Ultrasensitive Strain Sensing by Using Two Parallel Structured Fabry--Perot Interferometers in Cascaded Connection

Wang, D. N.; Cui, Xinlei; Zhang, Hua; Deng, Jun

doi:10.1109/jlt.2020.3038238

Cited by 22 publications

(3 citation statements)

References 13 publications

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“…Therefore, there is another optical cavity (Cavity-3) bounded between the interfaces of M1 and M3 with an effective cavity length of L1 + L2 = 639.25 µm. The reflection of the FPI is the result of multi-beam coherent superposition, and it can be well-described using a three-reflector model [29][30][31][32]. The relationship between the incident, reflected, and transmitted electric fields at each interface is depicted in Figure 2c.…”

Section: Sensing Principlementioning

confidence: 99%

“…When light is emitted from the SMF to the sensor, reflections occur at M1, M2, and M3 interfaces. The corresponding electric fields E1, E2, and E3 of the reflected beams can be expressed as follows: The reflection of the FPI is the result of multi-beam coherent superposition, and it can be well-described using a three-reflector model [29][30][31][32]. The relationship between the incident, reflected, and transmitted electric fields at each interface is depicted in Figure 2c.…”

Section: Sensing Principlementioning

confidence: 99%

See 1 more Smart Citation

Compact Harmonic Vernier Sensor Based on an In-Fiber FPI with Three Reflector System for Simultaneous Gas Pressure and Temperature Measurement

Dan

Dang

et al. 2023

Sensors

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In this work, we proposed a sensitivity-enhanced temperature sensor, a compact harmonic Vernier sensor based on an in-fiber Fabry–Perot Interferometer (FPI), with three reflective interfaces for the measurement of gas temperature and pressure. FPI consists of air and silica cavities formulated by single-mode optical fiber (SMF) and several short hollow core fiber segments. One of the cavity lengths is deliberately made larger to excite several harmonics of the Vernier effect that have different sensitivity magnifications to the gas pressure and temperature. The spectral curve could be demodulated using a digital bandpass filter to extract the interference spectrum according to the spatial frequencies of resonance cavities. The findings indicate that the material and structural properties of the resonance cavities have an impact on the respective temperature sensitivity and pressure sensitivity. The measured pressure sensitivity and temperature sensitivity of the proposed sensor are 114 nm/MPa and 176 pm/°C, respectively. Therefore, the proposed sensor combines ease of fabrication and high sensitivity, making it great potential for practical sensing measurements.

show abstract

Section: Sensing Principlementioning

confidence: 99%

Section: Sensing Principlementioning

confidence: 99%

Compact Harmonic Vernier Sensor Based on an In-Fiber FPI with Three Reflector System for Simultaneous Gas Pressure and Temperature Measurement

Dan

Dang

et al. 2023

Sensors

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show abstract

“…However, if the machining error of 2 µm is induced, the M-factor will be reduced from 48.08 times to 16.45 times, which is only 34.2% of the ideal state, shown in Figure 1. The high M-factor usually needs a ∆ under a sub-micron level, however, in the actual process, the micron-level error is hard to avoid, so most of the M-factor of the TVE FPI is less than 30 times [22][23][24][25][26]. Second, an ultra-high-sensitivity TVE FPI is also limited in the demodulation method using envelope tracking.…”

Section: Introductionmentioning

confidence: 99%

Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI

Zhou

Song²,

Zhou³

et al. 2022

Sensors

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In this study, an ultra-high-sensitivity fiber humidity sensor with a chitosan film cascaded Fabry–Perot interferometer (FPI) based on the harmonic Vernier effect (HVE) is proposed and demonstrated. The proposed sensor can break the limitation of the strict optical path length matching condition in a traditional Vernier effect (TVE) FPI to achieve ultra-high sensitivity through the adjustment of the harmonic order of the HVE FPI. The intersection of the internal envelope tracking method allows spectra demodulation to no longer be limited by the size of the FSR of the FPI. The sensitivity of the proposed sensor is −83.77 nm/%RH, with a magnification of −53.98 times. This work acts as an excellent guide in the fiber sensing field for the further achievement of ultra-high sensitivity.

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Ultra-sensitive strain sensor based on Sagnac interferometer with different length panda fiber

Gao,

Jiang,

et al. 2024

Infrared Physics & Technology

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Ultrasensitive Strain Sensing by Using Two Parallel Structured Fabry--Perot Interferometers in Cascaded Connection

Cited by 22 publications

References 13 publications

Compact Harmonic Vernier Sensor Based on an In-Fiber FPI with Three Reflector System for Simultaneous Gas Pressure and Temperature Measurement

Compact Harmonic Vernier Sensor Based on an In-Fiber FPI with Three Reflector System for Simultaneous Gas Pressure and Temperature Measurement

Ultra-High-Sensitivity Humidity Fiber Sensor Based on Harmonic Vernier Effect in Cascaded FPI

Ultra-sensitive strain sensor based on Sagnac interferometer with different length panda fiber

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