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35results about How to "Reduce background noise distractions" patented technology
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Signal modulation and demodulation device and method in space X-ray communication
ActiveCN108494499AEfficient identificationIncrease transfer rateElectromagnetic transmission non-optical aspectsDiscriminatorX-ray
The invention discloses a signal modulation and demodulation device and method in space X-ray communication. Information is coded and modulated into high and low levels. The high and low levels are input into a magnetic field generation device to generate a modulation magnetic field. Electrons in a multi-target material X-ray tube bombard different target materials to generate characteristic X rays. The characteristic X rays are emitted. Characteristic X-ray photons with different energy are taken as information carriers. The information carriers are received by an X-ray detector. Detection signals pass a preamplifier and then are input into an energy discriminator. Energy discrimination is carried out on the characteristic X-ray photons. The characteristic X-ray photons are counted by counters. A count comparator compares characteristic photon count. A signal demodulation circuit demodulates the signals and outputs the signals. According to the device and the method, code elements areloaded through utilization of the characteristic X rays with different energy. The characteristic photon energy is discriminated at a receiving end. The higher the loaded code element number is, thehigher the characteristic photon intensity is. The background noise interference can be reduced. The device and the method are characterized by a high communication rate and a low bit error rate.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Volume adjusting method for digital audio signal
InactiveUS20110184540A1Reduce background noise interferingReduce background noise distractionsGain controlVolume compression/expansion in untuned/low-frequency amplifiersVIT signalsBackground noise
A method for adjusting the volume of a digital audio signal includes detecting a level in accordance with an audio input signal, determining a gain value in accordance with the detected level, and outputting an audio output signal in accordance with the gain value and the audio input signal. Accordingly, weak audio signals such as background noise in silent periods may be compressed to reduce interference to the human listening experience during such silent periods.
Owner:HIMAX MEDIA SOLUTIONS
Calibration device and calibration method for equivalent self noise acceleration spectrum level of low-noise vector hydrophone
InactiveCN106124025AReduce background noiseLow test frequencyWave based measurement systemsVibration measurement in fluidLow noiseTwo-vector
The invention provides a calibration device and a calibration method for the equivalent self-noise acceleration spectrum level of a low-noise vector hydrophone. It is mainly composed of underwater acoustic tube, vacuum tube, electromagnetic shielding tube, vibration-damping base and upper cover. The noise self-spectrum measured by each vector hydrophone includes the self-noise spectrum and the environmental background noise spectrum, and the cross-correlation calculation of the noise signals of the two vector hydrophones can obtain the environmental background noise spectrum, and then through the known vector hydrophone The transfer function of the earphone can be calculated to obtain the equivalent self-noise acceleration spectrum level of the respective vector hydrophones. The present invention effectively reduces external vibration, electric, electromagnetic and acoustic interference, makes the background noise of the test environment extremely low, and thus better satisfies the calibration accuracy of the equivalent self-noise acceleration spectrum level parameters of the low-noise vector hydrophone It improves the evaluation effectiveness of the self-noise level of the low-noise vector hydrophone, and ensures the engineering application quality of the low-noise vector hydrophone.
Owner:HARBIN ENG UNIV
Aerial image-based power transmission line detection method
ActiveCN107341470AAccurate detectionEfficient detectionScene recognitionFeature vectorHough transform
The invention discloses an aerial image-based power transmission line detection method. The method comprises the following steps of firstly obtaining two-dimensional enhanced matrix eigenvalue and eigenvector corresponding to each pixel point by utilizing a Hessian matrix, and according to relationships between eigenvalues and eigenvectors, obtaining edge information of an aerial image; secondly according to a power transmission line distribution characteristic in the aerial image, proposing a simplified aerial image power transmission line distribution model; and performing block segmentation on the aerial image, obtaining a boundary of a power transmission line region, and obtaining a region segmentation coefficient; thirdly detecting a power transmission line by applying a Hough transform detection method to the image; and finally performing judgment by using a line spacing and a power transmission line slope, removing line segments not meeting the requirements, and reserving line segments meeting the requirements as a real power transmission line. The method is high in detection speed and high in detection precision, and can detect real power transmission line information in the aerial image with a complex background; by adopting the method, the problems of long consumed time and slow detection progress are solved; and the detection and identification rate of a power transmission line target in the aerial image is effectively increased.
Owner:STATE GRID ZHEJIANG ELECTRIC POWER +1
An image synergy significance detection method based on energy optimization
ActiveCN109472259AConsistent highlighting of salient targetsSalient target highlightingCharacter and pattern recognitionPattern recognitionSaliency map
The invention discloses an image synergy significance detection method based on energy optimization, relates to the field of image data processing, fuses three important significance clues, optimizesa fused energy equation, and comprises the following steps: inputting an image group {I1, I2,..., In}, and carrying out preprocessing; Determining an initial candidate simple saliency map (shown in the description), and calculating an initial collaborative saliency map (shown in the description); and calculating an initial collaborative saliency map (shown in the description). setting a simple image Isim according to the formula shown in the specification, wherein the formula shown in the specification is shown in the specification; Respectively extracting color features of the foreground areaand the background area of the simple image; And completing image synergy significance detection. According to the method, the defects of complex manual marking, too much background noise and targetmissing in the prior art are overcome.
Owner:HEBEI UNIV OF TECH
Camshift algorithm for tracking centroid correction model on the basis of Grabcut and LBP (Local Binary Pattern)
ActiveCN105046721AIncrease contrastRemove background noiseImage enhancementImage analysisGrabCutBackground noise
The invention discloses a Camshift algorithm for tracking a centroid correction model on the basis of Grabcut and an LBP (Local Binary Pattern). A target object is separated from an environment through the constant value enhancement tracking of a video stream and Grabcut foreground segmentation to cause the Camshift to obtain a pure histogram. Meanwhile, a Kalman filter assists the Camshift to predict a target movement locus. During a tracking period, carrying out LBP transform on an image in a target frame to obtain a template and current LBP histogram data, a judgment coefficient and a frame body change situation are obtained through comparison, and an S-Grabcut algorithm is executed if the target object is blocked by an object with a similar color, a centroid is removed, and normal tracking is continuously carried out. Compared with a traditional Camshift algorithm, the algorithm disclosed by the invention reduces the interference of background noise to a large extent, and the problem of quick movement and blocking is solved since the Kalman filter is added. Meanwhile, interference brought by the blocking of the object with the similar color can be favorably solved by the centroid correction model. Experiment results indicate that the algorithm has good robustness, meets the requirements of instantaneity and accuracy in tracking and causes the target to be more stably tracked under a complex environment.
Owner:NANCHANG UNIV
Paper-chromatography chemiluminescent detection method
InactiveCN107449906AImprove capture binding capacityReduce background noise distractionsChemiluminescene/bioluminescenceSolid phasesBinding ability
The invention discloses a combined chemiluminescent detection kit and a detection method. The combined chemiluminescent detection kit comprises a specific conjugate of a to-be-detected substance, a microparticle, a solid-phase film, a chemiluminescent reagent, a centrifugal device and a luminescent detector, wherein the chemiluminescent reagent comprises at least one selected from a group consisting of a chemiluminescent enzyme, a chemiluminescent substance, a chemiluminescent enzyme reaction substrate and a starting luminescent reagent; the microparticle is a particle capable of specifically binding to a protein and / or the chemiluminescent reagent in a direct binding and / or chemically crosslinking way and maintaining stable; the solid-phase membrane is a membranous substance having the characteristic of non-specific binding to a protein; the centrifugal device is a structure capable of centrifugally driving chromatographic flowing of a liquid phase on the solid-phase membrane; and the specific conjugate of the to-be-detected substance is at least one selected from a group consisting of antigen, antibody, avidin, biotin and analogue thereof with specific binding ability. The combined chemiluminescent detection kit and the detection method in the invention have the characteristics of high sensitivity and short detection time, and have good application prospects.
Owner:BEIJING KANGHUAYUAN SCI TECH CO LTD
Intelligent flame detection method and device, detector and storage medium
ActiveCN111105587AExtend your lifeImprove reliabilityFire alarm radiation actuationFlame detectionEngineering
The invention discloses an intelligent flame detection method and device, a detector and a storage medium. The method comprises the steps: obtaining an infrared dynamic signal and an ultraviolet dynamic signal in a certain period of sampling time, and carrying out the quantification of the infrared dynamic signal and the ultraviolet dynamic signal, and obtaining an infrared dynamic signal quantification value and an ultraviolet dynamic signal quantification value; calculating dynamic signal average intensity and dynamic signal discreteness in the mt time window according to the infrared dynamic signal quantification value and the ultraviolet dynamic signal quantification value, and counting discreteness count; obtaining a dynamic signal characteristic value according to the dynamic signalaverage intensity and the dynamic signal discreteness in the mt time window; and if the discreteness count is greater than or equal to the effective count threshold and the difference between the dynamic signal characteristic value and the background noise signal characteristic value is greater than or equal to the identification signal characteristic value threshold, identifying the flame and outputting a flame alarm signal. Background noise interference can be eliminated in a self-adaptive manner, false alarm is prevented, and the reliability of flame detection alarm is improved.
Owner:广州思瑞智能科技有限公司
Reference signal constraint-based mechanical characteristic acoustic signal frequency-domain semi-blind extraction method
ActiveCN104568132AWith non-contact measurementWith online testMachine part testingSubsonic/sonic/ultrasonic wave measurementSemi blindMechanical equipment
The invention relates to a reference signal constraint-based mechanical characteristic acoustic signal frequency-domain semi-blind extraction method, and belongs to the technical field of operation maintenance of mechanical equipment. The method comprises the following steps: constructing a multi-scale morphology filter for a failure signal characteristic on the basis of a dynamic particle swarm algorithm with higher global optimization capability, and maximally weakening background noise interference; constructing a reference signal in combination with structural parameters of a mechanical part, and further performing complex component blind separation band by band by virtue of a unit reference signal constraint semi-blind extraction method; solving order uncertainty problems to obtain a separated and restored source signal to finally realize the extraction and separation of the mechanical failure characteristic signal by virtue of the improved KL distance between complex components. Different from vibration monitoring requiring the mounting of a sensor on the surface of mechanical equipment, acoustic monitoring only requires the placement of 1 to 2 microphones around the equipment, and then the failure characteristic signal can be extracted from a picked up mechanical acoustic signal for further failure source positioning.
Owner:KUNMING UNIV OF SCI & TECH
Water surface oil pollution monitoring system and method based on unmanned aerial vehicle platform
InactiveCN110646390AHigh precisionReduce false alarm rateCharacter and pattern recognitionFluorescence/phosphorescenceInformation processingUncrewed vehicle
The invention proposes a water surface oil pollution monitoring system and method based on an unmanned aerial vehicle platform, and is used for solving the technical problem of lower monitoring accuracy in the prior art. The monitoring system comprises a ground processing terminal, an information acquisition module and an information processing module mounted on the unmanned aerial vehicle platform. The method of the monitoring system comprises the following steps of cruising over the water surface of a monitoring area by an unmanned aerial vehicle; acquiring fluorescence information and imageinformation by the information acquisition module; processing and transmitting the fluorescence information and the image information by the information processing module; analyzing fluorescence dataand image data by the ground processing terminal; and interactively displaying the fluorescence data, the image data, a judging result and early warning information by the ground processing terminal.According to the water surface oil pollution monitoring system and the method based on the unmanned aerial vehicle platform provided by the invention, a fluorescence monitoring technology and an image monitoring technology are combined, the monitoring accuracy is improved, and the false alarm rate of the system is reduced.
Owner:昆山智易知信息科技有限公司
Centrifugal separation immunochromatography detection method and device
InactiveCN107525923AReduce background noise distractionsImprove capture binding capacityBiological testingFluid phaseEngineering
The invention discloses a centrifugal separation immunochromatography detection method. Based on the characteristic that a centrifugal device is utilized for driving a liquid phase to flow in a solid-phase detection film based on an existing immunochromatography technique, the method can be applied to a colloid metal immunochromatography detection method, a fluorescence immunochromatography detection method and a chemiluminiscence immunochromatography detection method. The method has the characteristics of high sensitivity, short detection time, convenience in use, high stability and convenience in storage.
Owner:BEIJING KANGHUAYUAN SCI TECH CO LTD
Bird sound recognition system and recognition method
ActiveCN111276151AListening to Mixed Voice MessagesRealize TrackingSpeech analysisHigh level techniquesSound sourcesFrequency sound
The invention discloses a bird sound recognition system and recognition method, and the system employs a specific directional reception method to achieve the high-precision tracking and recognition ofa target bird sound, reduces the range of a received sound source, can reduce the background noise interference to a greater degree, improves the detection and recognition precision, and achieves theprecise positioning and recognition. The sound spectrum rate aiming at bird sounds is higher, bird sound has the characteristic that a plurality of short high-pitch continuous or discontinuous high-frequency sounds are produced, a subsequent enhancement processing scheme is specified, and high-precision respective identification processing can be realized by utilizing a neural network model, so that the bird sound identification precision is remarkably improved, and a good technical support is provided for bird population research.
Owner:北京正和恒基滨水生态环境治理股份有限公司
Centrifugation chromatography fluoroimmunoassay detection method and applications thereof
InactiveCN107543922AImprove capture binding capacityReduce background noise distractionsFluorescence/phosphorescenceSolid phasesRare-earth element
The invention discloses a fluorescence detection kit, and a detection method. The fluorescence detection kit comprises a substance capable of realizing specific binding with a substance to be detected, particles, a solid phase membrane, a fluorescent substance, a centrifugation device, and a fluorescence detector; wherein the fluorescent substance comprises at least one selected from an organic fluorescent dye and a rare earth element fluorescent dye; the particles are capable of realizing nonspecific binding with protein and / or the fluorescent substance directly and / or via chemical crosslinking, and maintaining stability; the solid state membrane is a membrane substance capable of realizing nonspecific binding with protein; the centrifugation device is capable of realizing centrifugationdriving of chromatography and flowing of a liquid phase on the solid phase membrane; and the substance capable of realizing specific binding with the substance to be detected is at least one selectedfrom an antigen, an antibody, an avidin, a biotin, and an analog with specific binding capacity. The detection method is high in sensitivity and stability, short in detection time, and promising in application prospect.
Owner:BEIJING KANGHUAYUAN SCI TECH CO LTD
Centrifugal chromatography colloidal gold immunodetection technology and application thereof
InactiveCN107561281AImprove capture binding capacityReduce background noise distractionsMaterial analysisAntigenSolid phases
The invention discloses a centrifugal chromatography colloidal gold immunodetection set. The detection set is characterized by containing a to-be-detected substance specific binder, colloidal gold particles, a solid phase membrane, a centrifugal device and a colloidal gold detector, wherein the colloidal gold particles are prepared from a gold solution and can be non-specifically bond with proteindirectly and kept stable; the solid phase membrane is a membrane substance with the characteristic of nonspecific binding with protein; the centrifugal device is a structure capable of centrifugallydriving a liquid phase to realize chromatographic flow on the solid phase membrane; the to-be-detected substance specific binder is at least one of an antigen, an antibody, avidin, biotin and analogues thereof with specific binding capacity; the colloidal gold detector performs quantitative or semi-quantitative detection through colorimetric analysis of the color of colloidal gold. The set has thecharacteristics of high sensitivity, good stability and short detection time and has bright application prospects.
Owner:BEIJING KANGHUAYUAN SCI TECH CO LTD
Rolling bearing sound signal multiband fusion fault diagnosis method based on RLS and RSSD
ActiveCN112926014AReduce the impactRemove distortionMachine part testingSustainable transportationNoiseEngineering
The invention discloses a rolling bearing sound signal multiband fusion fault diagnosis method based on RLS and RSSD. The rolling bearing sound signal multiband fusion fault diagnosis method comprises the following steps that firstly, a bearing operation sound signal is subjected to dereverberation processing through an RLS algorithm; secondly, noise reduction processing is conducted on low-frequency signals and high-frequency signals in the reverberation-removed signals through a resonance sparse decomposition method based on the optimal quality factor and a wavelet noise reduction algorithm; the signal amplitudes of the two frequency bands are compared, and the signals are amplified and superposed to complete signal reconstruction; and finally, the bearing fault is judged through envelope spectrum analysis. According to the method, the interference of noise and reverberation on the bearing signals is reduced, the weak bearing signals are extracted through a multi-band noise reduction method, and compared with an existing acoustic diagnosis method which is based on a single band and does not consider the reverberation influence, the method has the advantages of being good in noise suppression effect, small in signal effective information loss, high in diagnosis precision and the like. The method can accurately identify bearing faults, and is suitable for acoustic diagnosis of rolling bearings.
Owner:BEIJING UNIV OF CHEM TECH
Automatic detection system for transparent bottle
InactiveCN110865081AImprove light concentratingIncrease brightnessOptically investigating flaws/contaminationImage resolutionRadiology
The invention discloses an automatic detection system for a transparent bottle. The automatic detection system comprises the followings: an optical illumination system providing uniform illumination for an image acquisition system, the image acquisition system collecting a surface image of the transparent bottle and outputting a video signal from a system unit for processing by an image processingunit; and an image processing software system segmenting and positioning a defect area, detecting and judging the transparent bottle, and sending a removal signal for an unqualified product. The automatic detection system not only improves the view angle of a lens, increases a shooting range and improves imaging resolution, but also reduces a calculation process through image segmentation, thereby greatly improving the accuracy and speed of detection.
Owner:DONGGUAN XIANGFEI INTELLIGENT EQUIP TECH CO LTD
Buccal mute communication method and system
ActiveCN110956949AReduce background noise distractionsImprove confidentialityParticular environment based servicesNeural architecturesInterference (communication)Confidentiality
The invention discloses a buccal mute communication method and a system. The method comprises the following steps: collecting an intraoral first signal and an intraoral second signal; determining vibration characteristic information according to the intraoral first signal, and determining form position information according to the intraoral second signal; determining voice information by using a voice prediction model according to the vibration characteristic information and the form position information; and synthesizing a voice by means of the voice information. By collecting the first signal in the mouth and the second signal in the mouth, the vibration characteristic information is determined according to the first signal in the mouth, and the form position information is determined according to the second signal in the mouth, so that the background noise interference can be reduced, the confidentiality is high, and no trauma is caused; the voice prediction model is used, the voiceinformation is determined according to the vibration characteristic information and the form position information, the voice is synthesized by using the voice information, the learning cost is low, the use is convenient and the comfort is high.
Owner:NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI +1
Multi-sensor mixed fault signal blind separation method based on edge calculation and machine learning
PendingCN113343887AReduce background noise interferenceEffective and precise extractionSubsonic/sonic/ultrasonic wave measurementSpeech analysisFeature (machine learning)Electrical and Electronics engineering
The invention discloses a multi-sensor mixed fault signal blind separation method based on edge calculation and machine learning, and the method comprises the following steps: determining the number and positions of observation fault signals according to the number of existing faults, and collecting the observation signals through a signal collection device; preprocessing the collected mixed signal to obtain a preprocessed aliasing fault signal; separating the aliasing fault signals by adopting an independent component blind separation algorithm to obtain multiple paths of separated independent fault signals; performing normalization processing on the separated fault signals, performing spectrum and wavelet analysis, and extracting fault feature signals; and diagnosing and discriminating each extracted single fault characteristic signal. According to the invention, possible coexistence fault feature signals are effectively separated, complex coexistence fault diagnosis is converted into single fault diagnosis, the diagnosis efficiency and precision of composite faults can be greatly improved, powerful technical support is provided for safe operation and maintenance of mechanical equipment, and the prevention and treatment capacity for accidents is effectively improved.
Owner:CHENGDU RUIBEI YINGTE INFORMATION TECH CO LTD
Target tracking method and system based on multi-feature and self-adaptive dictionary learning
InactiveCN109523587AReduce background noise distractionsReduce distractionsImage analysisDictionary learningSelf adaptive
The invention discloses a target tracking method and system based on multi-feature and adaptive dictionary learning, and the method comprises the steps: obtaining a foreground template of a first frame image at an initial position of a target and a surrounding background template of the target; Constructing an initial dictionary according to the target foreground template and a target surroundingbackground template, and obtaining an initial texture feature dictionary and an initial color feature dictionary; according to the LC-KSVD algorithm, Performing learning processing on the initial texture feature dictionary and the initial color feature dictionary by using a KSVD algorithm to obtain a discriminant texture feature dictionary and a discriminant color feature dictionary; And performing target position tracking matching based on a sparse feature matching algorithm according to the discriminant texture feature dictionary and the discriminant color feature dictionary to obtain a tracking position of a next frame of the target. In the embodiment of the invention, by utilizing the discrimination dictionary, the representation capability of the target appearance can be supplemented,background noise interference is reduced, and the tracking precision is improved.
Owner:GUANGDONG POLYTECHNIC NORMAL UNIV
Centrifugal separation detection device and application thereof
ActiveCN107688089AReduce background noise distractionsImprove capture binding capacityMaterial analysisElectric machineryEngineering
The invention discloses a centrifugal separation detection device. The centrifugal separation detection device comprises a sample feeding part, a solid phase membrane, a centrifugal device and a detector, wherein the centrifugal device comprises a centrifugal rotor and a support base; the centrifugal rotor is driven by a drive motor, and is supported by the support base; the sample feeding part isnot directly connected with the centrifugal rotor, and is arranged above, under or outside the centrifugal rotor; the sample feeding part comprises a liquid phase storage device, a sample feeding pipe and a sample feeding pump; the liquid phase storage device is communicated with the sample feeding pipe; the sample feeding pump is used for driving liquid in the liquid phase storage device to enter the sample feeding pipe; the solid phase membrane is arranged on the centrifugal rotor, and a liquid phase sample is directly or indirectly loaded onto one side, near the center, of the solid phasemembrane by the sample feeding pipe; the detector is not directly connected with the centrifugal rotor, and is arranged above, under or outside the centrifugal rotor. The centrifugal separation detection device is characterized in that the sensitivity is high, and the full-quantitative and automatic effects are realized; the detection technology with quick detection and simple used equipment is adopted, and the good application prospect is realized.
Owner:CHANGZHOU BIOWIN BIOPHARM
A frequency-domain semi-blind extraction method of mechanical characteristic acoustic signals based on reference signal constraints
ActiveCN104568132BWith non-contact measurementWith online testMachine part testingSubsonic/sonic/ultrasonic wave measurementSemi blindMechanical equipment
The invention relates to a reference signal constraint-based mechanical characteristic acoustic signal frequency-domain semi-blind extraction method, and belongs to the technical field of operation maintenance of mechanical equipment. The method comprises the following steps: constructing a multi-scale morphology filter for a failure signal characteristic on the basis of a dynamic particle swarm algorithm with higher global optimization capability, and maximally weakening background noise interference; constructing a reference signal in combination with structural parameters of a mechanical part, and further performing complex component blind separation band by band by virtue of a unit reference signal constraint semi-blind extraction method; solving order uncertainty problems to obtain a separated and restored source signal to finally realize the extraction and separation of the mechanical failure characteristic signal by virtue of the improved KL distance between complex components. Different from vibration monitoring requiring the mounting of a sensor on the surface of mechanical equipment, acoustic monitoring only requires the placement of 1 to 2 microphones around the equipment, and then the failure characteristic signal can be extracted from a picked up mechanical acoustic signal for further failure source positioning.
Owner:KUNMING UNIV OF SCI & TECH
Preparation and application of mitochondrial fluorescent dye 3-heteroaryl substituted-2h-indazole derivatives
InactiveCN104910139BGood fluorescenceDeep penetrationOrganic chemistryFluorescence/phosphorescenceSynthesis methodsCell membrane
The invention relates to a synthesis method and an application of 3-heteroaryl substituted-2H-indazole derivatives for specifically labeling mitochondria. The 3-heteroaryl substituted-2H-indazole derivatives can be used for specifically labeling mitochondria to realize fluorescence imaging. A fluorescence emission spectrum of the derivatives can reach to an infrared / near infrared area, the maximum Stokes displacement can reach 178nm, and the derivatives have the advantages of very small molecular weight, small size, easy penetration of cell membranes and entrance to cells, good light stability and small cytotoxicity. The preparation method is characterized in that the 3-heteroaryl substituted-2H-indazole derivatives are obtained through a C-H / C-H direct oxidative cross-coupling reaction of 2H-indazole derivatives and electron-rich heterocycles under the catalysis of a transition metal. Compared with traditional C-X / C-M coupling and other methods, the method provided by the invention has the advantages of avoiding of tedious pre-activation processes of a substrate, improvement of the function group tolerance, simple reaction conditions, synthesis step simplification, total yield increase and cost reduction. Compared with preset expensive commercial mitochondrial labeling reagents, the 3-heteroaryl substituted-2H-indazole derivatives have high market competitiveness.
Owner:SICHUAN UNIV
Flexible solar blind ultraviolet detector and preparation method thereof
ActiveCN108538927ASimple preparation processImprove flexibilityFinal product manufacturePhotovoltaic energy generationUltraviolet detectorsBlind zone
The invention provides a flexible solar blind ultraviolet detector. The flexible solar blind ultraviolet detector is characterized by comprising a transparent substrate, a graphene mesh layer and a ZnS quantum dot layer that are arranged in order from bottom to top. The graphene mesh layer is formed by graphene meshes after graphene etching. The flexible solar blind ultraviolet detector has the beneficial effects: the preparation process is simple; flexibility is high; and large-area application is realized. The prepared flexible solar blind ultraviolet detector has high response to the ultraviolet light in the solar blind zone and the low response to light beyond the solar blind zone, so that the influence of background interference is reduced. In addition, the invention also provides a preparation method of a flexible solar blind ultraviolet detector.
Owner:太谱(苏州)纺织科技有限公司
Audio adapter for conversation in prison
InactiveCN107046661AReduce distractionsImprove clarityTransducer circuitsBreathy voiceImpedance matching
The invention discloses an audio adapter for conversation in a prison. The audio adapter comprises an audio input module, an audio amplifying module, an impedance matching module, and an audio output module, wherein the audio input module is used for inputting an audio signal; the audio amplifying module is used for amplifying the input audio signal, and transmitting the amplified audio signal to the impedance matching module; the impedance matching module is used for performing smooth processing on the amplified audio signal, and transmitting the smoothly processed audio signal to the audio output module; and the audio output module is used for outputting the smoothly processed audio signal. The audio adapter for the conversion in the prison disclosed by the invention can effectively adapt to a video-audio compression card in a prison helping-educating system, the noise interference is reduced, and the sound articulation is improved.
Owner:SHANDONG ZHONGCI ROMOTE VIDEO TECH
A multi-channel evanescent wave all-fiber biosensor
ActiveCN106990086BSimple structureReduce volumeFluorescence/phosphorescenceOptical fiber probeMaterials science
The invention relates to a multi-channel evanescent wave all-optical fiber biosensor. The biosensor is characterized in that it comprises a flow sample injection system, an optical system and a control circuit and signal processing system; laser emitted by a semiconductor laser unit is collimated and then divided into a plurality of light beams, each light beam is emitted by a corresponding all-optical fiber system to a corresponding sample pool, each optical fiber probe produces fluorescence after excitation, the generated fluorescence signals are collected and filtered by all-optical fiber systems and are then emitted to a photoelectric detector group, the photoelectric detector group converts the collected fluorescence signals of all the optical fiber probes' surfaces into current signals, multi-channel current signals are processed by a micro-signal simulation preamplifier and a multi-channel lock-in amplifier and then sent to a computer, thus realizing simultaneous quantitative analysis of a sample's multiple indexes; and the computer is also connected to a cooperative control module through a parallel processing module, the parallel processing module is also connected to the semiconductor laser unit through a pulse signal generator, and the cooperative control module is in parallel connection with a peristaltic pump and a ten-position valve.
Owner:RENMIN UNIVERSITY OF CHINA
Signal modulation and demodulation device and method in space x-ray communication
ActiveCN108494499BEfficient identificationIncrease transfer rateElectromagnetic transmission non-optical aspectsInterference (communication)Software engineering
The invention discloses a signal modulation and demodulation device and method in space X-ray communication. Information is coded and modulated into high and low levels. The high and low levels are input into a magnetic field generation device to generate a modulation magnetic field. Electrons in a multi-target material X-ray tube bombard different target materials to generate characteristic X rays. The characteristic X rays are emitted. Characteristic X-ray photons with different energy are taken as information carriers. The information carriers are received by an X-ray detector. Detection signals pass a preamplifier and then are input into an energy discriminator. Energy discrimination is carried out on the characteristic X-ray photons. The characteristic X-ray photons are counted by counters. A count comparator compares characteristic photon count. A signal demodulation circuit demodulates the signals and outputs the signals. According to the device and the method, code elements areloaded through utilization of the characteristic X rays with different energy. The characteristic photon energy is discriminated at a receiving end. The higher the loaded code element number is, thehigher the characteristic photon intensity is. The background noise interference can be reduced. The device and the method are characterized by a high communication rate and a low bit error rate.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
An Objective Evaluation Method of Diesel Engine Impulse Noise
ActiveCN109781245BReduce background noise distractionsImprove consistencyInternal-combustion engine testingSubsonic/sonic/ultrasonic wave measurementNoiseEngineering
The invention relates to the technical field of diesel engine starting, in particular to an objective evaluation method for pulse noise of a diesel engine. The method comprises the following specificsteps: 1, respectively filtering a certain sound signal by adopting 24 groups of critical frequency band filters within the range of 20-16000Hz to obtain 24 groups of sound pressure signals, calculating the time-varying characteristic loudness of each group of signals under the condition that frequency domain and time domain masking effects are considered, and finally obtaining 24 groups of characteristic loudness time sequences, called uncompressed signals for short, of the sound signal within 24 critical frequency bands; 2, dividing the pulse sound calculation and identification process intotwo parallel signal processing processes, namely a log2 compressed signal pulse relative amplitude pickup process and a non-compressed signal pulse absolute amplitude pickup process; and 3, calculating a pulse index. An objective evaluation method is provided for the pulse noise of the diesel engine, and the method not only can calculate the total impulse index of the engine noise, but also can analyze the contribution degree of the pulse indexes of critical frequency bands of the pulse noise.
Owner:JIANGLING MOTORS
Camshift algorithm based on grabcut and lbp tracking centroid correction model
ActiveCN105046721BReduce background noise distractionsGood effectImage enhancementImage analysisGrabCutBackground noise
The invention discloses a Camshift algorithm for tracking a centroid correction model on the basis of Grabcut and an LBP (Local Binary Pattern). A target object is separated from an environment through the constant value enhancement tracking of a video stream and Grabcut foreground segmentation to cause the Camshift to obtain a pure histogram. Meanwhile, a Kalman filter assists the Camshift to predict a target movement locus. During a tracking period, carrying out LBP transform on an image in a target frame to obtain a template and current LBP histogram data, a judgment coefficient and a frame body change situation are obtained through comparison, and an S-Grabcut algorithm is executed if the target object is blocked by an object with a similar color, a centroid is removed, and normal tracking is continuously carried out. Compared with a traditional Camshift algorithm, the algorithm disclosed by the invention reduces the interference of background noise to a large extent, and the problem of quick movement and blocking is solved since the Kalman filter is added. Meanwhile, interference brought by the blocking of the object with the similar color can be favorably solved by the centroid correction model. Experiment results indicate that the algorithm has good robustness, meets the requirements of instantaneity and accuracy in tracking and causes the target to be more stably tracked under a complex environment.
Owner:NANCHANG UNIV
Centrifugal separation detection method
InactiveCN109387628AReduce background noise distractionsImprove capture binding capacityMaterial analysisFluid phaseTest sample
The invention discloses a centrifugal separation detection method. The method comprises the steps of: a liquid phase is driven by a centrifugal device to flow through a solid phase membrane, wherein the liquid phase comprises a to-be-tested sample containing a to-be-tested substance and a detection phase, the detection phase is a substance containing a detection indicator capable of directly or indirectly specifically binding to the to-be-tested substance; when the liquid phase flows through the solid phase membrane, the liquid phase is combined with to-be-tested substance specific conjugate coating the solid phase membrane to form a detection indicator-to-be-tested substance-to-be-tested substance specific conjugate complex, the detection indicator-to-be-tested substance-to-be-tested substance specific conjugate complex is captured and immobilized on the solid phase membrane, and a detector detects the amount of the detection indicator indirectly fixed to the solid phase membrane to detect the amount of the to-be-tested substance. The centrifugal separation detection method has the characteristics of high sensitivity and short detection time.
Owner:BEIJING KANGHUAYUAN SCI TECH CO LTD
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