6 results about "Relative attenuation" patented technology

The invention relates to the technical field of pre-diagnosis and health management, in particular to a low-voltage switch cabinet insulation safety diagnosis method based on discharge characteristic analysis, and the method comprises the steps: synchronously collecting original optical signals through a multispectral sensor array; performing energy compensation by using a multipath reflection equivalent attenuation model to generate reconstructed spectral line intensity data; determining a virtual time zero point by using an autocorrelation function and generating virtual phase analysis atlas data; and constructing an energy spectrum gravity center space coordinate in the energy spectrum feature space to extract a gravity center red shift feature quantity. According to the method, through multi-band relative attenuation rate compensation, power frequency period statistical peak value extraction and energy spectrum space gravity center mapping, the diagnosis problem that the insulation state is difficult to quantitatively evaluate due to signal distortion, reference phase loss and fuzzy characteristic evolution in a non-line-of-sight environment is solved.

The invention provides a linear beam span sensitivity homogenization calibration method and device based on an optical attenuation model, and relates to the field of linear beam detector calibration. The method comprises the following steps: constructing an optical attenuation model based on historical data, and obtaining a calibration range corresponding table between an installation distance and an optimal calibration range; acquiring a maximum infrared signal intensity value which has the maximum system gain and is within a preset signal margin; querying an optimal calibration range corresponding to the maximum infrared signal intensity value Vmax through a calibration range corresponding table, and calculating a distance judgment reference value based on the optimal calibration range; the automatic judging device is operated to obtain the installation distance, and the optimal calibration range is determined and recorded as the target calibration range; synchronously adjusting the current gain of the transmitting end and the signal gain of the receiving end; and carrying out consistency verification on the infrared signal intensity value, and if the verification is passed, automatically setting an alarm threshold value by adopting a relative attenuation model. The technical problems of different alarm sensitivity and poor calibration consistency under different installation distances are solved.

The invention discloses a goodness vector calculation method for measuring modal filtering performance of a vertical linear array. The goodness vector calculation method comprises the following steps: (1) initializing marine environment parameters, line spectrum signal parameters emitted by a sound source and vertical receiving array parameters; (2) calculating each order normal wave mode function excited by a line spectrum signal emitted by a sound source and a receiving sound pressure value at each hydrophone depth of a vertical array by using a Kraken model, and establishing an array receiving sound pressure vector; (3) constructing a sampling mode function matrix, multiplying a pseudo-inverse matrix of the sampling mode function matrix by the sampling mode function matrix to obtain a mode filtering matrix, and calculating a relative attenuation coefficient of each order mode; (4) calculating to obtain a contribution degree matrix by using the modal filtering matrix and the relative attenuation coefficient of each order of modal, and taking out main diagonal element values of the contribution degree matrix to form a goodness vector; according to the method, the modal filtering performance can be quantitatively represented, and a quantitative analysis means is provided for measuring the modal filtering performance under the vertical linear array.

The invention particularly relates to a method and a system for detecting a phase splitting point of a two-phase absorbent for capturing CO2, and belongs to the technical field of carbon dioxide capturing. The method comprises the following steps: controlling the temperature of an absorbent in a phase splitter, and irradiating with laser with a specific wavelength; a linear array CMOS sensor is used for receiving forward scattered light in the range of 0.1-0.29 degrees and converting the forward scattered light into an electric signal, and a light intensity sequence I (t) is obtained; cO2 is introduced for absorption-standing circulation; by calculating the light intensity relative attenuation rate R (t) and monitoring whether the light intensity relative attenuation rate R (t) is continuously lower than the threshold value Rth for reaching the time Thold or not, the phase splitting point is automatically judged, and the CO2 load is recorded. The system comprises a corresponding optical detection module, a signal processing module and a control analysis module, objective, real-time and high-precision detection of phase splitting points is achieved, and the problems that a traditional naked eye method is large in subjective error, and an existing instrument method is insufficient in sensitivity or difficult to be online are solved.

The application discloses a method for determining seismic quality factor with adaptive window length, which comprises the following steps: obtaining post-stack seismic data volume and interval velocity field of a target geologic body, and dividing the geologic body according to the interval velocity field; taking out a first seismic trace from the post-stack seismic data volume, processing the seismic trace by using short-time Fourier transform, calculating centroid frequency at each time sample, and performing smoothing filtering to obtain average centroid frequency of each layer; obtaining window length adjustment coefficient to adaptively determine the time window of each layer; performing time-frequency analysis on the seismic data by using generalized linear frequency modulation wavelet transform to obtain time-frequency spectrum of the seismic trace; calculating instantaneous energy spectrum of the seismic trace; extracting maximum peak energy at each time, and calculating seismic quality factor in the time domain of the seismic trace according to the relative attenuation amount of the maximum peak energy within a wavelength; sequentially extracting other seismic traces in the post-stack data volume, repeating the above steps, arranging the quality factors calculated for the seismic traces in sequence, and obtaining the seismic quality factor of the whole geologic body.

The invention discloses an anti-aging performance evaluation method and system for a transformer winding wire and a storage medium, and relates to the technical field of power transformers. The evaluation method comprises the following steps: acquiring transformer winding wire samples with different aging durations; measuring a plurality of performance indexes of the samples with different aging durations; fitting the performance index measurement data, and calculating the relative attenuation rate and the performance retention rate of each performance index; setting the contribution weight of each performance index to the performance of the transformer winding wire, and calculating the comprehensive relative attenuation rate and the comprehensive performance retention rate of the sample; and evaluating the aging resistance of the sample according to the comprehensive relative attenuation rate and the comprehensive performance retention rate. The standard evaluation method with high comparability is provided for research and development, product shaping and engineering application of the novel conductor material of the transformer winding, and a scientific evaluation system is constructed for reliability verification, service life estimation, operation and maintenance and the like of the novel conductor material in the application of the power transformer winding.