8 results about "Partial coherence" patented technology

The application discloses a kind of based on the partial coherence light field generation method and system of multi-core optical fiber, method includes: according to the cross spectral density function of target partial coherence light field determines multiple electric field modes and generates hologram;The phase distortion between the each core of multi-core optical fiber is measured and compensation chart is generated;After the superposition of both as synthetic hologram, the wavefront modulation of incident laser is carried out;Modulated light is coupled into multi-core optical fiber and exports target light field.The corresponding system includes mode and compensation chart generation module, hologram synthesis module, wavefront modulation module and coupling transmission module.The present application realizes system miniaturization and strong environmental adaptability using multi-core optical fiber, by hologram sequence and phase compensation combination, can flexibly generate and transmit multiple partial coherence light with specific spatial coherence structure, solve the problem that prior art is not flexible, difficult to apply in tortuous narrow environment.

The invention discloses a light intensity transmission diffraction tomography microscopic imaging method and system based on non-uniform axial sampling. According to the method, under the quasi-monochromatic LED partial coherent illumination condition, multiple layers of intensity images are collected in a non-uniform axial sampling mode in the optical axis direction, the collected intensity images are divided into different intensity image sets of dense sampling and sparse sampling, and three-dimensional frequency domain deconvolution processing is carried out respectively. According to the frequency domain sampling characteristic corresponding to the axial sampling step length, determining an effective frequency spectrum area without frequency spectrum aliasing in the sparse sampling intensity image set, and performing complementary fusion on the three-dimensional scattering potential frequency spectrums corresponding to different intensity image sets in the frequency domain to obtain complete and aliasing-free three-dimensional scattering potential frequency spectrums; and the three-dimensional refractive index distribution of the to-be-tested sample is recovered. On the premise that the three-dimensional imaging resolution ratio and the reconstruction precision are guaranteed, the axial sampling number and the data acquisition amount are remarkably reduced, the imaging efficiency of light intensity transmission diffraction tomography microimaging is improved, and the method is suitable for high-throughput three-dimensional imaging of unmarked biological samples.

The invention discloses a method for regulating and controlling transmission of a multicolor random electromagnetic Lorentz correlated light beam, which comprises the following steps of: constructing a cross spectral density matrix element of the multicolor random electromagnetic Lorentz correlated light beam on an initial plane based on a Lorentz type partial coherence function and a random electromagnetic beam cross spectral density matrix; then, in a free space transmission model, a cross spectral density matrix element at any position is deduced, and a light intensity and polarization degree expression at a transmission distance z is further obtained. By setting the initial parameters and the transmission distance, the spectrum frequency shift and the polarization degree characteristic of the light beam can be effectively regulated and controlled. The method provides a new thought for light beam transmission regulation and control in a complex medium, and has application value in the fields of optical communication, imaging and the like; according to the invention, the Lorentz correlation structure is expanded to the vector field, the combined regulation and control of the polarization state and the correlation structure are realized, the problem of single light beam intensity distribution form of a traditional Gaussian Schell model is overcome, and a novel light field resource is provided for polarization sensitive application.

A video measurement system for measuring a test object comprising an imaging system having an imager having an imaging pupil, the imager arranged for viewing at least a portion of a silhouette of a test object by receiving light transmitted by the test object over a first angular extent, an illumination system having an optical axis and emitting an illumination distribution of light along an optical path, the illumination system comprising a lens system and a subassembly having an illumination source, a pupil aperture, and a first polarizer, the first polarizer having a diameter that is smaller than the pupil aperture, and a second polarizer overlapping the first polarizer, the second polarizer having a diameter that is larger than the first polarizer, the second polarizer configured to rotate independent of and relative to the subassembly.

The utility model discloses a partially coherent light coherence degree regulation and control detection device, relates to the technical field of light beam transmission and conversion, aims to solve the problem that the time coherence degree and the space coherence degree of light beams cannot be regulated and controlled at the same time in the prior art, and adopts the technical scheme that a beam expander is arranged on the right side of a laser, and a phase modulator is arranged on the right side of the beam expander; a rotary scattering plate is arranged on the right side of the focal section adjusting mechanism; a convex lens III is arranged on the right side of the rotary scattering plate; a beam splitter I is arranged on the right side of the convex lens III; a double-slit plate is arranged on the rear side of the beam splitter I; and a time coherent light detection mechanism is arranged on the right side of the beam splitter I. According to the utility model, output light is simultaneously guided into the time coherent light detection mechanism and the double-slit plate by using the beam splitter I, and synchronous acquisition of coherent parameters is realized by combining the CCD camera, so that real-time regulation and measurement of time and space coherence of partially coherent light are realized.

The application discloses a kind of based on partial coherence encoding illumination large field of view high-resolution microscopic imaging method.The method uses programmable LED array as illumination light source, utilizes four non-symmetrical illumination patterns and n concentric circle sector illumination patterns, respectively obtains the bright-dark field intensity image of object under low numerical aperture;Using differential contrast algorithm, the complex amplitude of the object is initialized, the dark field intensity image is used as intensity constraint, and the high-frequency information of the object is recovered through multiple iteration updates, so that large field of view high-resolution microscopic imaging is realized.The application combines high-angle partial coherence dark field illumination with bright field illumination, which can record large field of view image without reducing spatial resolution, and provides a non-invasive, high-performance, low-cost, quantitative, simple and universal high-throughput imaging tool for life science and biomedical research.

The utility model discloses a partially coherent beacon emission light source of a large-aperture scintillator, and relates to the technical field of signal light source emission. In order to realize the technical effects that under the condition of atmospheric turbulence, the atmospheric refractive index structure constant is accurately measured by processing a received light intensity fluctuation signal, so that the atmospheric optical turbulence intensity and the earth surface sensible heat flux are effectively inverted, the technical scheme provided by the utility model is as follows: the partially coherent light source comprises four sub light sources, the four sub light sources are uniformly arranged on the light source substrate in an array mode; the sub light source comprises a bulb and a base, the bulb is installed on the base, and the base is installed on the light source substrate. A partially coherent beacon emission light source of a large-aperture scintillator comprises at least four partially coherent light sources which are uniformly spliced in an array mode; and the power supply module is used for supplying power to the transmitting end array part coherent light source. The method is suitable for the design of a large-aperture scintillator and the work of data transmission.

The invention relates to the technical field of computer machine vision, in particular to a partially coherent X-ray laminated diffraction imaging reconstruction method and system based on nerve blind deconvolution, and the method comprises the steps: obtaining emergent waves of interaction between a lighting probe and a to-be-reconstructed sample at each scanning position of the to-be-reconstructed sample through a scanning probe; performing fast Fourier transform on the emergent wave to obtain a wavefront function formed by the emergent wave on a detector plane; enhancing the actually acquired diffraction pattern by using an unsupervised neural blind deconvolution network, and adjusting the wavefront function amplitude based on the enhanced diffraction pattern; and reversely propagating the adjusted wavefront in the free space to the plane of the to-be-reconstructed sample, updating the sample function and the probe function at the scanning position by using the new emergent wave until convergence, and obtaining the image output of the to-be-reconstructed sample. The method can flexibly adapt to enhancement requirements of different coherence conditions, does not need any priori knowledge, and does not need a completely coherent diffraction pattern as label data.