The invention provides a measuring system and method of speckle interferometry and shear speckle interferometry, and relates to the technical field of optic test. The measuring system of speckle interferometry and shear speckle interferometry is characterized in that the measuring system comprises a laser device and a beam splitter, and a laser emitted by a laser device is split into transmitted light and reflected light through the beam splitter; the transmitted light is expanded through a beam expander and then emits to a to-be-tested object to form diffuse reflectance light, and the reflected light sequentially passing through an optical fiber, lens and a beam splitter prism serves as reference light to enter a light path; after the diffuse reflectance light on the surface of the to-be-tested object sequentially passes through a diaphragm, an imaging lens and a Michelson shear device, and two beams of object light with shear values are obtained; and the two beams of object light with the shear values and the reference light introduced by the optical fiber intervene on a target surface of a CCD camera, and a speckle interferometry drawing is formed. According to the measuring system of speckle interferometry and shear speckle interferometry, synchronous dynamic detection of speckle and shear can be conducted on the to-be-tested object, and lossless, full field and high precision are achieved.

Measuring system and method of speckle interferometry and shear speckle interferometry

The invention relates to an imaging system of a multifunctional speckle interference device, and discloses a camera lens of a multifunctional speckle interferometer. The multiple functions are shown in achieving a speckle interference imaging function and a shearing speckle interference imaging function. A whole optical path is sequentially provided with: ten lenses from the object side to the image side along the optical axis, wherein the ten lenses are respectively a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens; three beam splitter prisms which are respectively a first beam splitter prism, a second beam splitter prism and a third beam splitter prism; two reflecting mirrors which are respectively a reflecting mirror and a shearing reflecting mirror; a diaphragm positioned between the fourth lens and the fifth lens, wherein the third lens and the fourth lens form a cemented lens group,the seventh lens and the eighth lens form a cemented lens group, and the ninth lens and the tenth lens form a cemented lens group. According to the invention, imaging of an object plane to be measuredis achieved, and the beam splitter prisms are added to perform interference processing on speckles, so that a speckle interference pattern is obtained.

Imaging system of multifunctional speckle interference device

The invention provides a speckle interference-based synchronous deformation and strain measurement system and method, and relates to the technical field of optical test. The system is characterized bycomprising a laser and a beam splitter; the laser light emitted by the laser is divided into transmitted light and reflected light by the beam splitter; the transmitted light is expanded by the beamexpander and then irradiated to a measured object to form diffuse reflected light; the reflected light passes through an optical fiber and a beam splitter prism in sequence to enter an optical path asreference light; the diffuse reflected light passes through a diaphragm, an imaging lens, the beam splitter prism and a Michelson shearing device in sequence to obtain two beams of object light having shear amounts; the reference light introduced by the optical fiber passes through the Michelson shearing device to obtain two beams of reference light having shear amounts; the two beams of object light having the shear amounts and two beams of reference light having the shear amounts interfere each other on the target surface of a CCD camera so as to form a speckle interference diagram. The system can perform synchronous dynamic detection of speckle and shear on the tested objects, and is a non-destructive, full-field and high-precision measurement system.

Speckle interference-based synchronous deformation and strain measurement system and method

The invention discloses a roadway lamp for coal mine mining, and relates to the technical field of roadway lamps. The roadway lamp comprises a roadway lamp body, and further comprises an installationplate, and the lower surface of the roadway lamp body is hinged to one surface of the installation plate through a first hinge seat; a first support lug plate is fixed to the upper surface of the roadway lamp body; a first rectangular groove port is formed in one surface of the installation plate; a long bolt is slidably matched with the first rectangular groove port relative to the inner wall; one end of the long bolt penetrates through a long hole of the first support lug plate and is connected with a first adjusting nut in a threading mode; a pair of L-shaped supporting plates are symmetrically fixed to one surface of the installation plate; and a double-sided convex mirror assembly is rotatably matched between the two L-shaped supporting plates. According to the roadway lamp, the angleof the roadway lamp can be adjusted to meet the needs of roadways with different heights through the roadway lamp body, the installation plate and the double-sided convex mirror assembly, double mirror reflection is adopted to make the light in the roadway uniform, walkingand observation in the roadway is convenient, and the problem of unreasonable distribution of the light of an existing roadwaylamp is solved.

Roadway lamp for coal mine mining

The invention discloses a point diffraction interference device and method for object vibration measurement. The device comprises a light source, a light path processing module and a measuring module,wherein the light source emits initial light to the light path processing module; the light path processing module converts the initial light into a plurality of beams of emergent light to be mergedinto the measuring module; and the measuring module is connected to a measured object for collecting and processing an interference pattern generated by the incident light. Laser emitted by a single-longitudinal-mode laser enters the measuring module through the light path processing module, and the incident light is interfered after the incident light passes through a polarizing film array arranged in front of a polar digital camera; a four-step phase-shifting interference pattern and an interference pattern of each transient position are recorded; and spatial three-dimensional coordinate values of different transient positions are analyzed according to the interference pattern, and an object vibration process is measured. According to the device and the method, the measured object and ameasuring probe are fixed, and the interference pattern of each transient position in the vibration process is collected by the polar digital camera, the spatial three-dimensional coordinates of eachtransient position are analyzed, the object vibration is measured, and the anti-interference capability of the device is improved.

Point diffraction interference device and method for object vibration measurement

The embodiment of the invention discloses a sharing device of speckle interferometry and shearing speckle interferometry, which is characterized by comprising a speckle interference optical path, a shearing speckle interference optical path, and an optical path switching module, wherein the optical path switching module is used for the switching of the speckle interference optical path and the shearing speckle interference optical path. The embodiment of the sharing device of speckle interferometry and shearing speckle interferometry can realize the switching of a speckle interferometry optical path and a shearing speckle interferometry optical path in one measuring device through the optical path switching module, so that the problem of cumbersome operation caused by switching different measuring devices is effectively reduced.

Sharing device of speckle interferometry and shearing speckle interferometry

The embodiment of the invention discloses a strain measurement method and a strain measurement device. The method comprises the following steps: establishing a three-dimensional shearing speckle interference optical path based on a spatial carrier; according to the three-dimensional shearing speckle interference optical path, synchronously determining multiple displacement spatial gradients of a measured object; according to the multiple displacement spatial gradients, synchronously determining multi-dimensional strain of the measured object. The method and the device provided by the embodiment of the invention can effectively realize synchronous measurement of the multi-dimensional strain in a dynamic deformation process.

Strain measurement method and strain measurement device

The invention discloses a polarization four-step phase shifting method for digital speckle interferometry. According to the polarization four-step phase shifting method for digital speckle interferometry, polarization beam splitting prisms, a beam expander, quarter wave plates and polarizers are adopted to establish a polarization four-step phase shifting optical path; in a phase shifting process,two polarizers are rotated, so that 0-degree, 90-degree, 180-degree and 270-degree four-step phase shifting can be realized, and corresponding speckle images are acquired; and a random phase field atan initial moment is restored through a four-step phase shifting algorithm. Compared with a traditional time phase shifting method, the method replaces piezoelectric ceramics with two rotatable polarizers, and therefore, the hysteresis, nonlinearity and creep interference of the piezoelectric ceramics can be avoided, stable speckle images can be acquired, and accurate random phase extraction canbe realized.

Polarization four-step phase shifting method for digital speckle interferometry

Theembodiment of the invention provides a uniform light tube illuminating device for a digital speckle interference system. The uniform light tube illuminating device comprises a first convex lens, auniform light tube, an aspherical mirror and a second convex lens, the first convex lens and the second convex lens are both double-convex lenses, and the two ends of the aspherical mirror are respectively a convex surface and a flat surface, along the irradiation direction of the light beam, the first convex lens, the uniform light tube, the aspherical mirror and the second convex lens are sequentially arranged, wherein the first convex lens and the aspherical mirror are respectively connected to the two ends of the uniform light tube, the convex surface on the aspherical mirror faces towardsthe coming direction of the light beam, and the incident focal point of the second convex lens coincides with the refraction focal point of the aspherical mirror. According to the invention, the first convex lens, the uniform light tube, the aspherical mirror and the second convex lens are arranged, so that the laser is prevented from being lost when passing through all parts, and then the laseris irradiated to the object to be measured to form a uniform light spot energy field., so that a clearer image of the interference fringes is obtained, and the accuracy of the digital speckle interference technology on object detection is improved.

Uniform light tube illuminating device for digital speckle interference system

Embodiments of the invention disclose a method and a device for measuring a strain based on an absolute phase. The method comprises the following steps: constructing a shearing speckle interference optical path based on a spatial carrier, the shearing speckle interference optical path comprises four lasers with different wavelengths; synchronously determining a plurality of absolute phase values after the deformation of a tested object according to the shearing speckle interference optical path; synchronously determining a plurality of displacement and spatial gradients of the tested object according to the plurality of absolute phase values; and synchronously determining a multi-dimensional strain quantity of the tested object according to the plurality of displacement and spatial gradients. According to the method and the device for measuring the strain based on the absolute phase, the strain condition of the object can be truly reflected according to the strain quantity obtained bythe absolute phase.

Li Weixian

Papers

Sharing device of speckle interferometry and shearing speckle interferometry

Strain measurement method and strain measurement device

Polarization four-step phase shifting method for digital speckle interferometry

Uniform light tube illuminating device for digital speckle interference system

Method and device for measuring strain based on absolute phase