6 results about "Interference phenomenon" patented technology

The embodiment of the utility model discloses an optical system and projection equipment, which can effectively reduce the interference phenomenon caused by the linearly polarized light characteristic of laser by performing spatial coherence suppression on a laser beam which is emitted by a laser module and has a first polarization state through a moving light homogenizing device. Therefore, speckles in the projection picture are reduced, and the quality and the visual effect of the projection picture are improved. Meanwhile, when the light homogenizing device rotates, the intersection point of the optical axis of the laser beam and the surface of the light homogenizing device and the center point of the rotating shaft of the light homogenizing device are not coaxial, the modulation effect on the laser beam is further enhanced, the coherence of the laser can be more fully damaged, and generation of speckles is further restrained. According to the technical scheme, by reasonably configuring the laser module, the light homogenizing device, the silicon-based liquid crystal module and the imaging assembly, the problems of speckles and the like are solved, and meanwhile miniaturization and cost optimization of the system can be possibly achieved.

The invention discloses a method for detecting p-nitroiodobenzene in a water body and soil based on ultra-high performance liquid chromatography, which comprises the following steps: 1, detecting by using an ultra-high performance liquid chromatograph, and determining different detection conditions according to the water body and the soil; 2, preparing a working solution of a detected object; 3, carrying out a specific experiment on the p-nitroiodobenzene; 4, carrying out a recovery rate and repeatability experiment, 5, carrying out a detection limit and a quantification limit, and 6, analyzing an experiment result. Compared with the prior art, the method has the advantages that the retention time of p-nitroiodobenzene in the water body is about 2.9 min, baseline separation of a target peak and other components can be achieved under the detection wavelength of 296 nm, interference of other impurities does not exist, the method has good selectivity, the retention time of p-nitroiodobenzene in soil is about 6.1 min under the detection wavelength of 296 nm, and the retention time of p-nitroiodobenzene in soil is about 6.1 min. Baseline separation of a target peak can be achieved, the separation degree of the target peak and other impurity peaks is larger than 1.5, the interference phenomenon of other impurities does not exist, and the method has good selectivity.

The invention discloses a photoelastic effect measuring device and a photoelastic effect measuring method, particularly relates to the technical field of optical measurement, and solves the technical problems that a traditional method in the prior art cannot record the change of a refractive index in a stretching process in real time, lacks dynamic analysis capability and is difficult to quantify the photoelastic effect. According to the technical scheme, the refractive indexes corresponding to different thicknesses after the PET plastic film is uniformly stretched are quantitatively measured by utilizing the high sensitivity advantage and the unique interference phenomenon of a Michelson interferometer, a refractive index-thickness curve is fitted by utilizing a least square method, an experimental phenomenon is presented through a visual interface, and the measurement accuracy is improved. Automatic data processing and uncertainty analysis are carried out, and a user is helped to deeply understand the photoelastic effect principle, namely the birefringence phenomenon of the photoelastic effect; according to the invention, automatic, quantitative, high-precision and visual measurement can be realized.

A kind of resonant fiber-optic gyroscope for detecting angular velocity signal, low coherence light is used as probe light source, the light intensity change signal caused by fiber-optic gyroscope rotation is detected using multi-beam interference phenomenon, i.e. under the action of sawtooth wave modulation signal, the periodic change frequency shift of probe light pulse is generated through Y waveguide in resonant fiber-optic gyroscope, and the corresponding photoelectric signal is obtained, the photoelectric signal is multiplied with Y waveguide driving signal and filtered to obtain the error signal with linear relationship with angular velocity, the detection of fiber-optic gyroscope rotation is realized. The light intensity change signal caused by fiber-optic gyroscope rotation is detected using multi-beam interference phenomenon of low coherence light, the structure of fiber-optic gyroscope system is significantly simplified, and high-precision measurement of rotation signal can be realized.

The application discloses a method for fine modification of the interior of a crystal based on double-beam laser focus interference, and belongs to the field of laser precision machining. The method is realized by adjusting the divergence angle of double beams by using a laser shaping device to realize the overlap of focus A and focus B. The double foci overlap and interfere, and the interference phenomenon of the energy intensity alternately changing occurs in the focus overlap area; under the interference, laser energy is concentrated to the interference enhancement position, and the energy peak value can exceed the modification threshold of the material interior, and modification occurs; the size of the double-focus overlap area is compressed relative to the conventional single-focus area, and the modification by interference only occupies a part of the overlap area, and the size of the modification area is further compressed. Compared with the conventional single-focus modification area, the longitudinal size of the modification by the method can be compressed by at least 50%, and the precision of the micro-nano structure in the processed crystal is higher. According to the characteristics of the crystal material, laser parameters are selected, and scanning is carried out according to a preset track, modification points form a modification line, and then high-precision machining of a complex micro-nano structure in the crystal can be realized.

The application discloses an intelligent measuring device for the wavelength of a laser light source, which comprises an interference ring stripe throughput phenomenon counting system, a continuous optical path difference generating and recording system, an upper computer related program system, an experimental platform and an integrated distribution box; the integrated distribution box is used for providing power supply for the above-mentioned other systems and the platform; the experimental platform comprises an interference phenomenon generating optical path system, an optical fiber target and an error operation emergency stop system; the upper computer and the program system thereof comprise a data transceiving and real-time monitoring module, a throughput counting module and an optical path difference generating and recording module; the continuous optical path difference generating and recording system is composed of a movable total reflection mirror, a transmission gear set, a two-phase stepping motor, a stepping motor driver and an STM32 single-chip microcomputer; the user inputs measuring information at the upper computer end, the instrument automatically generates a continuously changing phase difference, forms a throughput phenomenon and automatically records the throughput times, so as to calculate the wavelength of the laser light. The structure is simple, safe and reliable.