CN112729225B - Indoor virtual baseline calibration device and calibration method thereof - Google Patents
Indoor virtual baseline calibration device and calibration method thereof Download PDFInfo
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- CN112729225B CN112729225B CN202011490583.2A CN202011490583A CN112729225B CN 112729225 B CN112729225 B CN 112729225B CN 202011490583 A CN202011490583 A CN 202011490583A CN 112729225 B CN112729225 B CN 112729225B
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
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- G—PHYSICS
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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- G01C15/002—Active optical surveying means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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Abstract
The invention belongs to the technical field of calibrating devices for geometric measuring devices, and relates to calibrating equipment for a laser range finder, in particular to a calibrating device for an indoor virtual baseline and a calibrating method thereof. Including the examination platform of a length to setting up, install the guide rail in the examination platform, the one end of this guide rail sets up to the fixed part, and slide rail middle part slidable mounting has the removal portion, install the adjustment platform side by side and reflect the target along the width direction of examination platform in the fixed part, wherein the laser range finder that the mobile installation was waited to examine in the adjustment platform, a total powerstation is installed to laser range finder laser outgoing position one side dorsad the light path of total powerstation and laser range finder is parallel, and the light path setting altogether, install the removal subassembly in removal portion and the fixed part respectively, this removal subassembly can be with the light path of total powerstation and laser range finder's light path in the quartic reflection target.
Description
Technical Field
The invention belongs to the technical field of calibrating devices for geometric measuring devices, and relates to calibrating equipment for a laser range finder, in particular to a calibrating device for an indoor virtual baseline and a calibrating method thereof.
Background
The handheld laser range finder is used as a portable measuring instrument, uses laser as a carrier wave, has the characteristic of diffuse reflection measurement of a target surface, can realize measurement of a space short-distance by a pulse method, a phase method and other methods, and has a measuring range of 200m. According to the requirements of JJG 966-2010 (verification regulations of handheld laser range finders), detection is required in a field baseline field at a distance of more than 50 meters, the baseline field is used as a scarce resource of national strategy, most measurement units do not have the condition, and a plurality of measurement problems such as easy interference, poor repeatability and the like exist in a field mode. Therefore, how to establish a standard baseline long enough in a small indoor space is a critical issue in the verification process of the handheld laser range finder at present.
In 2016, qiao Weidong et al (Qiao Weidong, zhao Min, liu Kang, et al, handheld laser range finder calibration methods and systems research [ J ] metrology report, 2016, (1): 15-18) reproduced a standard length of 50m on a 16m guide rail, while Wang Longlai (development of a novel handheld laser range finder detection device [ J ] chinese metrology, 2016, (10): 71-74) further broadened the measurement range of the baseline system to 160m by three plane mirror sets. Li Yiming in 2017 (research on automatic verification key technology of handheld laser rangefinder [ D ]. Tianjin: tianjin university, 2017) combines automatic control and visual detection technology to realize automatic verification of the rangefinder, but the measurement range of the system only reaches 50m. It can be seen that the existing outdoor and indoor detection methods cannot establish a length detection reference with a measuring range of 200m.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an indoor virtual baseline calibrating device and a derived calibrating method thereof, wherein three plane reflectors are used for folding a light path on a 50m high-precision guide rail, quadruple light path multiplication is realized, a 200m indoor baseline is built, and then an indication error calibrating experiment of a 50-200 m measuring section can be carried out on a handheld laser range finder.
The invention is realized by the following technical scheme:
indoor virtual baseline calibrating installation, including the examination platform of a length to setting up, install the guide rail in the examination platform, the one end of this guide rail sets up to the fixed part, and slide rail middle part slidable mounting has removal portion, its characterized in that: install adjustment platform and reflection target side by side along the width direction of examination platform in the fixed part, wherein but the laser range finder that the inspection was waited to movable installation in the adjustment platform, a total powerstation is installed to laser range finder one side of emitting position dorsad the light path of total powerstation and laser range finder is parallel, and the setting of total powerstation and laser range finder is total to the light path, install the removal subassembly in removal portion and the fixed part respectively, this removal subassembly can be with the light path of total powerstation and laser range finder's light path in the quartic reflection target.
Furthermore, a reflecting sheet is additionally arranged on the reflecting surface of the reflecting plate.
Furthermore, a first diaphragm and a second diaphragm are sequentially installed between the laser emitting position of the laser range finder to be detected and the reflection assembly, and the heights of the first diaphragm and the second diaphragm are adjustable.
Further, the second diaphragm is installed in the moving part.
Furthermore, the reflection assembly comprises three plane mirrors, the three plane mirrors are sequentially arranged into a first plane mirror, a second plane mirror and a third plane mirror according to the reflection sequence of the light path, the first plane mirror and the third plane mirror are arranged in the moving part side by side at intervals and symmetrically arranged in the moving part, the second plane mirror is arranged in the fixed part, the distance between the first plane mirror and the third plane mirror is 220mm, the reflection surfaces of the first plane mirror and the third plane mirror are mutually included angles, the included angles are obtuse angles, and the first plane mirror and the third plane mirror can swing in the horizontal plane to adjust the relative angles of the two plane mirrors.
Furthermore, the three plane mirrors are located at the same horizontal height, and the vertical plane where each plane mirror is located is perpendicular to the plane where the guide rail extends.
An assay method using the indoor virtual baseline assay device of any one of claims 1 to 6, wherein: the method comprises the following steps:
step 1: designing an optical path; step 2: collecting data; and 3, step 3: a value indicating error verification scheme;
step 1.1, before verification, ensuring the perpendicularity of a second plane mirror and the motion direction of a guide rail as much as possible, and setting the transverse distance between the first plane mirror and the third plane mirror to be 220mm;
step 1.2: l. the oc For moving the position of the end, the included angle between the light lines zeta and l is related to the position of the calibrating point oc The specific calculation method is shown in formula 1
Step 1.3: the second diaphragm in the moving part is used for ensuring the parallelism of the total station light path and the motion direction of the guide rail, and the common light path adjustment of the first diaphragm and the second diaphragm is realized through the first diaphragm and the second diaphragm on the premise that the heights of the laser range finder light path and the total station light path are consistent;
step 2: the laser range finder adopts a front reference measurement mode, and the total station firstly measures the distance L between the total station and the front end surface of the adjusting platform, namely the front reference surface of the laser range finder 0f Moving the mobile terminal to a certain verification point, different ones oc Corresponding to different zeta indexes, the yaw angles of the first plane mirror and the third plane mirror are required to be adjusted again at different verification points, and the positions of all elements are kept unchanged; the laser range finder indication L at the time is obtained at the corresponding verification point mr And total station indication value L mt Calculating according to the formula 2 to obtain the length L of the standard base line corresponding to the verification point s ；
L s ＝L mt -L 0f Formula 2
And step 3: in the experimental process, the total station selects any surface measurement mode, and because the total station has higher requirement on light intensity in distance measurement, a reflector plate is adhered on the reflection target to measure the reference value L of the total station 0f When the distance measuring device is used, the reflector plate is required to be pasted, and because the reflector plate is used in the two distance measuring processes, the additional optical path introduced by the reflector plate can be offset, and L cannot be influenced s Causing an impact; the light spot of the laser range finder also falls on the reflector plate, and the indication value of the laser range finder needs the thickness t of the reflector plate re Correcting, namely calculating the indicating value error delta of the laser range finder at a certain calibration point through a formula 3;
δ＝(L mr +t re )-L s ＝(L mr +t re )-(L mt -L of ) And (4) formula 3.
In step 2, when the distance is not long enough, the laser distance meter may display a 256 error, which indicates that the light intensity reflected by the reflector plate is too large, and the aperture of the second diaphragm can be properly reduced until the distance measurement requirement of the laser distance meter is met; when the distance is large, the total station possibly has a situation that distance measurement cannot be carried out, the fact that the heights of the two diaphragms are reduced to the minimum can be confirmed firstly, light of the total station is prevented from being shielded by the diaphragms, then the position of the light spot on the target is adjusted by adjusting the angle of the plane mirror III so as to change the position relation between the target and the incident light of the target, or the angle of the target is slightly adjusted, the receiving light intensity of the total station is increased by the two methods, and normal distance measurement of the total station is guaranteed.
In step 3, the rangefinder reads the indication D five times at the same verification point k (k =1, 2, 3, 4, 5), and L is obtained by averaging mr Total station value L tf Is L mt And L 0f The difference is measured by a vernier caliper to obtain the thickness t of the reflector re =0.4mm, and δ was calculated according to equation 3.
The invention has the advantages and positive effects that:
according to the invention, an indoor base line of 200m is built through three plane mirrors, the length of the base line is calibrated by using the total station, the common light path adjustment precision of the distance measuring instrument light path and the total station light path is improved by means of two diaphragms, the calibration precision and efficiency are improved, and the indication error calibration work of the handheld laser distance measuring instrument in a measuring section of 50-200 m is completed. The receiving light intensity of the distance measuring instrument is reduced by reducing the aperture of the diaphragm, and the receiving light intensity of the total station is increased by adjusting the position relation between the target and the incident light, so that the problem that the distance measuring instrument and the total station cannot normally measure distance in part measuring sections is solved.
The invention researches an indoor virtual baseline measurement method based on light path folding, shortens indoor long-distance measurement in a large space to short-distance measurement in a small space, and can be applied to detection of a handheld laser range finder in a full-range indoor environment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram illustrating parallelism errors of two optical paths.
1. The total station comprises a total station, 2 an adjusting platform, 3 a fixed part, 4 a laser range finder, 5 a diaphragm I, 6 a guide rail, 7 a diaphragm II, 8 a plane mirror I, 9 a moving part, 10 a plane mirror III, 11 a plane mirror II, 12 a reflector plate and 13 a reflection target
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The indoor virtual baseline calibrating device comprises a calibrating table arranged in the longitudinal direction, wherein a guide rail 6 is installed in the calibrating table, one end of the guide rail is provided with a fixed part 3, and the middle part of the guide rail is provided with a moving part 9 in a sliding manner.
In this embodiment, the adjustment platform has a three-way adjustment function, and the structure thereof may adopt the following embodiments. The adjusting platform comprises a fixed table, a clamping device is installed at one end of the fixed table and used for fixing one end of the calibrating table, a manual angular displacement table is installed in the fixed table, a manual rotating table is fixedly installed above the manual angular displacement table, a fixed seat is installed above the manual rotating table and comprises a bottom plate, the upper end face of the bottom plate is flatly arranged, the plane of the bottom plate is parallel to the plane of the upper end face of the calibrating table, a reference plate is vertically installed on one side, close to the calibrating table, of the bottom plate and on one side opposite to the calibrating table respectively, a through hole is formed in the middle of the reference plate on one side, close to the calibrating table, of the bottom plate and used for emitting laser of the laser range finder, and a pressing device is installed beside the bottom plate and used for pressing and fixing the laser range finder in the upper end face of the bottom plate; the pressing device comprises lifting rods, the lifting rods are vertically installed beside the bottom plate at intervals, and the lifting plates are sleeved outside the lifting rods. Wherein the laser range finder to be detected is fixedly clamped in the fixing seat.
In this embodiment, the reflection target is fixed by a right-angle fixing block, is arranged perpendicular to the length direction of the track, and can be provided with an angular displacement table and a rotating table to adjust the pitch angle and the yaw angle.
In this embodiment, the length of the guide rail should be greater than 50 meters, and the adjustable maximum gap between the moving part and the fixed part in the guide rail should be not less than 50 meters.
In this embodiment, a reflective sheet 12 is additionally provided on the reflective surface of the reflective plate.
In this embodiment, install diaphragm one 5 and diaphragm two 7 in order between waiting the laser range finder's laser outgoing position to the reflection component, diaphragm one and diaphragm two's height-adjustable.
In this embodiment, the second diaphragm is mounted in the moving portion.
In this embodiment, the reflection assembly includes three plane mirrors, the three plane mirrors are sequentially arranged as a first plane mirror 8, a second plane mirror 11 and a third plane mirror 10 according to the reflection order of the light path, the first plane mirror and the third plane mirror are symmetrically arranged in the moving part side by side at intervals, the second plane mirror is arranged in the fixed part, the distance between the first plane mirror and the third plane mirror is 220mm, the reflection surfaces of the first plane mirror and the third plane mirror form an included angle with each other, the included angle is an obtuse angle, and the first plane mirror and the third plane mirror can swing in the horizontal plane to adjust the relative angle of the two plane mirrors.
In this embodiment, the three plane mirrors are located at the same horizontal height, and a vertical plane on which each plane mirror is located is perpendicular to a plane on which the guide rail extends.
The using process of the invention is as follows:
when the invention is used, the verification method using the indoor virtual baseline verification device comprises the following steps:
step 1: designing an optical path; step 2: collecting data; and step 3: a value indicating error verification scheme;
step 1.1, before verification, ensuring the perpendicularity of a second plane mirror and the motion direction of a guide rail as much as possible, and setting the transverse distance between the first plane mirror and the third plane mirror to be 220mm;
step 1.2: l oc For moving the position of the end, the included angle between the light lines zeta and l is related to the position of the calibrating point oc The specific calculation method is shown in formula 1
Step 1.3: the second diaphragm in the moving part is used for ensuring the parallelism of the total station light path and the motion direction of the guide rail, and the common light path adjustment of the first diaphragm and the second diaphragm is realized through the first diaphragm and the second diaphragm on the premise that the heights of the laser range finder light path and the total station light path are consistent;
step 2: the laser range finder adopts a front reference measurement mode, and the total station firstly measures the distance L between the total station and the front end surface of the adjusting platform, namely the front reference surface of the laser range finder 0f Moving the mobile terminal to a certain verification point, different ones oc Corresponding to different zeta indexes, the yaw angles of the first plane mirror and the third plane mirror are required to be adjusted again at different verification points, and the positions of all elements are kept unchanged; the laser range finder indication L at the time is obtained at the corresponding verification point mr And total station indication value L mt Calculating according to the formula 2 to obtain the length L of the standard base line corresponding to the verification point s ；
L s ＝L mt -L 0f (2)
And step 3: in the experimental process, the total station selects any surface measurement mode, and because the total station has higher requirement on light intensity in distance measurement, a reflector plate is adhered on the reflection target to measure the reference value L of the total station 0f When the distance measuring device is used, the reflector plate is required to be pasted, and because the reflector plate is used in the two distance measuring processes, the additional optical path introduced by the reflector plate can be offset, and L cannot be influenced s Causing an impact; the light spot of the laser range finder also falls on the reflector plate, and the indication value of the light spot needs the thickness t of the reflector plate re Correcting, namely calculating the indicating value error delta of the laser range finder at a certain calibration point through a formula 3;
δ＝(L mr +t re )-L s ＝(L mr +t re )-(L mt -L of ) (3)。
in step 2, when the distance is not long enough, the laser range finder may display a 256 error, which indicates that the light intensity reflected by the reflector plate is too large, and the aperture of the second diaphragm can be reduced appropriately until the distance measurement requirement of the laser range finder is met; when the distance is large, the total station may have a situation that distance measurement cannot be performed, the total station can firstly confirm that the heights of the two diaphragms are reduced to the minimum, the diaphragms are prevented from shielding the light of the total station, then the position of the light spot on the target is adjusted by adjusting the angle of the plane mirror III so as to change the position relation between the target and the incident light, or the angle of the target is slightly adjusted, and the received light intensity of the total station is increased by the two methods, so that normal distance measurement of the total station is ensured.
In step 3, the rangefinder reads the indication D five times at the same verification point k (k＝1、2、3、4、5)，Taking the average value L mr Total station value L tf Is L mt And L 0f The difference is measured by a vernier caliper to obtain the thickness t of the reflector re =0.4mm, and δ was calculated according to equation 3.
The following examples were analyzed for data and results collected during the actual calibration process:
the experimental results of the indicating value error of more than 50m are shown in the table 1, and the indicating value error verification results of the range finder in the measuring section of 50-200 m are shown in the table as follows: delta =9.3mm, and the maximum allowable indication error value of the 0-grade laser range finder is 1.5mm +5 × 10 -5 D r Wherein D is r The measurement distance of the distance meter is shown, and proved by checking, the indication error detection result of each detection point in a measurement section of 50-200 m can meet the requirement.
TABLE 1 data of measurement results
Tab.1 Data of measurement resultsmm
The measurement uncertainty evaluation is given by equation (3), and the uncertainty evaluation model of the indication error verification result of the distance meter at 200m is as follows:
in the formula: u (L) mr ) Is the uncertainty component introduced by the repeatability error of the rangefinder at 200 m; u (t) re ) Is an uncertainty component introduced by reflector thickness measurement errors; u (L) mt ) Is the uncertainty component introduced by the range error of the total station at 200 m; u (L) 0f ) Is an uncertainty component introduced by a total station reference value calibration error;
calculating u (L) by a range method mr ) Since the number of measurements is 5 and the range coefficient is 2.33, then:
the resolution of the vernier caliper is 0.02mm, subject to uniform distribution, then:
the distance measurement error of the total station is mainly determined by the reading error L of the total station tr1 Position error L of reflector plate po1 Cosine error L of total station light path and distance meter light path pa And Abbe error L ab And (4) introducing.
(1) The standard distance difference of the I-stage phase type photoelectric distance meter is (1 + 1D) t ) mm, then D t When =200m, the distance measurement precision of the total station can be 1.2mm, and the distance measurement precision is subject to uniform distribution, so that:
(2) Consider the angular error of reflector plate and total station instrument light vertical plane
When the area of the reflector plate is 10cm multiplied by 10cm, the maximum optical path deviation is about 0.0873mm, and the reflector plate is uniformly distributed, and the following components are provided:
(3) As can be seen from fig. 2, the included angle between the distance measuring instrument optical path and the total station optical path can be limited to be within 0.057 °, and the cosine error at 200m follows uniform distribution, then:
(4) The total station light path and the distance measuring instrument light path are not collinear, and Abbe error can be generated [15,16] From fruit ofAn abbe arm is estimated to be about 3.5mm by experiment, then the angle error of the two optical paths caused by the comprehensive factors is estimated to be 0.001 radian according to fig. 2, and uniform distribution is obeyed, then:
in summary, the following results can be obtained: u (L) mt )≈0.70mm。
The total station reference calibration error is mainly determined by the reading error L of the total station tr2 And the position error L of the reflector plate po2 And (4) introducing. When D is present t If the distance measurement precision of the total station is about 1.0027mm when the distance measurement precision is not less than 2715.4mm, and the distance measurement precision is about 1.0027mm, the distance measurement precision is subject to uniform distribution, and u (L) is obtained tr2 ) Is approximately equal to 0.579mm; and u (L) is derived from formula (8) po2 ) Is approximately equal to 0.051mm. Therefore, there are:
since there is no considerable correlation between the inputs, the synthetic standard uncertainty can be calculated according to the following equation:
the final spread uncertainty of δ available is U (δ) =2.3mm (k = 2), when D r The maximum allowable error MPE of the 0-stage range finder at 200m is 11.5mm, and U (delta) < MPE/3, which indicates that the system has high verification accuracy.
According to the invention, an indoor base line of 200m is built through three plane mirrors, the length of the base line is calibrated by using the total station, the common light path adjustment precision of the distance measuring instrument light path and the total station light path is improved by means of two diaphragms, the calibration precision and efficiency are improved, and the indication error calibration work of the handheld laser distance measuring instrument in a measuring section of 50-200 m is completed. The receiving light intensity of the distance measuring instrument is reduced by reducing the aperture of the diaphragm, and the receiving light intensity of the total station is increased by adjusting the position relation between the target and the incident light, so that the problem that the distance measuring instrument and the total station cannot normally measure distance in part measuring sections is solved.
The invention researches an indoor virtual baseline measurement method based on light path folding, shortens indoor long-distance measurement in a large space to short-distance measurement in a small space, and can be applied to detection of a handheld laser range finder in a full-range indoor environment. The experimental results show that the measurement range of the system can reach 200m, the expansion uncertainty of the indication error verification result is within 2.3mm (k = 2), the measurement precision of the built indoor virtual length baseline field is high, and the method has important reference value and reference significance.
Claims (4)
1. Indoor virtual baseline calibrating installation, including the examination platform of a length to setting up, install the guide rail in the examination platform, the one end of this guide rail sets up to the fixed part, and slide rail middle part slidable mounting has removal portion, its characterized in that: an adjusting platform and a reflecting target are arranged in the fixing part side by side along the width direction of the verification platform, a laser range finder to be detected is movably arranged in the adjusting platform, a total station is arranged on one side of the laser range finder, which is back to a laser emitting position, light paths of the total station and the laser range finder are parallel and arranged in a common light path, and moving components are respectively arranged in the moving part and the fixing part and can reflect the light paths of the total station and the laser range finder into the reflecting target for three times;
a reflecting sheet is additionally arranged on the reflecting surface of the reflecting target;
a first diaphragm and a second diaphragm are sequentially arranged between a laser emergent position of the laser range finder to be detected and the reflecting component, and the heights of the first diaphragm and the second diaphragm are adjustable;
the diaphragm II is arranged in the moving part;
the reflecting assembly comprises three plane mirrors, the three plane mirrors are sequentially arranged into a first plane mirror, a second plane mirror and a third plane mirror according to the reflecting sequence of a light path, the first plane mirror and the third plane mirror are arranged side by side at intervals and symmetrically arranged in the moving part, the second plane mirror is arranged in the fixed part, the distance between the first plane mirror and the third plane mirror is 220mm, the reflecting surfaces of the first plane mirror and the third plane mirror form an included angle with each other, the included angle is an obtuse angle, and the first plane mirror and the third plane mirror can swing in the horizontal plane to adjust the relative angle of the two plane mirrors; the three plane mirrors are positioned at the same horizontal height, and the vertical plane where each plane mirror is positioned is vertical to the plane where the guide rail extends.
2. The verification method using the indoor virtual baseline verification apparatus as claimed in claim 1, wherein: the method comprises the following steps:
step 1: designing an optical path; step 2: collecting data; and step 3: a value indicating error verification scheme;
step 1.1, before verification, ensuring the perpendicularity of a second plane mirror and the motion direction of a guide rail as much as possible, and setting the transverse distance between the first plane mirror and the third plane mirror to be 220mm;
step 1.2:locfor moving the end position, the angle between the light lines is related to the position of the verification point
Andlocin connection with, in particular
The calculation method is shown in formula 1
Step 1.3: the second diaphragm in the moving part is used for ensuring the parallelism of the total station light path and the motion direction of the guide rail, and the common light path adjustment of the first diaphragm and the second diaphragm is realized through the first diaphragm and the second diaphragm on the premise that the heights of the laser range finder light path and the total station light path are consistent;
step 2: the laser range finder measures the distance between the total station and the front reference surface of the laser range finder in a front reference measurement modeL0fThe front reference surface of the laser range finder is the front end surface of the adjusting platform, and then the movable end is moved to a certain verification point, which is differentlocCorrespond to different
Requiring at different certification sitesReadjusting the yaw angles of the first plane mirror and the third plane mirror, and keeping the positions of all elements unchanged; obtaining the laser range finder indication value at the corresponding verification pointLmrAnd total station indicationLmtCalculating according to the formula 2 to obtain the length of the standard base line corresponding to the verification pointLs；
And step 3: in the experimental process, the total station selects any surface measurement mode, and because the total station has higher requirement on light intensity in distance measurement, a reflector plate is adhered on the reflection target to measure the reference value of the total stationL0fWhen the distance measuring device is used, the reflector plate is required to be pasted, and because the reflector plate is used in the two distance measuring processes, the additional optical path introduced by the reflector plate can be offset, and the additional optical path can not be alignedLsCausing an impact; the light spot of the laser range finder also falls on the reflector plate, and the indication value of the laser range finder needs the thickness of the reflector platetreCorrecting, the indication value of the laser range finder at a certain verification point
Error of
Can be calculated by equation 3;
3. The method of certification of a indoor virtual baseline certification device according to claim 2, wherein: said step 2
When the distance is not long enough, the laser range finder may display a 256 error, which indicates that the light intensity reflected by the reflector plate is too large, and the aperture of the second diaphragm can be properly reduced until the distance measurement requirement of the laser range finder is met; when the distance is large, the total station may have a situation that distance measurement cannot be performed, the total station can firstly confirm that the heights of the two diaphragms are reduced to the minimum, the diaphragms are prevented from shielding the light of the total station, then the position of the light spot on the target is adjusted by adjusting the angle of the plane mirror III so as to change the position relation between the target and the incident light, or the angle of the target is slightly adjusted, and the received light intensity of the total station is increased by the two methods, so that normal distance measurement of the total station is ensured.
4. The method of certification of a indoor virtual baseline certification device according to claim 2, wherein: in the step 3, the range finder reads five readings at the same verification point
Taking the average value to obtainLmrTotal station valueLtfIs composed ofLmtAndL0fthe difference is measured by a vernier caliper to measure the thickness of the reflector
Then calculated according to equation 3 to obtain
。
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| CN112729225A (en) | 2021-04-30 |
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