Ultrasensitive Fiber Optic Inclinometer Based on Dynamic Vernier Effect Using Push–Pull Configuration

Wang, Shun; Yang, Yue; Mohanty, Lipi; Jin, Rui; Lu, Peixiang

doi:10.1109/tim.2022.3196445

Cited by 13 publications

(3 citation statements)

References 46 publications

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“…Fiber-optic levels are typically based on techniques such as fiber Bragg gratings [10], phase-shifted fiber Bragg gratings [11], and Fabry-Perot interferometers [12,13]. These methods mainly utilize wavelength-shift detection of Bragg fibers to obtain the measurement angle or employ two Fabry-Perot interferometers to establish the optical Vernier effect for angle measurement.…”

Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform

Fu,

Wang,

Lin

et al. 2023

Micromachines

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This paper proposes a two-dimensional precision level for real-time measurement using a zoom fast Fourier transform (zoom FFT)-based decoupling algorithm that was developed and integrated in an FPGA. This algorithm solves the contradiction between obtaining high resolution and obtaining high measurement speed, and achieves both high angle-resolution measurement and real-time measurement. The proposed level adopts a silicone-oil surface as the angle-sensitive interface and combines the principle of homodyne interference. By analyzing the frequency of the interference fringes, the angle variation can be determined. The zoom-FFT-based decoupling algorithm improves the system’s frequency resolution of the interference fringes, thereby significantly enhancing the angle resolution. Furthermore, this algorithm improves the efficiency of angle decoupling, while the angle decoupling process can also be transplanted to the board to realize real-time measurement of the level. Finally, a prototype based on the level principle was tested to validate the effectiveness of the proposed method. The principle analysis and test results showed that the angle resolution of the prototype improved from 9 arcsec to about 0.1 arcsec using this angle-solution method. At the same time, the measurement repeatability of the prototype was approximately ±0.2 arcsec. In comparison with a commercial autocollimator, the angle measurement accuracy reached ±0.6 arcsec.

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Section: Introductionmentioning

confidence: 99%

A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform

Fu,

Wang,

Lin

et al. 2023

Micromachines

View full text Add to dashboard Cite

show abstract

“…Over the past few years, there have been numerous reports and advancements in the field of electromagnetic and optical inclinometers [1]- [12]. However, the majority of these inclinometers are limited to measuring the inclination along a single known axis, and the sensor needs to be properly aligned with this axis.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Inclinometer/Tilt Sensor With a Large Dynamic Range Utilizing Half-Wavelength Microstrip Resonator

Andevari,

Olvera-Cervantes,

Saavedra

2023

IEEE Access

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This article presents a 2-D inclinometer consisting of two individual sensors oriented orthogonally to one another such that each sensor measures the tilt angle along its respective axis. The sensors are constructed using a combination of a half-wavelength microstrip transmission line on a printed circuit board and a rotating transmission line on an overlapping circuit board. As the inclination angle changes, the overall length of the resonator varies, leading to a shift in the resonance wavelength. This wavelength shift accurately represents the inclination variation. The experimental results demonstrate a sensitivity of 0.507 mm/ • and a resolution of 0.029 • for the sensor. The inclinometer offers a wide dynamic tilt angle measurement range of at least 80 • (±40 • ) along any axis in XY plane. Additionally, the proposed inclinometer exhibits simplicity, cost-effectiveness, and robustness.

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“…For biosensing applications, multimode interference devices offer competitive sensitivity, considering metamaterials [8]. Some of these applications involve slight angle deflection monitoring [9][10][11]. However, most fiber optic angle sensors are based on interferometric techniques: Mach-Zehnder Interferometer [12,13], Michelson Interferometer [14,15], Fabry-Perot Interferometer [16,17], Fiber Bragg Gratings [18,19], and Tapered Fibers [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Modal Analysis of Long Reflective Multimode Interferometer for Small Angle Detection and Temperature

et al. 2023

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This work presents the sensitive modal analysis of a long reflective multimode optical fiber device for angle and temperature. The reflective multimode interference optical fiber device was fabricated by splicing ~40 cm of multimode optical fiber (50/125). This structure provides a random interference reflection spectrum; the wavelength sensitivity analysis indicates that estimating the angle detection is impossible due to the several modes involved. However, by the phase analysis of the Fourier components, it was possible to detect slight angle deflection. Here, three spectral Fourier components were analyzed, and the maximal sensitivity achieved was 1.52 rad/°; the maximal angle variation of the multimode fiber was 3.4°. In addition, the thermal analysis indicates minimal temperature affectation (0.0065 rad/°C). Moreover, it was demonstrated that there is a strong dependence between the sensitivity and the m-order of the modes involved. Considering the fiber optic sensor dimensions and signal analysis, this device is attractive for numerous applications where slight angle detection is needed.

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Ultrasensitive Fiber Optic Inclinometer Based on Dynamic Vernier Effect Using Push–Pull Configuration

Cited by 13 publications

References 46 publications

A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform

A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform

Two-Dimensional Inclinometer/Tilt Sensor With a Large Dynamic Range Utilizing Half-Wavelength Microstrip Resonator

Sensitivity Modal Analysis of Long Reflective Multimode Interferometer for Small Angle Detection and Temperature

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