1317results about How to "Improve time resolution" patented technology

A measurement apparatus for measuring traffic of packets with high time resolution is provided. The measurement apparatus includes an accumulation part for accumulating packet lengths of packets having predetermined header information in successively received packets, and storing an accumulated value of the packet lengths in a storage; and a periodic reading part for reading the accumulated value from the storage at predetermined time intervals, and outputting the accumulated value.

The present invention provides methods, devices and device components for detecting, sensing and analyzing molecules. Detectors of the present invention provide good detection sensitivity over a wide range of molecular masses ranging from a few Daltons up to 10s of megadaltons, which does not decrease as function of molecular mass. Sensors and analyzers of the present invention detect emission from an array of resonators to determine the molecular masses and/or electric charges of molecules which impact or contact an external surface of a membrane that is used to mount and excite the resonators in the array. Resonators in the array are excited via piezoelectric and/or magnetic excitation of the mounting membrane and, optionally, grid electrodes are used in certain configurations for electrically biasing for the resonator array, and for amplification or suppression of emission from the resonators so as to provide detection and mass/electric charge analysis with good sensitivity and resolution.

A method for reconstructing a high quality image from undersampled image data is provided. The image reconstruction method is applicable to a number of different imaging modalities. Specifically, the present invention provides an image reconstruction method that incorporates an appropriate prior image into the image reconstruction process. Thus, one aspect of the present invention is to provide an image reconstruction method that requires less number of data samples to reconstruct an accurate reconstruction of a desired image than previous methods, such as, compressed sensing. Another aspect of the invention is to provide an image reconstruction method that produces a time series of desired images indicative of a higher temporal resolution than is ordinarily achievable with the imaging system. For example, cardiac phase images can be produced with high temporal resolution (e.g., 20 milliseconds) using a CT imaging system with a slow gantry rotation speed.

A terahertz spectrometer having a wider range of terahertz radiation source, high temporal resolution of scanning (<0.0.099 μm or ˜0.3 pico second) over a wider range of scanning (up to ˜100 pico seconds). Also disclosed are exemplary applications of the spectrometer in biomedical, biological, pharmaceutical, and security areas.

A system and method for tomographic image reconstruction using truncated limited-angle projection data that allows exact interior reconstruction (interior tomography) of a region of interest (ROI) based on the linear attenuation coefficient distribution of a subregion within the ROI, thereby improving image quality while reducing radiation dosage. In addition, the method includes parallel interior tomography using multiple sources beamed at multiple angles through an ROI and that enables higher temporal resolution.

Disclosed are devices, a systems, and methods for determining the dipole densities on heart walls. In particular, a triangularization of the heart wall is performed in which the dipole density of each of multiple regions correlate to the potential measured at various locations within the associated chamber of the heart. To create a database of dipole densities, mapping information recorded by multiple electrodes located on one or more catheters and anatomical information is used. In addition skin electrodes may be implemented.

Method, systems and arrangements are provided for creating a high-resolution magnetic resonance image (“MRI”) or obtaining other information of a target, such as a cardiac region of a patient. Radio-frequency (“RF”) pulses can be transmitted toward the target by, e.g., an RF transmitter of an MRI apparatus. In response, multiple echoes corresponding to the plurality of pulses may be received from the target. Data from each of the echoes can be assigned to a single line of k-space, and stored in memory of the apparatus. An image of the target, acceleration data and/or velocity data associated with a target can be generated as a function of the data. In one exemplary embodiment, the data from different echoes may be assigned to the same k-space line, and to different cardiac phases. In one further embodiment, parallel processing may be used to improve the resolution of the image acquired during a single breath-hold duration. In yet another embodiment, utilizing a segmented implementation, multiples lines of k-space are acquired for a given cardiac phase (or time stamp) per trigger signal. The present invention may be utilized for the heart or for any other anatomical organ or region of interest for the evaluation and study of flow dynamics with very high temporal resolution.

A gated peak detector produces phase-independent, magnitude-only samples of an RF signal. Gate duration can span as few as two RF cycles or thousands of RF cycles. Response is linearly proportional to RF amplitude while being independent of RF phase and frequency. A quadrature implementation is disclosed. The RF magnitude sampler can finely resolve interferometric patterns produced by narrowband holographic pulse radar.

The invention discloses a laser speckle blood stream imaging analysis method. The method comprises: irradiating a laser beam on an object to be detected and continuously acquiring N frames of laser speckle images reflected by the object to be detected according to identical exposure time and frame intervals; taking pixels from a Ns*Ns spatial neighborhood corresponding to identical positions in each frame of image to form a pixel set; calculating a contrast Kst within the spatial neighborhood and then calculating the blood stream speed V(i, j) of a corresponding biological tissue by means of a relational expression of the contrast and the blood stream speed; and taking the blood stream speed value corresponding to each pixel as grey scale to establish a two-dimensional blood stream speed distribution map. The laser speckle blood stream imaging analysis method is based on space-time combined analysis of laser speckle blood stream imaging to carry out high time and spatial resolution imaging on blood stream of a biological issue, thereby realizing real-time, dynamic and high time and spatial resolution monitoring of two-dimensional blood stream distribution, blood vessel form and blood stream dynamic changes of the biological tissue. The analysis method is suitable for researching brain function imaging, neurophysiology, disease pathology and drug effect evaluation.

The invention discloses a detection method suitable for a sensing device of optical fiber distribution type temperature and stress. The sensing device of the optical fiber distribution type temperature and stress mainly comprises a light source module (1), a frequency discriminator module (2), and a thermo tank module (3), which are all connected with one another by polarization-preserving fiber. The detection method of the invention is a direct detection method which is based on optical fiber Raman scattering used as a carrier wave of temperature information, brillouin scattering used as a carrier wave of stress, rayleigh scattering used for measuring the relative frequency of a outgoing laser beam to the frequency discriminator and Fabry-Perot etalon used for discriminating frequency and distributing sensing temperature and stress. The invention has the advantages of simple structure, fine stability, avoidance of outgoing power of the light source during coherent detection, and outgoing frequency of the light source. Instability of acoustic modulation or electro-optic modulation frequency is directly referred to measure errors and the direct detection technology of frequency discrimination is not sensitive to the frequency drift of the light source and the fluctuation of signal intensity.

The invention discloses a Doppler anemometer laser radar structure and detecting method based on F-P etalon, which is characterized by the following: the optical path contains Nd: YAG laser to output two beams of laser, wherein one beam is launched towards sky through two-dimensional scanning unit of plane reflector; the other beam laser intersects the input end of two-in-one optical fiber coupler through optical fiber; the optical fiber receiving port is loaded at the focus point of telescope cylinder with the optical fiber intersecting the input end of two-in-one optical fiber coupler; the output end of two-in-one optical fiber coupler connects collimating mirror through optical fiber, whose optical path loads color filter, beam splitting piece at 4:1 transparent-reflect rate, F-P etalon; one rectangle reflecting lens is set in the reflecting optical path of transparent optical path and beam splitting piece of etalon separately with one photon count detector setting on two sides of reflecting surface of each rectangle reflecting lens; the output end of photon count detector intersects data gathering and disposing equipment; the invention adopts double-brink technology to detect the layout of tropospheric atmospheric wind field directly.

The invention discloses a building overall-deformation monitoring method based on a three-dimensional laser scanning technology. The method includes the following steps: obtaining building point cloud data, segmenting the point cloud data, regularizing the data, performing deformation analysis on a point cloud model and judging a building overall-deformation condition. The building overall-deformation monitoring method based on the three-dimensional laser scanning technology is capable of rapidly extracting three-dimensional space characteristics of the point cloud model from the building mass point cloud data and the space characteristics have rotation and translation invariance so that attitude of the building in a three-dimensional space can be expressed uniquely and according to the variance condition of the three-dimensional space characteristics of the building point cloud model, the overall deformation condition of the building, such as sedimentation, inclination and rotation and the like in the three-dimensional space can be analyzed and judged. The building overall-deformation monitoring method based on the three-dimensional laser scanning technology makes full use of complete point cloud data of the surface of the building to analyze the overall deformation condition of the building and the measurement and analysis technology based on faces effectively prevents locality and one-sidedness brought by a deformation analysis result in traditional deformation monitoring based on points.

A positron emission tomography detector for a multilayer scintillation crystal comprises a plurality of layers of scintillation crystals, a photoelectric detector system and an algorithm system, wherein the multilayer scintillation crystals comprises n layers of array scintillation crystals and m layers of continuous scintillation crystals, both n and m are integers which are greater than or equal to 1, the sum of n and m is smaller than or equal to 10, the array scintillation crystals are formed by arraying strip-type scintillation crystals along the width and length directions, the continuous scintillation crystals are scintillation crystals which have uncut inner parts, the array scintillation crystals and the continuous scintillation crystals are sequentially coupled along the height direction of the strip-type scintillation crystals to form the multilayer scintillation crystals, and the bottoms of the continuous scintillation crystals are coupled with the photoelectric detector system. The positron emission tomography detector can more accurately obtain the position and the time of energy deposition of gamma photon in the scintillation crystal, and has higher detection efficiency of the gamma photon, the spatial resolution, the time resolution and the flexibility of a positron emission tomographic imaging system can be improved when the positron emission tomography detector is applied to the positron emission tomographic imaging system, and further, the imaging quality of the system can be improved.

A system for probing a DUT is provided, the system comprising a tunable or CW laser source, a modulator for modulating the output of the laser source, a beam optics designed to point a probing beam at a designated location on the DUT, optical detector for detecting the reflected beam, and collection and signal processing electronics. The system deciphers perturbations in the reflected beam by detecting beat frequency between operation frequency of the DUT and frequency of the modulation. In an alternative embodiment, the laser is CW and the modulation is applied to the optical detector.

The invention relates to a magnetic resonance diffusion tensor imaging method which comprises the following steps: performing K space sparse sampling on an imaging object to obtain K space data of a diffusion weighted reference image; performing K space sparse sampling on the imaging object to obtain the K space data of a diffusion weighted image; performing share filling on the K space data of the diffusion weighted reference image and the diffusion weighted image by keyhole imaging; and performing image reconstruction on the K space data after share filling. The magnetic resonance diffusion tensor imaging method and system provided by the invention have the advantages of reconstructing complete data, shortening the scanning time, improving the data acquiring speed and achieving rapid imaging by adopting sparse sampling rapidly and continuously to acquire K space data and performing share filling under the action of the keyhole imaging technology.

A device for measuring aerosol size distribution within a sample containing aerosol particles. The device generally includes a spectrometer housing defining an interior chamber and a camera for recording aerosol size streams exiting the chamber. The housing includes an inlet for introducing a flow medium into the chamber in a flow direction, an aerosol injection port adjacent the inlet for introducing a charged aerosol sample into the chamber, a separation section for applying an electric field to the aerosol sample across the flow direction and an outlet opposite the inlet. In the separation section, the aerosol sample becomes entrained in the flow medium and the aerosol particles within the aerosol sample are separated by size into a plurality of aerosol flow streams under the influence of the electric field. The camera is disposed adjacent the housing outlet for optically detecting a relative position of at least one aerosol flow stream exiting the outlet and for optically detecting the number of aerosol particles within the at least one aerosol flow stream.

The invention discloses a device and a method for high-accuracy measurement of expansion coefficients of a metal wire. The method uses a PZT oscillating mirror system to perform frequency modulation on incident light at different times, can not only modulate parameter information to be measured to a phase difference, but also modulate the parameter information to be measured to in a frequency difference for the convenience of later signal treatments; and the device consists of an interference system, a high-speed PZT oscillating mirror system, a heating system and a signal processing system. Comparing the method with other measuring methods, a multi-beam laser heterodyne measuring method for measuring the expansion coefficients of the metal wire has the advantages of high space and time resolutions, high measurement accuracy, high linearity, quick dynamic response, large measuring range and the like, and simultaneously the method has the advantages of simple structure for an experimental apparatus, low power consumption, convenient operation, high repeatability, small experimental result error, high accuracy and the like. Because experimental phenomena are obvious and experimental data is reliable, the method and the device can be widely applied in the fields of engineering designs and the like, and have very high practical values in the field of laser ultra-precision measurements.

The invention provides a brain electrical signal and physiological signal fused fatigue detection system. Brain electrical signals closely associated with metal state, more capable of reflecting activities of the brain itself and having higher time resolution are adopted, other physiological methods of electrocatdiogram, electrooculogram, electromyography, breath, blood oxygen and the like are infused, the task status can be monitored in real time, efficiency of the fatigue detection system is improved, and comprehensive and dynamic advantage combination of the system is fully realized. The brain electrical signal and physiological signal fused fatigue detection system comprises a signal acquisition unit used for acquiring human body signals, the signal acquisition unit comprises a brain electrical acquisition unit used for acquiring the brain electrical signals, an electrocatdiogram acquisition unit used for acquiring electrocatdiogram signals, an electromyography acquisition unit used for acquiring electromyography signals, a signal processing unit used for receiving and processing the human body signals and a fatigue calibration unit used for calibrating fatigue according to the signals processed through the signal processing unit.

The present invention discloses analysis system and method of microbubble behavior in biomedicine ultrasonic field based on superhigh speed photograph technology. Specifically, he present invention includes proposing superhigh speed photograph system for observing the microbubbles in ultrasonic field and microscopic superhigh speed photograph system for observing single microbubble; presenting the method of analyzing the microbubble behavior in free field, near tissue and inside microtubule; and presenting the method of controlling microbubbles generation and breaking and estimating microbubble strain.

A method is disclosed for generating a voice-activated responsive action, such as a pulse or a measurement, with improved speed and time resolution. First, an operator calls an arming command to prepare the application, and then calls a trigger command to initiate the responsive action. The responsive action is generated immediately upon detecting the leading edge of the trigger command, resulting in an extremely fast response with precise timing. The particular responsive action may be determined by the type of sound detected, or by other information contained in the trigger command, or by the arming command, or by another prior command. Other types of preparatory events are disclosed. Efficient methods for identifying commands are disclosed. For all applications requiring an extremely prompt, precisely timed, hands-free response to a voice command, this invention is enabling.

The invention discloses an atmospheric detection laser radar based on a superconducting single-photon detector. Optical pulse emitted by a laser pulse generation unit points to a detected atmosphere through a transmitting telescope and a laser scanning unit, background noise of an atmospheric echo signal is filtered out by an optical preprocessing unit, an optical processing unit extracts atmospheric information, a superconducting single-photon detection unit detects the atmospheric echo signal, a data acquisition card collects the signal, and finally, a subsequent data inversion and display unit inverts and displays atmospheric parameter information. The atmospheric detection laser radar of the invention is different from the existing atmospheric detection laser radar in that the atmospheric detection laser radar of the invention uses a superconducting single-photon detector with low dark count, high quantum efficiency, wide wavelength response and low time jitter as a detection unit. By using the superconducting single-photon detector, the atmospheric detection laser radar has the advantages of high spatial resolution, high temporal resolution, large detection distance, high detection precision, and the like.