30 results about "Ultrasonic attenuation" patented technology

The invention relates to the technical field of cavitation monitoring, in particular to a tidal current energy water turbine cavitation predicting and monitoring method which comprises the steps that S1, multi-sensor data of a tidal current energy water turbine are collected, and the multi-sensor data comprise vibration signals, ultrasonic signals and pressure signals; s2, performing frequency domain analysis on the vibration signal, and extracting an energy value of a high frequency band as a vibration characteristic value; s3, performing transmission attenuation analysis on the ultrasonic signal, and calculating an ultrasonic attenuation rate as an ultrasonic characteristic value; s4, performing frequency domain analysis on the pressure signal, and extracting a pressure pulsation amplitude at a blade passing frequency as a pressure characteristic value; s5, based on the vibration characteristic value, the ultrasonic characteristic value and the pressure characteristic value, the current cavitation state is determined through a cavitation state judgment rule; and S6, predicting the evolution trend of the cavitation state, and estimating the residual safe operation time of the water turbine under the current working condition. The cavitation recognition result is converted into a quantitative life index, and the method has engineering application value and safety guarantee capability.

The invention provides an ultrasonic particle size detection system for coal slurry. The ultrasonic particle size detection system comprises a fixed frame; a coal slurry container; a stirring device; a degassing device; a particle size detection device; a signal generator and an oscilloscope. The invention provides a coal slurry ultrasonic particle size detection method. The coal slurry ultrasonic particle size detection method comprises the following steps: carrying out ultrasonic particle size detection on clear water to obtain a clear water attenuation amplitude; performing ultrasonic particle size detection on the coal slurry subjected to degassing treatment to obtain a coal slurry attenuation amplitude; calculating a coal slurry ultrasonic attenuation coefficient according to the clear water attenuation amplitude and the coal slurry attenuation amplitude; and performing inversion on the coal slurry ultrasonic attenuation coefficient by utilizing Monte Carlo simulation prediction and a particle swarm optimization method to obtain the coal slurry ultrasonic particle size distribution. According to the invention, coal slurry degassing and granularity detection are systematically realized, and the problems of difficulty in online detection of coal slurry granularity and bubble interference are fundamentally solved.

An ultrasound probe according to an embodiment includes a transducer part, a contact part, and an acoustic transmission layer. The transducer part has plural transducers that transmit and receive ultrasound. The contact part comes into contact with a subject. The acoustic transmission layer is arranged between the transducer part and the contact part and is formed of a material low in ultrasonic attenuation rate. Furthermore, the acoustic transmission layer has a thickness in a range of 2.3 mm to 4.7 mm and is formed using a material having an acoustic impedance of 1.4 MRayl or more and 1.6 MRayl or less.

The present disclosure provides systems and methods for ultrasound enhanced delivery of drugs. Specifically, a drug applicator (202) is provided for a system for ultrasound enhanced delivery of at least one drug to a target site in an intraocular space (100), the system comprising a signal generating unit (300) operably connected to an ultrasound transducer (202), wherein the drug applicator comprises at least one space (800) holding a drug, prepared from a low ultrasound attenuation material, configured to provide low ultrasound loss coupling of the system with the sclera, and configured to be mechanically coupled to the system and further configured to be coupled with low ultrasound loss to the ultrasound transducer. The signal generating unit and / or the ultrasound transducer are / is configured to emit ultrasound waveforms in at least one application cycle comprising at least one ultrasound emission event having a duration TA and a waiting period having a duration TW.

The invention relates to an opto-acoustic-ultrasonic multi-mode bone metabolism and senescence noninvasive detection method and device, and the method comprises the following steps: respectively collecting an ultrasonic signal and a multi-wavelength opto-acoustic signal in a detection period; calculating the ultrasonic sound velocity and the broadband ultrasonic attenuation coefficient of the to-be-detected bone based on the ultrasonic signal, comparing the ultrasonic sound velocity and the broadband ultrasonic attenuation coefficient with the data of the healthy bone, and preliminarily judging the health degree of bone metabolism; based on the ultrasonic sound velocity and the broadband ultrasonic attenuation coefficient of the to-be-detected bone, performing ultrasonic attenuation compensation on a bone tissue part in the photoacoustic signal; fitting the opto-acoustic signal subjected to ultrasonic attenuation compensation corresponding to each wavelength into a transmission equation of a macroscopic homogeneous medium, calculating to obtain a relative light absorption coefficient of each wavelength, and mapping the relative light absorption coefficient and the corresponding wavelength to obtain a relative light absorption spectrum of the to-be-detected skeleton; and performing linear fitting on the relative light absorption spectrum and the main component spectrum in the skeleton, decoupling related photoacoustic parameters of the chemical component content, and further judging the skeleton metabolism and aging degree. Compared with the prior art, the method has the advantages of being low in detection complexity, non-invasive, non-radiative, capable of comprehensively obtaining physical microstructures and biochemical information related to bone metabolism and aging and the like.

The invention discloses a double-layer structure hydrogel coupling gasket for stereo ultrasonic imaging and preparation and application thereof.The double-layer structure hydrogel coupling gasket comprises bottom layer hydrogel and upper layer hydrogel which are complementary in function, carboxymethyl cellulose and polyvinyl alcohol serve as core raw materials of the bottom layer, polyethylene glycol, glycerin and deionized water are matched, and the bottom layer can be tightly attached to the skin and fill body surface gullies; the upper layer takes high-content polyvinyl alcohol and carrageenan as core raw materials, and polyethylene glycol, glycerol and deionized water are used as auxiliary materials. The two-layer structure is integrally formed through an electron beam irradiation crosslinking process, a chemical crosslinking agent is not needed, the biocompatibility of the product is excellent, the ultrasonic attenuation coefficient is lower than 0.1 dB / cmMHz, and the high-fidelity requirement of a three-dimensional ultrasonic image on sound energy conduction can be accurately met. The problems that an existing composite material is insufficient in fitting performance, distorted in signal and blocked in operation in three-dimensional ultrasonic imaging are solved, the preparation process is controllable, and the composite material is suitable for industrial production and can be widely applied to various high-precision three-dimensional ultrasonic inspection scenes.

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 relates to the technical field of conveying detection, in particular to an evaluation method and device for ultrasonic attenuation detection configuration of a coal conveying belt, and the method comprises the steps: obtaining the operation speed of a target coal conveying belt of a to-be-detected engineering site during in-service operation; inputting the running speed into a pre-constructed belt ultrasonic attenuation data model to output a target ultrasonic attenuation value of the target coal conveying belt; based on the target ultrasonic attenuation value, the ultrasonic attenuation detection configuration of the target coal conveying belt is evaluated, so that at least one of the detection wheel distance, the detection wheel number and the ultrasonic detection channel number of the ultrasonic attenuation detection configuration of the target coal conveying belt is determined. Therefore, the problems that the optimal detection scheme cannot be determined in advance according to the actual state of the belt in the prior art, and convenience, high efficiency, economical efficiency and the like of safety detection of the coal conveying belt are reduced are solved.

The invention discloses a power transmission line broken strand monitoring method and device, and relates to the technical field of power transmission line broken strand monitoring. Monitoring data of a power transmission line are obtained through preset anti-vibration broken strand monitoring equipment, broken strand feature extraction is carried out on the monitoring data, and the corresponding amplitude attenuation rate, the corresponding signal-to-noise ratio and the corresponding vibration total energy are obtained; performing frequency spectrum distortion evaluation on the total vibration energy according to a preset reference vibration energy threshold value to obtain a corresponding frequency spectrum distortion coefficient, performing threshold value setting on the reference vibration energy threshold value and a preset reference ultrasonic attenuation threshold value based on a signal-to-noise ratio to obtain a corresponding vibration energy threshold value and a corresponding ultrasonic attenuation threshold value, according to the vibration energy threshold value, the frequency spectrum distortion coefficient, the ultrasonic attenuation threshold value, the amplitude attenuation rate and the vibration total energy, strand breakage detection is carried out, and a corresponding detection result is obtained. The problems that traditional power transmission line broken strand monitoring mostly depends on manual inspection, the efficiency is low, the cost is high, early warning and accurate diagnosis of hidden danger of broken strands are difficult to achieve, and the running reliability of a power transmission line is reduced are solved.

The invention relates to the field of automatic detection of tea processing, and provides a tea withering detection method and system based on ultrasonic attenuation, and the method comprises the steps: synchronously collecting echo signals, position parameters and environment temperature, generating a stacking thickness field matrix through thermodynamic sound velocity compensation and cubic spline interpolation, and outputting porosity correction according to a rheological power law function; a transmission acoustic signal is collected by a time division multiplexing mechanism, a transmission amplitude field and a propagation time field are constructed through Hilbert transform and cross-correlation time delay estimation, average sound velocity distribution is constructed, and a physiological attenuation coefficient and a damage index are generated in combination with porosity correction; a composite feature vector is constructed, and the local water content and the cell wall breakage rate are solved through a space-time gradient coupling network; and generating a global regulation and control instruction in combination with the spatial weighted average moisture content and the accumulation thickness field matrix, and generating a fixed-point targeted raking instruction in combination with the abnormal displacement coordinates. According to the method, acoustic inversion and multi-dimensional closed-loop correction are fused, and digital perception and intelligent targeted regulation and control of the tea leaf withering process are constructed.

The application discloses a kind of based on ultrasonic wave attenuation characteristics pillar load quantitative inversion and safety diagnosis method, belong to rock engineering safety monitoring and nondestructive testing technical field.First, construct the rock sample with different fracture characteristics, carry out loading test under different load and obtain multi-band time domain signal, obtain the attenuation value under different load grade to construct the quantitative relationship model of different frequency band;Statistical pillar fracture characteristic parameters, obtain its attenuation value under each frequency band;Substitute into quantitative relationship model, carry out multi-band data fusion inversion, obtain the current equivalent load of pillar;Calculate safety factor, combined with the stability quantitative evaluation standard constructed, carry out quantitative diagnosis to target pillar stability.The application uses ultrasonic wave attenuation characteristics, improves diagnosis sensitivity and accuracy;Discard single frequency pulse, adopt sweep excitation technology can simultaneously identify the coupling mechanism of load action and fracture characteristics;Overcome the limitation of single factor, realize quantitative judgment.

A method for compensating for ultrasonic attenuation by the head and hair in a wearable ultrasound device, for controlled transcranial ultrasonic therapies that deliver into the brain deterministic ultrasound pressure and intensity, is provided. The method includes positioning a wearable ultrasonic device within degassed water, the device comprising a first ultrasonic transducer and a second ultrasonic transducer; obtaining a first signal amplitude from the device by emitting a first ultrasonic pulse from the first transducer and receiving the first pulse via the second transducer; positioning the device onto the head of a subject; obtaining a second signal amplitude from the device by emitting a second ultrasonic pulse from the first transducer and receiving the second pulse via the second transducer; and scaling an amplitude of the driving voltage of ultrasonic pulses delivered via the device based on a comparison of the first signal amplitude and the second signal amplitude.

The present invention relates to a resin composition for attenuating the sound of ultrasonic waves, the composition having excellent heat resistance and ultrasonic attenuation properties.

A drug applicator for a system for ultrasound-enhanced delivery of at least one drug to a target site in a intraocular space, the system comprising a signal generating unit operationally connected to an ultrasound transducer, wherein the drug applicator comprises at least one space hold the drug, is made from a low ultrasound attenuation material, is configured to provide low ultrasound loss coupling of the system to the sclera, and is configured to be mechanically coupled to the system and further configured to be coupled to the ultrasound transducer with low ultrasound loss. The signal generating unit and / or the ultrasound transducer are configured to emit an ultrasound wave form in at least one application cycle, the application cycle comprising at least one ultrasound emitting event with a time duration TA and a waiting period with a time duration TW.

The invention relates to the technical field of industrial process monitoring and intelligent control, and discloses an emulsified oil stability real-time monitoring and early warning method and system.The method comprises the steps that complex dielectric constant time sequence data and sound wave attenuation data are collected through a multi-band dielectric spectrum sensor array and an ultrasonic attenuation spectrum sensor respectively; in combination with temperature-pressure coupling sensing information, an interface double-electric-layer relaxation time and micro-droplet particle size distribution function is extracted; and inputting the features into a pre-trained neural network model, outputting a stability state index, and triggering a graded early warning and control instruction according to a threshold value. The system is composed of a multi-modal sensing unit, a feature extraction unit, a stability discrimination unit and an early warning decision unit. Through multi-physical field fusion perception and mechanism driven modeling, non-intrusive and high-sensitivity online monitoring of the microcosmic phase change of the emulsified oil is realized, and the early warning accuracy and industrial applicability are remarkably improved.

The application discloses a kind of based on ultrasonic wave attenuation characteristics pillar load quantitative inversion and safety diagnosis method, belong to rock engineering safety monitoring and nondestructive testing technical field.First, construct the rock sample with different fracture characteristics, carry out loading test under different load and obtain multi-band time domain signal, obtain the attenuation value under different load grade to construct the quantitative relationship model of different frequency band;Statistical pillar fracture characteristic parameters, obtain its attenuation value under each frequency band;Substitute into quantitative relationship model, carry out multi-band data fusion inversion, obtain the current equivalent load of pillar;Calculate safety factor, combined with the stability quantitative evaluation standard constructed, carry out quantitative diagnosis to target pillar stability.The application uses ultrasonic wave attenuation characteristics, improves diagnosis sensitivity and accuracy;Discard single frequency pulse, adopt sweep excitation technology can simultaneously identify the coupling mechanism of load action and fracture characteristics;Overcome the limitation of single factor, realize quantitative judgment.

An ultrasound catheter includes: an elongated sheath; an ultrasonic vibrator disposed inside the sheath; and a drive shaft holding the ultrasonic vibrator inside the sheath and rotating the ultrasonic vibrator about a central axis of the sheath, the ultrasonic vibrator includes: an ultrasonic oscillation surface substantially parallel to the central axis of the sheath or inclined at an angle of 15 degrees or smaller with respect to the central axis of the sheath; a back surface that faces in a direction opposite to a direction in which the ultrasonic oscillation surface faces; and a side surface substantially orthogonal to the direction in which the ultrasonic oscillation surface faces, and, in the ultrasonic vibrator, an ultrasonic attenuation member covers the back surface and at least parts of the lateral-direction side surface portions that the side surface portion includes.

A transducer attenuator assembly comprising: an enclosure defining an acoustic chamber coupled to a sound output port of a transducer that is operable to generate audible frequencies from ultrasonic frequencies; and a plurality of openings formed through the enclosure to acoustically couple the acoustic chamber to a surrounding ambient environment, and the plurality of openings are arranged to attenuate an ultrasonic sound wave and leak an audible sound wave output by the transducer to the acoustic chamber.

The invention provides a high-temperature dynamic working condition metal grain size laser ultrasonic detection method and system, and relates to the field of data processing. By constructing a programmable high-temperature environment and introducing controllable reciprocating motion, in-situ laser ultrasonic detection of multiple samples under a high-temperature dynamic working condition is realized; the two-dimensional mobile platform is used for ensuring stable alignment of the excitation light spot and the detection light spot in the movement process, and ultrasonic signals, temperature working condition information and speed working condition information are synchronously collected; time domain and frequency domain attenuation features are extracted based on a multi-working-condition standard sample, a high-dimensional feature vector is constructed, and an artificial intelligence model between ultrasonic attenuation and the grain size is trained; in actual detection, a grain size prediction result and a confidence interval are output, the grain size grade is converted, and batch in-situ lossless quantitative detection of the grain size under the high-temperature dynamic condition is achieved. By means of the technical scheme, non-contact, in-situ, continuous and quantitative batch grain size nondestructive testing can be conveniently achieved under the high-temperature dynamic working condition.

The invention discloses acousto-optic chalcogenide glass with high optical uniformity, the molar composition of the acousto-optic chalcogenide glass is represented by a chemical formula as follows: (1-x-y) Ge.xGa. YTe, x is equal to 0.01-0.2, y is equal to 0.5-0.8, and the acousto-optic chalcogenide glass has a continuous microscopic network structure formed by a GeTe4 tetrahedron and a GaTe3 triangular pyramid. The acousto-optic chalcogenide glass has a high refractive index, a high acousto-optic merit figure M2 and a low ultrasonic attenuation coefficient alpha, and can be used for acousto-optic devices such as an acousto-optic modulator and an acousto-optic frequency shifter. The acousto-optic chalcogenide glass does not contain toxic elements and is an environment-friendly acousto-optic glass material. The acousto-optic chalcogenide glass adopts a sol-gel preparation process, so that the operation is simple, the amplified production is easy, the prepared acousto-optic chalcogenide glass has excellent optical uniformity, impurity particles or stripe defects in the acousto-optic chalcogenide glass are effectively avoided, and the performance stability and reliability of the acousto-optic chalcogenide glass are remarkably improved.

This invention discloses a Ge-Sn-Se-S acousto-optic chalcogenide glass, the chemical formula of which is Ge 20 Sn x Se 80‑x‑y S y In this system, x and y represent the mole fractions of Sn and S, respectively, with x = 5–12.5 and y = 0–25. The basic network unit of the glass frame is a stable tetrahedral structure centered on Ge or Sn. This acousto-optic chalcogenide glass has a wide range of compositional control and is easy to glassen. It is a non-toxic and environmentally friendly green quaternary chalcogenide glass system with high linearity and refractive index, exhibiting strong acousto-optic properties. The acousto-optic quality factor M² at a wavelength of 1550 nm is 211.8 × 10⁻⁶. ‑18 s 3 / g~348.9×10 ‑18 s 3 / g, with an ultrasonic attenuation α of 0.72dB / cm to 4.89dB / cm at a 10MHz ultrasonic frequency, and a laser damage threshold of 2.94J / cm. 2 ~15.54J / cm 2 It has the potential to be applied in high-power laser-modulated acousto-optic devices and can be widely used as an acousto-optic medium in the acousto-optic field.

The invention discloses a method, a system, equipment and a medium for detecting the concentration of oil mist in air by combining ultrasonic attenuation with optical refractive index, and relates to the field of detection of the concentration of oil mist in air, comprising the following steps: synchronously exciting an acoustic signal and an optical signal in a detection cavity; the method comprises the following steps: acquiring a sound wave signal to obtain corresponding sound wave attenuation information, and detecting an interference light path to obtain corresponding interference fringe offset information; respectively calculating corresponding acoustic characteristic parameters and optical characteristic parameters based on the sound wave attenuation information and the interference fringe offset information; obtaining a concentration parameter based on the acoustic characteristic parameter, the optical characteristic parameter, the environment temperature parameter and the environment humidity parameter; a residual error is calculated and judged, and when the residual error exceeds a preset threshold value, the intelligent compensation model is called to correct the concentration parameter. According to the invention, when the residual error is abnormal, the intelligent compensation model is introduced to correct the result, and the problem that a single sensing mode is easily influenced by particle size distribution and environmental change is avoided.

The application discloses a metal 3D printing detection method and device based on emission spectrum and ultrasonic fusion. The method synchronously excites and collects full-waveband spectrum and ultrasonic signals on the surface of a sample by laser. After the signals are preprocessed, they are input into a multimodal deep learning model integrated with a LANet network for feature extraction and fusion. The fused features are used for multidimensional detection. The plasma spectrum is corrected for analyzing element composition and chemical defects. A double-flow time sequence network is constructed to analyze the time domain features of the ultrasonic signals in parallel to evaluate physical defects and analyze the frequency domain sound velocity information to evaluate residual stress. The attenuation features of the ultrasonic signals are modeled by using the deep learning model, the ultrasonic attenuation coefficient is calculated, and the probability distribution of the grain size is obtained. By fusing the two signals and using the powerful feature mining and nonlinear mapping capability of deep learning, the accuracy of detection is improved, and multidimensional comprehensive evaluation of metal 3D printing components is realized.

This invention relates to a method for root cause analysis of defects in the lamination quality of multilayer boards. Its core components include: acquiring multimodal signals of high-frequency pressure, micro-strain, infrared heat flux, and ultrasonic attenuation; combining these signals with equipment process instructions for stage tag association and time calibration; generating process state fingerprint vectors characterizing changes in the physical state of lamination through feature extraction algorithms; matching these vectors with historical samples based on similarity; statistically correcting time offsets between channels; and constructing a high-fidelity causal modeling dataset for synchronized physical events; subsequently, using causal testing and physical mechanism rules, generating dynamic process causal relationships and injecting prior knowledge graphs to achieve reverse defect tracing and main cause chain locking. This technology improves the accuracy of data temporal alignment, the accuracy of lamination process state characterization, and the interpretability of defect diagnosis, which is beneficial for intelligent optimization and quality improvement of the lamination process.

The invention discloses a slurry sand content detection system based on ultrasonic attenuation and optical image bimodal fusion, which is characterized by comprising a middle connecting pipe, a detection pipeline, an ultrasonic detection unit, an optical image acquisition unit, a diffuse reflection light source, an illumination sensor, a steady flow pump, a data processing module and a fusion early warning module. The method solves the problems of detection lag, insufficient precision, incapability of real-time monitoring and the like in the existing method for detecting the sand content of the slurry.

A kind of copper tube grain size detection method based on ultrasonic attenuation, establish detection model, model detection and data acquisition, ultrasonic probe excites the original wave of frequency f m , and the time series signal of original wave is collected;Determine detection scheme: determine the parameter in model, obtain experimental data, extract experimental data, calculate amplitude attenuation coefficient, establish the functional relationship between grain size and amplitude attenuation coefficient, solve the function of grain size and amplitude attenuation coefficient by fitting;Obtain the functional relationship z=f (α) between grain size z and amplitude attenuation coefficient α, the advantages of the present application are: accurately deduced the functional relationship between the sound pressure attenuation coefficient of ultrasonic detection copper tube and the grain size of copper tube. The difference multi-learning step method is used to solve the functional relationship between the sound pressure attenuation coefficient and the grain size of copper tube, which greatly improves the solving efficiency. Real-time control strategy of learning step is adopted, which avoids the divergence of solving process caused by random selection of learning step.

The invention relates to ultrasonic attenuation for a transducer. A transducer attenuator assembly includes a housing defining an acoustic cavity coupled to a sound output port of a transducer operable to generate an audible frequency from an ultrasonic frequency; and a plurality of openings formed through the housing to acoustically couple the acoustic cavity to an ambient environment, and arranged to attenuate ultrasonic waves and leak audible acoustic waves output by the transducer to the acoustic cavity.

The present invention relates to the field of characterizing the acoustic and elastic properties of human tissue. More specifically, it is desired to obtain precise evaluation of attenuation coefficient in ultrasonic frequency range. Known methods implies the use of a complicated set-up. That's why the inventors worked on a method providing with the same accuracy with a simpler set-up. Thus, the present invention relates to a method for determining ultrasonic attenuation of a medium based on a unique ultrasound plane wave applied on the medium. This may notably be used to characterize the steatosis state of the liver, or its coagulation state during thermal treatment such as high-intensity focused ultrasound.

A drug applicator for a system for ultrasound-enhanced delivery of at least one drug to a target site in a intraocular space, the system comprising a signal generating unit operationally connected to an ultrasound transducer, wherein the drug applicator comprises at least one space hold the drug, is made from a low ultrasound attenuation material, is configured to provide low ultrasound loss coupling of the system to the sclera, and is configured to be mechanically coupled to the system and further configured to be coupled to the ultrasound transducer with low ultrasound loss. The signal generating unit and / or the ultrasound transducer are configured to emit an ultrasound wave form in at least one application cycle, the application cycle comprising at least one ultrasound emitting event with a time duration TA and a waiting period with a time duration TW.

The present application relates to the technical field of insulating oil detection, and particularly relates to a kind of on-load tap changer insulating oil multi-parameter detection and evaluation method, comprising: the breathing cycle of open on-load tap changer is divided into fixed breathing phase;Multi-frequency ultrasonic echo full-wave signal and basic calibration parameter are synchronously collected at each collection node under the same breathing phase;The signals of the same breathing phase before and after voltage regulation are differentially processed, a multi-frequency differential feature set is extracted, and a tidal exchange efficiency factor is determined based on the correlation between the multi-frequency ultrasonic attenuation coefficient fluctuation and the ambient humidity;Based on the frequency band sensitivity difference, a plurality of degradation characteristics are obtained, a core state offset factor is quantitatively mapped to obtain a core state parameter, and the core state parameter is determined;Finally, the hierarchical threshold is adjusted according to the tidal exchange efficiency factor, the degradation degree classification and the dominant degradation factor tracing are completed, and the multi-parameter comprehensive evaluation under the open environment is realized, the quantitative perception and accurate early warning of the risk of tidal invasion are realized.