A low-finesse all-fiber sinusoidal phase modulation interferometer for displacement measurement

Jin, Tao; Wang, Wei; Daul, Lars; Koenders, Ludger; Hou, Wenmei

doi:10.1016/j.optcom.2021.126997

Cited by 10 publications

(2 citation statements)

References 18 publications

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“…Figure 1 displays the schematic of the fibre-optic interferometer [16,28]. A monochromatic laser source with a wavelength of 1550 nm is powered with an optical fibre that maintains polarisation.…”

Section: Sensor Structure and Measurement Principlementioning

confidence: 99%

“…S. Sharma proposed a structure that introduces phase modulation between the fibre-optic end face and the target to be measured, which does not suffer from the problem of light intensity modulation incidental to light source modulation but introduces a complex alignment mechanism [15]. In order to increase the measuring distance, phase modulation is introduced by adding a reference light path with an electro-optic modulator (EOM) [16], but it also makes the interferometer a Mach-Zehnder structure, which introduces new errors.…”

Section: Introductionmentioning

confidence: 99%

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A Mach–Zehnder Fabry–Perot Hybrid Fibre-Optic Interferometer for a Large Measurement Range Based on the Kalman Filter

Wang,

Yang,

Jin

2024

Optics

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To solve the short working distance and small measurement range of an all-fibre interferometer, we proposed a Mach–Zehnder Fabry–Perot hybrid fibre-optic interferometry system based on sinusoidal phase modulation. In this paper, a low-finesse fibre interferometer with a larger linear operating range for displacement measurement is realised using a self-collimating probe and incorporating a Kalman filter-based phase demodulation algorithm. Through experimental comparisons, it is demonstrated that the interferometer proposed in this paper can effectively reduce the phase delay, compensate for the depth of modulation drift, and correct the error due to parasitic interference introduced by the optical path structure through the algorithm. A linear large measurement working range of 20 cm is realised.

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Section: Sensor Structure and Measurement Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%