Noncontact Distance and Amplitude-Independent Vibration Measurement Based on an Extended DACM Algorithm

Wang, Jingyu; Wang, Xiang; Chen, L.; Huangfu, Jiangtao; Li, Changzhi; Ran, Lixin

doi:10.1109/tim.2013.2277530

Cited by 192 publications

(87 citation statements)

References 19 publications

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“…The differentiate and cross multiply (DACM) [59] algorithm applies the computation of instantaneous frequency (51). The extended DACM algorithm [57] is free of non-linear problems. It is capable of measuring time-varying vibration and complex movement patterns.…”

Section: Doppler Signal Extractionmentioning

confidence: 99%

Vibration parameter estimation methods for ultrasonic measurement systems – a review

Singh

Sumathi

2015

IET Science, Measurement & Technology

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A review of vibration signal estimation techniques employed in ultrasonic vibration measurement systems is presented. The review focuses on the Doppler signal extraction methods including the theory and analysis pertaining to the background of ultrasonic vibration measurement techniques. The phase modulated received signal in the vibration measurement system involves constant phase shift because of ultrasonic path length, phase shift introduced by Doppler effect because of vibrating object and the parametric phase shift caused by interaction of high frequency ultrasonic wave and low pressure developed by vibrating object. Among the three phase shifts, the Doppler phase shift contains the vibrating signal information and the extraction of Doppler signal helps in knowing the velocity of the vibrating object, amplitude and phase of the vibration. Various techniques of Doppler phase shift retrieval are categorised based on the modulation index estimation procedures from the received ultrasonic signal. An analysis is made based on the information retrieval methods for estimation of vibration signal parameters, range of the vibration amplitude, frequency and the preferable carrier frequency for transmission. Further, the analysis also presents various applications in which ultrasonic vibration measurements system are employed successfully.

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Section: Doppler Signal Extractionmentioning

confidence: 99%

Vibration parameter estimation methods for ultrasonic measurement systems – a review

Singh

Sumathi

2015

IET Science, Measurement & Technology

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“…Other phase demodulation methods also could be performed to extract the phase from the in-phase and quadrature component pair, such as differentiate and cross multiply [23], [24] and Kalman filters [23]. A similar process is also computed for the reference signal, ultimately measuring the phase difference between the reference signal and the VCO signals.…”

Section: Heterodyne Interferometry Signal Processingmentioning

confidence: 99%

Dynamic Doppler Frequency Shift Errors: Measurement, Characterization, and Compensation

Wang

Ellis

2015

IEEE Trans. Instrum. Meas.

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Positioning calibration under dynamic conditions is becoming increasingly of interest for high precision fields, such as additive manufacturing and semiconductor lithography. Heterodyne interferometry is often used to calibrate a stage's position because interferometry has a high dynamic range and direct traceability to the meter. When using heterodyne interferometry, filtering is routinely performed to process and determine the measured phase change, which is proportional to the displacement from one target location to another. The filtering in the signal processing introduces a phase delay dependent on the detection frequency, which leads to displacement errors when target velocity is non-constant as is the case in dynamic calibrations. This paper presents a phase delay compensation method by measuring instantaneous detection frequency and solving for the corresponding phase delay in a field-programmable gate array (FPGA) in real time. The FPGA hardware-in-the-loop simulation shows that this method can significantly decrease the displacement error from ±100's nm to ±3 nm in dynamic cases and it will still keep subnanometer resolution for quasi-static calibrations.Index Terms-Displacement measurement, dynamic response, field-programmable gate arrays (FPGAs), interferometry, phase measurement.

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“…Recently, contactless vital sign (VS) detection has drawn wide attention and achieved great achievements [1][2][3][4].The electromagnetic detection is regarded as the most promising technique, which can acquire VS in the range-frequency matrix. Ultra-wide band (UWB) impulse radar has been widely applied in indoor target localization, VS detection, and human fall detection by employing the continuous wave [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

`Through-wall human being detection using UWB impulse radar

Liang

Zhang

et al. 2018

J Wireless Com Network

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Ultra-wideband (UWB) impulse radar plays an important role in contactless vital sign (VS) detection. The VS can be extracted remotely by acquiring the oscillations in the human chest. Unfortunately, it is usually challenging to identify VS due to the low signal-to-noise ratio (SNR) only based on the traditional fast Fourier transform (FFT) especially in complicated conditions. To extract VS accurately, this paper presents a new scheme by analyzing the skewness characteristic of the received UWB impulses, which are modulated by life activities. The distance from the human subject to the radar antenna can be calculated by performing the discrete short-time Fourier transform (DSFT) on skewness. The frequency of human respiratory movement can be estimated based on the developed ensemble empirical mode decomposition (EEMD)-based accumulation technique by canceling out the harmonics effectively. The performance of the developed detection method is tested with several experiments carried out in different environments.

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Noncontact Distance and Amplitude-Independent Vibration Measurement Based on an Extended DACM Algorithm

Cited by 192 publications

References 19 publications

Vibration parameter estimation methods for ultrasonic measurement systems – a review

Vibration parameter estimation methods for ultrasonic measurement systems – a review

Dynamic Doppler Frequency Shift Errors: Measurement, Characterization, and Compensation

`Through-wall human being detection using UWB impulse radar

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