47 results about "Light bullet" patented technology

The invention relates to a method for testing mechanical property of a material under the action of stress wave, in particular to a method and a device for measuring dynamic fracture property of a laser shock loading material. The method comprises the following steps of: loading a three-point bent sample (4) with preformed crackles (1) by using shock wave induced by nanosecond-scale laser pulse (8), and detecting the propagation property of the stress wave (17) in the three-point bent sample (4) and the expansion property of the crackles by adopting a method of combining photo-elasticity and moire. The device acquires a high-speed transient photo-elastic image of interaction of the material and the stress wave under the condition of a high loading rate by using a multi-spark camera optical system (13), can clearly observe the propagation of the laser-induced short pulse stress wave (17), and can accurately and reliably acquire the fracture property of the material by processing.

A measuring system for measuring the dichroism of the magneto-optical circular polarization with adjustable measuring geometry is provided, whose structure is that: a femtosecond laser excites the white light of the ultra-continuous spectrum, and divides the light by a monochrometer, which forms a monochromatic light whose wavelength can be adjustable. The monochromatic light can polarize through a purified Glan-Taylor prism with the extinction coefficient of 10 <5>; a lantern fly modulator, whose optical axis is 45degree angled with the optical axis of the Glan-Taylor prism to make the light become the circularly polarized light with the alternative variation of the sinistrality and the dextrorotation; a sample, which is put on the center of the cryogenic magnet; The circularly polarized light focuses on the sample, and the reflex reflected from the sample is focuses on the first LED detector; a phase-locking amplifier, whose reference signal is provided by the lantern fly modulator used for testing the difference of light intensity between the sinistrality and the dextrorotation of the circularly polarized light. The invention can not only test the frequency spectrum of the dichroism of the magneto-optical circular polarization of the materials, magnetic density and temperature dependence, but also can test the magnetocrystalline anisotropy of the magnetic semiconductor.

The invention discloses a photoelastic high-speed Mueller matrix ellipsometer and an in-situ calibration and measurement method thereof, and belongs to the technical field of optical measurement. Thephotoelastic high-speed Mueller matrix ellipsometer comprises a high-speed polarization module, a sample adjustment module and a real-time polarization analysis module. The in-situ calibration methodof the photoelastic high-speed Mueller matrix ellipsometer is implemented based on Bessel function infinite series expansion and discrete Fourier transform, the peak value and the static retardation of the photoelastic modulator are obtained at the same time, and high precision and high sensitivity of the photoelastic modulator in the whole working range are ensured. The measurement method of thephotoelastic high-speed Mueller matrix ellipsometer is carried out on the basis of double photoelastic modulation and spatial light splitting demodulation, and in-situ and high-precision measurement of the sample Mueller matrix can be realized under microsecond time resolution. Benefited from the high temporal resolution acquisition of the Mueller matrix, the method can be used for characterizingthe dynamic optical properties of the material in the rapid reaction process.

A light gun includes a trigger unit; a grip coupled to the trigger apparatus; and a barrel unit coupled with the trigger apparatus. The trigger unit has a trigger and a hammer, and the barrel unit includes a light emitting unit which emits a light bullet in response to generation of an impact by the hammer when a trigger operation is carried out by pulling the trigger.

The invention relates to light bullet-proof glass without splashed fragments, and the light bullet-proof glass is successively composed of glass, a film, glass, a film, a thermoplastic resin sheet material, a film and a thermoplastic resin sheet material. The bullet-proof glass has the thickness of 18-24 mm, the light transmittance of 85%-90%, good flame resistance and good heat-insulation sound-insulation performances, is capable of resisting the impact of three continuous bullets emitted from a position with a distance of 10 m by a 79 type 7.62mm submachine gun, has high explosion-proof performance, and is capable of effectively preventing bullets from passing through the glass and preventing secondary damage to human body.

The invention relates to the technical field of material nondestructive testing, and provides a glass curtain wall stress detection method which mainly utilizes an air flying device to carry a pixel polarization camera to carry out block-by-block scanning on the outer side of the target area of a to-be-detected glass curtain wall, and obtains polarization images of the to-be-detected glass curtain wall in four directions at the same time; a circular polarization light source is mounted on the inner side of the target area; and the data processing device receives the transmission method photoelastic fringe image sent by the air flight device, processes the transmission method photoelastic fringe image to obtain a DoLP field distribution image and an AOP field distribution image of the target area, and calculates the stress value of the glass curtain wall of the target area according to the DoLP and the AOP. According to the method, the residual stress field in the target detection area can be obtained only through one-time photographing, and the detection efficiency is improved; the detection sensitivity is improved, the ambient light interference resistance of the system is enhanced, and the problem that photoelastic stripe images are poor in contrast in the daytime and can only be detected at night is solved.

The invention discloses a stress measurement method. The method comprises the following steps of (1) arranging a sample main body made of a single photoelastic material and a coating structure thereof; (2) arranging a stress measurement light path device; (3) starting a light source, through an arranged light path, refracting a speckle coating for multiple times and then enabling the light to coaxially enter an image acquisition unit with a reflection photoelastic pattern; (4) starting an image acquisition device, and obtaining a speckle image and a photoelastic image at the same moment at thetwo sides of the sample; and (5) jointly solving the related experiment results of a photoelastic experiment and a digital image to obtain a stress component of any pixel point of the image. The invention further discloses the stress measurement light path device for implementing the method. According to the present invention, a photoelastic method and a digital image correlation method are simultaneously carried out at the two sides of the sample to obtain the stress difference and the strain value of the whole field of the sample, so that the methods can be used for the sample with asymmetric loads, and the measurement applicability is greatly enhanced.

The invention provides a synchronous experiment system and method capable of synchronously utilizing a dynamic photoelastic method, a strain gauge electrical measurement method and a digital image correlation (DIC) method. The system comprises a flash lamp source A (1), a flash light source B (2), capacitor charger (3), polarizer A (4), a quarter-wave plate A (5), a quarter-wave plate B (6), polarizer B (7), a convex lens (8), an ultra-high-speed camera (9), an experiment loading table (10), a drop hammer (11), an impact head (12), a delay signal controller (13), strain gauges (14-15), a super-dynamic strain gauge (16), a data acquisition instrument (17), a data processing center (18), bridge boxes (19-20), ground (21), shielded wires (22-23), signal lines (24-35), a test piece (36) and aspeckle (37). According to the system, the dynamic photoelastic method, the electrical measurement method and the digital image correlation method (DIC) are effectively combined together, the dynamicfracture mechanical property of the rock material can be analyzed more comprehensively from multiple angles, multiple mechanical parameters such as a stress-strain field of crack initiation and a stress field and a displacement field of a crack tip are analyzed, and the dynamic failure rule of the rock material is summarized.

The invention discloses a photoelasticity test system and method based on an optical amplification technology, and the system comprises: a laser output unit which is used for providing a light source needed by a field of view, and a first lens group, a photoelasticity test unit, a second lens group and an image collection unit which are sequentially arranged from front to back in the direction of a light path outputted by the laser output unit. The first lens group is used for collimating and expanding a laser light source; the photoelasticity test unit is used for realizing a photoelasticity light path to obtain equal-difference stripes and comprises a polarizer, a first lambda/4 wave plate, a loading unit, a second lambda/4 wave plate and an analyzer which are arranged in sequence; the second lens group is used for amplifying the image; and the image acquisition unit is used for shooting a photoelastic image. According to the invention, the fringes are distinguished by using an optical amplification principle, and the problem that fine fringes appearing at a higher stress position of a photoelastic material with a low material fringe value during a laser photoelastic test cannot be distinguished can be solved by adjusting the configuration of the second concave lens and the second convex lens.

The invention provides a device and method for detecting anisotropies of rocks by a light reflection difference method. The device comprises a device light path, a sample bearing device, a signal amplification device, and a data acquisition and processing system, wherein the device light path comprises an incident light path and an emergent light path; the incident light path comprises a laser device, a polarizer, a photoelastic modulator, a phase shifter and a focusing device; the emergent light path comprises a polarization analyzer and a photoelectric signal converter; and the photoelectric signal converter is a photoelectric diode and the signal amplification device is a lock phase amplifier. The device provided by the invention is simple in structure and easy to operate; and the signal-to-noise ratio is greatly improved, and the anisotropies of the rocks can be rapidly and accurately measured.

The invention provides a device for detecting oil content of an oil shale by using a light reflection difference method. The device comprises an incident light path, a displacement platform, a sample cell, an emergent light path, a signal amplification device, a data acquiring and processing system and a base, wherein the incident light path comprises a laser, a polarizer, a photoelastic modulator and a phase switcher; the sample cell is fixed on the displacement platform; the emergent light path comprises a polarization analyzer, a diaphragm and an electro-optical signal converter; the laser, the polarizer, the photoelastic modulator, the phase switcher, the displacement platform, the polarization analyzer, the diaphragm, the electro-optical signal converter, the signal amplification device and the data acquiring and processing system are fixed on the base placed horizontally; the electro-optical signal converter is a photodiode; and the signal amplification device is a phase-locking amplifier. The device is simple in structure and easy to operate; signal-to-noise ratio is increased greatly; and the oil content of the oil shale can be measured quickly and accurately.

The invention discloses a glass photoelastic constant measuring device and method, and belongs to the technical field of glass photoelastic constant measurement. The device comprises a lightproof shell and a computer; a pressure loading system for providing pressure in the vertical direction, a light source, a light path modulation system and a phase difference acquisition camera are arranged in the lightproof shell, and the pressure loading system and the phase difference acquisition camera are in data connection with the computer; the light source and the phase difference acquisition camera are respectively arranged on two sides of the pressure loading system, and the light path modulation system is arranged between the light source and the pressure loading system; the pressure loading system comprises a workbench and a sliding block located above the workbench, and the workbench and the sliding block are each provided with a buffer gasket used for making contact with the lower surface and the upper surface of a glass sample. The photoelastic constant of a glass sample with the thickness of 1.1 mm or above can be effectively measured, the problem that sheet glass cannot be detected in the past is solved, measurement is rapid, and the precision is high.

The invention relates to a silicon optical accelerometer based on an MZI (Mach Zehnder Interference) system, light is incident from an input end, when an inertia force is applied, a mass block supported by a cantilever beam also displaces, the mass block pushes a measurement waveguide to generate strain, and due to a photoelastic effect and a strain effect, the transmission phase of the light in the measurement waveguide shifts with the movement of the mass. The light of the fixed waveguide and the measurement waveguide generates MZI interference in front of the output end, and the light intensity of the output end is measured to achieve the purpose of extracting the measured acceleration signal. The optical accelerometer has the advantages of high sensitivity and strong anti-interference capability, and can adapt to severe environments or environments with precision measurement requirements.

The invention discloses an electrode potential real-time monitoring device based on an oblique incident light reflection difference method. The device comprises a laser which is used for emitting a beam of elliptically polarized light, the polarized light sequentially passes through a photoelastic modulator and a phase shifter, and then is obliquely incident to a surface of a transparent electrodethrough an incident lens according to a preset incident angle, the reflected light returned from the surface of the transparent electrode passes through a polarization analyzer and then is convertedinto a voltage signal through a photodiode, and two lock-in amplifiers collect a fundamental frequency component signal and a frequency multiplication component signal of the modulation frequency in voltage signals and input the signals to a processor for processing. The device is advantaged in that the electrode potential of a transparent electrode\solution interface is monitored in real time byutilizing the oblique incident light reflection difference technology, change of the electrode potential is directly monitored in situ in real time, potential distribution of the whole electrode surface can be detected and imaged in a scanning mode, and a novel method is provided for space-time resolution measurement of the electrode surface potential.

The invention discloses a mechanical seal liquid film pressure intensity monitoring device, which comprises: a monochromatic collimation light source capable of emitting monochromatic parallel light;a polarizer which is used for forming the monochromatic parallel light emitted by the monochromatic collimation light source into polarized light; a first 1/4 wave plate which is used for allowing thepolarized light to pass through and forming first circularly polarized light; a second 1/4 wave plate which is used for eliminating the phase difference caused by the first 1/4 wave plate in the birefringent light and forming second circularly polarized light; the analyzer is used for changing the propagation direction of the second circularly polarized light to form a photoelastic bar chart; anda stereoscopic microscope which is used for amplifying the photoelastic bar chart. According to the invention, the online monitoring and measurement of the liquid film pressure can be realized in real time, the photoelastic fringe pattern can reflect the one-way pressure stress distribution and the liquid film pressure distribution of the moving ring sealing surface, and when the mechanical sealoperates abnormally, the light fringe pattern can fluctuate abnormally, so that the occurrence of sealing failure accidents is effectively monitored and prevented.

The invention discloses an elastic wave detection platform based on a photoelastic effect, the platform comprises an elastic wave generation unit and an optical elliptical polarization measurement unit, the elastic wave generation unit is composed of an adjustable voltage stabilization source and a piezoelectric actuator; the optical elliptical polarization measurement unit is composed of a He-Ne laser light source, a spectroscope, a polarizer, a photoelastic sampling sensor, a quarter-wave plate, a Wollaston prism, a photoelectric balance detector, an optical chopper, a lock-in amplifier and an oscilloscope. The platform is characterized in that various different elastic waves generated by a piezoelectric actuator act on a photoelastic sampling sensor which is independently researched and developed, the sensor generates a photoelastic effect under the action of the elastic waves, and detection of the elastic waves is completed through a photoelastic sampling technology in combination with an elliptical polarization measurement principle. On the basis of ensuring the mutual balance of precision, stability and cost, the method not only can realize the detection and capture of various elastic waves, but also has no special limitation and requirements on the test environment, has a larger extension creation space, can be conveniently combined with other test methods, and the possibility is provided for obtaining more elastic wave feature information.

The invention discloses an atomic clock frequency discrimination signal detection system. The detection system comprises an atomic clock control circuit system, a first optical system, a physical system, a second optical system and a microwave pulse synthesizer, the first optical system generates linearly polarized light; the physical system generates a frequency discrimination signal according tothe double-microwave pulse signal, and is used for realizing closed-loop locking of atomic clock frequency and rotating the polarization direction of linearly polarized light; the second optical system determines the component of the detection light which rotates after passing through the physical system in the vertical direction by using a photoelastic modulation technology; the atomic clock control circuit system determines an error voltage signal of atomic clock frequency closed-loop locking according to the component of the detection light in the vertical direction by using a cross-correlation detection technology; and the microwave pulse synthesizer generates a 6.8 GHz double-microwave pulse signal according to the error voltage signal. According to the invention, the photoelastic modulation technology and the cross-correlation detection technology are combined to improve the signal-to-noise ratio and the frequency stability of the atomic clock frequency discrimination signal.

The invention relates to a light bullet supplementing mechanism which comprises a bullet supplementing connector mechanism and a bullet poking wheel combination mechanism. The bullet supplementing connector mechanism enables thirty bullet belts to be limited between a thin guide strip and a thick guide strip, by disassembling a pin shaft in a detachable pin, a turning-over cover can be opened in two directions, the attention can be paid to the situation of entering a bullet box of thirty ammunition strings conveniently in the bullet supplementing process, and operation can be assisted manuallywhen it is necessary. The mechanism ensure that the thirty ammunition strings move according to the ruled path, mutual displacement of thirty bullets and thirty bullet belts is limited, and in the bullet supply process, the operation is assisted manually when it is necessary. A small bullet poking wheel and a large bullet poking wheel in the bullet poking wheel combination mechanism can ensure that the thirty bullets are carried horizontally, by rotating the small bullet poking wheel and the large bullet poking wheel, then the thirty ammunition strings enter the bullet box to complete bulletsupplementing, the mechanism transmits power in the bullet supplementing process, and the function of enabling the thirty ammunition strings to move orderly to enter the bullet box is achieved. The mechanism is light in structure, installing is convenient and adjustable, the service performance is improved effectively, and harm to staff is reduced.