CN102192705B

CN102192705B - Non-contact type compound scanning measuring system

Info

Publication number: CN102192705B
Application number: CN2010101198558A
Authority: CN
Inventors: 刘纳平
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-08
Filing date: 2010-03-08
Publication date: 2013-11-13
Anticipated expiration: 2030-03-08
Also published as: CN102192705A

Abstract

The invention discloses a non-contact type compound scanning measuring system, which comprises a dot laser, a cylindrical lens, a double-sided reflector, a digital camera, an ocular lens and a reflector, wherein the digital camera and the ocular lens are mounted in parallel from top to bottom; the mounting center lines of the digital camera and the ocular lens are approximately superposed; light rays emitted from the dot laser are reflected to a measured object by a first surface of the double-sided reflector; and the light rays emitted from the measured object enter into the digital camera through the ocular lens after being reflected to a second surface of the double-sided reflector by the reflector. Compared with the prior art, the non-contact type compound scanning measuring system has the advantages that the structure is simple, the operation is convenient and fast and the surface of the object is free from being damaged; various non-contact measurements can be realized; and the measurement can be performed in a same coordinate system, the measured data are accurate, and the data acquired in various measuring manners can be integrated in the same coordinate system.

Description

Non-contact type compound scanning measuring system

[technical field]

The present invention relates to high-precision measuring equipment, more specifically say a kind of non-contact type compound scanning measuring system.

[background technology]

Three-dimensional precision measurement equipment commonly used is to use three coordinate measuring machine, the measurement component of its use is probe, the parts that belong to contact, the parts of this kind contact are helpless for the testee of flexible material, and the complex-curved data acquisition efficiency that has for testee is very low.

In order to solve this difficult problem, contactless measuring equipment has also appearred on market, as three-dimensional laser scanner, but the measured data precision of this equipment is not high, and this equipment also seems helpless to the border of testee.If with three coordinate measuring machine or three-dimensional laser scanner, obtain contour of object, the equipment (as the image-type measuring instrument) of recycling Measured Boundary is measured the border of object, because the instrument of repeatedly measuring not is an instrument, the D coordinates value of object being measured is difficult to unified.

, in view of above drawback, be necessary to research and develop a kind of new non-contact type compound scanning measuring system to overcome above-mentioned defect in fact.

[summary of the invention]

The purpose of this invention is to provide a kind of multiple measurement that can realize the object dimensional data, and be unified in a non-contact type compound scanning measuring system in coordinate system with the data of multiple measurement are high-precision.

To achieve these goals, the present invention adopts following technical scheme: a kind of non-contact type compound scanning measuring system, it comprises dot laser, double mirror, digital camera, eyepiece and catoptron, wherein, described digital camera and from up to down parallel installation of eyepiece, its mounting center line both roughly overlaps, the light that described dot laser sends reflexes to testee through the first surface of double mirror, and the light that testee sends enters digital camera by eyepiece through mirror reflects to the second surface of double mirror.

Preferential is that described non-contact type compound scanning measuring system is provided with switching device shifter and cylindrical lens.

Preferential is, described non-contact type compound scanning measuring system also is provided with switching device shifter and high magnification object lens, and described switching device shifter can make dot laser, cylindrical lens, double mirror and catoptron not participate in measuring.

Compared to prior art, the present invention has following advantage:

1. simple in structure, easy to operate;

2. measure in same coordinate system, multiple metering system the data obtained can be unified in a coordinate system, and measuring speed is quick;

3. the data precision of measuring gained is high.

[description of drawings]

Fig. 1 is the structural principle schematic diagram of contactless type compound scanning measuring system;

Fig. 2 is the principle schematic that the present invention is in an accurate laser measurement;

Fig. 3 is the light path isoboles that the present invention is in an accurate laser measurement;

Fig. 4 is the triangulation schematic diagram that the present invention adopts;

Fig. 5 is the principle schematic that the present invention is in the line laser high-velocity scanning;

Fig. 6 is the light path isoboles that the present invention is in the line laser high-velocity scanning;

Fig. 7 is that the present invention is in Eikonometric principle schematic.

[embodiment]

Below by specific embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.

Please refer to shown in Figure 1ly, Fig. 1 is the structural principle schematic diagram of non-contact type compound scanning measuring system.Non-contact type compound scanning measuring system 100, it comprises high magnification object lens 10, dot laser 20, cylindrical concave lens 30, double mirror 40, digital camera 50, eyepiece 60, catoptron 70 and a cover switching device shifter (not shown), and the direction that reflects after the some laser process double mirror 40 that wherein dot laser 20 produces and the optical axis of eyepiece 60 overlap.This switching device shifter, according to work requirements, switches assembly wherein, thereby reaches different duties.Following is described three kinds of duties.

Please refer to shown in Figure 2ly, Fig. 2 is that this system is in the high-accuracy surveying work state of a laser.Put the class of operation of accurate laser measurement and probe measurement seemingly, need to prove, end of probe is generally ball-type, three-dimensional data value for the Measurement accuracy object, need to face the measured surface of object, and some laser can not face the measurement surface of object without this phenomenon; But, in order to use program that probe-type measures and the habituation of operation, generally face the measured surface of object.The light path of this kind duty as shown in Figure 2, the point-like laser that dot laser 20 sends, face testee 90 after arriving double mirror 40 reflections, then through catoptron 70, arrive the another side of double mirror 40, finally by crossing eyepiece 30, arrive digital camera 50.Switching device shifter will be removed cylindrical concave lens 30 and high magnification object lens 10 this moment, in this Fig. 2 with the flight path of the line representative point laser of arrow.And digital camera 50 and eyepiece 60, by one group of double mirror 40 and catoptron 70, are mirrored to the second digital camera 50 ' in figure and the position of the second eyepiece 60 ', and its equivalent light path figure is shown in Figure 3.

, by the triangulation principle, just can accurately measure the three-dimensional data of object.The principle of triangulation is as shown in Figure 4: size L is the distance of Ear Mucosa Treated by He Ne Laser Irradiation to testee 90 surfaces, and the laser of this moment just is reflected in the center of the target surface of digital camera 50.A is laser and the second eyepiece 60, the angle of optical axis, the i.e. angle of design and installation.When testee 90 was in position L ', computation process was as follows:

The target surface center dX of the migration imagery of laser in digital camera 50, in figure, dX ' is directly proportional to dX, establishes K=dX '/dX, and namely K is magnification ratio.L '=L+dX '/sin (a)=L+K*dX/sin (a).

Fig. 5 is that this system is in the duty that the line laser high-velocity scanning is measured, i.e. 3 D laser scanning duty.The light path of its work as shown in Figure 5.The point-like laser that dot laser 20 sends, become line laser through cylindrical concave lens 30, then arrive double mirror 40, shine testee 90 after being reflected, then arrive the another side of double mirror 40 through catoptron 70, finally by crossing eyepiece 60, arrive digital camera 50.Switching device shifter will be removed high magnification object lens 10 this moment.Represent the flight path of laser in this Fig. 5 with the line of arrow.Similar to Fig. 2 is, digital camera 50 and eyepiece 60, by one group of double mirror 40 and catoptron 70, are mirrored to the 3rd digital camera 51 ' in Fig. 5 and the position of the 3rd eyepiece 61 ', and its equivalent light path figure is Fig. 6.This state has utilized the triangulation ratio juris equally, different is, point laser is by after cylindrical concave lens 30, become finishing tool, formed laser rays one on object, thereby reached the purpose of the three-dimension curved surface of high-velocity scanning testee, with respect to traditional probe-type scanning, improve greatly efficiency, and do not had the phenomenon that scratches body surface.

Fig. 7 is that this system is in the high-accuracy surveying work state of image-type.Radiographic measurement is the magnification ratio according to camera lens, carrys out the boundary profile of recognition object by artificial or computing machine, reaches the purpose of measurement.Switching device shifter will be removed double mirror 40 this moment, and laser instrument 20 is closed simultaneously.The light path of its work is as shown in Figure 7: the boundary profile of testee,, by high magnification object lens 10, arrive eyepiece 60, and arrive finally digital camera 50.Yet image-type is measured the planar profile that can only obtain object,, for elevation information, needs to obtain by automatic focus.Self-focusing principle is: when object was in focal position, its imaging was the most clear, and at this time, the difference sum of neighbor is maximum.

In order to allow coordinate system come together, we must determine Inside Parameter Value under different conditions with same calibration device.Can adopt process as described below: bidding allocates face perpendicular to Z axis, and the some laser vertical shines demarcates plane.Due in above-mentioned duty, some laser after double mirror 40, overlaps with the optical axis of camera lens, the XY coordinate in above-mentioned duty is unified, and the registration between its deviation is both, in practical application, can pass through micromatic setting, reach very high registration accuracy.What we need to proofread and correct so is: the coordinate on Z-direction is unified, the distance between the focal length the when L while namely putting laser measurement state (or line laser scanning mode) in Fig. 4 and radiographic measurement.At first, system is switched to a laser measurement state, the distance between adjustment System and correcting block, make the center of invocation point laser imaging at the target surface of digital camera.Write down coordinate figure.Then be switched to the radiographic measurement state, the distance between adjustment System and correcting block, when the dot matrix imaging on correcting block is more clear, then, according to the automatic focus principle, carry out automatic focus by program,, to reach best focal position, writes down coordinate figure; The coordinate difference between both, be compensation rate.Take under a laser measurement state as benchmark, during radiographic measurement, its elevation information will add this compensation rate, just can unify the coordinate of Z axis.

Non-contact type compound scanning measuring system of the present invention, in above-mentioned different duty,, owing to being on same measuring machine, need not the situation of multiple clamping testee, does not have multiple clamping location equal error; , because multiple measurement means combines, form an integral body simultaneously, can use same calibration device, demarcated the inner parameter of the different operating state of this system.In sum, the data of measuring under each state just can high unity in a coordinate system.Prove through many experiments, can reach micron-sized precision; Because testee need not multiple clamping, and high-velocity scanning and high-acruracy survey all select as required, improved greatly work efficiency.

The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or equivalent transformation that utilizes instructions of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.

Claims

1. non-contact type compound scanning measuring system, it comprises dot laser, double mirror, the first digital camera, the first eyepiece and catoptron, cylindrical concave lens and high magnification object lens, it is characterized in that: described the first digital camera and the from up to down parallel installation of the first eyepiece, its mounting center line both roughly overlaps, the light that described dot laser sends reflexes to testee through the first surface of double mirror, and the light that testee sends enters first digital camera by the first eyepiece through mirror reflects to the second surface of double mirror; Comprise three kinds of duties: the first, the high-accuracy surveying work state of some laser, the point-like laser that dot laser sends, face testee after arriving the double mirror reflection, then through catoptron, arrive the another side of double mirror, finally by crossing the first eyepiece, arrive the first digital camera; Switching device shifter will be removed cylindrical concave lens and high magnification object lens this moment; And the first digital camera and the first eyepiece, by one group of double mirror and catoptron, are mirrored to the position of the second digital camera and the second eyepiece; The second, the duty of line laser high-velocity scanning measurement, the point-like laser that dot laser sends, become line laser through cylindrical concave lens, then arrive double mirror, shine testee after being reflected, then arrive the another side of double mirror through catoptron, finally by crossing the first eyepiece, arrive the first digital camera; Switching device shifter will be removed the high magnification object lens this moment; The first digital camera and the first eyepiece,, by one group of double mirror and catoptron, be mirrored to the position of the 3rd digital camera and the 3rd eyepiece; Three, the high-accuracy surveying work state of image-type, radiographic measurement is the magnification ratio according to camera lens, carrys out the boundary profile of recognition object by artificial or computing machine, reaches the purpose of measurement; Switching device shifter will be removed double mirror this moment, and laser instrument is closed simultaneously; The boundary profile of testee,, by the high magnification object lens, arrive the first eyepiece, arrives finally the first digital camera; Yet image-type is measured the planar profile that can only obtain object,, for elevation information, needs to obtain by automatic focus; Self-focusing principle is: when object was in focal position, its imaging was the most clear, and at this time, the difference sum of neighbor is maximum.