33 results about "Scattering channel" patented technology

A system, method, and apparatus are provided for flow cytometry. In one example, the flow cytometry system includes dual laser devices and dual scatter channels to measure velocity of particles in a core stream of sample fluid. The total flow rate of the sample fluid and the sheath fluid around the sample fluid is controlled, and thus held constant, by a feedback control system controlling a vacuum pump based on differential pressure across ends of a flow channel in the flow cell.

A multi-modal data acquisition system for detecting target material on a biological reaction surface, the system comprising a radiation source for generating an incoming beam that impinges on the biological reaction surface at an oblique incidence angle and produces a reflected beam, an interferometric detector for detecting an interferometric signal from the illuminated surface, the reflected beam being directed to the interferometric detector, a fluorescence detector for detecting a fluorescence signal from the illuminated surface; the fluorescence detector being positioned to substantially minimize the incidence of the reflected beam; and a processing system for receiving the interferometric and fluorescence signals and determining the presence or absence of target material on the biological reaction surface. A reaction surface conditioned for the simultaneous collection of fluorescence, interferometric and other signals. A multi-modal data acquisition system for collecting and processing additional modes, including multiple interferometric, fluorescence and scattering channels.

Methods for chemically-resolved optical microscopy are presented. The methods can provide a wide-field, spatial interference imaging using multiple nonlinear scattering channels to produce multiple, spatially coherent anti-Stokes Raman scattering (CARS).

The invention belongs to the field of electric system grounding for lightening protection, and relates to a multi-current scattering arm star-shaped grounding electrode topological structure. The multi-current scattering arm star-shaped grounding electrode topological structure is specifically suitable for a grounding electrode in a pole tower earth screen. A novel grounding electrode arrangement form is designed so that an impact grounding resistance value under a high earth resistivity can be reduced. According to the arrangement form, current scattering channels, in the grounding electrode, of a lightning current are increased, namely, each radiation branch of the star-shaped grounding electrode is additionally provided with at least one bifurcate current scattering arm, one end of each bifurcate current scattering arm is connected with the tail end of the corresponding radiation branch, the other end of each bifurcate current scattering arm extends in the radial direction, therefore, the better current scattering effect can be achieved, the impact performance of a grounding body is effectively improved, and the impact grounding resistance value of the grounding electrode is reduced. The structure is easy to manufacture and install, construction difficulty caused by the fact that the grounding electrode is lengthened blindly is avoided, a very good resistance reducing effect can be achieved, the performance is superior, and the structure is economical and reasonable.

The invention discloses a signal power measurement method suitable for a scattering channel, which relates to the field of wireless communication and comprises the following steps of: 1) determining acoherent bandwidth; 2) frequency hopping design; and 3) determining and calculating the time length of the signal average power. The invention aims to solve the problems that the signal acquisition time is long during scattering channel signal power measurement; the problem that the frequency selective fading influence cannot be reduced while the time selective fading influence is reduced is solved; according to the invention, the frequency diversity and time diversity thought is combined; through short-time statistics of frequency hopping signals, the influence of frequency selective fadingand time selective fading is greatly reduced, accurate measurement of signal power can be rapidly realized, and the method can be applied to signal power measurement under various fading channels, andplays a key role in application of antenna alignment, fading channel analysis and the like.

The present invention relates to the field of optical communication and provides a method and system for arranging link resource fragments. The method comprises: configuring cascade services in a link in advance; generating a preset arrangement method according to an initial channel number of occupied channel(s) in the link and a cascade number of service born in the channel(s) (S210); a local end node that initiates a link resource arrangement notifying an opposite end node to arrange link resource fragments (S220); the local end node and the opposite end node reconfiguring a cross connection according to the preset arrangement method (S230). The method and system of the present invention can re-arrange the channel resources within one link, and integrate the scattered channel resource fragments into complete and available resources with a broader bandwidth, thus achieving the maximum utilization of the link bandwidth resources.

The present invention relates to the field of optical communication and provides a method and system for arranging link resource fragments. The method comprises: configuring cascade services in a link in advance; generating a preset arrangement method according to an initial channel number of occupied channel(s) in the link and a cascade number of service born in the channel(s) (S210); a local end node that initiates a link resource arrangement notifying an opposite end node to arrange link resource fragments (S220); the local end node and the opposite end node reconfiguring a cross connection according to the preset arrangement method (S230). The method and system of the present invention can re-arrange the channel resources within one link, and integrate the scattered channel resource fragments into complete and available resources with a broader bandwidth, thus achieving the maximum utilization of the link bandwidth resources.

The invention provides a multi-input multi-output (MIMO)-based troposphere scatter communication random channel modeling method. Aiming at the situation of long-distance signal transmission under the technical background of MIMO, a troposphere scatter channel is selected as a research object. A troposphere is modeled into a differentiable curved surface according to the turbulent phenomenon of the troposphere; and scatterers are distributed on various points of the curved surface at random. According to the modeling method, firstly, an energy loss distribution model for scattered waves on the scatterer surfaces after electromagnetic waves enter the scatterers is established according to the turbulent incoherent scattering theory; energy losses are quantified according to the model; secondly, the invention provides a calculation method of a beam transmission distance under MIMO; and finally, a fading coefficient and a channel matrix of the MIMO-based troposphere scattering channel are deduced.

The invention discloses a modem suitable for an ultra-long-distance scattering link, which relates to a scattering communication system with long communication distance, serious frequency deviation and extremely low signal-to-noise ratio in the communication field. It consists of modulator, demodulator, intermediate frequency amplifier, auxiliary multiplexer, auxiliary splitter, rubidium clock unit and other components. The invention adopts the channel coding and decoding technology based on the CCSDS standard, so that the wireless communication system can be applied to the scattered channel environment with extremely low signal-to-noise ratio, and ensures high reliability transmission of services. The present invention also adopts the demodulation method of secondary spread spectrum and pilot frequency to ensure the low receiving threshold of the equipment and realize the rapid establishment and maintenance of equipment synchronization under the state of large frequency deviation. It is especially suitable for high-quality and high-reliability transmission of services on long-distance scattering communication links under the condition of Rayleigh deep fading channel.

The invention discloses a laboratory simulation method of atmosphere multiple-scattered channel laser communication pulse transmission. According to the method, the time impulse response function of an atmosphere multiple-scattered channel is calculated by using the Monte Carlo light tracking technique; the time-domain fluctuation data of receiving optical power is calculated by using a random phase screen-based laser atmospheric turbulence transmission numerical value simulation method; a computer is utilized to generate data signals which are subject to intersymbol interference according to the time impulse response function of the channel; and the data signals which are subject to intersymbol interference and the fluctuation influence of the receiving optical power caused by atmospheric turbulence are applied to optical signals through an electro-optic modulator. The method can simultaneously simulate intersymbol interference and the fluctuation effect of the receiving optical power and can provide atmospheric environment simulation support for the indoor performance test of an optical communication end machine.

The invention relates to a preparing method for a finned inner cooling structure cooling pipe based on gel electrochemical machining. The method specifically comprises the steps that preprocessing is carried out, and internal pipe flaw detecting and surface cleaning are carried out; the activating treatment should be carried out after inert metal is cleaned; a machining stage mainly comprises device platform establishing and an electrochemical machining stage, manual machining and automatic machining can be selected in the machining process in a self-service mode, and the machining efficiency is improved; a postprocessing stage mainly comprises checking and post cleaning, and purified clean water is used for performing cleaning during the experiment. The gel electrolyte comprising NaNO3 is planned to be utilized for being prepared into a rib shape, an electrode is selectively wrapped and machined to serve as a negative electrode, a machining piece serves as a positive electrode, and electrochemical machining is carried out. The preparing method is particularly suitable for machining of a finned inner cooling structure of the inner wall of a traditional pipeline, whether gel electrolyte is in contact or not can be controlled in a reaction area other structures of the pipeline cannot be affected, a finned cooling structure of the inner wall of the pipeline is achieved, and the cooling performance of a scattering channel is improved.

A system, method, and apparatus are provided for flow cytometry. In one example, the flow cytometry system includes dual laser devices and dual scatter channels to measure velocity of particles in a core stream of sample fluid. The total flow rate of the sample fluid and the sheath fluid around the sample fluid is controlled, and thus held constant, by a feedback control system controlling a vacuum pump based on differential pressure across ends of a flow channel in the flow cell.