72results about How to "Non-intrusive" patented technology

The invention provides a user identity identification method based on a Wi-Fi signal. A Wi-Fi transmitter, a signal receiver and a terminal device are comprised. The method is characterized in that the method comprises the steps that the Wi-Fi transmitter transmits the Wi-Fi signal; the signal receiver receives the Wi-Fi signal to acquire channel state information; the channel state information changes when a human body passes; and the terminal device carries out denoising processing on the channel state information data, extracts the shape feature of a line-of-sight waveform, and carries out classifying by matching and comparing the shape feature of a line-of-sight waveform to acquire an identification result. The method based on the Wi-Fi signal has the advantages of device independence, privacy protection, intrusion prevention and the like compared with existing methods of using cameras, radars and wearable devices.

The invention relates to a human face collecting method at a distance, belongs to the image processing field, and aims to solve the problems that human face collecting distance is not far and friendliness in a collecting process is not enough in the existing human face collecting technology. Human face collecting devices comprise a personal computer (PC), a binocular camera, a two degree-of-freedom rotating pan tilt and a telephoto camera, wherein the telephoto camera is arranged on the two degree-of-freedom rotating pan tilt. The human face collecting method at a distance includes that the PC adjusts the two degree-of-freedom rotating pan tilt according to a three-dimensional coordinate of a target human face collected by the binocular camera so as to drive the telephoto camera to align to the target human face direction and to collect video information of the target human face; if the video information is a front face, then the front face is adjusted to the central area of the current video frame image to finish the collection, and the sharpness is adjusted; and if the video information is not a front face, the collection is repeated.

The invention discloses a method and a system for measuring a polymer melt temperature field based on capacitance tomography. The method comprises the following steps of: measuring a capacitance value of a capacitance pole plate of a capacitance type polymer melt temperature field sensor, which is calibrated; according to a capacitance tomography image reconstruction algorithm, reconstructing polymer melt dielectric constant distribution based on the measured capacitance value; establishing a relationship model of polymer melt dielectric constant and temperature; and according to the relationship model, converting the polymer melt dielectric constant distribution into the corresponding polymer melt temperature field. By the invention, the polymer melt temperature acquisition ability of a person is improved, the method is superior to the conventional partial single-point measurement mode, the problem of difficulty in measurement of the polymer melt temperature field in the conventional temperature measurement method is solved, and the method has the advantages of non-invasiveness, high response speed, simple structure and the like.

The invention relates to a method for detecting the pulmonary artery blood pressure by using a heart sound analysis method of a multilayer feedforward network. The method comprises the steps of: extracting a heart sound signal; preprocessing the heart sound signal by fast Fourier transform and normalized average Shannon energy distribution to obtain heart sound signal features; filtering the heart sound signal features by using a principal component analysis method; and performing training learning on the filtered hear sound signal features by using a perceptron neural network or a multilayer perceptron feedforward neural network to obtain an optimal neural network between the heart sound signal features and a pulmonary artery blood pressure value. The heart sound signal features are signal features of a first heart sound and a second heart sound; the heart sound signal features comprise crest frequency, average frequency, crest amplitude, average amplitude, duration and time interface of heart sounds. By adopting the method for detecting the pulmonary artery blood pressure by using the heart sound analysis method of the multilayer feedforward network, provided by the invention, the pulmonary artery blood pressure can be easily and conveniently detected at low cost in a non-intrusive and no risk manner.

The invention discloses a second harmonic imaging method and a second harmonic imaging device for single suspended particles. According to the method, Bessel laser is adopted for effectively capturing the suspended particles, and remote noncontact and noninvasive capture and high capture efficiency are realized; imaging is realized by second harmonic signals generated on the particles by femtosecond laser, polarization resolution, spectral resolution and three-dimensional imaging are realized, and imaging and observation of fine particles are realized. The device for implementing the second harmonic imaging method has advantages that due to adoption of common optical devices, low cost is realized while imaging of the second harmonic signals can be well realized, and suitableness for popularization is achieved.

The invention discloses a device and a method for measuring parameters of gas-liquid two-phase flow in micro-pipes based on a thermal measurement method. The device comprises a measurement micro-pipe, temperature sensors, a signal conditioning circuit, a data collection system and a computer. The temperature sensors are respectively mounted at four positions of an internal insulation layer of the measurement pipe wall; a first thermal resistor is used for measuring the flow temperature before heating; a second thermal resistor is used for heating and measuring the flow temperature; and a third thermal resistor and a fourth thermal resistor are used for measuring the flow temperature after heating. The third thermal resistor and the fourth thermal resistor are used for correlative operation to obtain the flow velocity information; the first thermal resistor, the second thermal resistor and an outer circuit constitute a constant-temperature-different measurement circuit so as to analyze signals to obtain the porosity information; and finally, the volume of the two-phase flow can be calculated by derivation. The invention provides an effective way for solving the parameter measurement problem of the gas-liquid two-phase flow in the micro-pipe, and the related device has the advantages of simple structure, no invasion, low cost, and the like, and provides sufficient parameter information for the two-phase flow measurement.

The invention relates to a method for inverting concentration of suspended particulate matters based on acoustics; the method comprises: receiving a back-scattering signal of an underwater scattering body to obtain echo strength by using an acoustic Doppler current profiler; according to a sonic equation, correcting the echo strength by considering acoustic wave geometric attenuation and absorptive attenuation to obtain volume back-scattering strength; according to the corrected volume back-scattering strength, finally inverting the concentration of suspended particulate matters with high time-space resolution in accordance with Rayleigh scattering principle. The method can provide precise concentration of suspended particulate matters.

The present invention relates to an apparatus and method for detecting defect of carbon fiber composite based on an electromagnetic chromatography imaging technique in a mode of single-coil-excitationmulti-coil induction. The apparatus includes a module for generating and forming excitation signals, a module for amplifying current and driving excitation coil, a module for exciting and detecting coils, a module for sampling back, recuperating and amplifying induction signals, a signal collection board card and a PC machine. The method includes steps feeding an alternation drive current to theexcitation coil so as to induct an alternation excitation magnetic field, the defect of the carbon fiber composite board will change the distribution of the excitation magnetic field; according to electromagnetic induction principle, obtaining an amplitude and a phase of a signal, regenerating an image for reflecting the size and position of the defect in the carbon fiber composite board by an algorithm of regenerating an image through shadow cast, so as to implement a non-contact, non-interposition and rapid nondestructive detection to the carbon fiber composite.

The invention provides a self-adaptive snoring sound signal detection method, which comprises the following steps: 1, conducting endpoint detection on an acquired sleep audio signal so as to obtain a sound event; 2, extracting characteristics of the sound event obtained in the step 1, so that an Mel frequency cepstrum coefficient; and 3, clustering the characteristics extracted in the step 2, and determining snoring sound and non-snoring-sound signals. With the application of the detection method disclosed by the invention, the snoring sound signal in the sleep audio signal can be effectively detected out; and the detection method is accurate in detection result and excellent in performance.

The present application discloses a method and system for determining a Fresnel phase shift in an environment and a computer readable storage medium. The method comprises a step of allowing a receiving device R to receive a radio frequency signal from a transmitting device T, wherein the radio frequency signal comprises two or more carriers, a step of constructing a K layer Fresnel area of the two or more carriers with the position of the transmitting device T and the position of the receiving device R as ellipse focuses, a step of laying a reflection target in the environment such that the reflection target moves in the environment, a step of determining a theoretical Fresnel phase difference between different carriers caused by the reflection target for at least one carrier pair combination in the at least two carriers, a step of determining an actual Fresnel phase difference between different carriers caused by the reflection target and the environment for the at least one carrier pair combination in the at least two carriers, and a step of comparing the actual Fresnel phase difference and the corresponding theoretical Fresnel phase difference, and determining the Fresnel phase shift of the at least one carrier pair combination in the environment. The invention also discloses a method of carrying out indoor positioning based on the method for determining a Fresnel phase shift in an environment.

A measurement and judgment method for orthopedics diagnosis comprises the steps of providing bone resonant frequency and bone length as well as a correction parameter of a testee, and setting the resonant frequency, the bone length and the correction parameter into a formula for calculation to obtain the bone density of the bone. The correction parameter can be of a circumference parameter or a weight parameter. In the method, whether artificial coax joints are loosened is judged better through comparing the input fundamental frequency amplitude with the generated harmonic amplitude.

The invention discloses a control device of a charging pile based on face recognition and a control method of the charging pile based on the face recognition. A control circuit board of the control device of the charging pile based on the face recognition further identifies and extracts preprocessing standard information of a face image based on characteristics of Adaboost algorithm and outputs gray scale characteristic information of the face image. A local area network server compares the gray scale characteristic information of the face image with preset gray scale characteristic information, and outputs a comparison success signal or a comparison failure signal. The control circuit board triggers or shuts down a charging circuit of the charging pile according to the comparison success signal or the comparison failure signal. In the process of using the charging pile, users do not need to carry IC cards and other keys, so that the loss, degaussing and other problems of the IC cards are avoided. The control device of the charging pile based on the face recognition improves the reliability while facilitating use, and effectively prevents the IC cards from being cracked and copied and other security risks.

The invention discloses a detection method and device for internal defects of jujube fruits on the basis of visible/near-infrared spectrum. The detection method comprises the following steps of: (R1)sample preparation and spectrum information acquisition; (R2) establishment of a judgment model for the internal defects of the jujube fruits: adopting a model with the highest accuracy in judging theinternal defects of the jujube fruits as an optimum judgment model; (R3) using the optimum judgment model to judge the internal defects of the jujube fruits to be detected; (R4) recurrence of the internal defects of the jujube fruits to be detected. Proved by experiments, the detection method for the internal defects of the jujube fruits on the basis of the visible/near-infrared spectrum providedby the invention has the beneficial effects that the judgment accuracy for the internal defects of the jujube fruits can reach 96.77%; by acquisition of the visible/near-infrared spectrum informationof the jujube fruits, the judgment model for the internal defects of the jujube fruits is established for detecting the internal defects of the jujube fruits; the detection method and device have thecharacteristics of fastness and no damage.

The invention discloses an inertial separation microfluidic chip based on electrical impedance tomography (EIT) visual detection. The microfluidic chip is composed of a tube, a first electrode array set, a second electrode array set, and a third electrode array set. The first electrode array set is arranged in the inlet of the tube. The second electrode array set is arranged in the middle bend ofthe tube. The third electrode array set is arranged in the outlet of the tube. The electrodes of the first electrode array set, the second electrode array set, and the third electrode array set are all connected to a pin socket. The provided microfluidic chip has a simple structure, is suitable for detecting a high concentration solution, and is non-invasive. The pipeline is in a round shape, andthus has a higher detection precision, compared with a square pipeline.

The invention relates to a passive human body identification method based on narrowband radio frequency link sampling. The method comprises the following steps: collecting biological characteristic information generated by walking of a pedestrian to be identified through a plurality of radio frequency links, matching the biological characteristic information with a radio frequency signal receivingintensity sequence, fusing the radio frequency signal receiving intensity sequences of all the radio frequency links to obtain a fused radio frequency signal receiving intensity value vector; carrying out maximum likelihood probability estimation matching on the fusion radio frequency signal receiving intensity value vector and each Gaussian mixture model in an identity database, and carrying outidentity recognition on the to-be-recognized pedestrian according to an output probability value. According to the invention, biological characteristic information generated by walking of a pedestrian to be identified is sampled and acquired through the constructed multi-angle interleaved radio frequency links; forced cooperation and visual privacy invasion of a user in a limited environment areeffectively avoided, the dependence of correct recognition on illumination and different wearing clothes is remarkably reduced, and the advantages of being free of invasion, difficult to hide, difficult to camouflage and the like are achieved.

The invention discloses a long-range control method and data processing equipment used for realizing the same, which are not provided with invasion property and do not need a special port. The long-range control method is applied to the data processing equipment which comprises a first control unit and a second control unit, wherein the method comprises the steps of utilizing the first control unit to obtain keyboard, image and mouse signals from keyboard, video and mouse interfaces of controlled station equipment; transmitting the keyboard, image and mouse signals to the second control unit by the first control unit in a network or 3G communication mode; outputting and displaying the image and mouse signals by the second control unit. The mouse and keyboard signals are obtained through the mouse and keyboard interfaces by the first control unit, no invasion property exists, the controlled equipment is not collocated, and the worry of safety problem of a client is not caused. In addition, the signals are transmitted in the network or 3G communication mode, the existing network structure of the client is not changed, and simultaneously the client network is not independent of.

Disclosed is a method of determining in real-time an estimate value of a sound pressure level or sound exposure corresponding to sound produced in an acoustic environment by multiple loudspeakers of a sound system in response to an input signal to the sound system. The method comprises determining in real-time the estimated value of the sound pressure level or sound exposure on the basis of the input signal. The sound system is a level-calibrated sound system. Also disclosed is a real-time sound level estimator. Also disclosed are a method and a real-time sound level estimator where the estimated value is based on an approximate value of system properties based on microphone measurements, or established for multiple listening positions, respectively. Also disclosed are methods of calibrating and monitoring a sound system and calibration and monitoring devices therefore.

The invention discloses an eddy current probe ring array method for detecting the laying direction of a carbon fiber composite material. The method includes: constructing an eddy current probe ring array, selecting an eddy current probe optimum frequency, conducting eddy current probe autobias adjustment, extracting signal feature extraction information and calculating signal amplitude, utilizing polar coordinates to display a normalized signal and determining the directional angle of a laying layer. The carbon fiber composite material laying direction detection method provided by the invention combines probe array method and near resonance frequency work mode to extract probe signal induced voltage, presents the laying direction information of a carbon fiber laminated plate in a polar coordinate form, can accurately and effectively realize judgment of the carbon fiber composite material laminated plate laying, has the characteristics of fast imaging speed, clear and reliable imaging result, visualizability and understandability.

The invention discloses an optical method-based anti-motion interference reflection type pulse rate signal detection device and relates to the field of detection instruments. According to the pulse rate signal detection device, two LED light-emitting tubes are arranged for receiving two signals in a photoelectric receiving tube after being matched with the reflection characteristic of a narrow-band total reflection film. Between the above two signals, one signal is an optical signal completely reflected by the narrow-band total reflection film directly after being emitted from the LED light-emitting tubes through an air layer, wherein the pure noise interference is achieved. The other signal enters a human body through the skin of the human body after being emitted from the LED light-emitting tubes through the air layer, the narrow-band total reflection film and a flexible substrate, and is finally reflected back to the photoelectric receiving tube, wherein the signal contains the pulse information with noise interference. After the two signals are obtained, the two signals can be used for subsequent data processing. In this way, the pulse information of a person to be tested is calculated. The device is designed based on a photoelectric volume pulse wave monitoring method, and has the non-invasive characteristics. By means of the device, the pulse information can be quickly and accurately obtained.

The invention discloses a system error checking method and device. The system error checking method comprises the following steps: providing a test environment; when the operation of the target account is detected in the current system operation environment, switching the operation environment corresponding to the target account from the current system operation environment to the test environment; and checking system errors according to the obtained user behavior information and the system abnormal information. The system error checking method and device provided by the invention at least have the following technical effects: the system error checking method provided by the invention guides online users to a test environment, and solves the problem of system error checking cost by using asmall amount of machines and computing resources.

The invention discloses a flaw detecting device for detecting bottom cracks or defects of a steel rail. The flaw detecting device for detecting the bottom cracks or defects of the steel rail comprises a first support column (11), a second support column (12), a third support column (13), a fourth support column (14), a first transmission mechanism (31), a second transmission mechanism (32), a first bottom plate (41) and a second bottom plate (42). Both the first bottom plate (41) and the second bottom plate (42) are in an L shape; the first support column (11) and the second support column (12) are arranged on both sides of the first transmission mechanism (31), and the bottom ends of the first support column (11) and the second support column (12) are fixedly connected with the upper end surface of the first bottom plate (41); the third support column (13) and the fourth support column (14) are arranged on both sides of the second transmission mechanism (32), and the bottom ends of the third support column (13) and the fourth support column (14) are fixedly connected with the upper end surface of the second bottom plate (42); the upper end surface of the first bottom plate (41) is provided with a plurality of pits (411), and the center of every pit (411) is provided with a stand column (412). The flaw detecting device for detecting the bottom cracks or defects of the steel rail can detect internal flaws in the middle of the bottom of the steel rail and achieve high sensitivity.

The invention provides a cell viability detection device and method based on optical fiber digital coaxial holographic microscopy and relates to the technical field of cell detection. The device comprises a laser light source emitting unit, an image collecting unit, an image acquisition unit, an objective table and a computer, wherein the upper-end plane of the objective table is provided with a transparent object-carrying window for placing cell sap, the laser source emitting unit is arranged at the lower end of the object-carrying window, the image acquisition unit is arranged at the upper end of the object-carrying window, and the output end of the image acquisition unit is connected with the input end of the computer. The device has the advantages that a cell sap hologram is determinedaccording to the fact that cells and an environment medium have different light refractive indexes and light passing the cells changes in phase as compared with light passing the environment medium,a Fourier transform method is used to reconstruct and invert cell section images, and arc tangent operation is used to obtain the true phase images of the cells; cell viability is determined accordingto the proportional relation between cell phase differences and refractive index differences; noninvasive and nondestructive quantitative imaging of biological cells is achieved.