Digital demodulation methods for fiber interferometers

Kudryashov, Alexis; Лиокумович, Л. Б.; Medvedev, A. V.

doi:10.3103/s1060992x13040061

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…6 The main concept of this method is that digital processing enables implementation of various mathematical procedures and there is no need to obtain the relatively simple signal like Eq. (3).…”

Section: Demodulation Methodsmentioning

confidence: 99%

“…Signal parameters were chosen according to the demodulation method protocol. 6 The additional modulation frequency was 10 kHz.…”

Section: Implementation Of the Demodulation Methodsmentioning

confidence: 99%

“…According to the method modulation phase values are A. Medvedev et al As it was demonstrated in Ref. 6, for the proper calculation of target phase φ S using triplet of samples {u (0) , u (1) , u (2) }, three phase samples…”

Section: Implementation Of the Demodulation Methodsmentioning

confidence: 99%

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Precise digital demodulation for fiber optic interferometer sensors

Medvedev

Berezhnoi

Kudryashov

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

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Different methods are used in the interferometer sensors for target signal extraction. Digital technologies provide new opportunities for precise signal detection. We have developed the principle of signal demodulation using an additional harmonic phase modulation and digital signal processing. The principle allows implementation of processing algorithms using different ratios between modulation and discretization frequencies. The expressions allowing calculation of the phase difference using the inverse trigonometric functions were derived. The method was realized in LabVIEW programming environment and was demonstrated for various signal shapes.

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Section: Demodulation Methodsmentioning

confidence: 99%

“…Signal parameters were chosen according to the demodulation method protocol. 6 The additional modulation frequency was 10 kHz.…”

Section: Implementation Of the Demodulation Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Precise digital demodulation for fiber optic interferometer sensors

Medvedev

Berezhnoi

Kudryashov

et al. 2016

Int. J. Mod. Phys. Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Using the capabilities now available in cost-effective signal acquisition real-time signal processing systems, a self-correcting synthetic-heterodyne demodulation system was proposed and implemented, which overcomes the need for prior calibration [1]. Research on exploiting the advantages of digital signal processing to the synthetic-heterodyne demodulation is ongoing such as the work reported in [8].…”

Section: Introductionmentioning

confidence: 99%

Improved synthetic-heterodyne Michelson interferometer vibrometer using phase and gain control feedback

2015

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Synthetic-heterodyne demodulation is a useful technique for dynamic displacement and velocity measurement using interferometric sensors as it can provide an output signal which is immune to interferometric drift. With the advent of cost effective, high-speed real-time signal processing systems and software, processing of the complex signals encountered in interferometry has become more feasible. In conventional synthetic-heterodyne demodulation schemes, to obtain the dynamic displacement or vibration of the object under test requires knowledge of the interferometer visibility and also the argument of two Bessel functions. In this paper, a new synthetic-heterodyne demodulation method is described leading to an expression for the dynamic displacement and velocity of the object under test that is significantly less sensitive to the received optical power. In addition, the application of two independent phase and gain feedback loops is used to compensate for the nonideal gain and phase response of the anti-aliasing filter required for the signal acquisition of the received wideband interferometer signal. The efficacy of the improved system is demonstrated by measuring the displacement sensitivity frequency response and linearity of a Piezoelectric Mirror-Shifter (PMS) over a range of 200 Hz-9 kHz. In addition, the system is used to measure the response of the PMS to triangular and impulse type stimuli. The experimental results show excellent agreement with measurements taken using two independent industry standard calibration methods.

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