Frequency Estimation Method From Digitized Waveform

Fujii, Yusaku; Hessling, Jan Peter

doi:10.1111/j.1747-1567.2008.00421.x

Cited by 21 publications

(19 citation statements)

References 16 publications

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“…The beat signals detected by PD1 and PD2 (PDA36A, Thorlabs) were digitized by a digitizer board (PCI-5105, National Instruments), and their frequencies were calculated using the zero-crossing fitting method (ZFM). 10 Figure 3(a) shows the frequencies of the beat signals. f rest was the time-averaged frequency measured using a fixed CC2.…”

Section: Resultsmentioning

confidence: 99%

Dual beat-frequencies laser Doppler interferometer

Takita

Ebara

Fujii

2011

Review of Scientific Instruments

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A dual beat-frequencies laser Doppler interferometer which can measure high speed back and forth motion is proposed and demonstrated. In this interferometer, the two frequencies, f(1) and f(2), emitted by a Zeeman laser are introduced into the signal beams. They are changed to f(1)' and f(2)' by Doppler shift f(Doppler), which is proportional to the velocity of the object. The use of the two beat signals of |f(1)' - f(2)| and |f(1) - f(2)'| appearing at two photodetectors enables to measure the velocity over the limitation v(c) = λ(f(1) - f(2))/2.

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Section: Resultsmentioning

confidence: 99%

Dual beat-frequencies laser Doppler interferometer

Takita

Ebara

Fujii

2011

Review of Scientific Instruments

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“…5. The ZFM: Zero-Crossing Fitting Method (12) which is proposed by one of authors was deployed to estimate the frequencies, f rest and f beat . Figure 6 shows following data analytical process for obtaining to determine the velocity, v, the displacement, x, acceleration, a, and impact force, F. The velocity, ν, can be obtained by using the following relation: ( 1) where λ air is the wavelength of signal beam and is equal to 632.8 nm.…”

Section: Resultsmentioning

confidence: 99%

Impact Response Measurement of a Plastic Container Using a Spherical-body Drop-tester

Kirdsiri

Saito

Takita

et al. 2016

The Proceedings of the 4th International Conference on Industrial Application Engineering 2016

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In this work, the impact test between a spherical body and a plastic container using the adapted Levitation Mass Method (LMM) is carried out for investigating the dynamic behaviors of clear plastic container on the collision of a spherical body. The precise value of time-varying parameters are investigated by using simple Doppler effect occurred between the slightly different of beat frequency and rest frequency. The five experiments are carried out with our proposed method, it is confirmed to have good reproducibility.

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“…The measurement duration of the digitizer is approximately 0.073 s. The frequencies ƒ beat and ƒ rest are accurately determined from the digitized waveforms of the output signals appearing at PD1 and PD2, respectively, using the recently developed Zero-Crossing Fitting method (ZFM) [40]. In our analysis, the sampling interval is defined by N = 500 periods of the signal waveform, which corresponds to 0.125 ms when ƒ beat is approximately 8 MHz.…”

Section: Methodsmentioning

confidence: 99%

“…The acceleration, displacement, and interval of the sphere are calculated from the velocity of the center of gravity of a metal ball. The light source used was a He-Ne laser in which the two wavelengths [39,40]. A high-speed camera is used to capture the images around the impact region, which shows the changes with the impact force.…”

Section: Introductionmentioning

confidence: 99%