An Extrinsic Fibre Optic Interferometer with Possible Signal Fading Compensation for Vibrometric Applications

Seat, Han Cheng; Pullteap, Saroj; Bosch, Thierry

doi:10.1109/imtc.2005.1604574

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…The resulting interference intensities for both the x and y components can thus be simply detected as the sums of their respective fields [10] (3) and (4)] which can be detected separately in this case. By oscillating the intended target, a Doppler effect is "seen" by the sensing fiber and can be observed as a phase lag or lead between the two respective interference signals.…”

Section: Dual-cavity Generation Fiber Interferometermentioning

confidence: 99%

“…Hence, no additional reference arm is required, leading to a reduction in optical components and hence cost savings when compared to either the Michelson or Mach-Zehnder interferometer. Moreover, the FFPI also exhibits superior performance in terms of the frequency bandwidth, sensitivity as well as precision [5][6][7], and has been frequently employed in velocity, strain, acoustics, temperature, micro-assembly process and vibration measurement [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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An extrinsic fiber Fabry-Perot interferometer for dynamic displacement measurement

Pullteap

Seat²

2014

Photonic Sens

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A versatile fiber interferometer was proposed for high precision measurement. The sensor exploited a double-cavity within the unique sensing arm of an extrinsic-type fiber Fabry-Perot interferometer to produce the quadrature phase-shifted interference fringes. Interference signal processing was carried out using a modified zero-crossing (fringe) counting technique to demodulate two sets of fringes. The fiber interferometer has been successfully employed for dynamic displacement measurement under different displacement profiles over a range of 0.7 µm to 140 µm. A dedicated computer incorporating the demodulation algorithm was next used to interpret these detected data as well as plot the displacement information with a resolution of λ/64. A commercial displacement sensor was employed for comparison purposes with the experimental data obtained from the fiber interferometer as well as to gauge its performance, resulting in the maximum error of 2.8% over the entire displacement range studied.

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Section: Dual-cavity Generation Fiber Interferometermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An extrinsic fiber Fabry-Perot interferometer for dynamic displacement measurement

Pullteap

Seat²

2014

Photonic Sens

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“…Further, any variation in the sensing cavity length can also contribute to the displacement error generated during the vibration analysis via the phase term between the reference and sensing beams 2,m AO = z 2d (4) A where d is the distance of the sensing cavity and n is the refractive index of the cavity (n = 1 for air). The detected interference intensity thus undergoes a corresponding variation in its modulation term given by [7] I=Ir +1s +2 VIrIs cos(AO) (5) where Ir and Is are the intensities of the reference and sensing beams respectively, which are the DC components and, AO corresponds to the phase difference between the reference and sensing beams, respectively.…”

Section: Proposed Approachmentioning

confidence: 99%

“…In a previous paper, we introduced a dual-cavity fibre Fabry-Perot interferometric sensor for vibration measurement with non-ambiguous directional discrimination of a vibrating target and described the potential of this sensor for compensating polarisation-induced signal fading [7]. In this work, errors due to variations in the laser cavity temperature and distance-to-target from vibration measurements carried out using the sensor are investigated.…”

Section: Introductionmentioning

confidence: 99%

Temperature and distance-dependent errors in a dual-cavity fibre Fabry-Perot interferometer for vibration analysis

Pullteap

Seat

Bosch

2007

2007 IEEE Instrumentation &Amp; Measurement Technology Conference IMTC 2007

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Fabry-Perot interferometers developed for vibrometric applications have various advantages. However, they are not free from environmentally induced errors. In this paper, we attempt to investigate the temperature and distance-dependent errors in displacement measurement obtained using a fibre Fabry-Perot vibration sensor. By varying the temperature ofthe laser diode via a temperature controller module, the wavelength variations as a function of temperature in the emitted spectrum were measured. These shifts were then converted into the desired displacement values and compared to those under typical operating conditions (at 25°C). In another experimental setup, the distance between the sensing arm and the target was variedfrom 72 -1172 mm and the measured displacement amplitudes analysed, giving a possible range ofdisplacements. A commercial displacement sensor has been used as reference for comparison in the distance-to-target study, resulting in a maximum percentage displacement error of0. 668 %.

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“…As high-energy light meets the measured sample, such as direct or via multireflection between measured gaps, this might cause the measured sample to absorb the light or interact with the light, to expand, to deform, or become damaged. 28) Seat et al, 29) chose a long wavelength for experimently preformed typical solutions with additional measurements of cavities, and using wavelength and phase-shift-detection techniques, but these were generally costly to implement and involved complicated processing schemes. On the other hand, the resolution was only =8.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Applications of Tapered Fiber Optical Sensors for 1310 nm Wavelength

Hwang¹,

Cheng²,

Su³

2013

Jpn. J. Appl. Phys.

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Optical sensors for displacement measurement and fluorescence probes were designed and experimentally studied. This is the first time we used photonic sensors for displacement measurement and fluorescence probes at the same time using a long-wavelength (1310 nm) photon beam in the reflective mode. A tapered fiber sensor was chosen to increase the dynamic range for fluorescence probes. The results showed that the tapered fiber sensor exhibited a high resolution of 12 nm and a better dynamic range of 2 mm in our system. The relationship between resolution and dynamic range was experimentally found to vary with tapered fiber tilt angle. The precise diameter of the fiber microlens was measured. These were the characteristics considered in the manufacturing of our chosen device. Moreover, these novel 1310-nm-wavelength tapered fiber sensors with high resolution, good dynamic range, better reliability, and low cost may provide multipurpose applications, such as those in telecommunication systems, commercial measurements, and military inspection.

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An Extrinsic Fibre Optic Interferometer with Possible Signal Fading Compensation for Vibrometric Applications

Cited by 8 publications

References 12 publications

An extrinsic fiber Fabry-Perot interferometer for dynamic displacement measurement

An extrinsic fiber Fabry-Perot interferometer for dynamic displacement measurement

Temperature and distance-dependent errors in a dual-cavity fibre Fabry-Perot interferometer for vibration analysis

Characteristics and Applications of Tapered Fiber Optical Sensors for 1310 nm Wavelength

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