37results about How to "Improve imaging frame rate" patented technology

The present invention belongs to the radar imaging technology field, and especially relates to a terahertz frequency band aperture coding high-resolution middle and long distance staring imaging device and method. The imaging device comprises a terahertz transmission module 1, a transmission antenna 2, an electric control secondary reflector array 3, a paraboloid primary mirror 4, a receiving antenna 5, a terahertz receiving module 6, a memory 7 and a system control host 8. The terahertz transmission module is connected with the transmission antenna, and the electric control secondary reflector array is connected with a system control host; the paraboloid primary mirror is configured to perform reflection and alignment of the terahertz coding wave beam; the receiving antenna collects the scattering echo signals of the surface of a target; the terahertz receiving module is configured to perform low noise amplification, frequency mixing and quadrature demodulation processing of the scattering echo signals; and the system control host performs relation imaging processing of the echo signals and the reference signals to obtain a target reconstruction image. The terahertz frequency band aperture coding high-resolution middle and long distance staring imaging device and method obtain the high-resolution capability in the wave beam of the identical caliber traditional radar diffraction limit and are fast in mode switching.

The invention discloses a method and device for adaptively scanning tomographic microimaging with wide view field and high-throughput, and belongs to the technical field of microimaging. According tothe method, the target imaging area of a sample is divided into a plurality of sub-areas by utilizing ultrashort pulse laser through a method of combining spatial and temporal focusing and scanning, each sub-area is quickly and adaptively scanned by adopting a time division multiplexing method, synchronous data collection is carried out, reconstruction and data processing are performed on collected microimages in each sub-area to obtain a three-dimensional spatial message of the target scanning area in a scanning cycle, and the four-dimensional information of a sample (x, y, z and t) is acquired through three-dimensional spatial scanning and delayed scanning. The device comprises an ultrashort pulse laser light source and beam conversion system, a sub-area scanning system combined with thespatial and temporal focusing technology, an optical microscopic and filter system, a synchronous microimaging system and an image reconstruction and data processing system. The device has the advantages of wide view field, high throughput, low exciting power, high signal-to-noise ratio and the like.

An on-vehicle multiple-beam optical phased array laser three-dimensional imaging radar system relates to the technical field of radar engineering and settles problems of short-distance object detection and low imaging frame frequency in an existing laser three-dimensional imaging system. The on-vehicle multiple-beam optical phased array laser three-dimensional imaging radar system comprises a multi-beam laser module, a transmitting module, a receiving module, a central processor and a distance measuring unit. The multi-beam laser module comprises a beam splitter, a phase modulator array, a fiber amplifier array and a collimating beam spreading array. The transmitting module comprises a unidirectional glass array and an optical phased array. The receiving module comprises an optical filterarray, a double-bonding-lens array, a surface array APD array, a quenching circuit and a distance measuring unit. A ground objective area is scanned through multiple laser beams, thereby obtaining corresponding point cloud data. The obtained data are processed, thereby realizing objective three-dimensional image reconstruction with advantages of high frame frequency, high resolution and large visual field. A detecting task to a ground object is finished in real time in high speed. The on-vehicle multiple-beam optical phased array laser three-dimensional imaging radar system has advantages of high measurement speed and high measurement precision.

The invention discloses a quick medical ultrasonic image system for multiple MV high-definition algorithms based on a GPU. The system comprises an initial starting module, an analog simulation module,an algorithm imaging module and a result display module, wherein the initial starting module completes system initialization setting and the calls the algorithm imaging module for imaging, the analogsimulation module serves as an auxiliary module to produce analog data to be used for other modules, the analog simulation module is a core module of the whole system and receives parameter settingsfrom the initial starting module and data of the analog simulation module or a data acquisition device for imaging calculation, and the result display module conducts last processing and display on the results of other modules and finally achieves quick imaging functions of the multiple MV algorithms. The quick medical ultrasonic image system can complete completed calculation of high-definition medical ultrasonic image algorithms within very short time, used GPU programming for the MV high-definition algorithms can be conveniently deployed on a computer with the GPU, and the quick medical ultrasonic image system can effectively meet the use demand and is good in practicability.

The invention discloses a fast polarization imaging device and method based on a time-sharing method. The device comprises a lens module, a polaroid, an angle rotation module and a high-speed camera imaging module. The polaroid is arranged in front of the high-speed camera imaging module, the angle rotating module drives the polaroid to rotate around the optical axis of the polaroid at a constant speed, external light rays are converged through the optical lens and then enter the high-speed camera imaging module through the polaroid, and the high-speed camera imaging module is used for exposing multiple times in the constant-speed rotating process of the polaroid, measuring light intensity images of the target scene at different polarization angles, and solving a polarization image by using the photographed light intensity images. According to the method, the imaging frame frequency of time-sharing method polarization imaging can be improved, tracking shooting of a certain moving target is achieved, the real-time performance of the time-sharing method is improved, and therefore the contradiction that time-sharing method rapid polarization imaging frame frequency improvement and polarization information authenticity guarantee restrict each other can be relieved to a certain extent.

The invention proposes a laser radar echo processing method based on an optical MEMS (micro-electro-mechanical system), and the method comprises the steps that a laser radar emits a laser pulse, is reflected on an MEMS micro-galvanometer, is irradiated to the surface of a to-be-tested target, is received by a receiving lens, and is concentrated in a detecting element on a focal plane; S2, the detecting element outputs a photoelectric signal, extracts the current time Tn from the photoelectric signal, obtains the range finding data Dn, and then stores the range finding data Dn, the position number Pij of the detecting element and a current scanning angle data (theta)n for package and storage; S3, the steps S1 and S2 are repeatedly executed according to a preset sample capacity till the datasatisfying the preset sample capacity is obtained; S4, a range of a response angle of the detecting element is determined, and finally the detecting element is constrained to respond within a corresponding angle range. The method does not need an additional high-precision measurement device for assistance, and can achieve the detection, calculation and confirmation of a receiving angle of a lasersignal reflected by the to-be-tested target.

The invention discloses a method for improving the two-dimensional array real-time ultrasonic body imaging quality. The method includes steps of setting transmitting and receiving array layout of area arrays; initializing parameters of the area arrays; converting polar coordinate forms of ultrasonic scanning areas into rectangular coordinate forms; approximating transmitting ultrasonic fields of the area arrays by the aid of far-field continuous waves to acquire spatial pulse response of the area arrays; performing CF (coherent factor) processing on received ultrasonic signals; acquiring bidirectional pulse echo response of the area arrays according to the processed ultrasonic signals; performing normalization logarithmic compression transformation on the bidirectional pulse echo response. The method has the advantages that the quantity of array elements of the area arrays and the quantity of channels of the area arrays can be reduced, the complexity of front-end circuits of three-dimensional ultrasonic systems can be decreased, the quality of three-dimensional images can be improved, and the purpose of real-time body imaging can be achieved.

The invention provides an ultrafast microscopic imaging system capable of simultaneously obtaining depth and surface information, which comprises a laser generator, wherein an output end of the laser generator is connected with an input end of a first coupler through a dispersive medium, a first output end of the first coupler is connected with a first end of a circulator, a second end of the circulator is connected with a first end of a collimator, the second end of the collimator is aligned with the first input/output end of a diffraction device, the second input/output end of the diffraction device is aligned with the plane of a plano-convex lens, the convex surface of the plano-convex lens is aligned with a sample to be measured, the third end of the circulator is connected with the first input end of the second coupler, the second output end of the first coupler is connected with the second input end of the second coupler through an adjustable delay medium, the output end of the second coupler is connected with the input end of a detector, the output end of the detector is connected with the input end of a high-speed oscilloscope, and the output end of the high-speed oscilloscope is connected with a signal processing module.

The invention discloses a three-dimensional imaging laser radar and method based on a unit single-photon detector, and relates to the field of three-dimensional imaging. The laser radar includes: a laser beam splitter; a main wave detector which records the emission time of the pulse laser according to the detected pulse laser; an optical emission system, wherein the optical emission system irradiates the other part of pulse laser onto a target object; an optical receiving system which receives pulse laser reflected by the target object and transmits the signals to an optical fiber array single-photon detector; the optical fiber array single-photon detector which detect the pulse laser reflected by the target object in a time-sharing manner to obtain the pixel coordinates of the target object and a receiving moment of pixel echoes; and a processor which determines a distance matrix according to the emission time, the pixel coordinates and the receiving time, so that non-scanning three-dimensional imaging can be performed on the target only by using the unit single-photon detectors, mutual interference between the adjacent unit single-photon detectors does not exist, and the three-dimensional imaging laser radar and method are easy to implement and low in cost.

The invention discloses an optical fiber combination-based numerical control phase-modulated light source device and a method. The light source device comprises a pulse laser emission module, a beam splitting module, a phase modulation and energy amplification module and a collimation and combination module, wherein the pulse laser emission module is used for emitting first pulse laser to the beamsplitting module; the beam splitting module is used for splitting the received first pulse beam into N beams of second pulse laser, and the N beams of second pulse laser are transmitted to the phasemodulation and energy amplification module through an optical fiber, N being more than or equal to 4; the phase modulation and energy amplification module is used for performing phase modulation and pulse energy amplification on each beam of second pulse laser to obtain N beams of third pulse laser; and the collimation and combination module is used for combining the N beams of third pulse laser to make the N beams of third pulse laser intersected and interfere on a conjugate surface to obtain a speckle field. According to the device and the method, the energy utilization rate is high, the imaging and detection distance is prolonged, and the repetition frequency of a laser pulse is increased to increase the imaging frame frequency of a laser correlated imaging system.

According to a fluorescence lifetime measurement mode based on a successive comparison method, voltage signals output by an optical detection unit are compared in real time and accepted or rejected mainly through an analog domain comparator so that the final output signals only comprise the highest voltage signal, the lowest voltage signal and a time signal, an effective data volume output by thesensor is greatly reduced, and bandwidth pressure is reduced.