187results about How to "Low stability requirements" patented technology

The invention relates to parallel complex frequency domain optical coherence tomography imaging method and system, wherein the method comprises the following steps of: on the basis of the parallel complex frequency domain optical coherence tomography imaging method, replacing a reference plane reflector of an interference reference arm with an inclined reflection grating, and enabling the first-level diffraction light of incident reference light to reversely return along an original incident light path, thereby leading linear space phase modulation in a two-dimensional frequency domain interference strip along the direction of parallel detection, which is obtained by a two-dimensional photoelectric detector, i.e. leading a spatial carrier in the two-dimensional frequency domain interference strip; then carrying out Fourier transformation on the two-dimensional frequency domain interference strip containing the spatial carrier along the direction of parallel detection, next obtaining a two-dimensional complex frequency domain interference strip sequentially through the processes of filtration trough a frequency domain filter window, coordinate transformation and the Fourier transformation along a frequency spectrum direction, and finally obtaining a chromatogram of an object to be measured through the Fourier transformation along a light frequency direction. The invention has simple structure and high imaging speed, and the chromatogram of the object to be measured can be obtained by only needing exposure for one time.

The invention discloses a method for preparing magnetic composite nanoparticles with a core-shell structure. In the method, electrostatic self-assembly and seeded emulsion polymerization are combined, wherein the electrostatic self-assembly is used to synthesize particles with the core-shell structure first and then emulsion polymerization is performed by using the particles with the core-shell structure seeds and using an initiator to prepare the magnetic composite nanoparticles with the sandwich core-shell structure which has three or more layers. The magnetic composite particles prepared by the method have a multi-layer sandwich core-shell structure, wherein in the structure, the core is a polymer microsphere, a Fe3O4 magnetic particle layer is in the middle, and different polymer layers are covered outside. The prepared particles have stable structures, strong and uniformly-distributed magnetism, smooth surfaces, controllable sizes, high stability and low cost, the thicknesses of the covering layers of the prepared particles can be controlled by nanoscale, and the adaptability of the prepared particles is high. Particles with specific surface groups can be prepared according to requirements and can be used in fields of biochemical separation, targeting preparation, immobilized enzyme, immunoassay, catalysis study and the like.

The invention discloses a comparison type calibration method for a dynamic measurement system, wherein a standard transducer and a calibrated transducer are used for comparison and calibration testing, the standard transducer and the calibrated transducer are arranged together, so as to measure a same physical quantity simultaneously, and then the uncertainty caused by the repeatability of the dynamic measurement system is assessed by a statistical analysis method. The scheme of the invention is widely used, is easy to operate and can ensure the uniformity of calibration test dynamic sources at different times.

A method and apparatus for measuring at least one polarization-related characteristic of an optical path (FUT) uses a light input unit connected to the FUT at or adjacent a proximal end of the FUT anda light output unit connected to the FUT at or adjacent its proximal or distal end. The light input unit injects into the FUT at least partially polarized light having a controlled state of polarization (I-SOP). The output light unit extracts corresponding light from the FUT, analyzes and detects the extracted light corresponding to at least one transmission axis (A-SOP), and processes the corresponding electrical signal to obtain transmitted coherent optical power at each wavelength of light in each of at least two groups of wavelengths, wherein the lowermost (lambda 1) and uppermost (lambdau) said wavelengths in each said group of wavelengths are closely- spaced. A processing unit than computes at least one difference in a measured power parameter corresponding to each wavelength in awavelength pair for each of the at least two groups, the measured power parameter being proportional to the power of the said analyzed and subsequently detected light, thereby defining a set of at least two measured power parameter differences; computes the mean-square value of said set of differences; and calculating the at least one polarization-related FUT characteristic as at least one predetermined function of said mean-square value, the predetermined function being dependent upon the small optical frequency difference between the wavelengths corresponding to the said each at least said two pairs of closely-spaced wavelengths.

The invention relates to a video presenting method for an intelligent mobile terminal, the video presenting method being characterized by comprising: when the intelligent mobile terminal shoots video, recording displacement and/or rotation information of the intelligent mobile terminal during the shooting process, and then storing the displacement and/or rotation information of the intelligent mobile terminal during the shooting process together with a shot video file; when the intelligent mobile terminal plays the above-mentioned video file, recording the displacement and/or rotation information of the intelligent mobile terminal during a watching process, and if the displacement and/or rotation information during the watching process is matched with the displacement and/or rotation information during the shooting process, playing the above-mentioned video file. According to the video presenting method for the intelligent mobile terminal, besides audio and video information, the displacement (rotation) information is also stored when shooting the video, so that a viewer can experience the video from another new media dimensionality; through the delivered displacement and/or rotation information, the immersion of the viewer when watching the video is improved due to the displacement and/or rotation actions of the viewers synchronous with the video maker.

The invention discloses a polarization shift keying demodulation method and a system. The method comprises the steps of: splitting a single-frequency continuous laser wave beam in an adjusted polarization state into a horizontal polarized light wave beam and a vertical polarized light wave beam which are orthogonal to each other, and conducting polarization shift keying modulation to one light wave beam to form a polarization shift keying modulated light wave beam; keeping the polarization state of the other light wave beam to be unchanged and using the other light wave beam as a reference light wave beam for the polarization shift keying modulated light wave beam; combining the polarization shift keying modulated light wave beam with the reference light wave beam, successively conducting power amplification, filtration and transmission, filtering carrier signals, converting into light current, then converting into light voltage and judging in a voltage comparator to obtain data corresponding to polarization shift keying modulation signals. By using the polarization shift keying demodulation method and the system, matched dynamic polarization control is not required during demodulation judgment at a receiving end, a transmitting end is not required to conduct differential encoding to the data and the complexity of the transmitting end is reduced; and a local light source is not required, the requirements on the accuracy and stability of a light path are reduced and the cost is saved.

This invention discloses a light-emitting diode lighting circuit, which comprises light-emitting diode array and the constant current source circuit, characterized in that it will decrease the stability requirement of the power through the current stabilization function of the constant current source, by which it need not use high energy consumption current-limiting resistance when connecting direct current power supply; when connecting alternating current power, it makes the light-emitting diode working normally only need to use the simple electric rectification scheme. The invention also discloses a circuit made of discrete component, which can realize constant-current and alternating current rectification scheme.

The invention relates to an upper rectification phosphorescence immune chromatographic test paper testing system which comprises: the lighting system comprises an exciting light source and an optical fiber beam, a collimation lens, a dichroic mirror and a front mirror group on the output light path of the exciting light source, wherein the test paper is on the object plane of the front mirror group; the angle between the reflecting side of the dichroic mirror and the light shaft is 45 deg.; the imaging system is formed by a front mirror group with the same light shaft, a dichroic mirror, a light filter and a rear mirror group; the phosphorescence image receiver is CCD which is on the image plane of the rear mirror group; the output end of CCD is connected with the data collecting circuit which is connected with a control system.

The invention discloses a differential vibration isolation type MEMS (micro-electromechanical system) vector hydrophone and solves the problems of the conventional elastic vibration isolation structure that sound scatters, amplitude decreasing only works on special frequency band noise and structure is poor in stability and reliability. The differential vibration isolation type MEMS vector hydrophone comprises a silicon base frame, cantilevers, a central connector, an upper minitype cylinder and a lower minitype cylinder. The minitype cylinders are bonded symmetrically. Eight strain varistors are formed on each cross cantilever. During operation, vibration of a platform acts on the minitype cylinders in the inertia force manner, and the minitype cylinders generate equal and reversed torques; a voice signal generates a different-mode signal through a sealing structure and acts the minitype cylinders, and the minitype cylinders generate different-mode torques. Based on the common-mode rejection characteristic and the different-mode output characteristic, vibration is damped. The different vibration isolation type MEMS vector hydrophone is simple and reliable in structure, effective in damping and unaffected by vibration sources and vibration frequency.

An optical particle corrector with a straight optical axis for eliminating color and aperture aberrations in optical particle lenses includes multipole elements in the form of electric and/or magnetic quadrupole and octupole elements. There are at least twelve quadrupole elements and ten octupole elements, in which three quadrupole elements and two octupole elements are assembled into a group. These groups are arranged successively along the straight optical axis, in which a first symmetrical plane is defined between the first and second groups, a second symmetrical plane is defined between the second and third groups and a third symmetrical plane is defined between the third and fourth groups. The multipole elements from one group to another correspond to each other in pairs, in which the multipole elements of the corresponding following group are positioned in reverse order along the straight optical axis in comparison with the corresponding multipole elements of the preceding group. The structure and refractive powers of the multipole elements that correspond to each other are mirror-symmetrically configured relative to the corresponding symmetrical plane between the groups. At least two of the quadrupole elements generate electric-magnetic quadrupole fields, in which the quadrupole element are, preferably, arranged in a mirror-symmetrical manner relative to the second, or to all, symmetrical planes. An additional octupole element is arranged in the first and third symmetrical planes. The corrector enables the transmission of extremely large image fields, while the optical quality remains the same due to the fact image aberrations outside the axis can be corrected.

The invention belongs to the field of satellite communication and satellite navigation technologies and discloses a low-orbit satellite radio ranging signal-based single-star positioning and time service method. According to the method, a non-iteration method is used to solve the approximate coordinates and clock skew of a receiver; on the basis of the approximate coordinates and clock skew of thereceiver, an iteration method is adopted to solve the approximate coordinates and clock skew parameter of a user; and an equation ill-conditioned problem is solved through a regularization method, sothat the stable and reliable three-dimensional coordinates and clock skew of the user can be obtained. With the method of the invention adopted, the cost and power consumption of the receiver can bedecreased; and it only needs the receiver to simultaneously receive ranging signals from a low-orbit satellite at a plurality of time points, so that the three-dimensional coordinates and receiver clock skew of the user can be accurately solved. The low-orbit satellite radio ranging signal-based single-star positioning and time service method is applied to the low-cost location service sensor fields such as the Internet of Things, search and rescue.

The invention belongs to the field of measurement of optical parameters, and particularly relates to a time-resolved measurement system and a method for reconstructing the optical parameters of turbid media. In order to realize fast, real-time, non-invasive in-vivo measurement of the optical parameters of an organizer under different wavelengths, the invention utilizes the technical scheme as follows: laser emerging from a variable attenuator enters into turbid media through incident optical fiber to be scattered or absorbed, and then reflected or transmitted laser from the surface of the medium is received by detection fiber; the laser detected by detection fiber is sent to a PMT detector with refrigeration function, electronic pulse output by the PMT detector is input to a time-correlated single photon counting (TCSPC) module, and the TCSPC module obtains a time extension curve emerging from an organization and inputs the curve into a computer for processing. The invention is mainly used for measuring the optical parameters of the organizer under different wavelengths.

The invention relates to a laser illumination distance gating imaging device, belonging to the technical field of laser imaging and comprising a laser, near infrared camera, a synchronous control unit, a receiving telescope, an image signal processor, a central processing unit, an image monitor and a synchronous control unit; the laser is a laser outputting human eyes safe laser with output wavelength being 1.5mu m-1.6mu m; and the synchronous control unit comprises a photodiode, a timing unit and a distance gating shutter. The invention has the main characteristics of high peak power, relative safe for human eyes, high conversion efficiency and high sensitiveness.

The invention discloses a closed-loop testing system of a direct-current transformer. A standard source collection module and an optical fiber receiving module are arranged in the closed-loop testingsystem, analog signals outputted by a standard source through a secondary terminal are acquired through the standard source collection module and converted into first digital signals, and second digital signals outputted by the direct-current transformer applied with standard source primary terminal output signals are acquired through the optical fiber receiving module. Under the action of synchronizing clock signals transmitted by a synchronizing module, the first digital signals and the second digital signals are synchronously received, processed, packed and uploaded to an upper computer through a digital synchronization processing module connected with the synchronizing module, and finally, the upper computer completes closed-loop testing of the direct-current transformer according to the first digital signals and the second digital signals. The closed-loop testing system lowers requirements on stability of a standard source and improves accuracy of testing results.

The invention provides a fast multi-channel spectrometer for LED full spectrum detection. The fast multi-channel spectrometer comprises an optical system, a detector, a signal processing circuit, a single chip microcomputer main control system and a control signal generating circuit. The optical system uniformly irradiates light emitted by an LED to the detector, the structure of the optical system is a crossed Czerny-Turner system; the detector is an MOS linear array image detector S3901-256LVF, which is composed of a self-scanned photodiode array provided with a linearly variable filters; the signal processing circuit is used for driving the detector and amplifying a signal output by the detector; and the single chip microcomputer main control system controls the control signal generating circuit to generate two paths of input signals required by the signal processing circuit including a main clock signal and a main initiating signal. The fast multi-channel spectrometer can realize the diversification of test parameters, can detect a plurality of signals in parallel at the same time, has very short measurement time, is high in signal-to-noise ratio, has low requirement on stability of a light source, and can obtain spatial resolution and time-resolved spectrum without adopting mechanical scanning.

The invention discloses a near-field holographic-ion beam etching preparation method of a variable-spacing raster. A high-linear density variable-spacing raster is prepared by use of the near-field holographic-ion beam etching method. Compared with the common holographic-ion beam etching method, the holographic preparation light path of the variable-spacing raster can be simplified; requirements on stability of a holographic system is reduced; and precision of linear density repeatability is improved. Compared with the mechanical scratching method, a variable-spacing raster with high linear density and smooth rectangular groove-shaped profile can be easily produced. Compared with the normal nano-imprinting technology, by optimizing the near-field holographic-developing conditions, the duty cycle of the obtained photoresist raster mask in a certain range can be regulated. Thus, the preparation method is very important for preparation technology of the required variable-spacing raster in the field of laser plasma diagnosis, synchronous radiation and the like.

The invention discloses a method for depositing a metal elementary substance thin film by atmospheric cold plasmas. The method comprises the following steps:step 1, mixed gas is excited and ionized togenerate the atmospheric cold plasmas, and the atmospheric cold plasmas form plasma light flame in a cavity of a nozzle; step 2, a metal compound solution is atomized and then enters the cavity of the nozzle; and step 3, under surrounding protection of the protective gas, the plasma light flame and fog drops generate action, solvent in the fog drops is evaporated, a metal compound in the fog drops is reduced into metal particles, and the metal particles are sprayed onto a substrate to be deposited to form the continuous metal elementary substance thin film. According to the method, the metalelementary substance thin film can be deposited under normal pressure, reaction temperature is low, the method is suitable for a heat sensitive substrate, a vacuum or closed deposition chamber is notneeded, so that the size of the substrate is not limited by space, and application range of the method is expanded; and the metal elementary substance thin film prepared by the method is stable in property, post-processing is not needed, so that the technological process is shortened, and production efficiency is improved.

The invention provides a device for detecting concentration of SF6 in a GIS pipeline off line. The device comprises a light source module and a signal analysis module which are respectively connected with a gas tank module, wherein the gas tank module comprises a standard tank and a sampling tank which are used for storing a standard SF6 mixed gas and a to-be-tested SF6 mixed gas, respectively; the light source module is used for emitting infrared light to the gas tank module; the signal analysis module is used for analyzing the concentration of the to-be-tested SF6 mixed gas in the sampling tank according to an infrared light signal and an SF6 gas database. Compared with the prior art, the device provided by the invention can be used for accurately measuring the concentration of SF6 in the GIS pipeline, and is simple in operation and high in reliability.

The invention discloses a microwave radiation measurement system for satellite-borne one-dimensional comprehensive aperture. The system comprises a scene radiometer receiver array, a calibration radiometer receiver, and a vibrating mobile phase network. The scene radiometer receiver array is used for receiving a scene microwave signal and an equivalent power internal noise source coherent signal and outputting an intermediate frequency signal. The calibration radiometer receiver is used for receiving a cold air external calibration signal and the equivalent power internal noise source coherentsignal, and calibrating through the cold air external calibration signal and a matching load so as to utilize the calibrated radiometer receiver to measure the equivalent power internal noise sourcecoherent signal in real time. The scene radiometer receiver array and the calibration radiometer receiver share the vibrating mobile phase network, so that the vibrating mobile phase network suppliesrequired local oscillator signals to the scene radiometer receiver array and the calibration radiometer receiver. The microwave radiation measurement system is simple in structure and easy to realize,and has the advantages of capable of measuring the equivalent power internal noise source coherent signal in real time, reducing the stability requirement of the equivalent power internal noise source coherent signal and the engineering realization difficulty, and improving the phase scaling precision.

The invention discloses a nearby wake-up method and device of a terminal, computing equipment and a storage medium. The method comprises the following steps that: when a target terminal receives the wake-up word of a user, a target audio with a set duration is obtained; the target terminal calculates a wake-up voice signal-to-noise ratio according to the target audio and sends the wake-up voice signal-to-noise ratio to a central control device so as to indicate the central control device to determine a nearby terminal of the user according to wake-up voice signal-to-noise ratios sent by at least one terminal and send a wake-up permission instruction to the nearby terminal; and if the target terminal responds to the user if receiving the wake-up permission instruction. According to the method provided by the embodiments of the invention, the wake-up voice signal-to-noise ratio is used as the selection basis of the nearby terminal, and calculation complexity is relatively low. The methodhas higher accuracy compared with a method judging the energy value of a wake-up audio; the wake-up voice signal-to-noise ratio is only needed to feed back to the central control device; requirementson the stability of a network are relatively low; the real-time performance of the method is relatively good; and user experience is improved.

The invention discloses a mechanical stirring solution supply electrostatic spinning device. The mechanical stirring solution supply electrostatic spinning device comprises a container, a stirring impeller, a driving system, collecting devices and a power source. The stirring impeller is arranged in the container. The driving system can drive the stirring impeller to rotate around the axis so that a spinning solution or melt in the container can be stirred to form swirls. The container is provided with a side wall surrounding the stirring impeller, a solution storage cavity is formed inside the side wall, jet flow holes are formed in the portion, above the stirring impeller, of the side wall, and the collecting devices right face the jet flow holes. An electric field needed for jet flow generation can be formed by the power source between the collecting devices and the jet flow holes. The swirling phenomenon is applied to the spinning device, the spinning solution or melt can climb along the wall of the container under the action of stirring centrifugal force, if the jet flow holes are located in the high-voltage electric field, the jet flow holes can generate Taylor cones and form jet flows, the consumed spinning solution can be constantly implemented by the climbing spinning solution, and therefore continuous and automatic solution supply is achieved. Due to the fact that stable, continuous and automatic solution supply can be achieved, large-scale industrial production of nanofilms is facilitated.

The invention discloses a resistance high-precision measuring system and method with combination of a differential method and a proportion method. The system comprises a constant current source, a reference resistor, a first differential amplifier, a programmable gain amplifier, an analog-to-digital converter, a microprocessor, a digital-analog converter and a measured resistor interface, the measured resistor interface is connected to a measured resistor, the reference resistor and the measured resistor are connected in series to form a serial connection branch circuit connected between the constant current source and the ground, two input terminals of the first differential amplifier are respectively connected with two terminals of the reference resistor, an output terminal of the firstdifferential amplifier is connected with a voltage reference terminal of the analog-to-digital converter, a first input terminal of the programmable gain amplifier is used for being connected to a to-ground single-end voltage of the measured resistor, a second input terminal of the programmable gain amplifier is connected with an analog output terminal of the digital-to-analog converter or the ground in a controlled manner, an output terminal of the programmable gain amplifier is connected with an analog input terminal of the analog-to-digital converter, and digital output terminals of the analog-to-digital converter and the digital-to-analog converter are both connected with the microprocessor. According to the system, the influence of power supply fluctuation can be overcome, the cost islow, and the measuring precision is high.