CN1235013C - Vacuum laser dam deformation measuring method - Google Patents
Vacuum laser dam deformation measuring method Download PDFInfo
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- CN1235013C CN1235013C CN 200310105231 CN200310105231A CN1235013C CN 1235013 C CN1235013 C CN 1235013C CN 200310105231 CN200310105231 CN 200310105231 CN 200310105231 A CN200310105231 A CN 200310105231A CN 1235013 C CN1235013 C CN 1235013C
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Abstract
The present invention relates to a vacuum laser dam deformation measuring method which belongs to the technical field of optical and photoelectric detection and geometric position measurement and is characterized in that a two-dimension position adjustment mechanism is arranged between a measuring point base and a zone plate. The two-dimension position adjustment mechanism is utilized to regulate the position where the zone plate corresponds to the measuring point base when the measurement is carried out, which makes laser light spots arriving at a laser receiver positioned near the center of the laser receiver. The shift of the measuring point can be worked out according to the displacement of the zone plate relative to the measuring point base and the offset of the light spot on the laser receiver. The present invention has the effects and benefits that due to the fact that the light spot is always near the center of the laser receiver when the measurement is carried out, the diameter of a vacuum pipe at a receiving end can be largely decreased, and simultaneously, the requirements of the acceptance range of the laser receiver are lowered. Thereby, the goals of decreasing the diameter of the vacuum pipe, lowering system cost and decreasing the degree of difficulty of construction are reached.
Description
Technical field
The invention belongs to optics, Photoelectric Detection and geometric position field of measuring technique, relate to and a kind ofly utilize the laser beam in the vacuum pipe that micro-displacement is measured, specially refer to the measuring method of the vacuum pipe diameter that can reduce vacuum laser dam deformation measuring system.
Background technology
Owing to when laser is propagated in a vacuum, can avoid, thereby in engineering, be used to realize the high-precision deformation measurement because the influence that atmospheric turbulence and air themperature gradient and pressure gradient are brought is a desirable straight line.Vacuum laser dam deformation measuring system is exactly that a kind of typical case uses, and is used for the horizontal sliding and the vertical sedimentation of dam dam body are carried out high precision monitor, compares with the monitoring device of other types, has the measuring accuracy height, the advantage of long-term reliability and good stability.
The vacuum laser dam deformation measuring system of practical application at present is made up of vacuum pipe 1, LASER Light Source 2, zone plate 3, measuring point pedestal 5 and laser pickoff 4 as shown in Figure 1.LASER Light Source 2, zone plate 3 and laser pickoff 4 are mounted point-blank, and two ends are LASER Light Source 2 and laser pickoff 4, and the centre is a zone plate 3.Laser arrives laser pickoff 4 from the LASER Light Source 2s through zone plate 3, because the imaging effect of zone plate 3, can on laser pickoff 4, form a laser spot, under desirable condition, the center c of laser spot is point-blank on the center a of LASER Light Source 2, the center b of zone plate 3 and the laser pickoff 4.If LASER Light Source 2 and laser pickoff 4 are positioned on two reference points and maintain static, then moving of zone plate 3 will cause moving of luminous point on the laser pickoff 4, by the displacement Δ y of laser spot on the Laser Measurement receiver, just can calculate the displacement Δ y1 of zone plate 3.
For measuring the displacement of testee, zone plate 3 directly is fixed on the testee displacement of measuring testee by the displacement of measuring zone plate 3 by measuring point pedestal 5.
Be to realize high-acruracy survey, avoid the influence of the bending of light that atmospheric disturbance and thermograde cause, must adopt vacuum pipe 1, guarantee that laser beam propagates under desirable condition whole laser optical path and isolated from atmosphere.
In said system, distance L is bigger between LASER Light Source 2 and laser pickoff 4, and distance L 1 is hour between LASER Light Source 2 and the zone plate 3, because optics amplification, the displacement Δ y1 that zone plate is 3 tens of millimeters, can cause the luminous point on the laser pickoff 4 to produce hundreds of millimeters displacement Δ y according to triangle relation (Δ y/ Δ y1=L/L1), thereby requirement is necessary enough big at the diameter of receiving end vacuum pipe, so that necessary light path to be provided.Therefore in existing system, vacuum pipe 1 is designed at LASER Light Source 2 end diameters less, and bigger at laser pickoff 4 end diameters (Dmax), the form of approximate taper, as shown in Figure 1.For example be located at the vacuum laser dam deformation measuring device in plentiful power station, its vacuum pipe is about 1 km, near LASER Light Source end pipe diameter less than 200 millimeters, and just reach about 500 millimeters at the receiving end pipe diameter.
Because existing system vacuum pipe diameter is bigger, not only make system cost very high, and because whole vacuum pipe volume is bigger, the installation of pumped vacuum systems and pipeline and the requirement of sealing are also improved greatly, for the existing method in overlength dam even be difficult to carry out, can can therefore, reduce the vacuum pipe diameter, be one of the key factor that be promoted the use of of vacuum laser dam deformation measuring system.
Summary of the invention
The purpose of this invention is to provide a kind of improved vacuum laser dam deformation measurement method, can use the vacuum pipe than the tubule footpath, the vacuum pipe diameter is big to solve, the too high problem of cost.
Technical scheme of the present invention is by improving existing vacuum laser dam deformation measuring device and method, a two-dimensional position adjusting mechanism is set between zone plate, measuring point pedestal, and to change the original deflection method of measurement be that differential method of measurement is realized, can solve big, the too high problem of cost of vacuum pipe diameter in the current measuring methods.
As shown in Figure 2, on the basis of existing measuring method, between zone plate 3 and measuring point pedestal 5, a two-dimensional position adjusting mechanism 6 is set, the relative position between zone plate 3 and the measuring point pedestal 5 can be adjusted in perpendicular to the two dimensional surface of beam direction.When measuring point pedestal 5 is subjected to displacement, can drive zone plate 3 moves, and make the luminous point c on the laser pickoff 4 move Δ y, laser pickoff 4 feeds back to two-dimensional position adjusting mechanism 6 with testing result after luminous point c moves Δ y detecting, by the relative position between two-dimensional position adjusting mechanism 6 control wave band plates 3 and the measuring point pedestal 5, luminous point c on laser pickoff 4 gets back to the center of laser pickoff 4, at this moment just can obtain the displacement Δ y1 of testee according to the displacement of two-dimensional position adjusting mechanism 6, Here it is zero-bit formula mensuration, also can be by the relative position between two-dimensional position adjusting mechanism 6 adjustment zone plates 3 and the measuring point pedestal 5, near the center of laser pickoff 4, obtain Δ y up to the laser spot c on the laser pickoff 4, at this moment displacement and the Δ y according to two-dimensional position adjusting mechanism 6 calculates jointly, just can obtain the displacement Δ y1 of testee, Here it is elementary errors formula mensuration.
In above-mentioned improved method, measuring method is from the existing deviation formula mensuration that utilizes the displacement of luminous point c on the laser pickoff 4 direct Laser Measurement receivers 4, change into and utilize laser pickoff 4 to carry out the zero-bit judgement, carry out the zero-bit formula mensuration or the elementary errors formula mensuration of bit shift compensation with the relative measuring point pedestal 5 of two-dimensional position adjusting mechanism 6 control wave band plates.
Effect of the present invention and benefit are because the luminous point c position on the laser pickoff 4 is near the center of laser pickoff 4 all the time, therefore, can reduce the diameter of vacuum pipe greatly at receiving end, also reduced simultaneously requirement to the range of receiving of laser pickoff 4, reduce the vacuum pipe diameter so just reached, reduce system cost, reduce the purpose of difficulty of construction.
Description of drawings
Fig. 1 is an existing vacuum laser dam deformation measurement method synoptic diagram.
Among the figure: 1 vacuum pipe, 2 LASER Light Source, 3 zone plates, 4 laser pickoffs, 5 measuring point pedestals, a is the LASER Light Source center, b is the position at zone plate 3 centers, Δ y1 is measuring point pedestal 5 displacements, and Δ y1 also is the distances of zone plate 4 centers to the axis of LASER Light Source 1 center and the formation of laser pickoff 4 lines of centres, and c is the position of laser beam at the laser spot center that laser pickoff 4 forms, Δ y is the distance at 4 centers from c to the laser pickoff, L is the distance of LASER Light Source 1 to laser pickoff 4, and L1 is the distance of LASER Light Source 1 to zone plate 3, and Dmax is the max vacuum pipe diameter.
Fig. 2 is a vacuum laser provided by the invention dam deformation measurement method synoptic diagram.
Among the figure: 1 vacuum pipe, 2 LASER Light Source, 3 zone plates, 4 laser pickoffs, 5 measuring point pedestals, 6 two-dimensional position adjusting mechanisms, a is the LASER Light Source center, b is the position at zone plate 3 centers, and Δ y1 is the displacement of measuring point pedestal 5, and c is the position of laser beam at the laser spot center that laser pickoff 4 forms, Δ y is the distance at 4 centers from c to the laser pickoff, L is the distance of LASER Light Source 1 to laser pickoff 4, and L1 is the distance of LASER Light Source 1 to zone plate 3, and Dmax is the max vacuum pipe diameter.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Present embodiment will carry out as directed the vacuum laser dam deformation measuring system that adopts this method front and back.
Certain vacuum laser dam deformation measuring system is before adopting this method, and system architecture as shown in Figure 1.System is made up of vacuum pipe 1, LASER Light Source 2, zone plate 3, laser pickoff 4 and measuring point pedestal 5.LASER Light Source 2 and apart 1000 meters of laser pickoffs 4, measuring point pedestal 5 is 100 meters to the distance of LASER Light Source 2, and zone plate 3 is fixed together with measuring point pedestal 5, and near the vacuum pipe diameter the Laser emission end is 159 millimeters.When the vertical laser axis of this measuring point deflection is 20 millimeters, by triangle relation, the translational movement Δ y that luminous point c can produce is 20 * 1000/100=200 millimeter, at this moment, if, at least 400 millimeters of the vacuum pipe diameters of requirement receiving end require the range of receiving of laser pickoff 4 also will reach 400 millimeters simultaneously, otherwise laser can't reach laser pickoff 4.
After adopting this method, system architecture as shown in Figure 2, at this moment, system is made up of vacuum pipe 1, LASER Light Source 2, zone plate 3, laser pickoff 4, measuring point pedestal 5 and two-dimensional position adjusting mechanism 6.LASER Light Source 2 and apart 1000 meters of laser pickoffs 4, measuring point pedestal 5 is 100 meters to the distance of LASER Light Source 2, is connected by two-dimensional position adjusting mechanism 6 between zone plate 3 and the measuring point pedestal 5, near the vacuum pipe diameter the Laser emission end is 159 millimeters.20 millimeters of the displacements of the vertical laser axis of measuring point pedestal 5 generations, drive zone plate 3 and move 20 millimeters, and to make luminous point c on the laser pickoff 4 move Δ y be 200 millimeters, adopt elementary errors formula mensuration, laser pickoff 4 feeds back to two-dimensional position adjusting mechanism 6 with testing result after luminous point c moves detecting, by the relative position between two-dimensional position adjusting mechanism 6 adjustment zone plates 3 and the measuring point pedestal 5, up to the luminous point c on the laser pickoff 4 near the center of laser pickoff 4 in about 10 millimeters, it is 10 millimeters that detection obtains Δ y, at this moment 19 millimeters of displacements and the Δ y according to two-dimensional position adjusting mechanism 6 calculates jointly, just can obtain the displacement Δ y1=19+10 * 100/1000=20 millimeter of measured point.Because may command luminous point c is in the scope of radius 10 millimeter, so near the vacuum pipe the receiving end can be identical with 159 millimeters of the vacuum pipe diameters of transmitting terminal, and the range of receiving of laser pickoff 4 only needs 50 millimeters, just can meet the demands.Thereby reduce construction costs and difficulty of construction greatly.
Claims (1)
1. vacuum laser dam deformation measurement method, this method is to realize on the vacuum laser dam deformation measuring device of being made up of vacuum pipe (1), LASER Light Source (2), zone plate (3), laser pickoff (4), measuring point pedestal (5) two-dimensional position adjusting mechanism (6), it is characterized in that:
At first move in respect to measuring point pedestal (5) perpendicular to the two dimensional surface of laser beam by two-dimensional position adjusting mechanism (6) control wave band plate (3), the position that makes the laser spot that laser pickoff (4) received is in the range of receiving of laser pickoff (4), then according to zone plate (3) with respect to the position of laser spot on laser pickoff (4) that the amount of movement and the laser pickoff (4) of measuring point pedestal (5) received, calculate the actual displacement of measuring point pedestal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105231 CN1235013C (en) | 2003-11-28 | 2003-11-28 | Vacuum laser dam deformation measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105231 CN1235013C (en) | 2003-11-28 | 2003-11-28 | Vacuum laser dam deformation measuring method |
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| CN1546942A CN1546942A (en) | 2004-11-17 |
| CN1235013C true CN1235013C (en) | 2006-01-04 |
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| CN 200310105231 Expired - Fee Related CN1235013C (en) | 2003-11-28 | 2003-11-28 | Vacuum laser dam deformation measuring method |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297798C (en) * | 2005-02-06 | 2007-01-31 | 重庆大学 | 2-D, large range laser deflection / displacement measuring method and apparatus |
| CN100390498C (en) * | 2005-12-28 | 2008-05-28 | 张奔牛 | Apparatus and method for detecting and monitoring displacement/deflection |
| CN101063610B (en) * | 2007-05-28 | 2010-09-08 | 张立品 | Automatic monitoring system for engineering project deformation |
| CN102175164B (en) * | 2011-02-24 | 2012-09-05 | 西安交通大学 | Large-range vacuum alignment laser measuring system and displacement measuring method thereof |
| CN103499336A (en) * | 2013-09-23 | 2014-01-08 | 国家电网公司 | Automatic three-dimensional displacement monitoring method for arch dam deformation |
| CN103499298B (en) * | 2013-10-18 | 2016-08-03 | 中水东北勘测设计研究有限责任公司 | A kind of laser collimation in vacuum line displacement measuring device end points absolute displacement correcting method |
| CN104296647B (en) * | 2014-10-23 | 2017-02-15 | 湖北工业大学 | Method for measuring deformation through conical line |
| CN104596405B (en) * | 2015-01-25 | 2017-06-16 | 北京工业大学 | Rain dirty pipe deforming contact real-time monitoring device and method on ground |
| CN106354066B (en) * | 2016-11-02 | 2018-10-12 | 济南大学 | A kind of Centralized Controller applied to reservoir dam monitoring system |
| CN107289856A (en) * | 2017-05-09 | 2017-10-24 | 南京理工大学 | A kind of method that pipeline dimensional orientation is measured based on cmos image sensor |
| CN109061608B (en) * | 2018-05-23 | 2021-09-28 | 顺丰科技有限公司 | Laser ranging calibration method |
| CN110319777A (en) * | 2019-07-20 | 2019-10-11 | 大连理工大学 | A kind of High Precision Long-distance surveys the multiple reflections formula measuring device and method of displacement |
| CN110360927B (en) * | 2019-07-24 | 2020-11-06 | 西南交通大学 | Device and method for quickly measuring deflection of long and large part |
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2003
- 2003-11-28 CN CN 200310105231 patent/CN1235013C/en not_active Expired - Fee Related
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