CN201476764U - Movable type interferometer moire interferometer - Google Patents

Abstract

The utility model relates to a movable type moire interferometer, which comprises a laser, a reflector, a beam expanding lens, a collimating lens, a U-V field separating device and an image capture device. The movable type moire interferometer comprises a major light path movable platform and an image capture movable platform. The U-V field separating device has a function of rotating for plus or minus 90 degrees, thereby solving the problem of the displacement field measurement in the non-vertical and non-horizontal directions of the orthogonal grating of the measured piece. Meanwhile, the utility model has the advantages of compact structure, convenient movement, and with the good vibration damping performance and the high-power laser, the utility model can be used together with the large testing machine, and can satisfy the requirements of the high-temperature mechanical test and on-site field measurement.

Description

A kind of mobile moire interferometer

Technical field

The utility model relates to a kind of mechanical testing instrument, relates in particular to a kind of mobile moire interferometer.

Background technology

In mechanical test, with the variation of moir measurement plane intrinsic displacement field, used very extensively at home and abroad, successfully solved many practical problemss.But original measuring method and equipment are the bulk structure of setting up on the vibration-isolating platform of laboratory mostly, and the shockproof function of its platform etc. can obtain better guarantees.But owing to be not easy to move, supporting uses such as inconvenience and large-scale experiment machine also are difficult to solve the engineering site problem.In recent years, some laser surveying instrument that can move or systems have been released both at home and abroad, as China Patent No.: 200410000005.0,200510027941.5,200510025444.1 the system or equipment that provides, they can solve some practical problemss, but also there are some limitation, as these systems or instrument mostly is only to measure at the level of perpendicular internal fixation or plummet direction displacement field (U-V field) or the displacement field that increases by 45 ° of angles carries out mechanical meaurement, but can't finish the measurement of general orientation shear crack displacement field, the instrument Stimulated Light source power restriction that also has is difficult to finish the mechanical meaurement under the big light field hot environment.

Summary of the invention

The purpose of this utility model provides a kind of good vibration isolation that has, can measure the displacement field of any both direction in isoplanar, and can carry out mechanical test under the big light field hot environment, and compact conformation, conveniently moving, the mobile moire interferometer that engineering site is used met.

The utility model is achieved through the following technical solutions.

This mobile moire interferometer, comprise that laser instrument, light path catoptron, beam expanding lens, collimation lens, U-V field tripping device, image collecting device, its special character are that this interferometer is made of main optical path mobile platform and image acquisition mobile platform two parts, above-mentioned each device or parts are installed in respectively on these two platforms; On described main optical path mobile platform has, understructure, the upper strata is the vibration insulation that the vibration isolation function is arranged, end is covered with optical path adjustment device above it, lay beam expanding lens and aspheric surface collimation lens on this device successively, the other end is laid U-V field tripping device on the vibration insulation of collimation lens back, lower floor is that laser instrument is laid layer, can lay various power, polytype laser instrument, can satisfy big light field, mechanical test under the hot environment, between the beam expanding lens on the laser instrument luminous end of main optical path mobile platform lower floor and upper strata, a pair of light path steering reflection mirror is installed, and it redirect to the laser that laser instrument sends on the beam expanding lens on upper strata from main optical path mobile platform lower floor; Described image acquisition mobile platform is covered with the imaging adjusting gear on its table top, lay on this adjusting gear image forming device with its image collecting device that axially links to each other.

The U-V field tripping device of this mobile moire interferometer, constitute by base and rotating disc two parts, base is placed on the vibration insulation of main optical path mobile platform by adjusting the magnetic optical bench, four uniform light wells are arranged on the rotating disc, and be equipped with and light well four pairs of light field catoptrons one to one, can form two pairs of experiment incident fields, be respectively applied for the test of U field and V field, imaging mirror is equipped with at the rotating disc center, rotating disc has around its center the spinfunction with respect to base ± 90 °, so can test the displacement field of any two orthogonal directionss of perpendicular, indeterminable orthogonal grating is non-vertically in the past to solve measured piece, the displacement field test problem of non-horizontal direction.

This mobile moire interferometer, the imaging mirror on its U-V field tripping device be not with rotating disc rotation, its direction scalable.

The main optical path adjusting gear of this mobile moire interferometer and imaging adjusting gear can be made up of the multiple degrees of freedom adjustment magnetic optical bench of adjusting guide rail and be placed on the guide rail.

The imaging lens of the image forming device of this mobile moire interferometer can be selected specialty plate-making imaging lens for use, to be reduced to the measuring error that image distortion brings; Image collecting device can be selected video camera or camera for use.

The utility model is compared with prior art, because the instrument of fixed U-V field tripping device generally can only be to level, vertically both direction carries out the displacement field measurement, and the instrument of band rotation U-V of the present utility model field tripping device can be measured the displacement field of any two orthogonal directionss in the perpendicular, thereby expanded the instrument application scope, while the utility model apparatus structure compactness, conveniently moving, particularly high power light source can be installed, can satisfy the measurement of big light field under room temperature to the 1200 ℃ hot environment, can utilize the large-scale experiment machine to carry out tension and compression, experiment test such as creep and fatigue, can also realize the engineering survey under the site environment, utilize the utility model instrument to test the high-temperature elastic modulus of more than 60 kind of aeronautical material, parameters such as pine and cypress ratio and fracture toughness are used reliable.

Description of drawings

Fig. 1 is a structural principle vertical view of the present utility model

Fig. 2 is the utility model main optical path mobile platform structural representation

Fig. 3 is the utility model U-V field tripping device synoptic diagram when rotation β angle

Fig. 4 is a three point bending specimen forces testing synoptic diagram

Fig. 5 is a compact tension specimen forces testing synoptic diagram

Fig. 6 is an I/II Mixed Mode Crack test specimen forces testing synoptic diagram

Embodiment

The utility model is described in further detail in conjunction with above-mentioned accompanying drawing below by embodiment.

See also Fig. 1, Fig. 2, the utility model is made up of main optical path mobile platform 1 and image acquisition mobile platform 2 two parts.

1 fen upper and lower layer structure of described main optical path mobile platform, lower floor is that laser instrument is laid layer 11, lays laser instrument 3, this example is selected 1.5 meters long helium-neon lasers for use; The upper strata is the vibration insulation 12 that is covered with vibration isolator, left end above the vibration insulation 12 is covered with optical path adjustment device 13, it adjusts guide rail 14 by light path and multiple degrees of freedom adjustment magnetic optical bench 15,16 is formed, and beam expanding lens 5 and aspheric surface collimation lens 6 are placed on the adjustment guide rail 14 by adjusting magnetic optical bench 15,16 successively; At vibration insulation 12 right-hand members, U-V field tripping device 7 is arranged, it is placed on the vibration insulation 12 of aspheric surface collimation lens 6 back by adjusting magnetic optical bench 17; Between the luminous end of laser instrument 3 and the beam expanding lens 5, lay a pair of light path steering reflection mirror 4, it turns to the lower floor of laser instrument 3 emitted laser from main optical path mobile platform 1 on the beam expanding lens 5 that reflexes to the upper strata.

Described image acquisition mobile platform 2 is covered with imaging adjusting gear 21 on the table top, its structure, and principle and optical path adjustment device 13 are roughly the same also formed (not shown) by adjusting guide rail and multiple degrees of freedom adjustment magnetic optical bench.On imaging adjusting gear 21, lay image forming device 8 with its image collecting device that axially is connected 9, the imaging lens 81 of image forming device 8 is that imaging lens is used in specialty plate-making, and it is compared with common imaging lens, can be reduced to the measuring error that image distortion brings; Image collecting device 9 is selected camera for use, can improve image resolution ratio.

U-V field tripping device 7 (consulting Fig. 1, Fig. 2, Fig. 3) on the main optical path mobile platform 1, it comprises base 71 and rotating disc 72 two parts.Base 71 is placed on the vibration insulation 12 of main optical path mobile platform 1 by adjusting magnetic optical bench 17, rotating disc 72 is installed in the outer ring on base 71 tops, and cooperate with small handwheel 711 on being fixed on limit, base 71 outer ring by the external tooth of rotating disc 72 peripheries, can make rotating disc 72 around the center, outer ring of base 71 rotation unspecified angle.Have four light wells 721 that symmetry is uniform on the rotating disc 72,45 ° of stationary mirrors 75 of four symmetries are equipped with in its central authorities from the axial region position, corresponding one by one with light well 721, simultaneously at rotating disc 72 peripheries, by four catoptron brace summers 74 four adjustable incidence reflection mirrors 73 are installed, form two pairs of experiment incident fields with stationary mirror 75 is corresponding one by one, and, select arbitrary a pair of incident field to measured piece 10 by machinery resistance shelves; Direction at the corresponding measured piece 10 in the centre of rotating disc 72, imaging mirror 76 is installed, on the imaging lens 81 of the imaging device 8 of the wavefront moire interference streak reflexs that it can form measured piece 10 surface to the image acquisition mobile platform 2, to realize image acquisition.

The course of work and the principle of the moire interferometer of present embodiment are as follows: during use, adjust the mutual alignment of main optical path mobile platform 1 and image acquisition mobile platform 2 and measured piece 10 earlier, (referring to Fig. 1), make two pairs of incident optical energy symmetries of U-V field tripping device 7 separation of main optical path mobile platform 1 be incident to measured piece 10 surfaces, form the wavefront interference fringe, simultaneously, this interference fringe can reflex on the imaging lens 81 on the image acquisition mobile platform by imaging mirror 76, by adjusting image acquisition adjusting gear 21 and imaging device 8, on camera (image collecting device) 9, get a distinct image, fix two mobile platforms then.Instrument is when work, reflex on the beam expanding lens 5 by one group of light path switchable mirrors 4 by laser instrument 3 emitted laser, expand bundle by the beam expander through adjusting 5 and form parallel light field with aspheric surface collimation lens 6, pass through the light well 721 of the rotating disc 72 of U-V field tripping device 7 again, be injected on stationary mirror 75 and the incident light catoptron 73, cooperate two pairs of incident light light fields of formation through four stationary mirrors 75 and four corresponding incident light catoptrons 73, simultaneously by adjusting the rotating disc 72 of U-V field tripping device 7, can use wherein arbitrary to light field according to vertically, horizontal direction or non-vertical, non-any angle of horizontal direction deflection reflexes on measured piece 10 surfaces, orthogonal grating by measured piece 10 surfaces forms the wavefront interference fringe, imaging mirror 76 reflexes to imaging lens 81 on the image acquisition mobile platform 2 with interference fringe, is that camera is finished the image information collection and exported Computer Processing to by image collecting device 9 subsequently.

The moire interferometer of present embodiment, can carry out stand under load deformation measurement under normal temperature or the high temperature to the measured piece under polytype and the environment 10, and then obtain corresponding material property parameter or carry out mechanics of materials behavioral study, as: use the rectangle tensile test specimen can measure the elastic modulus and the Poisson ratio of different temperatures, can observe the germinating and the expansion of high-temerature creep, fatigue at high temperature crackle, use three point bending specimen 10 ', compact tension specimen 10 "; wait I type crack fracture toughness test test specimen (referring to Fig. 4, Fig. 5; P is an application of force direction), measure the fracture toughness of different temperatures; Particularly cut test specimen 10 to using compactness to draw " (referring to Fig. 6; P is an application of force direction) carries out that the I/II Mixed Mode Crack is normal, fracture behaviour research under the high temperature; and existing moire interferometer is difficult to measure; present embodiment is by U-V field tripping device 7 (referring to Fig. 3); follow the tracks of test specimen orthogonal grating (referring to Fig. 6), can reach the measurement purpose thereby rotate the β angle synchronously.

Claims (6)

1. a mobile moire interferometer comprises laser instrument, light path catoptron, beam expanding lens, collimation lens, U-V field tripping device, and image collecting device is characterized in that:

This moire interferometer is made up of main optical path mobile platform (1) and image acquisition mobile platform (2) two parts; Described main optical path mobile platform (1), on having, understructure, the upper strata is the vibration insulation (12) with vibration isolation function, end is covered with optical path adjustment device (13) above it, lay beam expanding lens (5) and aspheric surface collimation lens (6) on the adjusting gear (13) successively, at other end aspheric surface collimation lens (6) afterwards, lay U-V field tripping device (7), lower floor is that laser instrument is laid layer (11), can lay various power, polytype laser instrument (3), between lower floor's laser instrument (3) luminous end and upper strata beam expanding lens (5), lay a pair of light path steering reflection mirror (4); Described image acquisition mobile platform (2) is covered with imaging adjusting gear (21) above, lays image forming device (8) and image collecting device (9) on the adjusting gear (21) successively.

2. moire interferometer according to claim 1 is characterized in that U-V field tripping device (7) is for making the light field tripping device of ± 90 ° of rotations around its center.

3. moire interferometer according to claim 1 and 2 is characterized in that on the U-V field tripping device (7) imaging mirror (76) being installed.

4. moire interferometer according to claim 1 is characterized in that guide rail (14) and multiple degrees of freedom are adjusted magnetic optical bench (15) to optical path adjustment device (13), (16) are formed by adjusting.

5. moire interferometer according to claim 1 is characterized in that imaging adjusting gear (21) adjusts the magnetic optical bench and form by adjusting guide rail and multiple degrees of freedom.

6. moire interferometer according to claim 1, the imaging lens (81) that it is characterized in that image forming device (8) are specialty plate-making imaging lens, and image collecting device (9) is selected video camera or camera for use.

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