35 results about "Peak finding" patented technology

A three-dimensional imaging radar operating at high frequency e.g., 670 GHz, is disclosed. The active target illumination inherent in radar solves the problem of low signal power and narrow-band detection by using submillimeter heterodyne mixer receivers. A submillimeter imaging radar may use low phase-noise synthesizers and a fast chirper to generate a frequency-modulated continuous-wave (FMCW) waveform. Three-dimensional images are generated through range information derived for each pixel scanned over a target. A peak finding algorithm may be used in processing for each pixel to differentiate material layers of the target. Improved focusing is achieved through a compensation signal sampled from a point source calibration target and applied to received signals from active targets prior to FFT-based range compression to extract and display high-resolution target images. Such an imaging radar has particular application in detecting concealed weapons or contraband.

The invention discloses a composite wavelength reference-based fiber bragg grating sensing demodulation device and method. The composite wavelength reference-based fiber bragg grating sensing demodulation device includes a broadband light source (1), a tunable FP filter (2), an optical fiber primary beam splitter (3), an optical fiber circulator (4), an optical fiber grating sensing array (5), a first optical fiber secondary beam splitter (61), a second optical fiber secondary beam splitter (62), an optical fiber air chamber (7), an optical fiber FP etalon (8), a notching filter (9), a photoelectric detection array (10), a data acquisition card (11) and a processing unit (12); and the composite wavelength reference-based fiber bragg grating sensing demodulation device further comprises a sensing link and a wavelength reference link. Compared with the prior art, and according to the composite wavelength reference-based fiber bragg grating sensing demodulation device and method of the invention, equal-interval reference wavelengths can be provided by the optical fiber FP etalon, and therefore, advantages of high fineness of transmission peaks, easiness in peak finding and wide wavelength coverage range can be realized; absolute reference wavelengths provided by the optical fiber air chamber are not affected by environmental factors such as temperature, vibration and impact; and stable fiber bragg grating demodulation is realized.

A correlation function peak finding method for an image correlation displacement sensing system is provided. The method may include capturing a reference image and a displaced image, and searching for an initial peak correlation function value point (CFVP) with pixel-level resolution based on correlating the reference image and displaced images at a plurality of offset positions. Then a complete set of CFVPs may be determined at each offset position in an analysis region surrounding the initial peak CFVP. Then a preliminary correlation function peak location is estimated with sub-pixel resolution, based on CFVPs included in the analysis region. Finally, curve-fitting operations are performed to estimate a final correlation function peak location with sub-pixel accuracy, wherein the curve-fitting operations apply a windowing function and/or a set of weighting factors that is/are located with sub-pixel resolution based on the preliminary sub-pixel correlation function peak location.

The invention discloses a radar-based non-contact human body breathing detection method and a radar-based non-contact human body breathing detection device. An intelligent algorithm is used to discriminate the motion posture of a vital sign target in a detection area, and when a human body target is determined in a quiet state, the respiratory detection is started, and a respiratory value is output. In the event of respiratory abnormality, an alarm message is sent to notify the family member or the nursing staff in time, so that the people can be promptly treated, the reliability of the respiratory detection is remarkably improved, and the technical problem that the current non-contact detection breathing method cannot determine and detect the target state of the human body can be solved;by performing a wavelet analysis algorithm, time-domain peak finding and downsampling processing on the sampled echo signals, a respiratory signal can be accurately identified and the respiratory frequency can be obtained, and the method has the advantages of high accuracy and strong real-time performance.

The invention discloses a spectral confocal axial distance detecting method, device and equipment. The method comprises the following steps of driving a spectral confocal probe to axially scan the surface of an object to be detected, comparing reflected spectral signals of each scanning position, obtaining the maximum light intensity that each spectrometer pixel can generate in the measurement range, and grouping the maximum light intensity as a reference light intensity signal; obtaining a noise spectrum signal; and calculating dispersion reflectance spectrums of the respective scanning positions according to the reference light intensity signal, the noise spectrum signal and the reflection spectrum signal. The spectral confocal axial distance detecting method, device and equipment provided by the invention, by obtaining the maximum light intensity which can be generated by each spectrometer pixel in the measurement range as the reference light intensity signal, calculating the dispersion reflectance by the noise spectrum signal and further performing peak finding on the dispersion reflectance as a focus pixel ordinal value, make up the difference in intensity, transmittance and the like of the light of different wavelengths caused by the light source, and can effectively improve the accuracy of solving the focus pixel ordinal value.

Methods for processing low resolution mass spectrometry data, including providing the low resolution mass spectrometry data as abundance versus flight time data, converting the flight time axis of the low resolution mass spectrometry data to a calibrated mass axis, and converting that to retention time-based chromatographic data. The time-based data may then be converted back to abundance versus mass data and processed to create a mass spectrum.

The invention relates to a peak positioning method of overlapping FBG sensing signals, and belongs to the field of optical fiber sensing signal processing research of photoelectric detection. The method comprises the following steps: using continuous wavelet transform to process FBG reflected signals to eliminate the influence of signal noises on peak positioning accuracy; using a wavelet ridge peak finding algorithm to obtain peak initial positioning points of peak overlapping FBG signals with the continuity of extreme values at different scales; improving the wavelet ridge peak finding algorithm through matrix singular value decomposition, extracting wavelet ridges which can represent local characteristic information of the FBG reflected signals, and removing a pseudo maximum value affecting peak positioning; and combining peak energy with a signal-to-noise ratio to obtain accurate peak points of final overlapping peaks. By adopting the method, the peak overlapping problem of the FBGreflected signals can be effectively solved.

The invention discloses a BOTDR cross-correlation peak finding method based on defective spectrum splicing. The method comprises steps of in case of a certain scanning frequency, carrying out spectrum splicing on acquired defective spectrums; carrying out correlation operation on the spectrum splicing and standard Lorentzen curves to obtain the real peak value frequency of a Brillouin spectrum; and through a preorder experiment, determining spectrum splicing frequency and optimizing peak finding frequency on the basis of meeting error ranges required in actual application. According to the invention, by carrying out splicing processing on the data after measurement, the cross-correlation algorithm is properly used when the peak value frequency of the Brillouin spectrum by use of the defective spectrums, so efficiency and accuracy for carrying out Brillouin peak finding on the defective spectrums are improved; insensitivity to external interference of rapid change of the BOTDR is overcome; sensing effects of the BOTDR in an extreme environment are improved; and the method has an important meaning for actual engineering application.

The invention discloses a wavelength offset correction method, which comprises the following steps of: acquiring a reference spectrum and a spectrum to be corrected; calculating an intensity density function of each pixel in the spectrum to be corrected to obtain a polynomial coefficient matrix, wherein each group of polynomial coefficients in the polynomial coefficient matrix are coefficients ofthe intensity density function of one pixel in the spectrum to be corrected respectively; determining a pixel offset range; calculating a spectrum to be audited corresponding to each pixel offset according to the pixel offset in the pixel offset range and the polynomial coefficient matrix; determining the spectrum to be audited which is closest to the reference spectrum to obtain the optimal pixeloffset; correcting the spectrum to be corrected according to the optimal pixel offset and the polynomial coefficient matrix to obtain the spectrum after wavelength offset correction. The wavelength offset correction method can correct the non-integer multiple pixel offset of the spectral data without depending on a peak finding method. The method also discloses a wavelength offset correction device and a computer device.

The invention discloses a Brillouin spectrum peak finding method based on incomplete spectrum splicing. The method comprises performing splicing treatment on measured data, and on the basis of incomplete spectra, obtaining the peak frequency of real Brillouin spectra. The Brillouin spectrum peak finding method based on incomplete spectrum splicing remedies the insensitivity of a BOTDR (Brillouin optical time domain reflectometer) to rapidly-changed external interference, improves the sensing effects of the BOTDR in extreme environments and is significant to practical engineering application.

A breakaway interface between radiological information systems, imaging equipment and picture archive and communications systems has automated filtering and handling of multiple study work orders or affiliated work orders, while passing single study work orders through unaltered. The work orders are processed by the breakaway interface to consolidate multiple procedure or multiple study work orders into a single super order, which is then communicated, preferably using DICOM standard protocol, to an imaging machine. The imaging machine returns a single image sequence, and the breakaway interface will then break images away from the single image sequence into a plurality of grouped image sequences. The preferred grouping is based upon anatomical regions, and separate but adjacent anatomical regions will preferably share one or more images at the boundary between the adjacent regions. The exact number of shared images may preferably be preset at the system level. A number of different techniques for analyzing the single image sequence are proposed individually or in combination, including histogram analysis, peak finding techniques, moments of order analysis, evaluating information from one or more previous analyses, and evaluating image sequence series information to distinguish discrete imaging procedures.