240 results about "Synchronous detection" patented technology

The invention discloses a synchronous detection system for surface density and wall thickness uniformity of a composite bulletproof helmet, which belongs to the technical field of bulletproof helmet detection and comprises a detector cooperative control module, a two-parameter synchronous acquisition module, a data preprocessing module, a two-parameter cooperative constraint module and an intelligent modeling output module. Through the integrated design that the detection unit integrates the 3D scanning detector, the microwave thickness measuring probe and the beta-ray density detector, and in cooperation with the synchronous triggering and double-channel signal acquisition mode of the double-parameter synchronous acquisition module, synchronous acquisition of the surface density and wall thickness data of the helmet is realized; the problems that traditional step-by-step detection is low in efficiency and poor in data relevance are solved, the detection efficiency and the accuracy of quality judgment are greatly improved, meanwhile, a detection report containing process optimization suggestions is output, the problems that traditional detection results are not visual, and connection with the production process is not smooth are effectively solved, and the product quality is improved. And accurate guidance can be provided for mass production quality control and process adjustment.

The invention discloses a high-precision synchronous detection system and method for mutual influence of current loops of an independent multi-loop electric energy meter. According to the invention, the high-precision current transformer is adopted, a connection framework of primary side series connection, secondary side positive end parallel connection and negative end independence is innovatively designed, and a double-magnetic-ring compensation technology is matched, so that high-precision detection of synchronous same current and synchronous different current of each current loop of the independent multi-loop electric energy meter is realized; the detection cost is remarkably reduced by more than 50%, meanwhile, the precision requirement of 0.05% can be met, and the technical problem that synchronous detection of multiple loops and high-precision verification of the fixed proportion relation of the multiple loops cannot be achieved through a traditional method is effectively solved.

The invention discloses a method for monitoring tail gas emission of an aircraft refueling vehicle, and solves the problem that PM quantitative data acquisition is inaccurate in a complex environment of an airport. The method comprises the following steps: stably sampling and removing aviation kerosene steam through a sampling probe integrating sensing and flow guide adjustment; synchronously detecting and deducting background gas interference; performing secondary dehumidification and constant-temperature pretreatment on the tail gas; the double detection units are linked to collect multi-dimensional data, and a nonlinear interference correction model is constructed through fusion; and adopting an exclusive calibration mode and marking invalid data. The method further comprises the design of wind speed adaptation, condensation backflow prevention, working condition and area label optimization, double-link encryption transmission, safe installation, optical signal compensation, graded maintenance and the like. The method can resist multiple environmental interferences, PM detection errors are controllable, data updating is efficient, and airport safety operation and compliance monitoring requirements are met.

The invention provides a wafer defect double-sided synchronous detection optical module and device, and relates to the technical field of semiconductor material surface defect nondestructive detection. The wafer defect double-sided synchronous detection optical module and the wafer defect double-sided synchronous detection optical module and the wafer defect double-sided synchronous detection optical module have the advantages that detection optical paths can be designed according to characteristics of third-generation compound semiconductor materials and classified statistics of common defects, various optical response mechanisms are integrated, and synchronous detection of the upper surface and the lower surface of a to-be-detected sample is realized.

The invention discloses a temperature and hydrogen concentration dual-parameter synchronous detection system and method, and the system comprises an ASE broadband light source, the output of the ASE broadband light source is divided into two paths through a coupler, one path enters a first circulator, the other path enters a second circulator, the output of the first circulator enters a first FBG sensor, the output of the second circulator enters a second FBG sensor, and the output of the first FBG sensor enters a second FBG sensor. The two FBG sensors are arranged in the gas chamber, the first FBG sensor and the second FBG sensor are provided with FBG topological optical fiber structures with different working wavelengths and have temperature sensitivity and gas selective response, and reflected signals of the two FBG sensors are coupled to one path through the dual-channel wavelength division multiplexer and are sent to the spectrum analyzer for wavelength demodulation. The temperature sensitivity and the gas selective response are integrated in the same sensing unit by utilizing the wavelength coding characteristic of the fiber bragg grating, so that precise decoupling and real-time output of double parameters are realized, and the detection efficiency and the data consistency are improved.

The present application relates to water quality detection and analysis technical field, specifically to a kind of water total phosphorus multi-parameter synchronous detection method based on water, comprising: after the original water sample is pretreated, the standard test solution obtained is simultaneously introduced into parallel digestion tank and optical cell, and the digestion and conversion of phosphorus compound and the collection of water sample background spectrum are completed synchronously.Digestion liquid is distributed to multiple independent color developing channels, each channel uses characteristic color developing agent configured for different concentration interval or interference condition, concurrent color developing reaction is carried out under the same environment, and the reaction kinetics time sequence spectrum of each channel is collected.The background spectrum and all kinetic spectrum sequences are input into integrated calibration model for data fusion and cross analysis, and total phosphorus content detection result is directly output.The method realizes wide concentration range, high anti-interference capability of water total phosphorus rapid and accurate detection by parallel acquisition of homologous background information and multi-reaction channel kinetic data.

A kind of heart sound sensing structure and its preparation method, the structure includes double SOI substrate, center mass, elastic support beam, piezoresistive sensing unit and capacitive sensing unit.The front surface of center mass is provided with additional mass layer, and the back surface is kept bottom layer silicon to increase thickness;Elastic support beam connects mass and frame;Piezoresistive sensing unit is composed of four piezoresistors to form wheatstone bridge, and capacitive sensing unit includes movable and fixed comb-tooth capacitive plate crossing each other.When the sound pressure gradient of heart sound signal drives mass to deviate, elastic support beam bends to change piezoresistive value, and at the same time, comb-tooth capacitive plate overlapping area changes to cause capacitive value change, to realize piezoresistive and capacitive dual-mode synchronous detection.Two kinds of detection mechanisms calibrate each other, which significantly improves the sensitivity and anti-interference ability of low-frequency heart sound signal.The preparation method is based on double SOI substrate, integrated by ion implantation, etching, metal deposition and 3D printing process, suitable for miniaturized wearable heart sound monitoring application.

The invention discloses a crawler excavator driving speed and driving linearity detection system and method, and the system comprises a target plate group, a laser displacement sensor, a microcontroller MCU and a Phyphox mobile phone terminal special test software, the target plate group comprises target plates A, B and C which are sequentially arranged along a preset driving route, the center lines of the three target plates are collinear and are parallel to the initial advancing direction of the excavator; the detection axis of the laser displacement sensor is orthogonal to the advancing direction of the excavator, and the horizontal distance between the excavator and the target plate is collected in real time; the MCU is used for acquisition, preprocessing, operation and data communication of signals of the laser displacement sensor; the Phyphox mobile phone end special test software establishes communication with the microcontroller MCU through Bluetooth to process detection data, synchronous detection of the driving speed and linearity is achieved, and the test efficiency is improved; whether the excavator is in a constant-speed driving state on a test road section or not is accurately judged, and the requirement that the driving speed of the excavator in a test area is constant is met.

The invention discloses a device and a method for synchronously detecting the focal length and the surface topography of a micro-lens array, which can realize synchronous detection on the focal length and the surface topography of the micro-lens array through a set of system, realize mutual matching between two parts of results and greatly shorten the detection time. The device comprises a first monochromatic laser light source (1), a first collimating lens (2), an attenuation sheet (3), a reflector (4), a microlens array sample (5), a microscope objective (6), a barrel lens (7), a first quarter-wave plate (8), an area array detector (9), a first monochromatic optical filter (10), a second monochromatic laser light source (11), a second collimating lens (12), a linear polarizer (13), a beam splitter prism (14), a polarization beam splitter prism (15), a second quarter-wave plate (16) and a reference lens (17). A third quarter-wave plate (18), a second monochromatic optical filter (19) and a polarization camera (20).

This utility model discloses a synchronous extension detection device, relating to the field of seat belt bracket detection technology. It includes a support frame and a support plate mounted on the upper surface of the support frame. A first cylinder is provided on the upper surface of the support plate, with its output end penetrating the support plate and fixedly connected to the upper surface of a lifting plate. A spring is also fixedly provided on the lower surface of the lifting plate, with the other end of the spring connected to a guide plate. A third limiting groove is provided on one side of the guide plate, and a matching guide plate is slidably mounted on the third limiting groove. This utility model uses a second cylinder to drive the guide plate to move up and down within the second limiting groove. The extension pin, under the action of the guide shaft, extends forward synchronously to perform a push detection on the tightness of the seat belt bracket and the two sides of the reinforcing plate. This achieves synchronous detection of the tightness of the connection between the seat belt bracket and the two reinforcing plates, improving detection efficiency and accuracy, and meeting the needs of large-scale production of automotive parts.

The invention relates to a measurement system (10) of the MEMS and / or NEMs type comprising: a resonant assembly (RE) comprising a plurality of N indexed OMRi resonators i, at least one resonant mechanical element MEij coupled to each OMRi resonator, and at least one waveguide (WG) to which the optical resonators are coupled, an emission device (ED), an injection device (ID), each OMRi resonator of the resonant assembly being further configured to be excited at a mechanical excitation frequency (fex / o(i)) and to modulate the light beam associated with said first excitation frequency (fex / o(i)), a resonant mechanical element (MEij) being configured to be excited at a mechanical excitation frequency (fex / e(i,j)) and to modify an optical transmission or reflection in the vicinity of the optical resonance of said associated resonator, said modification being a function of a physical quantity (u) to be measured,at least one detector (Det) and a demodulation device (DDM) comprising a plurality of synchronous detection demodulation modules (11), referred to as LIA. Figure 11,

This utility model discloses a gauge for detecting the straightness and span of a long U-tube, belonging to the technical field of heat exchanger copper tube processing and mold manufacturing. It includes a base, a span detection component and a straightness detection component fixed on the base. The span detection component includes an outer shell fixed on the base, an inner shell that cooperates with the outer shell, and a U-shaped detection block fixed on the inner shell. The straightness detection component includes a lower support and an upper support, and a floating inner sleeve component located between the upper support and the lower support. The integrated span detection component and straightness detection component can simultaneously detect the center distance of the copper tube and the straightness, achieving synchronous detection of the two parameters. Moreover, by replacing the U-shaped detection block and the floating inner sleeve component with different sizes and specifications, it can be applied to the rapid detection of copper tubes of different diameters and the accuracy verification of the mold. That is, by using a replaceable inner diameter component to adapt to copper tubes of different diameters, the detection efficiency and accuracy are improved.

The invention relates to the technical field of intelligent learning of dispensing machines, and discloses an XYZ three-axis intelligent path learning control system, which comprises a module M1 and a multi-mode scanning module, the module M2 is a three-axis cooperative motion module; the module M3 is a dynamic compensation module; a module M4 which is an adaptive path planning module; the module M5 is a dispensing execution module; according to the invention, through a multi-scale data fusion technology of blue light three-dimensional scanning and a laser confocal sensor, the limitation of traditional secondary scanning is broken through, high-precision synchronous detection of curvature sudden change areas and microcracks is realized, a scanning module adopts a hierarchical analysis algorithm, geometric data and micro-topography characteristics are fused, and the detection precision is improved. Key topological information is reserved in complex curved surface reconstruction, the glue path coverage integrity is improved, and the problem of information loss of a traditional coarse scanning and fine scanning mechanism is solved.

The embodiment of the invention provides a log detection method and device, electronic equipment, a vehicle and a medium, and the method comprises the steps: screening out a key parameter from an original log, and adding the key parameter to the original log to obtain an enhanced log; performing log analysis on the original log and the enhanced log to obtain basic template information corresponding to the original log and enhanced template information corresponding to the enhanced log; and performing anomaly detection on the basic template information and the enhanced template information to obtain a log detection result. According to the method, the key parameters are screened out from the original log, so that the key parameters are reserved. The key parameters are added to the original log, the original log is enhanced, the problems of parameter loss and fault missing detection during subsequent processing are avoided, synchronous detection of structural features and parameter values is achieved, the problems that the detection dimension is single, and parameter abnormity cannot be recognized are solved, and the detection efficiency is improved. And the accuracy of the log detection result is improved.

The invention discloses a polarization multiplexing metasurface design method and device for aspheric mirror shape and parameter simultaneous measurement, which can be used for simultaneously completing high-precision measurement of shape and parameters of an aspheric mirror in the same light path, and avoids the defects of multiple optical elements, complex and huge system, high difficulty in installation and adjustment and easiness in external interference in the traditional method. And the modulation area can be fully utilized to ensure the test resolution, and the integrated, lightweight and high-precision synchronous detection of the surface shape and the parameters is realized. The method comprises the following steps: (1) performing optical path modeling to determine a target phase; (2) carrying out target phase-based transformation; (3) establishing a metasurface unit library; (4) constructing a metasurface unit array: traversing a metasurface unit library according to the target phase after the basis transformation, and sequentially selecting unit parameters with the minimum difference between the actual phase and the target phase at each spatial position from the metasurface unit library; and (5) functional detection and optimization.

The invention discloses an intelligent protection switch control method and system for ecological restoration equipment, and the method comprises the steps: building an operation parameter reference containing temperature compensation through collecting current and voltage signals of a power supply loop of the equipment, and achieving the quantitative representation of the multi-working-condition operation characteristics of the equipment; a self-adaptive monitoring strategy is generated by adopting a dynamic threshold division and periodic feature detection technology, and the sampling frequency is adjusted in real time according to the parameter deviation degree; a multi-channel synchronous detection and starting surge compensation mechanism is introduced, and real-time evaluation of a fault risk coefficient is completed through edge calculation; graded protection actions are executed according to the risk levels, reliable locking of the protection state and timely sending of fault information are ensured through electrical and mechanical dual locking and multi-link alarm reporting, and an intelligent and self-adaptive full-process protection control scheme is provided for ecological restoration equipment.

The invention discloses a design method of a three-order active filtering automatic test system, and the method comprises the steps: controlling a PXI platform through LabVIEW programming to achieve the generation of a sweep frequency signal and the collection of filtering response, and completing the signal processing, characteristic analysis and result visualization. The system integrates six core technologies, namely a modularized hardware architecture, automatic process control, frequency domain parameter precision measurement, multi-order characteristic synchronous detection, software and hardware collaborative linkage and simulation data comparison. On the basis of retaining traditional functions such as setting waveform type, amplitude, sweep frequency range, sampling rate, trigger mode, recording cut-off frequency, gain and other parameters, exponential sweep frequency accurate excitation and adaptive signal acquisition are innovatively realized, link interference is reduced through matrix switch multi-channel scheduling, a LabVIEW parallel thread and a feedback node mechanism are combined, and the adaptive signal acquisition is realized. And closed-loop analysis of amplitude-frequency / phase-frequency characteristics and real-time drawing of a Bode diagram are completed.

The application discloses a BLDC rivet automatic feeding detection mechanism, which comprises two transverse vibration supports arranged on a workbench, a longitudinal feeding plate arranged corresponding to a channel, a rivet detection assembly for detecting defective rivets and a defective product dropping mechanism for receiving defective rivets. The transverse vibration supports and the longitudinal feeding plate are arranged to quickly convey the rivets to be detected, so that manual feeding is avoided and the work efficiency is improved. Meanwhile, the rivet detection assembly and the defective product dropping mechanism are arranged to cooperate with each other to detect the rivets. The automatic detection improves the detection accuracy and realizes synchronous detection of a conveying line, thereby reducing the complexity of an assembly line.

The invention relates to the field of defect detection, and discloses an injection molding part defect detection method based on collaborative operation of double mechanical arms, which is characterized in that an upper mechanical arm and a lower mechanical arm cooperate to complete synchronous acquisition of double-sided images, so that a turnover link is omitted; the problems of low detection efficiency, product damage and positioning deviation caused by overturning in the prior art are effectively solved, and the device has the advantages that double-sided synchronous detection of the injection molding part can be realized without overturning operation, the problems of prolonged detection period, secondary product damage and positioning deviation are effectively avoided, and meanwhile, the detection integrity and the production efficiency are improved.

The disclosure includes a memory, a horizontal synchronization detection circuit, a phase comparator, a lock circuit, a PLL, and a frequency divider. The memory that reads out a written video signal in response to a read clock signal and outputs it as an output video signal. The horizontal synchronization detection circuit detects a horizontal synchronization signal from the video signal. The phase comparator generates a phase difference signal indicating a phase difference between the horizontal synchronization signal and a frequency-divided clock signal. The lock circuit receives a free-running clock signal and generates a reference clock signal in which a phase signal is shifted by an amount of the phase difference indicated by the phase difference signal. The PLL generates the read clock signal that is locked to the phase of the reference clock signal. The frequency divider generates the frequency-divided clock signal by dividing the read clock signal.

The application discloses a pump-repump-probe time-resolved spectrum system for measuring luminescence and absorption, comprising a laser beam splitting module, a probe light path construction module, a pump light path regulation module, a repump light path adjustment module, a double-channel signal acquisition module and a light path coupling and converging module. The same femtosecond laser is used to split a light beam, two-stage light splitting is performed to obtain initial light beams of pump, repump and probe light paths, and each light path is subjected to delay adjustment, wavelength conversion, focusing and other treatments, and then is precisely coupled at the same spatial position of a sample. The double-channel signal acquisition module synchronously captures luminescence signals and probe light transmission signals of the sample, and realizes data acquisition in combination with reference light path calibration. The test method acquires multidimensional dynamic information through light path optimization, light beam coupling, signal synchronous acquisition and analysis. The system realizes synchronous detection of luminescence and absorption signals under the same excitation condition, and solves the test error and single mode limitation of the traditional independent system.

The application discloses a kind of fabric multifunctional detection device, it is related to fabric multifunctional detection technical field, including detection table, feed zone and discharge zone are provided with continuous detection mechanism, detection zone is provided with fabric clamping mechanism, and detection table is provided with feeding mechanism, and support frame is provided with the multi-station detection mechanism for the synchronous detection of multiple to-be-detected roll fabric.The advantages are that: by winding roll, the detection area of to-be-detected roll fabric is continuously changed in the winding mode, so that automatic replacement can be realized without long downtime, which facilitates continuous detection in terms of rapid replacement of to-be-detected fabric; by setting two feeding mechanisms to move alternately to the detection zone for feeding, the preparation time required between different performance detections is reduced, which improves the continuity between different performance detections in terms of rapid replacement of abrasive and weight; different abrasives and weights are replaced in batches, and integrated continuous detection operation of wear resistance, pilling resistance and color fastness is carried out.

The utility model relates to optical module test technical field, concretely for a kind of low-speed TTL optical module error code testing device, including error code testing box, auxiliary detection component and to-be-detected piece;The side box of error code testing box is integrated with multiple groups of detection connecting port, each group of the detection connecting port is adapted to connect detection lead, and the other end of the detection lead is connected with plug-in interface;The auxiliary detection component contains auxiliary plug-in box, by the design of auxiliary detection component, multiple groups of to-be-detected piece are placed in the limiting groove of auxiliary plug-in box in turn, the adjusting plate and guide plate are driven to move using telescopic cylinder, make the plug-in interface on guide plate synchronous with the connecting port of multiple groups of to-be-detected piece butt joint, realize the synchronous detection of multiple groups of low-speed TTL optical module, compared with the error code testing device of traditional only single detection, greatly shorten test time, satisfy the demand of multiple optical modules simultaneous testing in large-scale production, effectively improve production progress.

The invention relates to the technical field of nondestructive testing, and discloses a bullet train hollow shaft inner hole integrated nondestructive testing method matched with a step structure. According to the method, a probe assembly integrated with a positioning sensor, an eddy current sensor, a magnetic memory sensor, an ultrasonic sensor and a visual sensor is adopted, and detection is automatically executed based on preset step axial coordinates. The probe firstly moves to the position of a target step, and image recognition and centering verification are carried out through a visual sensor; then a coupling agent supply system is started, and a coupling film layer is formed between the ultrasonic sensor and the hole wall; then controlling the probe to perform forward and reverse rotary scanning, synchronously acquiring ultrasonic, eddy current, magnetic memory and visual data, and binding with the rotation angle; according to the method, fixed-point, stable and synchronous detection is carried out on the known high-risk area, low-efficiency global scanning is replaced, controllability and optimization of the coupling state are achieved, the detection efficiency, reliability and defect detection rate are remarkably improved, and the method is particularly suitable for accurate and efficient comprehensive evaluation of the internal step area of the hollow shaft of the bullet train.

The utility model relates to rustproof steel elevator door pocket detection technical field, and disclose a kind of size detection calibration tool for stainless steel elevator door pocket production, including drum conveyor, the top of drum conveyor is provided with measuring mechanism, one end of measuring mechanism is provided with dismounting mechanism, measuring mechanism includes measuring frame, the inside slide of measuring frame is connected with sliding block, one end of sliding block is fixedly connected with first air cylinder, the other end is fixedly connected with first measuring plate, the inside fixed connection of measuring frame has return spring, one end of return spring is fixedly connected with second measuring plate, the bottom fixed connection of second measuring plate has mounting seat, this size detection calibration tool for stainless steel elevator door pocket production, three size synchronous detection are realized by measuring mechanism, effectively reduce the tedious operation of multiple adjustment measurement position, reduce the measurement error caused by artificial intervention, reach the effect of improving detection efficiency and detection accuracy.

The invention discloses a high-precision double-side thickness synchronous detection system for a notebook computer shell, and relates to the field of appearance detection, and the system comprises a positioning module which is used for receiving a to-be-detected notebook computer shell, adsorbing the surface of the shell through a plurality of groups of adjustable vacuum adsorption parts, and carrying out the automatic centering and posture calibration of the shell based on the feedback of a displacement sensor; the detection module integrates symmetrically-arranged detection units and is used for synchronously applying detection signals to preset detection points on the two sides of the positioned shell and collecting original detection data related to the thickness of the two sides; the adsorption pressure is dynamically adjusted along with the surface curvature, the posture is accurately calibrated in a linkage mode, it is ensured that the detection object is stably positioned, the posture deviation is extremely small, the detection signal counteracts the distance and medium attenuation influence through amplitude real-time compensation, the original data quality is optimized in cooperation with self-adaptive filtering denoising and accurate amplitude calibration, and the detection accuracy is improved. And temperature, humidity and other environmental factors and material characteristic correction are fused, so that the thickness calculation result is closer to reality.

The application discloses a double-head synchronous detection device for charging gun terminal processing, which comprises a machine body. The device is used in cooperation with a clamping mechanism, a first detection mechanism, a second detection mechanism, an auxiliary mechanism, a drying mechanism and an anti-splashing mechanism. The device can detect the connection strength of the terminal first, determine the durability of the terminal according to the number of insertions and extractions, adsorb dry paper on the inner wall of a standard sealing cylinder, spray water on the connection between the charging gun nozzle and the standard sealing cylinder by a water spraying head, and avoid water splashing on the first detection mechanism on the right side during the test due to the anti-splashing frame, so that the detection effect of the first detection mechanism is prevented from being affected. In addition, whether there is water on the paper is observed by a camera, so that the sealing effect is determined. For the standard sealing cylinder with poor sealing performance, the heating element is made to enter the standard sealing cylinder and move back and forth by the drying mechanism, so that the standard sealing cylinder is dried, and the influence on the next test is avoided.

The present application belongs to the technical field of visual detection equipment, and particularly relates to a transparent bottle visual detection method and an all-purpose machine visual detection equipment; the present application separates and positions the bottle body through a marshalling mechanism, performs a humanized bottle overturning action to reduce impact, stirs the liquid at a low speed, irradiates and collects images through a three-way light source, tracks the bottle body through a synchronous detection module, and combines a classification and rejection mechanism to solve the problem of low detection accuracy caused by bubble interference and disordered liquid movement in the prior art, effectively reduce liquid oscillation and bubble generation in the bottle through the humanized bottle overturning action and low-speed rotation, avoid detection interference, significantly improve the accuracy and stability of special-shaped bottle detection, and reduce the misjudgment rate.

The invention discloses a radar beacon device with power measurement feedback adjustment and a power measurement feedback adjustment method. The radar beacon device comprises a data processing unit used for receiving parameters and control instructions, processing uploaded measurement power information and controlling an attenuation value; the signal processing unit is used for outputting a synchronous trigger signal to the power measuring unit; the microwave frequency conversion unit is used for realizing receiving, modulation and frequency synthesis of radio frequency signals; the power measurement unit is used for collecting observation signals, performing synchronous detection by combining with the synchronous trigger signals, and outputting measurement data to the data processing unit; and the display control unit is used for setting equipment working parameters and displaying the current state and power information of the equipment. According to the invention, the power measuring device is additionally arranged to monitor a transmitting signal, and a monitoring result is fed back to the control unit to control the transmitting link attenuator to set a corresponding attenuation value, so that the actual output power is consistent with the set power value, the problem of outputting absolute power is solved, and the requirement of high power precision is met.

The application discloses a kind of based on bimodal resonance's photoacoustic-scattering aerosol dual-wavelength synchronous detection system and method, belong to photoelectric detection technical field, in the system, dual-wavelength light source modulation module generates two different frequency modulated laser, respectively from two ends into double-difference bulb pipe coupling photoacoustic-scattering combined gas cell;The gas cell includes the two ends of two acoustical tubes arranged in parallel and each is connected with an integrating sphere, form H type coupling structure;Scattering signal collection module, photoacoustic signal acquisition and processing module respectively acquire two-channel scattering photon counting data in two integrating spheres, sound wave signal in two acoustical tubes and two integrating spheres;Digital lock-in signal processing module based on FPGA outputs modulation signal to light source, and receives sound wave signal in two acoustical tubes and two integrating spheres to carry out full-digital demodulation and processing.The application effectively solves the problem of time-space asynchronization and sampling cumulative error caused by time-sharing multiplexing or multiple machine parallel connection.