close to verification table side
A through-hole is made in the middle part of plate, the laser emitting of hand-held laser rangefinder is used in the through-hole, the side positioned at bottom plate is equipped with
One pressing device, the pressing device are used for being pressed abd fixed on hand-held laser rangefinder in bottom plate upper surface.
In the present embodiment, the pressing device includes elevating lever 1, and multiple elevating lever vertical spacings are mounted on bottom plate side,
It is set with buck piece 2 outside the elevating lever.
The use process of the utility model is：
When the utility model is used, it sets experimental situation in 20 degrees Celsius of isoperibol, adjustment holder is passed through
Clamping device is fixed on verification table side, and the measuring car carried in cooperation verification table is used, and the measuring car is tricycle structure, main
Driving wheel is driven by stepper motor, driven wheel selection standard bearing, can be walked along verification table table top, the upper end installation of the measuring car
There is reflecting plate, which is used to reflect the laser beam of hand-held laser rangefinder outgoing to be checked, in use, operation
Personnel adjust the pitch angle of laser beam by manual angle moving stage, in addition, the rotation of laser beam can be adjusted by manual rotation platform
Angle so that hand-hold ranger projects the dot projection of laser beam in the calibrating position of reflecting plate.
In the utility model, fixed station, manual angle moving stage, manual rotation platform and fixed seat cooperatively form a multiple degrees of freedom
Holder is adjusted, is used to carry hand-held laser rangefinder to be detected, manual angle moving stage and manual rotation platform match, can
The pitch angle and rotation angle of fixed station are adjusted, fixed seat cooperation pressing device is consolidated hand-held laser rangefinder to be detected
It is fixed, ensure fixed seat same angle displacement synchronous with hand-held laser rangefinder, then by adjusting the position of fixed seat
Realize the adjustment to hand-held laser rangefinder emergent light, and then reduction even is eliminated verification table working face in verification process and shakes
Other disturbing factors that dynamic, temperature and verification process introduce influence.
Claims (3)
1. a kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder, it is characterised in that：It is described including a fixed station
Fixed station one end is equipped with clamping device, which is used to be fixed with one end of verification table, peace in the fixed station
Equipped with a manual angular displacement platform, a manual turntable, the manual rotation platform are installed with above the manual angle moving stage
Top one fixed seat is installed, for placing hand-held laser rangefinder to be checked in the fixed seat, swash placing hand-held
Under optar state, the laser emitting direction of the hand-held laser rangefinder and the extending direction of verification table extend in parallel.
2. a kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder according to claim 1, feature exist
In：The fixed seat includes a bottom plate, the smooth setting in bottom plate upper surface, where plane and verification table upper surface where it is flat
Face is mutually parallel, and the bottom plate, which is located at close verification table side, and verification table side is vertically-mounted respectively backwards a datum plate,
A through-hole is made in the middle part of the datum plate of verification table side, the laser emitting of hand-held laser rangefinder is used in the through-hole,
One pressing device is installed positioned at the side of bottom plate, which is used to hand-held laser rangefinder being pressed abd fixed on bottom
In plate upper surface.
3. a kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder according to claim 2, feature exist
In：The pressing device includes elevating lever, and multiple elevating lever vertical spacings are mounted on bottom plate side, are set with outside the elevating lever
Lift tabletting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721909810.4U CN207946107U (en) | 2017-12-30 | 2017-12-30 | A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721909810.4U CN207946107U (en) | 2017-12-30 | 2017-12-30 | A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder |
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| CN207946107U true CN207946107U (en) | 2018-10-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051016A (en) * | 2017-12-30 | 2018-05-18 | 天津市计量监督检测科学研究院 | A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder |
| CN112370069A (en) * | 2020-11-13 | 2021-02-19 | 中国科学院苏州生物医学工程技术研究所 | Optical-based precise adjustment device and method for flat-plate cone-beam CT imaging component |
-
2017
- 2017-12-30 CN CN201721909810.4U patent/CN207946107U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051016A (en) * | 2017-12-30 | 2018-05-18 | 天津市计量监督检测科学研究院 | A kind of hand-held laser rangefinder calibrating multiple degrees of freedom adjustment holder |
| CN112370069A (en) * | 2020-11-13 | 2021-02-19 | 中国科学院苏州生物医学工程技术研究所 | Optical-based precise adjustment device and method for flat-plate cone-beam CT imaging component |
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