1638 results about "Signal amplification" patented technology

The invention discloses an SF6 gas leakage detection method and system based on a photoacoustic spectrum analyzer, and the method comprises the steps: arranging a sampling end to collect an SF6 gas sample, and obtaining stable gas input through constant-current sampling and steady-state pretreatment; steady-state gas is guided into the photoacoustic spectrum analyzer, and resonance frequency stabilization and signal amplification output are achieved through the self-tuning unit; executing double-microphone differential detection and digital filtering processing, and outputting a stable SF6 detection signal with a high signal-to-noise ratio; performing time calibration, abnormity elimination and consistency processing on the detection signal to generate standardized detection data; inputting the standardized data to a Transform model, and performing inversion to generate an SF6 leakage source position and a diffusion path; and displaying an inversion result on a monitoring interface, triggering a sound-light alarm when the inversion result exceeds a limit, and uploading the inversion result to a cloud monitoring platform. According to the invention, the intelligent photoacoustic spectrum system combining photoacoustic-fluid steady-state control and self-tuning detection is constructed, so that high-sensitivity detection and accurate positioning of SF6 gas leakage are realized.

The invention discloses a high-speed level conversion circuit, and belongs to the technical field of integrated circuit design, the circuit mainly comprises an input signal processing module, a voltage boosting module, a differential signal generation module, a signal amplification module and an output module, the input signal processing module converts a low-voltage input signal into a complementary logic signal pair; the voltage boosting module raises the voltage amplitude of the complementary logic signal by using a charge pump principle; the lifted signal drives a thick gate transistor in the differential signal generation module to generate a differential signal; the signal amplification module adopts a cross coupling structure to quickly amplify the differential signal; and finally, the output module outputs a high-voltage domain signal in an inverted manner. By introducing voltage bootstrap before gate driving, the overdrive voltage of a core switch tube is remarkably increased, so that the problem of low conversion speed of a traditional level conversion circuit is effectively solved on the premise of not increasing the device size and static power consumption, and high-speed and high-efficiency level conversion is realized.

Provided herein are methods of determining a location or presence of a target analyte in a biological sample by detecting oligonucleotide-conjugated binding agents.

A logarithmic amplifier system is disclosed. The system includes first and second amplifiers respectively having first and second gains; a first multiplier having an input connected to an output of the first amplifier, and being configured to output a first multiplied signal based on an output signal of the first amplifier and based on a received first multiplication factor equal to a value K; a second multiplier having an input connected to an output of the second amplifier, and being configured to output a second multiplied signal based on an output signal of the second amplifier and based on a received second multiplication factor equal to 1 minus the value K; a transition shaping circuit configured to change the value K from 0 to 1 with a filtered transfer function; and a summing circuit having inputs coupled to outputs of the first multiplier and the second multiplier.

The invention provides an immunodetection method of a multi-index immune checkpoint detection kit, which belongs to the technical field of immunodetection and comprises three main stages of sample preparation, immune reaction and data analysis. The method comprises the following steps: firstly, carrying out centrifugal separation to obtain a plasma sample, and preparing a fluorescent microsphere coupled capture antibody and biotin labeled detection antibody compound; then carrying out immune reaction, forming a sandwich type immune complex through specific binding, and adding streptavidin marked by phycoerythrin for signal amplification. Detecting a fluorescence signal by adopting a flow cytometer to obtain an original data matrix; a contribution feature vector, a utility feature vector and an expression feature matrix are extracted through a feature decomposition algorithm, and a deep learning model of a total-score-total structure is established for data analysis. Finally, a detection report containing a quantitative result, an importance score and reliability evaluation is generated, and the technical problem that in the prior art, the analysis accuracy of a multi-index immune checkpoint detection result is insufficient is solved.

The invention discloses a method for detecting the concentration of cyclosporine in blood through fluorescence and electrochemical double signals, and belongs to the technical field of biochemical analysis and medical detection. Aiming at the technical problems of insufficient sensitivity and high false positive rate of traditional single-signal detection of blood concentration of cyclosporine, the method comprises the following steps: activating carboxyl microspheres by a coupling agent, fixing double-stranded DNA (deoxyribonucleic acid) formed by a cyclosporine aptamer and an initiator chain, inducing the initiator to release by using a cyclosporine sample, realizing strand displacement through an A2-PEI composite system, and detecting the blood concentration of cyclosporine by using an A < 2 >-PEI composite system. DNA modified cadmium telluride quantum dots are respectively adopted to detect fluorescence signals, eATRP electrochemical signal amplification is carried out to detect electrochemical signals, concentration values obtained by the two signals are verified, and an average value is taken as a result. The method can accurately capture low-concentration cyclosporine signals in blood, eliminates interference of a single method, is mainly used for accurately monitoring the blood concentration of cyclosporine, and provides a reliable detection means for medication safety and curative effect control of cyclosporine in clinical scenes such as organ transplantation.

The invention provides a correlated double-sampling program-controlled gain amplifier for a high-energy particle detection pixel sensor and an implementation method, and solves the technical problem that a large dynamic range and high readout precision cannot be considered at the same time during existing high-energy particle detection. The circuit comprises a correlated double-sampling circuit, a signal polarity conversion circuit, an amplification feedback circuit and a configuration automatic judgment circuit. The correlated double sampling circuit is used for performing double sampling on the output voltage of the pixel signal to obtain twice sampling voltage; the configuration automatic judgment circuit is used for selecting configurations for switching according to the voltage difference between the two sampling voltages to obtain an output signal; and the amplification feedback circuit is used for performing fixed gain voltage amplification on the output signal to obtain an amplified voltage signal. The circuit can be widely applied to the technical field of integrated circuits.

The invention relates to the technical field of intelligent security inspection equipment, in particular to a self-learning metal detection security inspection door capable of being intelligently adjusted. The signal acquisition module is used for acquiring magnetic field change information of the total magnetic field; the signal amplification module is used for amplifying the electric signal; the signal filtering module is used for filtering the amplified electric signal; the alarm module is used for analyzing whether a metal early warning standard is met or not based on the amplitude of the filtered electric signal; the recording module is used for recording a time node for sending the alarm signal and a processing log aiming at the alarm signal; the analysis module is used for analyzing whether operation of the security check door is qualified or not based on the number proportion of the passing time nodes and determining the disqualification reason based on the variance of the amplitude of the electric signals of the passing time nodes, the traditional metal detection technology and the intelligent analysis algorithm are combined, the security check efficiency is improved, and the operation and maintenance cost is reduced.

The invention discloses a Cb Ago-based TdT detection reagent and a Cb Ago-based TdT detection method. The TdT detection reagent comprises a TdT extension reaction system and a TdT detection system, wherein the TdT extension reaction system comprises a TdT reaction buffer solution, deoxythymidine triphosphate, cobalt ions and an extension reaction detection probe; the Cb Ago system comprises Cb Ago, a Cb Ago buffer solution and a fluorescence report probe. The extension reaction detection probe disclosed by the invention can extend under the action of TdT, and then is in specific complementary pairing with the fluorescent reporter probe to activate Cb Ago to cut the fluorescent reporter probe, so that TdT detection is realized. The high specificity of the TdT extension reaction and the signal amplification capacity of Cb Ago are combined, and the method has the advantages of being easy and convenient to operate, high in sensitivity, low in cost, suitable for on-site detection and the like and is expected to become a powerful tool for detecting TdT.

The invention belongs to the field of immunological detection, and provides a double-antibody sandwich ELISA kit for detecting the content of human beta-NGF. The enzyme-linked immunosorbent assay kit constructed by the invention is based on a double-antibody sandwich method, and is combined with a biotin-streptavidin signal amplification system and an enzyme developing amplification system, so that the detection sensitivity and specificity are greatly improved, and low-content samples can be accurately and quickly detected. The kit shows excellent stability and specificity and can be used for quantitatively detecting the content of beta-NGF in samples such as human serum, cell supernatant or tissue homogenate, so that an objective detection basis is provided for diagnosis, curative effect evaluation and pathogenesis research of related diseases.

The invention provides a low-noise amplification circuit, a radio frequency front-end module and an electronic terminal.The low-noise amplification circuit comprises an input matching adjustment circuit, a common-source amplification circuit, a first inductor, an inter-stage feedback circuit, a common-gate amplification circuit, an input and output feedback circuit, an output matching adjustment circuit and an output attenuation circuit; the common-source amplification circuit comprises at least two first signal amplification units; each first signal amplification unit comprises a first field effect transistor; the common-gate amplification circuit comprises at least two second signal amplification units; and each second signal amplification unit comprises a second field effect transistor. According to the low-noise amplification circuit, transconductance nonlinearity of devices under different bias signals can be mutually counteracted, so that the linearity fluctuation of the low-noise amplification circuit at different temperatures is optimized, and the linearity of the low-noise amplification circuit is kept basically not to change along with the temperature change.

The invention relates to a beam feedback system based on radio frequency direct acquisition, which comprises a beam position detector, a sum and difference device, a front-end processing module, a feedback processor and an amplification excitation module which are connected in sequence, the sum-difference device is used for determining a horizontal position signal, a vertical position signal and a longitudinal position signal of the beam bunch according to the position signal of the beam bunch, the front-end processing module is used for pre-processing the position signals of the beam bunch, and the feedback processor is used for sampling the pre-processed position signals of the beam bunch; the feedback module is used for receiving a beam bunch and generating a horizontal feedback signal, a vertical feedback signal and a longitudinal feedback signal of the beam bunch, and the amplification excitation module is used for amplifying the feedback signals of the beam bunch and acting the amplified feedback signals of the beam bunch on the beam bunch, so that the instability of the beam is inhibited.

The invention relates to the technical field of power sources, and provides a power source control system, which comprises a signal source interface, a signal conditioning circuit, a power transmitter, a voltage control circuit and a controller, the signal source interface, the signal conditioning circuit and the power transmitter are connected in sequence, the power transmitter is connected with the voltage control circuit, and the voltage control circuit is connected with the controller; the signal source interface is used for receiving an external signal sent by an external signal source; the signal conditioning circuit is used for performing signal amplification and gain adjustment on an external signal to obtain a power amplification signal; the power transmitter is used for converting the power amplification signal into a radio frequency signal and transmitting the radio frequency signal; the controller is used for controlling the voltage control circuit to adjust the output voltage of the radio frequency signal according to a first voltage value corresponding to the radio frequency signal and a second voltage value when the radio frequency signal is transmitted last time. By adjusting the output voltage of the radio frequency signal, the output voltage is matched with the radio frequency signal, and the signal transmission quality and transmission efficiency are improved.

The utility model provides a passive infrared human body detection sensor. The passive infrared human body detection sensor comprises a shell which plays a role in protection and fixation; the Fresnel lens is assembled at the opening end of the shell and is used for converging external infrared radiation and segmenting a sensor detection area; the MEMS galvanometer is assembled at the focus of the Fresnel lens and is fixed on the shell through a bracket structure; the control circuit board is fixed on the mounting supporting column of the shell through screws, a pyroelectric sensing unit, an AD conversion circuit and a microcontroller MCU unit are assembled on the control circuit board, and the pyroelectric sensing unit comprises two pyroelectric sensing units, an induction window covering the pyroelectric sensing units and a signal amplification and filter circuit; a sensing window of the pyroelectric sensing unit faces the MEMS galvanometer, and the normal direction of the pyroelectric sensing unit is perpendicular to the central axis of the Fresnel lens. According to the utility model, static human bodies in a detection area can be effectively detected, environmental noise interference can be effectively overcome, and high detection sensitivity is also provided for human bodies moving in the radial direction and in the horizontal direction.

Systems, devices, and methods are provided for pulsed strain gauge topologies. A weight sensor assembly may comprise one or more load cells for receiving excitation pulses during a first state period of a duty cycle, sample and hold (S / H) circuitry connected to the one or more load cells that holds analog measurement signals from the one or more load cells, first filtering circuitry connected to the S / H circuitry for processing the analog measurement signals and producing a DC level signal, an amplification system connected to the filtering circuitry, for amplifying the DC level signal, second filtering circuitry connected to the amplification system for filtering power line noise, and analog-to-digital (ADC) circuitry connected to the second filtering circuitry. Examples of load cells described herein include full-bride load cells (FBLCs) and half-bridge load cells (HBLCs).

Certain aspects of the present disclosure generally relate to electronic components and, more particularly, to circuitry for signal amplification for transmission. One example apparatus generally includes: a modem; a controller; a feedforward path coupled between the modem and the bias controller; and an amplifier having a main amplification path and an auxiliary amplification path, wherein the controller is configured to provide at least one bias signal for biasing the auxiliary amplification path based on information associated with a transmission signal, the information being provided by the modem to the controller via the feedforward path.

The utility model provides a sampling circuit, an analog circuit and electronic equipment, and the sampling circuit comprises an input processing unit which is connected with the output end of a target circuit, and is used for collecting the common-mode output voltage of the target circuit, and carrying out the sampling input processing of the common-mode output voltage, and obtaining a first operational amplifier in-phase sampling signal and a first operational amplifier anti-phase sampling signal; the signal amplification unit is connected with the input processing unit and is used for respectively amplifying the first operational amplifier in-phase sampling signal and the first operational amplifier anti-phase sampling signal to obtain a second operational amplifier in-phase sampling signal and a second operational amplifier anti-phase sampling signal; and the signal stabilization unit is connected with the signal amplification unit and the control circuit, and is used for keeping the second operational amplifier in-phase sampling signal and the second operational amplifier anti-phase sampling signal, generating a feedback signal according to the second operational amplifier in-phase sampling signal and the second operational amplifier anti-phase sampling signal, and outputting the feedback signal to the control circuit. In this way, the input impedance and the sampling precision are improved.

The invention discloses construction and application of a confinement enhanced photoelectrochemistry-electrochemiluminescence dual-mode biosensor, and relates to the technical field of biosensing and analytical chemistry. The preparation method of the biosensor comprises the following steps: taking a CdS (at) SiO2 (at) NaYF4: Yb / Tm nano composite material as a substrate to obtain a confinement enhanced photoelectrochemistry (PEC) and electrochemiluminescence (ECL) sensing interface; in combination with a DNA wheel nanostructure triggered by target acetamiprid, signal amplification is realized; and synchronous dual-mode quenching detection of PEC and ECL signals is realized by virtue of peroxidase-like catalytic precipitation and wide-spectrum absorption characteristics of the PtPd-CoSnO3 nanocube. The biosensor prepared by the invention has the advantages of high sensitivity, strong reliability, good selectivity and the like, can be applied to accurate detection of acetamiprid in samples such as agricultural products and the like, and has important application value in the aspects of environmental monitoring and food safety control.

The invention relates to the technical field related to bio-electricity signals, in particular to a plant emotion visualization method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring bio-electricity signals of different parts of a plant in different scenes by adopting a signal amplification circuit; extracting feature vectors of the corresponding bio-electricity signals under different scenes; based on the feature vector, a reinforcement learning algorithm is adopted for classification so as to identify the emotion type of the plant electric signal, and the corresponding relation between the bio-electricity signal and the emotion type is constructed; wherein different emotion types correspond to different scenes; acquiring real-time bio-electricity signals of different parts of the plant; and determining the emotion type of the plant based on the real-time bio-electricity signal and the corresponding relationship, and further determining the actual scene of the plant.

The invention discloses a sensing focal plane image recognition system based on FPGA acceleration, and aims to improve the real-time performance, flexibility and adaptability of image recognition, the system comprises a photoelectric detector array, a signal amplification module, a signal filtering module, a signal reading module, a multi-stage bias module and a parallel main control module based on an FPGA, according to the system, through a parallel computing architecture accelerated by the FPGA, the image processing speed can be effectively improved, and the real-time identification requirement is met; the system supports the adaptation of various detectors, is particularly compatible with a non-silicon-based detector, and solves the problem of non-uniformity through a dynamic correction mechanism. The integrated design not only reduces the power consumption, but also improves the overall efficiency and stability of the system.

The application relates to a DNAzyme-based gene chip biosensor and application thereof, and belongs to the technical field of electrochemical sensors. In order to solve the technical problems of low specificity and accuracy, long processing time and high cost in the single nucleotide polymorphism detection method in the prior art, a DNAzyme-based gene chip biosensor is provided, which comprises a DNAzyme molecular probe SNP recognition system and a solid-liquid phase mixed catalytic network system. The application provides a proteinase-free and space-oriented biosensing strategy, utilizes a molecular switch based on a DNAzyme probe to realize accurate SNP recognition, utilizes a space steric hindrance parallel amplification system to enhance signal amplification and simultaneously inhibit background noise, so that the detection performance is remarkably improved; and the gene chip biosensor can be applied to genotyping and trait selection in crop improvement and other applications.

The invention discloses a welding seam change detection device and method for a steel structure in a building, and relates to the technical field of building steel structure welding seam detection.The welding seam change detection device comprises a protective shell, a sensing module, a data processing module and an alarm module are arranged in the protective shell, and a mounting unit is further arranged at the bottom of the protective shell; the method further comprises the steps of S1 pretreatment of a weld joint detection area, S2 device positioning and installation, S3 system initialization and parameter configuration, S4 weld joint deformation signal collection, S5 signal processing and transmission, S6 anomaly analysis and alarm triggering and S7 continuous monitoring. According to the invention, the array-type magnetoelastic sensing unit is combined with the AD conversion chip unit and the signal amplification unit, so that high-resolution acquisition of microvolt-level signals is realized, and tiny deformation in transverse, longitudinal and shearing directions can be captured; meanwhile, through signal amplification in the step S3, the step S4 and the step S5, the early recognition capability of the tiny defects of the welding seam is remarkably improved, the sensitivity reaches 5 mu epsilon, and 0.1 mm-level microcracks can be accurately recognized.

The invention relates to a terahertz high-power power amplifier assembly, which belongs to the field of electronic devices and comprises a synthesis network consisting of a synthesis network upper cavity and a synthesis network lower cavity, and a small signal amplification module, a medium-power amplification module, a driving-stage power amplifier module, a final-stage power amplifier module and a detection module are arranged on the back surface of the synthesis network lower cavity. An E-plane waveguide directional coupler is arranged in the synthesis network, the small signal amplification module, the medium-power amplification module, the driving-stage power amplification module, the final-stage power amplification module and the E-plane waveguide directional coupler are electrically connected in sequence, and a port of the E-plane waveguide directional coupler is electrically connected with the detection module; a waveguide tube is arranged in the installation position of each module in the synthesis network, and the modules are electrically connected through the waveguide tubes. According to the invention, each stage of amplifier is modularly designed, so that the isolation degree among devices of a link can be increased, and the self-excitation risk caused by space radiation is reduced. And the testability of a single module is improved, and the troubleshooting cost and time are reduced.

An alternating-current electromagnetic field stress measurement system, comprising: an excitation signal generation module, an alternating-current electromagnetic field stress measurement stress probe, a signal amplification circuit, an A / D conversion circuit and a processor, wherein the excitation signal generation module is used for loading a sinusoidal alternating-current signal to an excitation coil of the alternating-current electromagnetic field stress measurement stress probe, such that a periodically changing electric field is generated on a measured magnetic object; the alternating-current electromagnetic field stress measurement stress probe is used for sequentially routing a stress characterization signal, which is detected from the measured magnetic object, through the signal amplification circuit and the A / D conversion circuit, and then sending the stress characterization signal to the processor; and the processor is used for processing the received stress characterization signal by using an optimized J-A model in which an implicit equation originally characterizing a change in the magnetization intensity or magnetic induction intensity along with stress is made explicit, so as to calculate the stress of the measured magnetic object. The alternating-current electromagnetic field stress measurement system can monitor the stress increase trend in real time, and notice potential dangers in time. Further comprised is an alternating-current electromagnetic field stress measurement method and a computer program for executing the alternating-current electromagnetic field stress measurement method.

The invention relates to a multi-machine calibration method and system for a Raman spectrometer, and a storage medium, and the method comprises the steps: outputting an adjustable substrate voltage, and setting an initial signal amplification gain; controlling a CCD sensor to collect first Raman spectrum data of a standard sample with a known standard wave number; establishing a mapping model from a pixel domain to a wave number domain based on a plurality of known standard wave numbers and second pixel point positions of the characteristic peaks corresponding to the known standard wave numbers in the first Raman spectrum data to obtain calibration parameters of the Raman spectrometer; verifying the accuracy of the mapping model by verifying the characteristic peak, and storing calibration parameters after the verification is passed; controlling the plurality of Raman spectrometers to respectively detect the same sample to be detected, acquiring second Raman spectrum data of the sample to be detected, extracting a third pixel point position corresponding to a characteristic peak of the sample to be detected, calling the calibration parameter, and converting the calibration parameter into an actually measured wave number; and feeding back and adjusting the signal amplification gain of each instrument based on a signal intensity measurement value corresponding to the second Raman spectrum data by each Raman spectrometer.

The invention relates to the technical field of detection kits, in particular to a blood coagulation reaction linked lupus anticoagulant fluorescence detection kit and application thereof, the kit contains a screening-confirmation integrated reagent, a calibration product, a quality control product and an anticoagulation interference inhibitor; the integrated reagent is divided into a reagent A and a reagent B, the reagent A contains a buffer solution, recombinant snake venom thrombin, composite phospholipid, a fluorescent substrate and other components, and the reagent B contains prothrombin, calcium ions, high-concentration composite phospholipid and other components; the composite phospholipid system is formed according to a specific proportion and modifies beta2-glycoprotein I, the fluorescence enhancement-stabilization system is formed by matching a Schiff base compound with a stabilizer, the calibrator is a series of lupus anticoagulant standard substances, and the quality control substance comprises simulants with different concentrations and negative control. The anti-interference capability is high, and the influence of anti-coagulant drugs and enzyme source fluctuation is reduced; the signal amplification effect is obvious, the detection sensitivity is high and the reagent stability is good; the operation is simple and convenient, screening and confirmation are integrally completed, and a conventional fluorescence detector is adapted.

The invention discloses an electrochemical urine biopsy system for cathepsin B analysis and a detection method of the electrochemical urine biopsy system. The electrochemical urine biopsy system comprises gold nanoparticles AuNPs, a peptide-peptide nucleic acid PNA series probe and an electrochemical sensor. The peptide-peptide nucleic acid tandem probe is combined with gold nanoparticles through a mercaptan modified sequence to form a spherical nanostructure with the diameter of 15 nm, a polypeptide substrate sequence serves as a specific reaction substrate of cathepsin B, and PNA provides stability and a signal shielding function. The electrochemical sensor is based on a cutting enzyme-assisted DNAwalker mechanism, signal amplification is started through methylene blue MB release, and high-sensitivity detection of the released PNA probe is achieved. The system provided by the invention has the characteristics of high specificity, high sensitivity and rapid response, can realize quantitative analysis of cathepsin B through noninvasive urine biopsy, and provides a new technical means for early diagnosis and treatment monitoring of tumors.

A semiconductor driving device according to the present disclosure includes: a timing generation unit which generates gate ON reference signals respectively for a plurality of gate terminals; a gate reference waveform generation unit which generates a first gate reference waveform and a second gate reference waveform on the basis of the gate ON reference signals, and controls the first gate reference waveform and the second gate reference waveform in shifting from a non-conductive state to a conductive state of a multi-gate semiconductor switching element and shifting from a conductive state to a non-conductive state of the multi-gate semiconductor switching element; and a signal amplification unit which receives, as an input waveform, the first gate reference waveform and the second gate reference waveform, and amplifies the input waveform so that an output waveform follows the input waveform.

The invention discloses a noise detection method and device for a dual-mode communication network of a power system. The noise detection method comprises the following steps: acquiring an analog signal transmitted by the dual-mode communication network of the power system in a current detection period and filtering the analog signal; sequentially carrying out signal amplification and analog-to-digital conversion on the filtered analog signal according to a preset sequence of a plurality of preset gain values to obtain a digital signal, carrying out validity verification on the digital signal, and terminating after obtaining a first preset gain value which is verified to be valid; and calculating a noise intensity value of the dual-mode communication network of the power system based on the preset gain value which is verified to be valid for the first time. Through orderly traversal of a preset gain sequence and a first effective immediate stop strategy, orderly matching of effective gains is realized, an ADC signal overflow risk is thoroughly avoided, and complete waveform capture in a strong noise environment is ensured; and meanwhile, traversal times are compressed, and detection time consumption is remarkably reduced compared with a traditional multi-stage gain scheme.

The invention relates to the technical field of psychological health monitoring, and particularly discloses a psychological risk dynamic assessment system and method based on sleep HRV characteristics, the system comprises a signal acquisition module, the signal acquisition module is integrated with a piezoelectric film sensor, a signal amplification circuit, an MCU and a data transmission module, the piezoelectric film sensor is arranged under a mattress, and the signal amplification circuit is connected with the signal acquisition module; the signal acquisition module is used for acquiring a BCG signal; the data processing module is used for processing the BCG signal and converting the BCG signal into an HRV (High Rate Voltage) characteristic value; the risk assessment module is used for generating a dynamic psychological risk assessment result through an HRV-emotion index mapping model on the basis of the HRV feature value; the user interaction module is used for displaying the dynamic psychological risk assessment result through a man-machine interaction device; bCG signals during sleep are collected in a non-contact mode, and HRV features are extracted based on the BCG signals, so that dynamic assessment of psychological risks is achieved.