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correlation algorithm AND SAMPLING TECHNIQUES FOR ESTIMATING THE SIGNAL-TO-NOISE RATIO OF THE ELECTROCARDIOGRAM

JOURNAL OF BIOMEDICAL ENGINEERING 1992年第6期14卷 516-520页

作者： CHARAYAPHAN, C MARBLE, AE NUGENT, ST SWINGLER, D TECH UNIV NOVA SCOTIA DEPT ELECT ENGNHALIFAX B3J 2X4NSCANADA DALHOUSIE UNIV DEPT SURGHALIFAXNSCANADA DALHOUSIE UNIV DEPT ENGNHALIFAXNSCANADA ST MARYS UNIV HALIFAX B3H 3C3NSCANADA

An algorithm, based on correlation techniques, is proposed for estimating the signal-to-noise ratio of very low frequency signals contaminated by white and flicker noise. Sampling techniques based on converting a single continuous signal into two time series that satisfy the requirements of cross-correlation functions are proposed. The algorithm has been tested on simulated data and the electrocardiogram transduced from ten patients.

关键词： SIGNAL-TO-NOISE SAMPLING TECHNIQUES correlation algorithm

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A hybrid method based on Band Pass Filter and correlation algorithm to improve debris sensor capacity

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2017年第0期82卷 1-12页

作者： Hong, Wei Wang, Shaoping Liu, Haokuo Tomovic, Mileta M. Chao, Zhang Beihang Univ Sch Automat Sci & Elect Engn Beijing 100191 Peoples R China Sci & Technol Aircraft Control Lab Beijing 100191 Peoples R China Old Dominion Univ Coll Engn & Technol Norfolk VA 23529 USA

The inductive debris detection is an effective method for monitoring mechanical wear, and could be used to prevent serious accidents. However, debris detection during early phase of mechanical wear, when small debris (<100 um) is generated, requires that the sensor has high sensitivity with respect to background noise. In order to detect smaller debris by existing sensors, this paper presents a hybrid method which combines Band Pass Filter and correlation algorithm to improve sensor signal-to-noise ratio (SNR). The simulation results indicate that the SNR will be improved at least 2.67 times after signal processing. In other words, this method ensures debris identification when the sensor's SNR is bigger than 3 dB. Thus, smaller debris will be detected in the same SNR. Finally, effectiveness of the proposed method is experimentally validated. (C) 2016 Published by Elsevier Ltd.

关键词： Inductive debris sensor Real-time oil monitoring Signal processing correlation algorithm Band Pass Filter

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Extracting the weak distorted fringes on the dragonfly wing by a correlation algorithm

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OPTICS AND LASER TECHNOLOGY 2001年第7期33卷 493-497页

作者： Cai, ZJ Zeng, LJ Feng, ZJ Tsing Hua Univ Dept Precis Instruments State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China

We have proposed a simple correlation algorithm to extract weak distorted fringes buried in both background noise and random noise. The relationship among threshold value, signal to noise ratio and least frame number was discussed. The method, is efficiency to measure the shape of an object with low diffuse reflectivity. We have successfully applied the method to measure the shape of a dragonfly wing. (C) 2001 Elsevier Science Ltd. All rights reserved.

关键词： correlation algorithm weak signal fringe pattern dragonfly wing

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A Measuring Method for Angular Displacement Based on correlation algorithm

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JOURNAL OF COMPUTERS 2012年第10期7卷 2376-2382页

作者： Yan, Ping He, Yan Yi, Runzhong Liu, Fei Chen, Guorong Chongqing Univ State Key Lab Mech Transmiss Chongqing Peoples R China Chongqing Univ Sci & Technol Sch Elect & Informat Engn Chongqing Peoples R China

The existing angular displacement measurement methods rely on the manufacturing precision of the fixed-plate and moving-plate with high manufacturing cost, and it is difficult to overcome a static error and drift for the static measurement method. A kind of angular displacement measuring method based on correlation algorithm is presented with the characteristics of a low manufacturing cost, high precision, anti-noise and anti-partially damaged properties and so on. The method is that firstly full circle broadband or white noise, random data is a pre-prepared coaxially in a rotating body, then the periodic random signal is continuously formed using pickup head reads this data in the basic uniform rotation process of the rotating body. The instantaneous angular displacement of the pickup head relative to the rotating body is obtained by means of the correlation operations between the periodic random signal and the signal sequence of pre-stored data. The angular displacement among the different pickup heads is gained by subtraction for the instantaneous angular displacement of different pickup heads relative to the rotating body at the same instant. The functional relationship between the relative angular displacement of the different pickup heads and the measured angular displacement is determined by linkage equations, which is used to calculate the measured angular displacement. Furthermore, the schematics of detective devices and the principle of the signal processing are developed to implement the method.

关键词： angular disposition signal processing correlation algorithm measurement

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Novel cross-correlation algorithm for reducing noise-related errors in array type optical triangulation displacement sensors

Novel cross-correlation algorithm for reducing noise-related...

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Conference on Testing, Reliability, and Applications of Optoelectronic Devices

作者： Kim, KC Oh, SB Kim, SH Kwak, YK Korea Adv Inst Sci & Technol Dept Mech Engn Yusong Gu Taejon 305701 South Korea

ISBN: (纸本)0819439630

Optical triangulation displacement sensors are widely used for their non-contact measurement characteristics, sub-micron order resolution, simple structure, and long operation range. However, errors originating from surface inclination, speckle effect, light source fluctuation, and detector noise limit the wider use. In order to minimize these errors, the structure for optical triangulation displacement sensors, which is composed of an incoherent source and a linear CCD, has been proposed. But using a linear CCD causes several problems in signal processing. In this paper, we propose an adequate signal processing system for the proposed structure. With the help of the proposed algorithm, the limited resolution problem of CCD can be solved.

关键词： correlation algorithm displacement measurement optical sensor optical triangulation signal processing algorithm linear CCD

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Error Analysis for correlation algorithm Based Servo Valve Frequency Characteristic Measurement

Error Analysis for Correlation Algorithm Based Servo Valve F...

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4th International Conference on Measuring Technology and Mechatronics Automation (ICMTMA 2012)

作者： Chang, Huayao Wang, Junzheng Zhao, Jiangbo Wang, Shoukun Beijing Inst Technol Sch Automat Beijing 100081 Peoples R China

ISBN: (纸本)9783037852842

A fault diagnosis based on bond graph model is proposed for hydraulic variable pitch system. Because the knowledge representation of bond graph model can provide information of cause and effect between components, a bond graph model of hydraulic variable pitch system is given above rated wind speed. A fault tree, using cause and effect analysis by back propagation, is developed. Qualitative value of parameters is assigned and the fault source is detected by analyzing boundary parameters of fault tree. Comparing with quantitative fault diagnosis based on model, the bond graph fault diagnosis is more flexible and has good completeness.

关键词： correlation algorithm error analysis frequency characteristic

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Near-infrared aberration tracking using a correlation algorithm on the Galactic Center 4

Near-infrared aberration tracking using a correlation algori...

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Conference on Adaptive Optics Systems IV

作者： Anugu, Narsireddy Garcia, Paulo Amorim, Antonio Gordo, Paulo Eisenhauer, Frank Perrin, Guy Brandner, Wolfgang Straubmeier, Christian Perraut, Karine Univ Porto Fac Engn Lab SIM Unidade FCT 4006 P-4200465 Oporto Portugal Max Planck Inst Extraterr Phys D-85741 Garching Germany SIM P-1749016 Lisbon Portugal FCUL P-1749016 Lisbon Portugal Observ Paris F-75014 Paris France MaxPlanck Inst Astron Heidelberg Germany Univ Cologne Cologne Germany IPAG Grenoble France

ISBN: (纸本)9780819496164

The GRAVITY acquisition camera has four 9x9 Shack-Hartmann sensors operating in the near-infrared. It measures the slow variations of a quasi-distorted wavefront of four telescope beams simultaneously, by imaging the Galactic Center field. The Shack-Hartmann lenslet images of the Galactic Center are generated. Since the lenslet array images are filled with the crowded Galactic Center stellar field, an extended object, the local shifts of the distorted wavefront have to be estimated with a correlation algorithm. In this paper we report on the accuracy of six existing centroid algorithms for the Galactic Center stellar field. We show the VLTI tunnel atmospheric turbulence phases are reconstructed back with a precision of 100 nm at 2 s integration.

关键词： adaptive optics correlation algorithm aberration sensing wavefront sensing optical and infrared interferometry GRAVITY VLTI

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A novel track correlation algorithm for radar data fusion

A novel track correlation algorithm for radar data fusion

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7th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： Wu, ZeMin PLAUST Inst Commun Engn Nanjing Jiangsu Peoples R China

ISBN: (纸本)9781424462520

In this paper, a novel topology sequence calculation method is proposed and applied to track correlation algorithm. Based on attribute of topology sequence, tracks from different sensors will be same when there are no errors in sensor's measurement. In order to recognize track from blurred measurement, hypothesis verification is used. Detailed experimental results on such correlation algorithm confirm that topology sequence is robust to range and angle error of sensor measurement, not only including random error, but also including system error.

关键词： correlation Detectors Noise Radar tracking Topology blurred measurement correlation algorithm correlation methods hypothesis verification radar data fusion radar signal processing sensor fusion sensor measurement topology sequence topology sequence calculation method track correlation algorithm

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Chromatic confocal displacement measurment based on correlation algorithm

Chromatic confocal displacement measurment based on correlat...

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2nd International Conference on Mechanics and Control Engineering (ICMCE 2013)

作者： Niu, Chun-Hui Lv, Yong Beijing Informat Sci & Technol Univ Photoelect Sch Beijing 100192 Peoples R China

ISBN: (纸本)9783037859087

Chromatic confocal technique application in displacement measurement is studied theoretically and experimentally, a set of refractive lenses are designed and a measurement system is established. correlation fitting method is proposed to fit spectrum curve and find peak wavelength. Results with use of correlation fitting method are compared with Gaussian and smoothing spline fitting methods. It indicate that correlation fitting method have higher extracting accuracy of peak wavelength and smaller RMSE of linear fitting due to narrower and smoother correlation curve.

关键词： chromatic confocal technique correlation algorithm displacement sensor

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On-Chip Multimode WGM Microresonator with Cross-correlation algorithm for Enhanced Sensing

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LASER & PHOTONICS REVIEWS 2024年第8期18卷 2301303-2301303页

作者： Mao, Wenbo Li, Fu Jia, Di Zhang, Qian Yang, Lan Washington Univ Dept Elect & Syst Engn St Louis MO 63130 USA Nankai Univ Sch Phys Tianjin 300071 Peoples R China

Optical whispering-gallery-mode (WGM) microresonators emerge as a frontrunner for precision measurement due to their high sensitivity and compact footprint. They have demonstrated superior capabilities in detecting a wide range of objects, spanning from variations in temperature, humidity, and magnetic field, to local perturbations caused by viruses or nanoparticles. Traditional methods often rely on monitoring spectral changes in a single WGM resonance to extract the relevant information of sensing targets. However, in scenarios involving multiple sensing targets of interest (e.g., molecule detection in a temperature-fluctuating environment), analyzing only one resonant mode may be insufficient, leading to inaccuracies or misinterpretations in deriving target information. To address this issue, a multimode-based cross-correlation algorithm is proposed to distinguish local perturbations from global environmental fluctuations. For validation, on-chip silicon microresonators and pulley bus waveguides are integrated for robust multimode excitation. A proof-of-concept experiment demonstrates the effectiveness of this method in detecting nanoparticles in an environment with temperature changes. This approach showcases versatility and applicability in various optical sensors, introducing new prospects for achieving high-sensitivity sensing through scalable integrated photonic platforms. On-chip whispering-gallery-mode (WGM) optical microdisk resonators and a multimode cross-correlation algorithm are proposed and demonstrated on a silicon-on-insulator (SOI) platform. They feature the capabilities to differentiate local sensing targets of interest from global environmental perturbations. A proof-of-concept for nanoparticle detection in variable temperatures is showcased, highlighting advancements in high-sensitivity sensing on integrated photonic platforms. image

关键词： correlation algorithm multimode optical sensing silicon photonics

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