High stability and low harmonic distortion PGC demodulation technique for interferometric optical fiber sensors

Yu, Zhihua; Dai, Haolong; Zhang, Mingyu; Zhang, Jingjing; Liu, Li; Jin, Xing; Luo, Yuansheng

doi:10.1016/j.optlastec.2018.07.055

Cited by 38 publications

(12 citation statements)

References 11 publications

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“…Equation () can be rewritten as

S_{out} ((), t) = \arctan ([], \tan φ ((), t)) = φ ((), t) .

From 0 to 2π radians, there are three optimal values of C , which are 2.63 rad, 4.478 rad, and 6.087 rad 46,48 . When the modulation depth deviates, harmonic distortion will occur 49 …”

Section: Fast Interrogation Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Fast interrogation of dynamic low‐finesse Fabry‐Perot interferometers: A review

Liu

Peng

2021

Micro & Optical Tech Letters

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Low‐finesse fiber‐optic Fabry–Perot (F‐P) interferometric sensor has the advantages of high sensitivity, anti‐electromagnetic interference, and compact size, and is one of the most widely used optical fiber sensors. With the development of sensor design and demodulation algorithms, F‐P sensing technique plays an increasingly important role in high‐speed dynamic measurement, such as dynamic temperature or pressure, acoustic vibration, dynamic displacement, and distance. Signal demodulation methods largely determine the performance of the entire sensing system. Compared with quasi‐static measurement, high‐precision measurement of dynamic F‐P cavity is more challenging. The advancement of fast tunable laser technology in telecommunication field provides novel perspectives for demodulation methods and dynamic applications based on F‐P sensors. This article reviews the latest developments in fast interrogation techniques for dynamic low‐finesse F‐P sensors, including intensity demodulation, quadrature phase demodulation and absolute cavity length demodulation. In addition, array multiplexing and multi‐parameter measurement techniques are also involved.

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“…Equation () can be rewritten as

S_{out} ((), t) = \arctan ([], \tan φ ((), t)) = φ ((), t) .

From 0 to 2π radians, there are three optimal values of C , which are 2.63 rad, 4.478 rad, and 6.087 rad 46,48 . When the modulation depth deviates, harmonic distortion will occur 49 …”

Section: Fast Interrogation Techniquesmentioning

confidence: 99%

“…The key factors affecting the PGC demodulation effect include the laser intensity disturbance (LID) effect, 50,51 phase modulation depth, 46,48,49 and phase delay 52–56 . Due to the limitation of wavelength modulation range, PGC demodulation is suitable for demodulating F‐P sensors with long cavity length.…”

Section: Fast Interrogation Techniquesmentioning

confidence: 99%

Fast interrogation of dynamic low‐finesse Fabry‐Perot interferometers: A review

Liu

Peng

2021

Micro & Optical Tech Letters

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“…In order to obtain the ∆ l s and ∆ l p in Equation (3), the PGC demodulation algorithm is adopted. The PGC demodulation technique, such as PGC-Arctan and PGC-DCM, has been widely used in optical interferometer due to its high sensitivity, large dynamic range and good linearity [ 13 , 14 , 15 ]. In the PGC demodulation process, the interference signals in Equations (1) and (2) are multiplied with the fundamental carrier and second-harmonic carrier and a pair of quadrature components are obtained.…”

Section: Measurement Principlesmentioning

confidence: 99%

Sinusoidal Phase-Modulated Angle Interferometer for Angular Vibration Measurement

Wang

Yang

Chen

et al. 2021

Sensors

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Primary angular vibration calibration devices based on laser interferometers play a crucial role in evaluating the dynamic performance of inertial sensing devices. Here, we propose a sinusoidal phase-modulated angle interferometer (SPMAI) to realize angular vibration measurements over a frequency range of 1–1000 Hz, in which the sinusoidal measurement retro-reflector (SMR) and the phase generation carrier (PGC) demodulation algorithm are adopted to track the dynamic angle variation. A comprehensive theoretical analysis is presented to reveal the relationship between demodulation performance of the SPMAI and several factors, such as phase modulation depth, carrier phase delay and sampling frequency. Both the simulated and experimental results demonstrate that the proposed SPMAI can achieve an angular vibration measurement with amplitude of sub-arcsecond under given parameters. Using the proposed SPMAI, the frequency bandwidth of an interferometric fiber-optic gyroscope (IFOG) is successfully determined to be 848 Hz.

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“…Fiber-optic Michelson interferometric sensors have been widely researched for monitoring vibration, soundwave, acceleration, liquid refractive index, magnetic field, flow velocity and strain because of their advantages such as high sensitivity, light weight, electromagnetic immunity and capability of multiplexing [ 1 , 2 , 3 , 4 , 5 , 6 ]. Several demodulation technologies have been put forward to interrogate the phase signal of fiber-optic Michelson interferometric sensors, including phase generate carrier (PGC) demodulation [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], 3 × 3 coupler demodulation [ 15 , 16 , 17 , 18 ] and spectrum demodulation [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Large-Dynamic-Range and High-Stability Phase Demodulation Technology for Fiber-Optic Michelson Interferometric Sensors

Zhang

Lü

et al. 2022

Sensors

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A large-dynamic-range and high-stability phase demodulation technology for fiber-optic Michelson interferometric sensors is proposed. This technology utilizes two output signals from a 2 × 2 fiber-optic coupler, the interferometric phase difference of which is π. A linear-fitting trigonometric-identity-transformation differential cross-multiplication (LF-TIT-DCM) algorithm is used to interrogate the phase signal from the two output signals from the coupler. The interferometric phase differences from the two output signals from the 2 × 2 fiber-optic couplers with different coupling ratios are all equal to π, which ensures that the LF-TIT-DCM algorithm can be applied perfectly. A fiber-optic Michelson interferometric acoustic sensor is fabricated, and an acoustic signal testing system is built to prove the proposed phase demodulation technology. Experimental results show that excellent linearity is observed from 0.033 rad to 3.2 rad. Moreover, the influence of laser wavelength and optical power is researched, and variation below 0.47 dB is observed at different sound pressure levels (SPLs). Long-term stability over thirty minutes is tested, and fluctuation is less than 0.36 dB. The proposed phase demodulation technology obtains large dynamic range and high stability at rather low cost.

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High stability and low harmonic distortion PGC demodulation technique for interferometric optical fiber sensors

Cited by 38 publications

References 11 publications

Fast interrogation of dynamic low‐finesse Fabry‐Perot interferometers: A review

Fast interrogation of dynamic low‐finesse Fabry‐Perot interferometers: A review

Sinusoidal Phase-Modulated Angle Interferometer for Angular Vibration Measurement

Large-Dynamic-Range and High-Stability Phase Demodulation Technology for Fiber-Optic Michelson Interferometric Sensors

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