88results about How to "Improved Axial Resolution" patented technology

The invention discloses an inclined wide-field optical section scanning imaging microscope system and an imaging method thereof. The inclined wide-field optical section scanning imaging microscope system comprises a laser transmitting device, wherein laser transmitted by the laser transmitting device enters a laser scanning optical path consisting of a two-dimensional scanning galvanometer, a collimator lens group and a first microscope objective to perform inclined scanning on a sample on a sample platform; a second microscope objective, a field lens and a detector form an imaging detection optical path the optical axis of which is perpendicular to the laser scanning optical path; an imaging display control device respectively controls the synchronized action of the two-dimensional scanning galvanometer, the second microscope objective and the detector and the automatic displacement of the sample platform through a data acquisition card and a sample platform control device, and processes acquired imaging data of the detector to form wide field three-dimensional image information of the sample. The imaging microscope system and the imaging method disclosed by the invention have high scanning imaging speed and high resolution and can implement wide field scanning imaging.

The invention relates to a method for fixing a focus and measuring a curvature radius by confocal interference, and belongs to the technical field of optical precision measurement. The method comprises the following steps of: introducing interfering reference light based on a confocal light path; precisely positioning an apex of the surface of a tested spherical element and a location of the centre of a sphere by using the maximum value of a confocal interference response curve to obtain the curvature radius of the surface of the tested spherical element; and maximumly sharpening a main lobe of the confocal response curve. By the invention, the traditional confocal interference microscopy imaging technique is first applied to improvement on the fixed-focus precision of an optical measuring system, so that the optical measuring system has a higher axial resolution and a simple structure, and the research and development costs of the system device are reduced.

The invention discloses a two-dimensional modulation technique-based method for acquiring shear-layer images. In the method, a two-dimensional light modulator, such as a digital micro lens DMD, a transmission LCD and a reflective silicon-base LCOS, instead of a fiber grating in a microscope with the conventional structure is used for two-dimensional light modulation and generating a group of modulated patterns in different phases, and the modulated patterns as well as a two-dimensional phase-shift algorithm are used to rebuild the shear-layer images. Experiments show that under a condition ofkeeping the signal-to-noise ratio of the images, the shear-layer images rebuilt by two-dimensional modulation technology have a higher axial resolution compared with that of the shear-layer images rebuilt by one-dimensional modulation technology.

An optical sensor has: a sensing portion having an optical fiber to be disposed at a measurement point of temperature, distortion, pressure etc.; a light source to output a light to the sensing portion; and a photodetector to detect a backscattered light from the sensing portion. The sensing portion has a tape sheet and the optical fiber shaped into a corrugated form with a predetermined curvature. Alternatively, the sensing portion has a polymer optical waveguide with a core shaped into a corrugated form with a predetermined curvature.

A non-invasive system and method. Sample light is delivered into an anatomical structure, such that a portion of the sample light passes through a target voxel comprising brain matter in the head and is scattered by the head as signal light. The signal light is detected, changes in the level of water concentration or relative water concentration of the target voxel are detected based on the detected signal light, and a level of neural activity is determined within the target voxel based on the determined changes level of the water concentration or relative water concentration of the target voxel.

The invention discloses a double helix electrode capacitance tomography sensor for measuring an annular space that belongs to the field of an electrical process tomography device. The sensor comprises a main structure part and a capacitance measurement part. The main structure part is composed of concentric inner and outer tubes and a connection bracket used for fixing position. An annular space between the inner and outer tubes is a measured space. The capacitance measurement part comprises detection electrodes, electrode end shields, shielding cases, a signal transmission cable, ECT signal acquisition equipment and connection wires. By the utilization of electrode sensor parts which are respectively spirally arranged on the inner and outer tube walls, three-dimensional imaging of the measured annular space is truly realized. Due to the sensor structure with electrodes uniformly distributed on the two tube walls, imaging of the annular space is realized, and the problem of weak capacitance signal is also improved. The invention is a big breakthrough of the ECT technology.

The invention discloses a wide-view-field chromatography hyperspectral microscopic imaging method and device based on space-time focusing, and belongs to the technical field of microscopic spectral imaging and analytical chemistry. According to the method, ultra-short pulse lasers are generated through an ultra-short pulse laser source, focusing lines are generated in a sample through space-time focusing, excited fluorescence is collected, stray light is filtered out through con-focal optical slits, spectral information (x, lambda), of the sample is acquired through fluorescence spectral information collecting, and finally sample (x, lambda, y, z, t) five-dimensional information is acquired through three-dimensional space scanning and delayed scanning. The device comprises the ultra-shortpulse laser source, a light beam conversion system, a line scanning system based on space-time focusing, an optical microscopic system and a filtering and synchronous spectrum con-focal detection system. Acquisition of the spectral information in the filtering and synchronous spectrum con-focal detection system is synchronous with line scanning trigger signals in the line scanning system in combination with the space-time focusing technology. The method and device have the advantages of being wide in view field, high in space resolution, high in time resolution, high in spectral resolution andthe like.

The invention discloses a laser scanning saturate structured light illumination microscopic method based on phase modulation, and the method comprises the steps: enabling an illumination light beam after collimation to be converted into linear polarized light; loading a phase (0-phi) in a first direction to the linear polarized light, and adjusting the polarization direction of the linear polarized light; scanning a sample through the linear polarized light after the adjustment of the polarization direction, forming a first laser scanning saturate structured light illumination pattern where the sample is excited to generate fluorescent light, and collecting a first fluorescent light signal; loading a phase (0-phi) in a second direction to the linear polarized light, and adjusting the polarization direction of the linear polarized light; scanning a sample through the linear polarized light after the adjustment of the polarization direction, forming a second laser scanning saturate structured light illumination pattern where the sample is excited to generate fluorescent light, and collecting a second fluorescent light signal; carrying out the processing of the first and second fluorescent light signals, and obtaining a super-resolution image with the improved lateral resolution. The invention also discloses a laser scanning saturate structured light illumination microscopic device based on phase modulation.

The invention provides a method and a device of fluorescence microscopy by using a pyramid lens to generate structured lighting. The device comprises parallel beams, a structured lighting system, a sample cell and an image acquisition system, wherein the structured lighting system comprises a pyramid lens, a telescope system and a phase-shifting glass sheet; and the sample cell is arranged at the rear part of the phase-shifting glass sheet. The parallel beams are refracted after passing through the pyramid lens, thus generating a four-beam interference field with two-dimensional space structure distribution and exciting a sample by the four-beam interference field. The three-dimensional tomography can be realized through image processing algorithm by translating the interference optical field acted on the sample Compared with the existing microscopy for structured lighting, the invention can achieve higher axial resolution but lower photo-bleaching effect. Therefore, the invention is suitable for the research on the imaging of living creatures.

An ultrasound diagnosis apparatus having a transmission circuit which generates a transmission signal is provided. The transmission signal corresponds to a combined waveform of a trapezoidal waveform and an impulse-shaped waveform (impulse portion) . In an example transmission signal, a front slope portion, a flat portion, and a rear slope portion exist in a positive polarity side. The impulse portion has a shape which protrudes from an offset level over a base line into an opposite polarity side. Because the center frequency of the trapezoidal waveform is near the DC component, the trapezoidal waveform can substantially be ignored. The impulse portion has a large amplitude, but because the impulse portion exists over both polarities, there is no need to apply a special high voltage countermeasure for each polarity in designing the transmission circuit. A trapezoidal waveform of an opposite polarity may be added in front of the trapezoidal waveform.

The invention belongs to the technical field of chemical substance detection and relates to a differential confocal discrete fluorescence spectrum and fluorescence lifetime detection method and device. The basic thought is that a differential confocal object surface positioning technology with a precision axial resolution ratio and a discrete fluorescence spectrum and fluorescence lifetime measurement technology are fused; high-precision measurement of a three-dimensional shape of the surface of a sample to be detected is solved by utilizing a differential confocal technology; meanwhile, high-sensitivity detection of a fluorescence spectrum and fluorescence lifetime of each point on the surface of the sample to be detected is solved by utilizing the discrete fluorescence spectrum and fluorescence lifetime measurement technology, so that three-dimensional high-resolution space substance component distribution information is obtained. According to the differential confocal discrete fluorescence spectrum and fluorescence lifetime detection method and device, a differential confocal measurement technology and a fluorescence substance component detection technology are fused for the first time; a fluorescence imaging system has the same transverse resolution ratio on each position of the surface of the sample to be detected; finally, measured fluorescence spectrum distribution accurately corresponds to the three-dimensional shape. The technology provided by the invention has a wide application prospect in the fields of biological science, medical science, material science and clinical medical diagnosis.

The invention discloses an opto-acoustic/ultrasonic bimodal high-frequency probe based on ellipsoidal curvature, which comprises a probe shell, an ellipsoidal backing layer, a high-frequency piezoelectric element and a signal transmission line, a hole is dug in the middle of the side wall of the probe shell and is provided with the signal transmission line, the ellipsoidal backing layer is coaxially fixed on an incident light channel of the probe shell, a cylindrical structure is arranged in the middle of the ellipsoidal backing layer, the high-frequency piezoelectric element is pressed at the lower end of the ellipsoidal backing layer to form an ellipsoidal concave surface for expanding the depth of field, the middle part of the high-frequency piezoelectric element is provided with a middle digging hole matched with the cylindrical structure, and the shape of the ellipsoidal concave surface is matched with that of the ellipsoidal backing layer. The defect that the depth of field of an existing high-frequency probe is insufficient is overcome, the transverse resolution ratio and the axial resolution ratio of photoacoustic/ultrasonic imaging can be improved through the high-frequency piezoelectric element, and signals from deeper tissue can be received under the condition that the focus position does not need to be moved.

The invention discloses a TV constraint based tomography phase microscope reconstruction method. The method includes (1) acquiring a multi-angle phase image, (2) establishing a system matrix imaging model, (3) adding TV constraint, and (4) reconstructing a three-dimensional refractive index image. By establishing the system matrix model of microscope imaging, various uncertain factors in the data collection process are brought into a unified description framework; based on the image sparse feature, the image axial stretching effect due to missing cone is effectively alleviated, and the axial resolution of a microscope is improved; and meanwhile, the phase data is acquired by sparse angles, the total acquisition angle quantity is reduced, the imaging time is reduced, the time resolution of the microscope is improved, and the observation of the dynamic characteristic of biological samples is facilitated.

Methods are proposed to improve axial resolution in optical coherence tomography (OCT). In one aspect, the method comprises: obtaining a k-space interferogram of an OCT spectral image; uniformly reshaping the k-space interferogram to a quasi-stationary interferogram by extracting a source envelope; fitting a spectral estimation model to the quasi-stationary interferogram; and calculating an axial depth profile using the fitted spectral estimation model.

The invention discloses a multi-angle based selective light-sheet illumination microscopy imaging reconstruction method, and relates to the technical field of light-sheet illumination microscopy imaging. In order to eliminate influences imposed on the image quality by strip artifacts, scattering fuzz, uneven gray and transverse and axial resolution difference in a selective plane illumination microscopy (SPIM) imaging technology, the method proposes that scale-invariant features are extracted in allusion to microscopic body data acquired at different angles, matching is performed, a rotation center is solved through a clustering algorithm, and then reconstruction is performed by using a nearest neighbor algorithm and weighted averaging so as to clear body data of a sample. According to the invention, multi-angle images acquired by a selective light-sheet illumination microscopy imaging system are fused, image noises and scattering fuzz are effectively suppressed, and the longitudinal resolution of microscopic images is improved.