CN201885837U

CN201885837U - Micro-stress detecting device

Info

Publication number: CN201885837U
Application number: CN2010206028012U
Authority: CN
Inventors: 钟聪; 石念宝
Original assignee: XI'AN BEIFANG JIERUI OPTOELECTRONICS TECHNOLOGY Co Ltd
Current assignee: XI'AN BEIFANG JIERUI OPTOELECTRONICS TECHNOLOGY Co Ltd
Priority date: 2010-11-11
Filing date: 2010-11-11
Publication date: 2011-06-29
Anticipated expiration: 2020-11-11

Abstract

The utility model provides a micro-stress detecting device, which comprises a linear polarization laser, an aperture stop, a displacement bench, a 1/4 slide, an analyzer, a photoelectric receiver and a digital display system. The aperture stop, the 1/4 slide and the analyzer are positioned on an optical axis of linear polarized light emitted by the linear polarization laser, and the analyzer is sequentially connected with the photoelectric receiver and the digital display system. The high-stability linear polarized light is generated by the linear polarization laser, precision of an integral test is guaranteed, the aperture stop can be used for flexibly adjusting the radius of a light beam and detecting local micro-stress of a sample, the three-axis displacement bench can realize vertical and bilateral movement of the sample, and consequentially stress detection at different positions of the sample is realized.

Description

A kind of faint stress detection device

[technical field]

The utility model relates to the detection technique field, particularly a kind of faint stress detection device.

[background technology]

At present, known optical exemplar stress detects and generally to adopt projection polariscope, or projection polariscope adds camera and carries out stress analysis.Projection polariscope generally adopts white light source, and the different colours of using chromatic polarization principle observation exemplar is distinguished the size of stress.Because the value of chromatic polarization method color is an approximate value, so the sizes values of stress also is an approximate value.Simultaneously, the optical mirror slip that projection polariscope adopts is more, and the influence that the aberration of elimination system itself brings is difficulty relatively.In addition, the volume of projection polariscope total system is bigger, moves and carries inconvenience, to the detection and localization underaction of exemplar.

[utility model content]

The purpose of this utility model provides a kind of faint stress detection device, solves the problems of the technologies described above.

To achieve these goals, the utility model adopts following technical scheme:

A kind of faint stress detection device comprises: linearly polarized laser device, aperture diaphragm, displacement platform, 1/4 slide, analyzer, photelectric receiver and digital display system; Described aperture diaphragm, 1/4 slide, analyzer are positioned on the optical axis of the linearly polarized light that the linearly polarized laser device sends, and described analyzer connects described photelectric receiver and digital display system successively.

Compared with prior art, the utlity model has following advantage:

1, the linearly polarized laser device produces high stability linearly polarized light, guarantees the precision of whole test;

2, aperture diaphragm can be adjusted beam radius flexibly, can detect the local trickle stress of sample;

3, the three-shaft displacement platform can make about the sample, move left and right, the stress that carries out the sample different parts detects.

[description of drawings]

Fig. 1 is a structure principle chart of the present utility model.

Wherein: 1 is the linearly polarized laser device; 2 is aperture diaphragm; 3 is sample; 4 are the displacement platform; 5 is 1/4 slide; 6 is analyzer; 7 is photelectric receiver; 8 is digital display system.

[embodiment]

Below in conjunction with accompanying drawing the utility model is done and to be described in further detail.

See also shown in Figure 1ly, linearly polarized laser device 1 produces high stability linearly polarized light, guarantees the precision of whole test; Aperture diaphragm 2 can be adjusted beam radius flexibly, so that the trickle stress in part is detected; Three-shaft displacement platform 4 can make sample about in the of 3, move left and right, and the stress that carries out sample 3 different parts detects; The elliptically polarized light that 1/4 slide 5 causes stress is converted into linearly polarized light once more, but the polarization direction can rotate a certain angle; The analyzing direction of analyzer 6 is vertical with the polarization direction of lasing light emitter, if institute's test sample product are unstressed, directly obtains the minimum intensity of light value; If there is stress in sample, certain angle need be revolved and the light intensity minimum value could be obtained, the angle of revolving can characterize the size of stress; Photodetection system 7 can write down the angle that revolved the polarization direction, after digital readout system 8 is handled angle value, the survey stress value can be shown.

The utility model adopts the LASER Light Source (can add the polarizer) of altitude line polarization, makes laser see through test sample.Because the stress birefrin effect, linearly polarized light will become elliptically polarized light, and elliptically polarized light is converted into linearly polarized light once more through 1/4 slide.At this moment, the polarization direction of linearly polarized light and the polarization direction of former polarized light with shape at an angle, the size of the size of angle reflection sample stress.The back level is connected with Photodetection system by an analyzer, the initial polarization direction of analyzer is vertical mutually with the polarization direction of lasing light emitter, analyzer can rotate automatically, rotary course can be with the light intensity minimum value by Photodetection system, reach the corresponding anglec of rotation and carry out record, the calculating by digital display circuit can directly show stress value at last again.If adopting the light of 632.8nm wavelength is the linear polarization light source, detection accuracy with detector is 0.1 ° of calculating, the sensitivity of test light path is 0.3nm, surpass the previous magnitude of order, and behind the laser instrument port adding aperture diaphragm, can also pass through the size of the size detection local stress of control bundle.Thereby, reach the purpose of quick and accurate assignment test stress.

Claims

1. a faint stress detection device is characterized in that, comprising: linearly polarized laser device (1), aperture diaphragm (2), displacement platform (4), 1/4 slide (5), analyzer (6), photelectric receiver (7) and digital display system (8); Described aperture diaphragm (2), 1/4 slide (5), analyzer (6) are positioned on the same optical axis, and described analyzer (6) connects described photelectric receiver (7) and digital display system (8) successively.