180 results about "Acoustic attenuation" patented technology

The invention discloses an integrated measurement method and system for hydrological elements in a high-salinity and high-sand environment, and relates to the technical field of hydrological monitoring, and the method comprises the steps: correcting the theoretical signal receiving strength of each sonar through an established sound attenuation model, and then calculating an effective signal-to-noise ratio, thereby achieving the measurement of the underwater topography in the high-salinity and high-sand environment. According to the method, a dynamic weight fusion algorithm is adopted to perform data fusion on the water depth data of each sonar to obtain fused water depth data, and an inversion method based on residual error minimization is adopted to perform iterative optimization on model parameters, so that the accuracy is relatively high. When the water velocity and the flow rate are measured in the high-salt and high-sand environment, iterative decoupling is carried out based on the sediment particle motion comprehensive model to obtain the sediment particle velocity, then the water velocity is updated based on the measured apparent velocity and the difference value, and after the updated water velocity is converged, the flow rate is calculated. And the accurate water flow rate can be calculated by combining the flow cross section area. The measurement precision of the unmanned ship on the hydrological elements in the saline-alkali area can be improved.

The application relates to a method for measuring coating interface stiffness by using ultrasonic echo phase first derivative spectrum, belonging to the technical field of ultrasonic nondestructive testing. The method detects a coating sample by vertical incidence of ultrasonic waves, collects aliasing echoes of a coupling medium / coating and a coating / substrate interface P R , carries out fast Fourier transform to obtain an unwound phase P R , carries out fast Fourier transform to obtain an unwound phase R , carries out fast Fourier transform to obtain an unwound phase R , carries out fast Fourier transform to obtain an unwound phase f , carries out fast Fourier transform to obtain an unwound phase K , carries out fast Fourier transform to obtain an unwound phase n , carries out fast Fourier transform to obtain an unwound phase The method reduces the influence of material sound attenuation, interface roughness and other factors on the detection result, has high quantitative precision, wide application range, large detection depth range, easy operation and other advantages, and is free from the dependence on a high-quality reference signal in traditional construction of URCAS or URCPS.

The invention belongs to the technical field of noise source impedance extraction, and discloses a noise source impedance extraction optimization method and system considering the sensitivity of an insertion loss method, and the method comprises the steps: extracting an equivalent circuit of noise source impedance based on the insertion loss method, and calculating a noise attenuation coefficient through the equivalent circuit, a noise source impedance amplitude and phase information are sought according to the noise attenuation coefficient; calculating relative sensitivity by using the noise source impedance amplitude and phase information, and analyzing an influence rule of a noise attenuation coefficient on noise source impedance extraction precision based on the relative sensitivity; and generating a setting rule of a noise attenuation coefficient according to the influence rule, extracting a frequency band meeting the noise source impedance requirement by using the setting rule, and determining the inductance to perform noise source impedance extraction optimization operation. According to the method, firstly, analytical expressions of noise source impedance amplitude and phase are deduced, the influence rule of the noise source impedance property on noise source impedance extraction precision is analyzed, and the requirement required to be met by noise source impedance extraction precision is improved.

The invention relates to the field of high-end ultrasonic transducer manufacturing, and particularly discloses a patch type ultrasonic transducer for deep tissue imaging and an acoustic material preparation method, and a backing preparation method comprises the following steps: weighing an adhesive, a metal filler and a non-metal additive according to a mass ratio of 15: 55-75: 2; fully and uniformly mixing the weighed raw materials, and putting the mixed sample into a molding mold capable of demolding; the pressure is maintained for 10-30 min under the conditions that the pressure is larger than 10 MPa and the plasticizing temperature of the adhesive is reached, then the heating function is turned off, when the temperature is reduced to 120 DEG C, the pressure is rapidly reduced to 0 MPa at the moment, the adhesive is taken out when the adhesive is naturally cooled to the room temperature, and the backing is obtained. The problems of high sound attenuation, low sound impedance and low sound velocity preparation of the backing are solved, the dilemma problem of low sound impedance and ultrahigh sound attenuation is effectively solved, and the problem that the ultrathin design of the wearable patch type ultrasonic transducer conflicts with the maintenance of excellent acoustic performance due to insufficient sound attenuation of the existing backing is effectively solved.

The invention relates to a fruit maturity nondestructive intelligent detection method and system based on high-frequency dynamic excitation and acoustic vibration signal analysis. The method comprises the following steps: controlling an excitation device to apply high-frequency transient mechanical excitation to a fruit; synchronously collecting a vibration response signal on the surface of the fruit and an internal sound wave signal; extracting dynamic feature vectors including formant characteristics, sound wave attenuation coefficients and time domain attenuation constants from the sound vibration signals; inputting the feature vector into a time sequence convolutional network model to obtain a final maturity grade and a judgment confidence coefficient; and starting an active learning mechanism for a low-confidence sample, and continuously optimizing the model through manual annotation and incremental learning. By detecting the internal physical characteristics of the fruits, the defects that the traditional visual and tactile methods are interfered by surface states and the internal maturity is difficult to judge are overcome, and rapid, lossless and high-precision intelligent detection of the maturity of the fruits with self-evolution capability is realized.

The invention relates to the technical field of defect detection, in particular to an array ultrasonic detection device and method for internal defects of a heterogeneous laminated plate, and provides a high-precision and high-efficiency detection device and method for the internal defects of the heterogeneous laminated plate. A defect area is heated through focused ultrasound, echo signals are enhanced, and the defect recognition rate is increased; according to the method, the mechanical arm and the three-dimensional walking mechanism are combined, automatic large-range scanning and local accurate detection are achieved, the problem of defect missing detection caused by sound attenuation of the heterogeneous laminated plate can be effectively avoided, and the defect detection accuracy is improved.

The utility model belongs to the technical field of reactors, and particularly relates to an extra-high voltage shunt reactor oil tank composite noise reduction structure which comprises a rubber plate fixedly installed in an oil tank wall, the outer side of the rubber plate is attached to the surface of the inner side wall of the oil tank wall, and a sound absorption hole-free paperboard is fixedly installed on the inner side of the rubber plate. A double-layer composite perforated plate sound absorption mechanism is fixedly installed on the inner side of the sound absorption hole-free paperboard, gaps are reserved among the rubber plate, the sound absorption hole-free paperboard and the double-layer composite perforated plate sound absorption mechanism, and a gap is reserved between two layers of perforated plates of the double-layer composite perforated plate sound absorption mechanism. The double-layer composite perforated plate sound absorption mechanism comprises a first perforated paperboard and a second perforated paperboard. The composite noise attenuation structure composed of the rubber plate and the multiple layers of insulating paper plates is arranged on the inner side wall of the oil tank, vibration waves transmitted from insulating oil are blocked and weakened through material combination of different media, vibration noise can be reduced, and the composite noise attenuation oil tank is an important measure for solving the problem of noise of an electric reactor.

The invention provides indoor air quality monitoring equipment and a sensor cooperative control system, relates to the technical field of indoor environment monitoring, and is used for solving the problems of response delay, temperature drift accumulation and alarm accessibility reduction in long-term operation of an air monitoring device. The device realizes feed-forward identification and closed-loop suppression of sample injection degradation, filter material pollution and dislocation, heat drift in the machine and acoustic attenuation: a sampling confirmation window is adaptively adjusted to reduce misjudgment, channel-level temperature drift compensation and power consumption derating are cooperatively executed according to priorities to realize steady-state temperature control, and a prompt link keeps subjective loudness consistent based on equivalent gain; meanwhile, the baseline is refreshed after maintenance to maintain long-term consistency; therefore, under the condition that the mechanical appearance is not changed, the monitoring accuracy, stability and alarm accessibility are remarkably improved, and the device-level design value of structural perception driving is highlighted.

The invention discloses a multi-sleep behavior activity identification method and system in the technical field of acoustic sensing, and aims to solve the optimization problem of the existing multi-sleep behavior activity identification technology. The method comprises the following steps: preprocessing a collected dual-track acoustic signal in an ear canal of a user to obtain a processed dual-track acoustic signal; according to the processed dual-track acoustic signal, sleep behavior event detection and segmentation are carried out based on an adaptive detection and segmentation algorithm of a dynamic threshold, and a sleep event set is obtained; according to the sleep event set, sleep behavior events are classified based on accumulated spectrum power, and a sleep body activity event set and a sleep acoustic activity event set are obtained; according to the sleep body activity event set, based on acoustic attenuation and accumulated spectrum power, performing fine-grained identification of body activity events; and performing multi-dimensional feature extraction according to the sleep acoustic activity event set, and performing fine-grained identification of the acoustic activity events by using the extracted multi-dimensional features.

The utility model discloses a noise reduction structure and a range hood, and belongs to the technical field of kitchen appliances. The noise reduction structure comprises a perforated plate, a sound absorption cavity and a sound absorption layer, the side, close to the air channel, of the perforated plate serves as a sound wave incident face, the sound absorption layer is connected with the perforated plate, the perforated plate is used for reducing incident high-frequency sound wave energy, the sound absorption cavity is used for reducing incident low-frequency sound wave energy, and the sound absorption layer is used for reducing incident medium-high-frequency sound wave energy. Compared with the prior art, the composite noise reduction structure in the sandwich form is additionally provided with the sound absorption cavity, low-frequency noise reduction can be achieved, the low and medium frequency noise reduction effect of the noise reduction structure is improved, and therefore the use experience feeling of a user is effectively improved. The range hood disclosed by the utility model comprises a main case and the noise reduction structures, and the noise reduction structures are arranged on the two sides of the main case. According to the range hood, low-frequency noise attenuation is achieved, and the use experience feeling of a user is effectively improved.

The invention discloses an intelligent design system and method for an aviation airborne porous system complex flow channel shell part, and relates to the technical field of intelligent design, and the system comprises a data obtaining module which is used for obtaining a three-dimensional flow channel shell model, a working condition parameter set and a manufacturing limit; the feature extraction and arrangement band generation module is used for generating a candidate arrangement band; the hole group design and optimization module is used for generating a circumferential shallow cavity communication scheme and hole group arrangement; the acoustic impedance synthesis module is used for constructing equivalent surface complex impedance; the performance index calculation and association module is used for constructing system insertion loss and system additional voltage drop indexes; the multi-target tradeoff and solution verification module is used for obtaining a definite solution; and the design and manufacturing output module is used for taking the determined solution as parameterized computer aided design data and formulating manufacturing key points. According to the method, the arrangement area can be accurately selected in the complex flow channel, the controlled hole group can be constructed, and both noise attenuation and flow loss are considered.

The invention relates to the technical field of electric drive NVH of new energy vehicles, and discloses a method and system for formulating an electric drive NVH order noise target value. The system comprises a vehicle performance positioning analysis module, a competing vehicle noise analysis module, an acoustic simulation analysis module, a rack sound attenuation calculation module, an electric drive NVH noise target value making module and a verification and optimization module. The method comprises the following steps: determining positioning of a vehicle type carrying an electric drive; nVH related data of competitive vehicle models are collected; setting an in-vehicle NVH noise target value; analyzing sound attenuation characteristics of the whole vehicle; calculating the sound attenuation of the rack; an NVH order noise target value of the electric drive rack is formulated; and verifying and optimizing. The scientific and systematic method for formulating the electric drive NVH order noise target value is provided, the factors such as market positioning, competitive product analysis and whole vehicle sound attenuation of the whole vehicle can be comprehensively considered, the reasonable noise target value is formulated for electric drive, and the driving comfort and market competitiveness of a new energy vehicle are improved.

The audio device comprises a first receiver (501) that receives audio data of a source comprising a scene of an acoustic environment divided by acoustic attenuation boundaries. A second receiver (501) receives metadata including a set of reverberation parameters indicative of reverberation levels generated by audio sources in the acoustic environments and an energy transfer parameter indicative of energy attenuation between the acoustic environments. For a listening acoustic environment, a selector (513) selects a first set of reverberation parameters in response to a parameter value of the first set of reverberation parameters and an energy transfer parameter indicative of an attenuation of the acoustic environment and the listening acoustic environment from the first set of reverberation parameters. A reverberator of the plurality of reverberators (509, 511) generates a reverberated audio signal based on the first set of reverberation parameters, and a renderer (507) renders an audio signal for listening to the acoustic environment, the audio signal comprising components derived from the reverberated audio signal.

Disclosed is a method for estimating ultrasound attenuation coefficient by use of aberration compensation and the reference phantom method. Measurements on a human sample at a single transmit frequency and on multiple reference phantoms at a plurality of transmit frequencies are performed respectively. The center frequencies of the echo signals at the depth of the top edge of the region of interest are calculated. A specific reference phantom at a specific transmit frequency is selected by the echo signals whose center frequencies are closest to the center frequencies of the echo signals from the human sample at the aforementioned depth to compensate for the aberration. Then the spectra of the echo signals from the selected reference phantom at the selected transmit frequency and the spectra from the echo signals from the human sample are used to estimate the attenuation coefficient of the human sample by following the reference phantom method.

The invention discloses a submarine sediment in-situ low-frequency acoustic measurement system and method. The in-situ low-frequency acoustic measurement system for the seabed sediment comprises a mother ship, a control center, an umbilical cable, a low-frequency sound source transmitting host, a drill rod and a self-contained acoustic receiver, when the low-frequency sound source emission host controls the drill rod to drill into a target detection stratum, the self-contained acoustic receiver is put into the drill rod, after the drill rod clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection stratum, and the drill rod is used for drilling seabed sediments; the low-frequency sound source transmitting host is used for transmitting sound wave signals with different frequencies, and the self-contained acoustic receiver processes and converts the received sound wave signals with different frequencies into data and stores the data; the control center reads data measured by the self-contained acoustic receiver and analyzes the data to obtain sound velocity and sound attenuation of the seabed sediment at different frequencies. According to the invention, the accuracy of ocean sediment acoustic measurement can be improved, and the frequency range of ocean sediment acoustic measurement is increased.

This disclosure provides a wedge and design method for a multipath acoustic attenuation phased array ultrasonic testing probe. The wedge includes a wedge body, multiple silencing grooves, and a damping block. The extension direction, spacing, and depth of each silencing groove are configured such that at least a portion of the reflected transverse wave generated at the detection surface can be guided to an attenuation interface formed by the groove wall of the silencing groove and the damping block. Furthermore, the reflected longitudinal wave generated at the detection surface undergoes at least six interface reflections within the wedge body before returning to the probe direction. The acoustic characteristics of the damping block are configured to absorb the reflected transverse wave. The reflected transverse wave is attenuated at the attenuation interface through a combination of scattering by the silencing groove and absorption by the damping block. After at least six interface reflections, the acoustic component of the reflected longitudinal wave returning to the probe direction forms a 180° phase difference with the incident longitudinal wave emitted by the probe, thus being attenuated through phase interference.

The invention relates to a method for influence of dislocation dipole defects in an aluminum matrix on acoustic parameters, belongs to the technical field of discrete solution, and provides a novel molecular dynamics simulation method for researching ultrasonic sound velocity, sound attenuation and acoustic nonlinear parameter change on the basis of two dislocation dipole structures. The method specifically comprises the following steps: controlling the type and the number of dislocation dipoles in an aluminum matrix, carrying out atomic scale acoustic simulation on dislocation dipole models of different types and numbers by adopting a phase inversion technology, extracting sound velocity by adopting a cross correlation method, extracting sound attenuation by adopting a Hilbert transformation method and extracting acoustic nonlinear parameters by adopting an FFT method aiming at four-phase signals; and precise extraction of acoustic parameters is realized. And determining the contribution of the dislocation defect to the acoustic parameters based on the relationship fitting of the three acoustic parameters and the dislocation defect, thereby realizing the prediction from the acoustic parameters to defect characteristics.

The invention discloses an ultrasonic sound attenuation display method and ultrasonic equipment, and the method comprises the steps: displaying an interface used for selecting a sound attenuation scanning mode, scanning a target tissue based on a first sound attenuation scanning mode in response to a first selection instruction, and obtaining a multi-frame sound attenuation result of a first target region of the target tissue; displaying a multi-frame sound attenuation statistical index of the first target area according to the multi-frame sound attenuation result of the first target area; under the condition that the multi-frame sound attenuation statistical index of the first target area does not meet a first index condition, first abnormity prompting is carried out; in response to the second selection instruction, scanning the target tissue based on a second sound attenuation scanning mode to obtain a single-frame sound attenuation result of a second target area of the target tissue; displaying a single-frame sound attenuation statistical index of the second target area according to the single-frame sound attenuation result of the second target area; and under the condition that the single-frame sound attenuation statistical index of the second target area does not meet a second index condition, carrying out second abnormity prompting.

The invention provides an ultrasonic plane wave multi-mode cooperative imaging method and system, and the method comprises the steps: controlling an ultrasonic probe to execute shear wave elastic imaging and sound attenuation imaging of which the mechanical index is equal to or greater than a first threshold value based on a multi-level voltage control scheme; and executing super-resolution imaging with the mechanical index smaller than or equal to a second threshold value after the super-resolution imaging is completed. The method comprises the following steps: acquiring a sound attenuation coefficient graph generated in a sound attenuation imaging process, and respectively acquiring a first super-resolution graph without contrast agent perfusion, a second super-resolution graph with contrast agent perfusion and a tissue elasticity graph generated in a shear wave elasticity imaging process based on an ultrafast plane wave technology; performing post-processing on the collected first super-resolution graph to generate a probability density graph of the tissue structure, and performing post-processing on the collected second super-resolution graph to generate a microbubble tracking speed graph; and carrying out cooperative imaging on the tissue elasticity map, the sound attenuation coefficient map, the probability density map and the velocity map. The imaging comprehensiveness and accuracy are improved, and early lesion diagnosis is facilitated.

The invention relates to a method for manufacturing a honeycomb core for an acoustic attenuation panel, the honeycomb core comprising a plurality of cells, and obstacles within the cells, comprising: a step of forming a stack (50) comprising a plurality of strips (51, 52), at least one interlayer film (53) being intercalated between two adjacent strips, the interlayer film (53) being attached to each of the adjacent strips (51, 52) along the junction zones, and attached to itself within the portions (533a) of folds (533) located along the junction zones, the interlayer film (53) comprising, at the level of each zone of the stack (50) intended to form an end of a cell, a sacrificial fold; a step of applying pressure, during which pressure is exerted on the stack (50) in a vertical direction (VE);a forming step, during which the stack (50) is stretched along the vertical direction (VE); a step of removing sacrificial folds. Figure 4.;

The application aims to provide a contrast test block preparation method and contrast test block for ultrasonic detection, which comprises the following steps: obtaining the configuration of a woven preform, dividing the configuration of the woven preform into at least two detection partitions, determining the number, size and position distribution of artificial defects in each detection partition, preparing the artificial defects by using a large sound attenuation material, implanting the artificial defects into the corresponding detection partition of the woven preform, and detecting the woven preform with the pre-prepared artificial defects after glue injection and solidification molding. The test block prepared by the method can realize the detection of three-dimensional woven composite members.

An ultrasonic diagnostic imaging system and method produce attenuation coefficient maps of a region of interest in an ultrasound image. In order to detect the presence of elevation aperture blockage, the system estimates attenuation coefficients by two different methods. The estimates produced by the two different methods are combined to produce a metric, which is evaluated as a function of depth. If the metric satisfies one or more criteria of measurement bias, elevation aperture blockage is identified and an alert of the blockage is produced for the user.

Propulsion assembly for an aircraft, comprising a turbomachine (1), an attachment strut (40) and a structural element (10) carrying the turbomachine (1) by the attachment strut (40), the turbomachine having at least one rotating part (30) rotating about an axis of rotation (A), the rotating part (30) being arranged upstream of the structural element (10) and of the attachment strut (40) so that the air jet exiting from the rotating part (30) impacts the structural element (10) and the attachment strut (40) in the wake thereof, the leading edge of the structural element (10) and / or of the attachment strut (40) locally comprising at least one acoustic attenuation device (50, 60, 70, 80) arranged at least partially in the wake of the rotating part (30), the acoustic attenuation device being a partial modification of the structure and / or of the profile of the leading edge (11).

Acoustic attenuation assembly for a motor vehicle brake pedal assembly and a vehicle comprising such an assembly. The invention relates to an acoustic attenuation assembly for a vehicle brake pedal assembly (7), comprising: - an apron (9) behind which a passenger compartment is arranged and in front of which an engine compartment is arranged, - a brake pedal assembly (7), comprising a bracket (21) adapted to support a brake pedal actuated from said passenger compartment, fixed to said apron (9) and extending into said passenger compartment, - a brake amplifier (15), comprising an actuating rod (19) for a hydraulic control of a braking system passing through a cutout (23) made in said apron (9) and extending into a cavity (25) of said bracket.According to the invention, the assembly includes an acoustic attenuation device (27) radially connecting said clevis (21) and said actuating rod (19), comprising an acoustic attenuation material suitable for attenuating sound waves passing through it. Figure 3.

The invention relates to the technical field of medical image processing, in particular to a kidney ultrasonic image-based fibrosis quantitative evaluation method and system, and the method comprises the steps: obtaining an ultrasonic image, carrying out the standardization processing, and estimating a system response correction function and an optical flow field; selecting a key frame based on an optical flow field, performing registration and constructing pose map optimization, fusing a envelope to establish mapping between a cortical conformal coordinate system and a key frame pixel, and generating a cortical region probability field and a boundary uncertainty field; calculating a sound attenuation coefficient and a scattering statistical parameter in the sliding analysis window, correcting the sound attenuation coefficient and the scattering statistical parameter, projecting the sound attenuation coefficient and the scattering statistical parameter to a conformal coordinate system, carrying out Wasserstein gravity center fusion according to probability and uncertainty weighting, detecting the effective thickness of the cortex, and carrying out consensus optimization to obtain a fibrosis fraction field and a consensus residual field; and generating a non-consistency total score, outputting a confidence interval and a confidence level through conformal prediction calibration, and generating a fallback recalculation or re-collection instruction if necessary. The cross-view, cross-time and cross-equipment consistency is improved, and the closed-loop quality control capability is achieved.

An engine of an aircraft comprising an engine core that produces thrust to propel the aircraft. A fan duct extends along a length of the engine core and is positioned between an engine core nacelle and a fan nacelle with the fan duct. A thrust reverser is positioned along the fan duct and has blocker doors and drag links. The thrust reverser is positionable between an open position and a closed position. The open position locates the blocker doors for the air to move along the fan duct and exit at the nozzle exit. The closed position locates the blocker doors across the fan duct to direct the air out of the fan duct through an opening in the fan nacelle. An acoustic attenuation system is mounted in the fan duct and positioned between the thrust reverser and the nozzle exit with the acoustic attenuation system configured to reduce noise caused by fan blade-pass frequency moving through the fan duct.

The application is a method for the influence of dislocation dipole defects in aluminum matrix on acoustic parameters, belonging to the technical field of discrete solution, and provides a new molecular dynamics simulation method for researching the changes of ultrasonic velocity, acoustic attenuation and acoustic nonlinear parameters based on two dislocation dipole structures, specifically, the types and quantities of dislocation dipoles in the aluminum matrix are controlled, the atomic scale acoustic simulation is carried out on the dislocation dipole models of different types and quantities by using the phase inversion technology, the cross correlation method is used to extract the sound velocity, the Hilbert transform method is used to extract the sound attenuation, and the FFT method is used to extract the acoustic nonlinear parameters for the four-phase signals, so as to realize the precise extraction of acoustic parameters. Based on the fitting relationship between the three acoustic parameters and the dislocation defects, the contribution of the dislocation defects to the acoustic parameters is determined, and the prediction from the acoustic parameters to the defect characteristics is realized.

The application provides an ultrasonic attenuation compensation method and device and electronic equipment, for each point of interest in an ultrasonic image, a sound channel is determined according to a plurality of ultrasonic transmitting elements arranged on an ultrasonic probe; for each sound channel, target data of each pixel point on the sound channel is obtained from the ultrasonic image; and according to the target data, an ultrasonic attenuation value for the point of interest is calculated to compensate ultrasonic energy emitted to the point of interest. According to the method, the sound channel is determined according to each point of interest in the ultrasonic image in combination with the ultrasonic transmitting elements, and then the ultrasonic attenuation value for the point of interest is determined according to the target data such as the gray value and TGC value of each pixel point on the sound channel. Since the target data of different pixel points can reflect the heterogeneity of the acoustic impedance of different individuals, the accuracy of the obtained ultrasonic attenuation value can be improved, and the accuracy of the compensation of the ultrasonic energy is improved.

The invention provides a method and a device for detecting cracks of a graphite crucible, and relates to the technical field of nondestructive testing. The method comprises the following steps: transmitting ultrasonic waves to a graphite crucible in a non-contact manner and receiving returned ultrasonic signals by adopting a gas coupling ultrasonic transmitting and receiving assembly; processing the signal using a trained deep learning model to identify cracks within the crucible and determine geometric parameters thereof; and finally, generating and outputting a detection report. Pollution to the porous graphite material is avoided in a gas coupling mode, meanwhile, the technical problems that signals are weak due to high sound attenuation of the material and detection is difficult to achieve through a traditional method are solved by means of the feature learning capacity of the deep learning model, and the micro cracks can be recognized from background noise. Pollution-free and automatic detection of the graphite crucible is realized, and the detection precision and efficiency are improved.

This invention provides an indoor air quality monitoring device and sensor collaborative control system, relating to the field of indoor environmental monitoring technology. It addresses the problems of response lag, temperature drift accumulation, and decreased alarm reachability that occur during long-term operation of air monitoring devices. By treating structural influences as a first-type input and unifying their parameterization, the device achieves feedforward identification and closed-loop suppression of sample degradation, filter material contamination and misalignment, internal thermal drift, and acoustic attenuation. The sampling confirmation window is adaptively adjusted to reduce false alarms; channel-level temperature drift compensation and power derating are prioritized and executed collaboratively for steady-state temperature control; the alert link maintains subjective loudness consistency based on equivalent gain; and the baseline is refreshed after maintenance to maintain long-term consistency. Thus, without altering the mechanical form, the device significantly improves monitoring accuracy, stability, and alarm reachability, highlighting the value of structure-aware driven device-level design.