38results about How to "Light path structure is simple" patented technology

The invention provides a distributed fiber white-light interference sensor array based on tunable Fabry-Perot resonant cavity, which is composed of a duplex photoelectric device, a tunable Fabry-Perot resonant cavity, a single-mode connection fiber and a sensor, wherein the tunable Fabry-Perot resonant cavity is composed of a scanning prism, a self-focusing lens, and a single-mode optical fiber with partial reflection surface; the duplex photoelectric device is composed of a wide-spectrum light source with a common base, an emitter and a collector, a photodetector, and a beam splitter prism; the beam with a certain spectral width is emitted by the light source to the resonant cavity directly through the beam splitter prism and is reflected multiple times by the left and the right surfaces of the resonant cavity to obtain a signal light; and the signal light outputted from the right cavity surface enters the sensor through the single-mode connection fiber, reflected by the left and the right end faces of the sensor, returns along the original path to the resonant, and is outputted from the left cavity surface to the photodetector. The distributed fiber white-light interference sensor array has a common light path structure and has the advantages of good temperature stability, simplest optical fiber path structure, low cost and high practicality.

The present invention relates to a method and its equipment for accurately measuring and analyzing vibratino of body by utilizing laser technique. The equipment includes laser, laser light source, focusing lens, transmission grating, light diaphragm, lambda/4 wave plate, reflecting prism, focusing lens, lens Wollaston prism, two photoelectric receivers, amplification circuit unit, signal processing unit and frequency mixing element.

A multi-channel fiber bragg grating absolute wavelength demodulation system based on a single detector comprises a broadband light source, a circulator, reference fiber bragg gratings, a 1*N optical switch, N-path sensing fiber bragg grating arrays, a tunable filter, a photoelectric detector and a data acquisition card. The invention simultaneously provides a demodulation method based on the system. The method is characterized in that the broadband light source generates light; the light passes through the circulator, then passes through the two reference fiber Bragg gratings and then is divided into transmission light and reflected light; the transmission light enters into the 1*N optical switch; a gating signal generated by the data acquisition card makes the light enter into a corresponding sensing fiber bragg grating channel; the reflected light enters into the tunable filter via the circulator; reflected light of a sensing fiber bragg grating also enters into the tunable filter via the circulator; frequency sweeping light is received by the photoelectric detector; a spectrum signal is converted into a time domain signal; then demodulation is performed so that a relative position of the reference fiber bragg gratings and the sensing fiber bragg grating is acquired. By using the system and the method of the invention, the system structure can be simplified and a wavelength measurement error caused by optical fiber transmission is eliminated.

The invention relates to an optical imaging touch sensing system comprising a touch screen, an infrared electronic pen and an image processing circuit, wherein the image processing circuit comprises two imaging sensing elements, the two imaging sensing elements are respectively arranged at two sides of the touch screen, and each imaging sensing element comprises a belt filter visible light optical lens. Bright spot images are formed on the imaging sensing elements arranged at two sides of the touch screen by invisible infrared rays emitted from the infrared electronic pen via a filter lens when the infrared electronic pen moves on the touch screen, the images are computed via the image processing circuit to resolve a two-dimensional coordinate of the infrared emitting pen on the touch screen, and finally, coordinate data are sent to a computer via a USB (Universal Serial Bus) interface, and positional information conversion from the infrared emitting pen to a computer mouse is realized through a computer positioning program. By virtue of the invention, the optical path structure of a sensor is simplified, the numbers of optical devices and hardware devices are reduced, meanwhile, an image processing mode is optimized by a special algorithm, and the anti-interference performance of the system is enhanced.

The invention discloses a bifocal wave zone plate interference microscopic-inspection device based on phase grating light splitting. The bifocal wave zone plate interference microscopic-inspection device comprises a 13.5nm of n ultraviolet light source, a vacuum chamber, a vacuum air-extracting pump, an air floatation optical vibration isolation platform, an extreme ultraviolet CCD (Charge Coupled Device), a five-dimensional precision fine-adjustment platform, a five-dimensional precision fine-adjustment platform controller and a bifocal wave zone plate interference microscopic-optical assembly based on the phase grating light splitting. The bifocal wave zone plate interference microscopic-inspection device disclosed by the invention has the advantages of simple structure, good vibration resistance, high accuracy and low system cost.

The invention discloses an integrated single-laser-source optical device for a movable cold atom interferometer, and the device comprises a laser source and a power amplification module which are usedfor generating single-frequency laser; a laser frequency stabilizing and adjusting module which is used for converting the single-frequency laser into seven laser frequencies required by the cold atom interferometer; a laser power stabilization, distribution and time sequence control module which is used for generating various lasers with specific frequency and power according to a time sequence;and a microwave source and electronics control module which is used for carrying out switching and time sequence control on all the modules, wherein the final output light is transmitted to the sensing head module of the atomic interferometer through the four polarization maintaining optical fibers. The device has the advantages of small volume, low power consumption, low cost, high stability andthe like.

The invention belongs to the technical field of optical fibers, and particularly relates to a multi-path optical path correlator with adjustable resonance cavity length, which is applied to a multiplexing optical fiber white light interference sensor array demodulation system. An optical resonance cavity is connected with an optical fiber light path by a coupler, the length of the resonance cavity is adjusted, the multiple travel of the optical path is performed, the multi-path optical path correlator consists of an optical resonance cavity with adjustable optical path, an optical fiber coupler, and a three-port or four-port optical fiber circulator, and the adjustable optical path difference signal can be generated by the reciprocating oscillation of the optical resonance cavity; a light signal containing the multi-path optical path difference is outputted by the coupler; the traveling direction of the light source is controlled by the three-port circulator, and the optical path correlation is performed through the connection with a light path of an optical fiber white light interface system. The multi-path optical path correlator has the advantages that the light path matching of multiple optical paths is realized, the demodulation capability of a sensing system is improved, the light path structure of the optical system is simplified, the system cost is reduced, and the stability and reliability of the system are improved.

The invention relates to an interference system based on Faraday rotation effect to measure displacement and angle at same time, wherein the crossed line polarized light of dual-frequency laser via first splitter is divided into reference and measuring beams; the reference beam via the first polarization device beat frequency to connect the first detector; the measuring beam via second splitter is divided into transmission and reflective beams; the transmission beam via one incident light feedback device based on beat Faraday rotation effect emits into the measuring mirror at the measured object; the reflective beam reflected by plane mirror emits to another incident light feedback device based on Faraday rotation effect; they will exit and emit to the same measuring mirror on the measured object; two beams emitting and exiting two incident light feedback devices based on Faraday rotation effect are parallel. The invention can realize high-accuracy large-scale displacement and angle measurements at them same, to be used in nanometer, micro photomechanical techbnique and integrated circuit chip.

The invention discloses a method and structure for packaging probes of a differential pressure sensor. The structure is characterized in that a gasket (86) is arranged on the periphery of a detection fluid inlet of a detection cavity (111), a filter screen (84) is arranged on the detection fluid inlet, a check ring (85) is arranged between an elastic membrane (113) and the detection cavity (111) to be used for shielding the elastic membrane (113), and an end cover (81) in a fixing hole is utilized to extrude and fix the elastic membrane (113) in the direction from the outside to the check ring (85); a thread sleeve (82) is arranged in the end cover (81) to fix optical fibers inside. The mode can guarantee machining precision and assembling precision, structures of the machined probes can be the same, therefore, realization of standardization, serialization and universalization is facilitated, and detection errors brought by the structural errors can be well avoided. The packaging structure can well fix fiber optics bundles.

The invention relates to a laser dual-axis confocal Brillouin-Raman spectral measurement method and apparatus realizing integration of images and spectrums, belonging to the technical field of microscopic spectral imaging. According to the invention, dual-axis confocal microscopy and spectral detection technology are organically fused, Rayleigh light is used for assisted detection, Raman spectral detection technology and Brillouin spectral detection technology are cooperatively used to realize high spatial discrimination image-spectrum integrated detection of a system, and high spatial resolution is achieved. The apparatus has three modes, i.e., a three-dimensional chromatographic geometric imaging mode, a spectral detection mode and a micro-area image-spectrum chromatographic imaging mode, obtains basic properties and a plurality of crossing effects of substances by detecting abandoned Brillouin diffusion light in confocal Raman spectral detection, realizes acquisition of a plurality of parameters like the micro-area morphology, state, texture and attributes of a measured sample in virtue of the characteristic that advantages of confocal Raman spectral detection technology and confocal Brillouin spectral detection technology are complementary, and has wide application prospects in fields like biomedicine, high energy manufacturing and material chemistry.

The invention belongs to the technical field of micro-spectrum imaging detection, and relates to a reflection-type confocal CARS micro-spectrum test method and a device. According to the reflection-type confocal CARS micro-spectrum test method, fusion of laser confocal microtechnique and CARS spectrum detection technology is realized, a binary beam splitting system is adopted for nondestructive separation of Reyleigh scattering light and CARS light, wherein CARS light is used for spectrum detection, and Reyleigh scattering light is used for geometric positioning. Accurate capturing and positioning of exciting light focal point position is realized based on the corresponding performance of confocal curve top point to focal point, high precision geometric detection and high spatial resolution spectrum detection are realized, and the method and the device capable of realizing sample microdmain high spatial resolution spectrum detection are constructed. The intensity of sample information-loaded Raman scattering light excited via combination of CARS microtechnique is much higher than that of conventional spontaneous Raman light, excitation time is short, and possibility is provided for rapid detection of biological samples and chemical materials. The reflection-type confocal CARS micro-spectrum test method possesses advantages such as accurate positioning, high spatial resolution, high spectrum detection sensitivity, and controllable measuring focusing spot size; and application prospect in the fields such as biomedicine and material detection is promising.

The invention discloses a three-primary-color laser single DLP projection system, which is characterized in that a control mainboard is in signal connection with a laser device driving circuit and a DMD chip, the control mainboard is used for controlling the driving current of the laser device driving circuit so as to control a RGB laser light source to emit light and controlling the DMD chip to perform image modulation on the laser emitted by the RGB laser light source, and a projection lens is used for projecting the light path modulated by the DMD chip. According to the optimally designed three-primary-color laser single DLP projection system, the DLP control mainboard is used for providing signals, and compared with the single-primary-color fluorescent powder and double-primary-color fluorescent powder laser projection technology, the complex double-color wheel synchronization problem is avoided, the light path structure is simplified, and the cost is low; and the laser high saturation characteristic is utilized, a light source adopts a laser device, and the display image color gamut is improved.

The invention discloses a distributed optical fiber vibration sensing system based on Rayleigh back scattering and Mach-Zehnder interference. The system comprises a phase sensitive optical time domain reflectometer, a one-way Mach-Zehnder optical fiber interferometer, a photoelectric detector and a signal processing unit which are connected in sequence, and also comprises a signal source used for generating a periodic pulse signal and a periodic high-frequency modulation signal; the signal processing unit collects sensing electric signals transmitted back by the photoelectric detector and then analyzes and demodulates the received signals so as to demodulate amplitude-frequency information of vibration signals applied to the sensing optical fiber. The invention also discloses a phase carrier demodulation method, which can effectively realize linear demodulation of a vibration signal applied to the sensing optical fiber by using a phase carrier demodulation technology which is not influenced by interference light intensity and modulation depth.

The invention provides an optical component weak absorption test device and method based on the equivalent temperature. The method is characterized in that firstly, a sample is irradiated with pump laser, after a steady state is realized, the highest temperature of the sample surface is recorded through utilizing an infrared thermal imager, and reflection and transmission powers of the sample aretested through utilizing a pump light power meter; secondly, a probing laser is utilized to (a CO2 laser, the spot size is the same as that of the pump laser spot) irradiate the surface of the sample,generally, an absorption rate of CO2 for an optical element such as a dielectric film is 1, the probing laser power is increased gradually to make the surface temperature of the sample reach the temperature of a first test, at this time, the power in a probing light power meter is read; and lastly, the sum of ratios of the reading of the probing light power meter to the reflection and transmission powers of the sample is the weak absorption rate of the sample surface. The method is advantaged in that the absorption rate of the CO2 laser is mainly 1 through utilizing a general optical element,the temperature characteristics of the sample under pump light irradiation are utilized to test the weak absorption rate of the surface, compared with technical tests in the prior art, not only precision is high, but also operation is simpler and more convenient, and no post-data processing is required.

The invention provides a spectral measurement device and method for an apparent spectrum of a water body. The device comprises an orientation adjusting module, a spectral measurement module, a data processing module, a storage display module and a power supply system, wherein the spectral measurement module is used for detecting spectral information of the water surface and the sky and transmitting the spectral information to the data processing module; the spectral measurement module comprises a spectrograph and at least three spectral channels respectively connected with the spectrograph, the spectral channels are used for measuring spectral data, and the spectrograph is used for receiving the spectral data and carrying out analysis so as to generate the spectral information; the data processing module is used for collecting the spectral information and carrying out data processing, so as to obtain a measurement result; the storage display module is used for receiving, storing and displaying the measurement result; and the orientation adjusting module is used for calculating the variation condition of a solar azimuth and rotating in a preset rule according to a calculation resultto enable the spectral channel to be always located on the back of the sun. Compared with the relevant art, the device is simple in structure and high in measurement efficiency, and the real-time monitoring can be realized.

An embodiment of the invention provides a high-field Terahertz spinning emitter and a spectrometer. The high-field Terahertz spinning emitter comprises a ferromagnetic nanometer film in a preset sizeand first and second magnets; the first and second magnets are both fixed in the plane where the ferromagnetic nanometer film is fixed and are arranged in one straight line, a first pole of the firstmagnet is arranged opposite to a second pole of the second magnet, the polarity of the first pole is opposite to that of the second pole, and the ferromagnetic nanometer film is arranged between the first and second poles; and pumped laser in the preset pulse width with preset single pulse energy penetrates the ferromagnetic nanometer film to generate Terahertz pulse radiation in the preset spectral width and preset radiation field intensity. The high-field Terahertz spinning emitter can generate ultra-wideband high-field Terahertz pulse radiation, and overcome disadvantages when the high-field Terahertz pulse radiation is generated in the prior art.

The invention discloses a portable broadband miniature continuous spectrum measuring instrument, and belongs to the technical field of spectrum instruments. The portable broadband miniature continuousspectrum measuring instrument aims at solving the problems that adapting to environment monitoring is not available and the requirements of convenient carrying and installation and the wide spectrummeasurement range need to be met. An incident slit, a collimating lens, a color scattering element, a focusing element and a photometric detector are sequentially arranged on the output path of lightoutput by a light guide fiber, wherein the collimating lens is provided with a first side face and a second side face which are arranged oppositely, the first side face is of a plane structure, the second side face protrudes outwards to form an arc surface, a plurality of concentric annular convex textures are formed in the second side face, and the longitudinal sections of the concentric annularconvex textures are in a zigzag shape. The broadband requirement is met, the size of a spectrograph is reduced, and the portable broadband miniature continuous spectrum measuring instrument has the advantages of being high in carrying performance and high in measurement accuracy.

The invention provides a coherent population trapping cold atomic clock based on a grating chip and an application method thereof, relates to the technical field of atomic clocks, and aims to optimize the structure of the cold atomic clock to a certain extent and reduce the size of the whole device. The invention provides a coherent population trapping cold atomic clock based on a grating chip. The coherent population trapping cold atomic clock comprises a grating magneto-optical trap, a detection system, a magnetic shielding system and an atomic source, the magnetic shielding system comprises a first magnetic shielding mechanism and a second magnetic shielding mechanism arranged in the first magnetic shielding mechanism; the grating magneto-optical trap comprises a vacuum cavity located in the second magnetic shielding mechanism, a grating chip arranged at the bottom in the vacuum cavity, a pair of reverse Helmholtz coils arranged on the upper side and the lower side of the vacuum cavity and an incident light assembly located on the upper side of the second magnetic shielding mechanism, and one end of the atomic source is connected into the vacuum cavity; the detection system comprises a detection light assembly and a reflection assembly which are oppositely arranged on the two sides of the second magnetic shielding mechanism, and a pair of Helmholtz coils which are oppositely arranged on the two sides of the vacuum cavity.

The invention discloses a depth image texture and color recovery method and system, and the method comprises the steps: calibrating an image, determining the relation between a visible light image and a depth information image, and generating a mapping relation table; acquiring distance information by using a ToF (Time Flight) sensor and processing in a processing system to generate depth information; acquiring image information by using a visible light sensor, and processing the image information in a processing system to generate a visible light image; in the image fusion module, carrying out image fusion according to the mapping relation table, and generating a depth information graph with textures and real colors; and transmitting or displaying the depth information, the visible light image and the fused depth information image. The system comprises an optical system and a hardware system. The method has the advantages of simple light path structure, efficient and reliable image calibration method, clear 3D image texture details and the like.

The invention belongs to the technical field of motion precision measurement of linear workbenches, and discloses a measurement system and method with a rolling angle self-correction function. The mode of measuring the rolling angle through double light beams needs to ensure that the two light beams are parallel in principle to measure accurate rolling angle errors, however, due to the fact that a right-angle reflecting mirror is mounted on a small two-dimensional angle adjusting frame, a spring component in the right-angle reflecting mirror cannot be inevitably changed slightly after a long time, and due to the reasons such as angle drift of the laser, tiny angle change is generated between the two beams of light, so that the measurement accuracy of the rolling angle error is influenced by non-parallelism generated by the two beams of light, and the non-parallelism generated by the two beams of light is shown in the figure 4. The non-parallelism between the two beams of light can be reflected to two calibration instruments for measuring the pitch angle error, so that the change between the non-parallelism of the two beams of light can be monitored in real time through double-calibration instruments, and then the change is compensated to the roll angle, so that the real roll angle error can be obtained.