CN201503267U - Digital water level capable of measuring automatically - Google Patents
Digital water level capable of measuring automatically Download PDFInfo
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- CN201503267U CN201503267U CN2009203115834U CN200920311583U CN201503267U CN 201503267 U CN201503267 U CN 201503267U CN 2009203115834 U CN2009203115834 U CN 2009203115834U CN 200920311583 U CN200920311583 U CN 200920311583U CN 201503267 U CN201503267 U CN 201503267U
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Abstract
The utility model relates to a digital water level which can track a leveling rod automatically and complete measurement automatically. The digital water level comprises a wide-angle photography processing system, a telescope focusing system, a CCD device and a CPU unit, wherein the wide-angle photography processing system is used for searching a scale around under the driving of a horizontal rotating base, and subsequently calculating the azimuth and distance of the scale; the telescope focusing system is used for adjusting the direction by the horizontal rotating base according to the azimuth and distance of the scale and automatically focusing after aligning to the scale; the CCE device is used for obtaining an exact image of the scale after focusing by the telescope focusing system; and the CPU unit is used for controlling the horizontal rotating base to rotate by a corresponding angle according to the azimuth and distance of the scale so that the telescope focusing system is aligned to the scale, subsequently driving the telescope focusing system to a corresponding focal distance, obtaining the image of the scale formed in the CCD device, finally calculating the elevation and distance of the scale and memorizing the elevation and distance in a memory.
Description
Technical field
The utility model relates to a kind of digital level of automatic measurement, is specifically related to a kind of digital level that can also finish measurement from the motion tracking levelling pole automatically.
Background technology
The ultimate principle of measurement of the level is to sight the discrepancy in elevation that the staff reading that stands vertically on 2 o'clock is measured point-to-point transmission with the horizontal line of sight of spirit-leveling instrument.
Measurement of the level has optics measurement of the level and digital leveling to measure two kinds of methods.
The optics measurement of the level be use at present at most, can satisfy the leveling measuring method of various grades, use optical level and levelling pole during measurement.Optical level mainly is made up of telescope, graticule, air level, shell and pedestal, and telescope is made of object lens, focusing lens, eyepiece, and automatic compensated level also has the self leveling device.Uniformly-spaced be carved with three level silks in that vertical direction is parallel on the graticule, be called silk, middle silk and following.The levelling pole that the optics measurement of the level is used is to be shaped on uniformly-spaced delineation and to the numerical reference of the height of delineation on blade, delineation has several different patterns again for the ease of discerning uniformly-spaced. when measuring with optical level, at first spirit-leveling instrument is installed on the tripod, and according to air level leveling spirit-leveling instrument, sight levelling pole and focusing clear after, according to the position of middle silk on levelling pole on the spirit-leveling instrument graticule, read the big reading part (rice and decimetre) of height by numerical reference, again according in the distance of silk and levelling pole delineation read little reading partly (centimetre and millimeter, and less than the part of millimeter). according to going up silk and following reading that reads on the spirit-leveling instrument graticule, can calculate the distance of spirit-leveling instrument and levelling pole by the principle of similar triangles.Just can obtain the difference of diverse location height according to the reading of the middle silk of the levelling pole of diverse location. mainly by manually finishing reading, therefore the result of measurement can have the error that the observer causes, and speed is slower in the optics measurement of the level.Because measurement result is recorded on the paper medium, so on the one hand need be by manually the data input computer being calculated time-consuming like this effort again, and the easy record mistake that occurs.
Digital leveling is measured the measurement of the level that can satisfy various grades, uses digital level and bar code levelling pole during measurement.Digital level mainly is made up of telescope, graticule, air level, self leveling device, image collecting device, computing machine, power supply, shell and pedestal.The bar code levelling pole is shaped on the bar code delineation by the unequal interval of certain scheme coding on blade, and does not have numerical reference.When measuring with digital level, at first spirit-leveling instrument is installed on the tripod, and according to air level leveling spirit-leveling instrument, sight levelling pole and focusing clear after, the image collecting device that computerizeds control obtains the image of the levelling pole in the visual field, tries to achieve height and distance according to the encoding scheme and the corresponding disposal route of the image that obtains, levelling pole.Because its measurement is finished automatically by machine, so the result is stable, and speed is very fast.
Above-mentioned the deficiencies in the prior art part is: existing spirit-leveling instrument needs at least two people could finish measurement, and one of them people is responsible for work such as turning to, aiming at of spirit-leveling instrument and focusing, and another people is responsible for levelling pole is moved on another aspect from a bit.In today that cost of labor grows to even greater heights, studying a kind of digital level that can realize that the one man operation measures automatically has its significant values.
The utility model content
Technical problem to be solved in the utility model provides a kind of spirit-leveling instrument, is used for also finishing automatically from the motion tracking levelling pole digital level of measurement.
For solving the problems of the technologies described above, the utility model provides a kind of digital level of automatic measurement, comprising: the wide-angle imaging disposal system, be used under the driving that horizontally rotates pedestal, seeking scale all around, and calculate the azimuth-range at scale place then; The telescope focusing system is used for according to the azimuth-range of described scale by horizontally rotating the pedestal adjustment towards, automatic focusing behind the alignment scale; The CCD device is used for obtaining by the telescope focusing system exact image of scale after focusing; CPU element, be used for rotating corresponding angle so that telescope focusing system alignment scale according to the azimuth-range controlling level rotating basis at described scale place, drive the telescope focusing system then to corresponding focal length, and obtain in the CCD device image that forms scale, calculate the elevation and the distance of this scale at last, and store in the storer.
Further, described wide-angle imaging disposal system comprises: wide angle lens system, obtain the imageing sensor and the central processing unit that links to each other with imageing sensor of image by wide angle lens system; The wide-angle imaging disposal system is sought scale and calculate the method for azimuth-range at scale place as follows: image around described central processing unit obtains continuously by imageing sensor obtains ending when the image of scale is contained in an external world until described central processing unit; Described central processing unit finds scale by image matching algorithm and obtains its position coordinates in photo:
X1＝n1*P，
Y1＝n2*P，
Wherein, P is a pixel wide of imageing sensor, then can calculate scale position angle in the horizontal direction and be described orientation: β=((X1-0.5*N*P)/0.5*N*P) * α, wherein, N is the Horizontal number of pixels of imageing sensor, and α is the wide-angle angle of camera lens in the wide angle lens system; According to the shared pixel n3 of the length and width of image in photo of scale, n4 can calculate the distance at scale place: L=(H/n3*P) * L ', and wherein: H is the scale true altitude, and L ' is the amplification coefficient of camera optics system.
Further, the pattern on the scale of use is chequered with black and white bar code; Be the progress of guaranteeing to measure automatically, during the focusing of CPU element control fiducial mark chi, CPU element repeatedly drives and horizontally rotates pedestal and telescope focusing system, and in the CCD device, obtain corresponding image, CPU element is by the contrast of the described chequered with black and white bar code in the locational image of relatively more different focusing, judging best focusing position, thereby the telescope focusing system is accommodated to the optimum position.
As the digital level that another kind is measured automatically, the scale of use is provided with the wireless signal transmitting device that is used to detect the GPS receiver of scale position and is used for the positional information of detection scale is sent with wireless signal; Spirit-leveling instrument comprises: wireless signal receiver, the GPS receiver, the CPU element that are used to detect the spirit-leveling instrument position that is used to receive described wireless signal and draw the positional information of described scale, horizontally rotate pedestal, telescope focusing system and CCD device; CPU element is according to the information of spirit-leveling instrument position, the positional information of described scale, calculate the azimuth-range at the relative spirit-leveling instrument of scale place, then according to this azimuth-range by horizontally rotate pedestal adjust the telescope focusing system towards, control telescope focusing system automatic focusing then, and obtain in the CCD device image that forms scale, calculate the elevation and the distance of this scale at last, and store in the storer.Wherein, the pattern on the scale of use is chequered with black and white bar code; During the focusing of CPU element control fiducial mark chi, CPU element repeatedly drives and horizontally rotates pedestal and telescope focusing system, and in the CCD device, obtain corresponding image, CPU element is by the contrast of the locational image of relatively more different focusing, judging best focusing position, thereby the telescope focusing system is accommodated to the optimum position.
As the third digital level of measuring automatically, the scale of use is provided with laser reflective film or laser-bounce coating; Spirit-leveling instrument comprises: be located at the Laser emission and the receiving system that horizontally rotate on the pedestal, be used for launching laser and receiving reflection ray when horizontally rotating the pedestal rotation, to determine the azimuth-range at scale place; Spirit-leveling instrument also comprises: CPU element, telescope focusing system and CCD device; CPU element turns to this orientation according to the azimuth-range controlling level rotating basis of described scale, and control telescope focusing system automatic focusing, and obtain the image that in the CCD device, forms scale, calculate the elevation and the distance of this scale at last, and store in the storer.Wherein, the pattern on the scale of use is chequered with black and white bar code; During the focusing of CPU element control fiducial mark chi, CPU element repeatedly drives and horizontally rotates pedestal and telescope focusing system, and in the CCD device, obtain corresponding image, CPU element is by the contrast of the locational image of relatively more different focusing, judging best focusing position, thereby the telescope focusing system is accommodated to the optimum position.
The utlity model has positive effect: the spirit-leveling instrument in (1) first kind of scheme of the present utility model in use, the wide-angle imaging disposal system is sought scale all around under the driving that horizontally rotates pedestal, after finding scale, calculate coarse positional information (comprising concrete position angle and distance parameter) at scale place in the A position.Then by horizontally rotating pedestal regulation and control system mirror focusing system far away towards the A position, automatic focusing behind the alignment scale; CPU element calculates the accurate positional information (comprising elevation and range information) of this scale, and stores in the storer by obtaining the image that forms scale in the CCD device; After scale is moved on to the B position, adopt and obtain the positional information of scale in the same way in the B position, can draw the discrepancy in elevation of point-to-point transmission at last at 2 by the related data on relatively A, the B.(2) for obtaining best focusing position, CPU element repeatedly drives and horizontally rotates pedestal, angle with continuous fine adjustment telescope focusing system alignment scale, and by comparing the contrast of the described chequered with black and white bar code in the locational images of different focusing, to judge best focusing position, as Fig. 4, this moment the fiducial mark chi image in the centre imaging of CCD, thereby measuring error is reduced to minimum.Spirit-leveling instrument in (3) second kinds of schemes in use, determine the relative position of spirit-leveling instrument and scale by the GPS positioning system, controlling mirror focusing system alignment scale far away then focuses, last CPU element calculates the accurate positional information of this scale by obtaining the image that forms scale in the CCD device; This method is suitable for the measurement of big distance.Spirit-leveling instrument in (4) second kinds of schemes utilizes the principle of laser rectilinear propagation, and the scale of use is provided with laser reflective film or laser-bounce coating; Spirit-leveling instrument is suitable for transmitting and receiving simultaneously laser when using, thereby find out the approximate location at scale place,, control mirror focusing system alignment scale far away then and focus, last CPU element calculates the accurate positional information of this scale by obtaining the image that forms scale in the CCD device.
Description of drawings
For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, the utility model is described in further detail, wherein
Fig. 1 moves on to the B position for the digital level among the embodiment with the scale of A position, and the synoptic diagram of sighting again, measure, writing down automatically;
Fig. 2 is the structured flowchart of the digital level among the embodiment;
Fig. 3 is the imaging synoptic diagram of the wide-angle imaging disposal system among the embodiment;
The image that Fig. 4 forms in the CCD device when accommodating to the optimum position for telescope focusing system among the embodiment;
Fig. 5 is the elevation of the digital level of the automatic measurement among the embodiment, the calculation flow chart of distance;
Fig. 6 is the reference diagram of the calculating of the sighting distance L among the embodiment.
Embodiment
(embodiment 1)
See Fig. 1-6, the digital level of a kind of automatic measurement of the present utility model comprises: wide-angle imaging disposal system 1, be used under the driving that horizontally rotates pedestal 3, seeking scale a all around, and calculate the azimuth-range at scale a place then; Telescope focusing system 4 is used for adjusting towards, automatic focusing behind the alignment scale a by horizontally rotating pedestal 3 according to the azimuth-range of described scale a; The CCD device 5 that links to each other with CPU element 2 is used for obtaining by telescope focusing system 4 exact image of scale a after focusing; CPU element 2, be used for rotating corresponding angle so that telescope focusing system 4 alignment scale a according to the azimuth-range controlling level rotating basis 3 at described scale a place, drive telescope focusing system 4 then to corresponding focal length, and obtain in CCD device 5 image that forms scale a, calculate elevation and the distance of this scale a at last, and store in the storer.Particularly: CPU element 2 links to each other with the control motor that horizontally rotates pedestal 3, and CPU element 2 also links to each other with the focusing motor of telescope focusing system 4, and wide-angle imaging disposal system 1 and telescope focusing system 4 are located at and are horizontally rotated on the pedestal 3.
Described wide-angle imaging disposal system 1 comprises: wide angle lens system, obtain the imageing sensor and the central processing unit that links to each other with imageing sensor of image by wide angle lens system; Wide-angle imaging disposal system 1 is sought scale a and calculate the method for azimuth-range at scale a place as follows: image around described central processing unit obtains continuously by imageing sensor obtains ending when the image of scale a is contained in an external world until described central processing unit; Described central processing unit finds scale a and obtains its position coordinates in photo by image matching algorithm:
X1＝n1*P，
Y1＝n2*P，
Wherein, P is a pixel wide of imageing sensor, then can calculate scale a position angle in the horizontal direction and be described orientation: β=((X1-0.5*N*P)/0.5*N*P) * α, wherein, N is the Horizontal number of pixels of imageing sensor, and α is the wide-angle angle of camera lens in the wide angle lens system; According to the shared pixel n3 of the length and width of image in photo of scale a, n4 can calculate the distance at scale a place: L=(H/n3*P) * L ', and wherein: H is the scale true altitude, and L ' is the amplification coefficient of camera optics system.
Pattern on the scale a that uses is chequered with black and white bar code; During CPU element 2 control fiducial mark chi a focusing, CPU element drives for more than 2 time and horizontally rotates pedestal 3 and telescope focusing system 4, and in CCD device 5, obtain corresponding image, CPU element 2 is by the contrast of the described chequered with black and white bar code in the locational image of relatively more different focusing, judging best focusing position, thereby telescope focusing system 4 is accommodated to the optimum position.
See Fig. 2, wide-angle imaging disposal system 1 can identify the scale of spirit-leveling instrument in the scope of 0.5～500m during use, and the position that calculates its place (comprises distance, the position angle), and position data is transferred to CPU element 2, CPU element 2 output signals, driving horizontally rotates pedestal 3 rotations and aims at the spirit-leveling instrument scale, it is last to given distance to drive telescope focusing system 4 simultaneously, in CCD device 5, will form the image of scale a this moment, by amplifier 6, analog to digital converter 7 transfers signals to CPU element 2, CPU element 2 can horizontally rotate pedestal 3 and telescope focusing system (4) obtaining best image by calculating repeatedly to drive, and then the elevation at calculating place scale place and distance store in the storer.Can draw the discrepancy in elevation of point-to-point transmission by the related data on relatively A, the B at 2, and show by display.
See Fig. 3, the image in the wide-angle imaging machine can go out azimuth angle alpha and the distance L of scale a according to this image calculation; See Fig. 4, the image in can CCD device 5 calculates precision, distance L and the elevation H of focusing.Wherein, sighting distance computing formula: L=f*H/X+C, in the formula, L: instrument is to the distance of scale; F: the telescopical focal length of spirit-leveling instrument; H: the width of bar code; X: the imaging width of bar code on CCD; C: revise constant.
(embodiment 2)
On the basis of embodiment 1, the digital level of the automatic measurement of present embodiment has following distortion:
The scale a that uses is provided with laser reflective film or laser-bounce coating; Spirit-leveling instrument b comprises: be located at the Laser emission and the receiving system that horizontally rotate on the pedestal 3, be used for launching laser and receiving reflection ray when horizontally rotating pedestal 3 rotations, to determine the azimuth-range at scale a place; Spirit-leveling instrument b also comprises: CPU element 2, telescope focusing system 4 and CCD device 5; CPU element 2 turns to this orientation according to the azimuth-range controlling level rotating basis 3 of described scale a, and control telescope focusing system 4 automatic focusings, and obtain the image that in CCD device 5, forms scale a, calculate elevation and the distance of this scale a at last, and store in the storer.
Wherein, the pattern on the scale a of use is chequered with black and white bar code; During CPU element 2 control fiducial mark chi a focusing, CPU element drives for more than 2 time and horizontally rotates pedestal 3 and telescope focusing system 4, and in CCD device 5, obtain corresponding image, CPU element 2 is by the contrast of the described chequered with black and white bar code in the locational image of relatively more different focusing, judging best focusing position, thereby telescope focusing system 4 is accommodated to the optimum position.
(embodiment 3)
On the basis of embodiment 1, the digital level of the automatic measurement of present embodiment has following distortion:
The scale a that uses is provided with the wireless signal transmitting device that is used to detect the GPS receiver of scale a position and is used for the positional information of detection scale a is sent with wireless signal.
Spirit-leveling instrument b comprises: be used to the wireless signal receiver that receives described wireless signal and draw the positional information of described scale a, the GPS receiver that is used to detect spirit-leveling instrument b position, CPU element 2, horizontally rotate pedestal 3, telescope focusing system 4 and CCD device 5; CPU element 2 is according to the information of spirit-leveling instrument b position, the positional information of described scale a, calculate the azimuth-range at the relative spirit-leveling instrument b of scale a place, then according to this azimuth-range by horizontally rotate pedestal 3 adjust telescope focusing systems 4 towards, control telescope focusing system 4 automatic focusings then, and obtain in CCD device 5 image that forms scale a, calculate elevation and the distance of this scale a at last, and store in the storer.
Wherein, the pattern on the scale a of use is chequered with black and white bar code; During CPU element 2 control fiducial mark chi a focusing, CPU element drives for more than 2 time and horizontally rotates pedestal 3 and telescope focusing system 4, and in CCD device 5, obtain corresponding image, CPU element 2 is by the contrast of the described chequered with black and white bar code in the locational image of relatively more different focusing, judging best focusing position, thereby telescope focusing system 4 is accommodated to the optimum position.
The major function of described GPS receiver is can capture by the selected satellite to be measured of certain satellite cutoff angle, and follows the tracks of the operation of these satellites.Arrive the satellite-signal of tracking when receiver acquisition after, just can measure receiving antenna, demodulate data such as satellite orbit parameter to the pseudo-distance of satellite and the rate of change of distance.According to these data, the little process computer in the receiver just can position calculating by the positioning calculation method, calculate the longitude and latitude of user geographic location, highly, information such as speed, time.
(embodiment 4)
On the basis of embodiment 2, the digital level of the automatic measurement of present embodiment has following distortion:
As another kind of embodiment, CPU element 2 among the spirit-leveling instrument b can be directly according to the scale a in the A position send gps signal and the gps signal that sends of the scale a in the B position, the gps signal that directly calculates the position calculates the discrepancy in elevation of 2 of A, B, and shows by display.
Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection domain of the present utility model.
Claims (7)
1. digital level of automatically measuring is characterized in that comprising:
Seek the wide-angle imaging disposal system (1) of scale (a) around being used under the driving that horizontally rotates pedestal (3) with the azimuth-range that calculates scale (a) place;
Be used for according to the azimuth-range of described scale (a) by horizontally rotate pedestal (3) adjust towards, and at the telescope focusing system (4) of alignment scale (a) back automatic focusing;
Be used for after focusing, obtaining the CCD device (5) of the exact image of scale (a) by telescope focusing system (4);
Be used for according to the azimuth-range controlling level rotating basis (3) at described scale (a) the place corresponding angle of rotation so that telescope focusing system (4) alignment scale (a) and drive telescope focusing system (4), with the image that obtains formation scale (a) in CCD device (5) and calculate the elevation of this scale (a) and the CPU element (2) of distance to corresponding focal length.
2. the digital level of a kind of automatic measurement according to claim 1, it is characterized in that: described wide-angle imaging disposal system (1) comprising: wide angle lens system, obtain the imageing sensor and the central processing unit that links to each other with imageing sensor of image by wide angle lens system.
3. the digital level of a kind of automatic measurement according to claim 1 and 2, it is characterized in that: the pattern on the scale of use (a) is chequered with black and white bar code.
4. digital level of automatically measuring is characterized in that:
The scale (a) that uses is provided with the GPS receiver and the wireless signal transmitting device that is used for the positional information that detects scale (a) is sent with wireless signal that is used to detect scale (a) position;
Spirit-leveling instrument (b) comprising: be used to the wireless signal receiver that receives described wireless signal and draw the positional information of described scale (a), be used to detect the GPS receiver of spirit-leveling instrument (b) position, horizontally rotate pedestal (3), telescope focusing system (4), CCD device (5), and be used for information according to spirit-leveling instrument (b) position, the positional information calculation of described scale (a) goes out scale (a) azimuth-range at spirit-leveling instrument (b) place relatively, and according to this azimuth-range by horizontally rotate pedestal (3) adjust telescope focusing system (4) towards control telescope focusing system (4) automatic focusing and obtain the image that in CCD device (5), forms scale (a), calculate at last this scale (a) elevation and apart from and store CPU element (2) in the storer into.
5. the digital level of a kind of automatic measurement according to claim 4, it is characterized in that: the pattern on the scale of use (a) is chequered with black and white bar code.
6. digital level of automatically measuring is characterized in that:
The scale (a) that uses is provided with laser reflective film or laser-bounce coating;
Spirit-leveling instrument (b) comprising: be located at the Laser emission and the receiving system that horizontally rotate on the pedestal (3), be used for launching laser and receiving reflection ray when horizontally rotating pedestal (3) rotation, to determine the azimuth-range at scale (a) place;
Spirit-leveling instrument (b) also comprises: telescope focusing system (4), CCD device (5), and turn to this orientation and control telescope focusing system (4) automatic focusing according to the azimuth-range controlling level rotating basis (3) of described scale (a), and obtain in CCD device (5) image that forms scale (a), calculate the elevation and the distance of this scale (a) at last and store CPU element (2) in the storer into.
7. the digital level of a kind of automatic measurement according to claim 6, it is characterized in that: the pattern on the scale of use (a) is chequered with black and white bar code.
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| CN2009203115834U CN201503267U (en) | 2009-09-27 | 2009-09-27 | Digital water level capable of measuring automatically |
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| CN2009203115834U CN201503267U (en) | 2009-09-27 | 2009-09-27 | Digital water level capable of measuring automatically |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666642B (en) * | 2009-09-27 | 2011-09-28 | 常州市新瑞得仪器有限公司 | Digital level capable of automatically measuring |
| WO2013085956A1 (en) | 2011-12-06 | 2013-06-13 | Trimble Navigation Limited | Robotic leveling |
| TWI405954B (en) * | 2010-08-24 | 2013-08-21 | Asia Optical Co Inc | Reticle, digital image level and image recognition method |
| CN112268189A (en) * | 2020-10-25 | 2021-01-26 | 江苏海洋大学 | Intelligent leveling ruler robot |
| CN115597839A (en) * | 2022-12-13 | 2023-01-13 | 苏州熠品质量技术服务有限公司（Cn） | Method and system for measuring focal length by using relative displacement |
-
2009
- 2009-09-27 CN CN2009203115834U patent/CN201503267U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666642B (en) * | 2009-09-27 | 2011-09-28 | 常州市新瑞得仪器有限公司 | Digital level capable of automatically measuring |
| TWI405954B (en) * | 2010-08-24 | 2013-08-21 | Asia Optical Co Inc | Reticle, digital image level and image recognition method |
| WO2013085956A1 (en) | 2011-12-06 | 2013-06-13 | Trimble Navigation Limited | Robotic leveling |
| CN104011502A (en) * | 2011-12-06 | 2014-08-27 | 天宝导航有限公司 | Robotic leveling |
| EP2788715A4 (en) * | 2011-12-06 | 2015-08-19 | Trimble Navigation Ltd | Robotic leveling |
| CN104011502B (en) * | 2011-12-06 | 2017-03-29 | 天宝导航有限公司 | Automatically the measurement of the level |
| CN112268189A (en) * | 2020-10-25 | 2021-01-26 | 江苏海洋大学 | Intelligent leveling ruler robot |
| CN115597839A (en) * | 2022-12-13 | 2023-01-13 | 苏州熠品质量技术服务有限公司（Cn） | Method and system for measuring focal length by using relative displacement |
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Granted publication date: 20100609 Effective date of abandoning: 20090927 |