Performance improvement of on-chip mid-infrared waveguide methane sensor using wavelet denoising and Savitzky-Golay filtering

Ji, Jialin; Huang, Yijun; Pi, Mingquan; Zhao, Huan; Peng, Zhimin; Li, Chunguang; Wang, Qing; Wang, Yiding; Zheng, Cheng

doi:10.1016/j.infrared.2022.104469

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…C is the gas concentration, α gas is the gas absorption coefficient, and L denotes waveguide length. γ is the ratio of evanescent field, expressed as 23

\gamma =\frac{{n}_{{\rm{g}}}{\iint }_{\text{gas}}\varepsilon {| E| }^{2}dxdy}{{\iint }_{\text{total}}\varepsilon {| E| }^{2}dxdy},

where n g is the group refractive index of the waveguide mode, E is the electric field, and ε is the permittivity.…”

Section: Principle and Simulation Optimizationmentioning

confidence: 99%

Theoretical and experimental investigation of chalcogenide suspended waveguide gas sensor

Huang,

Wang,

et al. 2023

Micro & Optical Tech Letters

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To address the issues of low ratio of evanescent field (γ) and high reflectivity between waveguide cross‐section and gas for the mid‐infrared waveguide sensors, we propose a chalcogenide (ChG) suspended waveguide with Ge28Sb12Se60 as the core layer and silica (SiO2) as the buffer layer. The SiO2 beneath the waveguide core ridge structure is removed to create suspended structure. The waveguide sensing performance is obtained using a 10% methane (CH4) sample. The fabricated waveguide exhibits a γ of 112%, which is a 10% improvement compared to a free‐space optical sensor with the same optical path length. The good agreement between the theoretical and experimental results of γ confirms the reliability of our theoretical investigation approach. The influences of fabrication error, environmental temperature, and pressure on sensing performances are discussed. This work provides theoretical guidance for designing waveguide structures with large γ, contributing to the further enhancement of on‐chip sensor performance.

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“…C is the gas concentration, α gas is the gas absorption coefficient, and L denotes waveguide length. γ is the ratio of evanescent field, expressed as 23

\gamma =\frac{{n}_{{\rm{g}}}{\iint }_{\text{gas}}\varepsilon {| E| }^{2}dxdy}{{\iint }_{\text{total}}\varepsilon {| E| }^{2}dxdy},

where n g is the group refractive index of the waveguide mode, E is the electric field, and ε is the permittivity.…”

Section: Principle and Simulation Optimizationmentioning

confidence: 99%

Theoretical and experimental investigation of chalcogenide suspended waveguide gas sensor

Huang,

Wang,

et al. 2023

Micro & Optical Tech Letters

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“…It does not change the shape and trend of the original data flow while filtering out noisy data 19 – 23 The basic principle of least-squares smoothing of signals could be illustrated by Fig. 3 24 …”

Section: Principlementioning

confidence: 99%

Real-time in-situ measurement method of marine sliding bearing wear based on chirped fiber Bragg grating

Liu,

Zhang,

Jing

et al. 2023

Opt. Eng.

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Marine sliding bearings re prone to wear in harsh environments. A real-time in-situ measurement method of sliding bearing wear, based on chirped fiber Bragg grating (CFBG), was proposed. The CFBG wear detection sensor and the corresponding demodulation system were designed and fabricated. The CFBG was sealed to ensure that wear synchronously with the sliding bearing. The relationship between the bandwidth and length of the CFBG was established and adopted to calculate the wear length. Meanwhile, a Savitzky-Golay filter was applied to denoising to improve the accuracy of the demodulation system. Experimental results showed that the sensor could achieve high precision real-time bearing detection and fault warning. With a chirp rate of 10 nm∕cm and a bandwidth resolution of 20 pm, a wear range >8 mm and an accuracy of 0.3 mm could be obtained.

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“…To denoise the sensed signal, wavelet transformation is used. After filtering, prediction of CH 4 accuracy is improved [20,21]. The RADAR signals are generally characterized as non-periodic signals with rapid transients, analysis using conventional Fourier analysis is challenging.…”

Section: A Wavelet Denoising Of If Signals From Radarmentioning

confidence: 99%

Analyzing the Applicability of ML Powered Microwave Sensor for UAV Based CH4 Sensing

Kumar¹,

Mary²,

Esakki³

2023

ijeetc

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In solid waste management, the Methane (CH4) gas generation needs to be monitored and assessed for the environmental protection and prevent the CH4 gas atmospheric dispersion over the dwelling regions near dump yards. Traditional methods using gas sensors measures only gas concentration at different height and never modelled or predict the gas circulation in the atmosphere. Moreover, gas circulation near every dump yard needs to be modelled based on microclimatic conditions for human safety and environmental protection. In this paper an Unmanned Aerial Vehicle (UAV) based, dispersion of CH4 gas is monitored and assessed for the atmospheric circulation of CH4. The CH4 dispersion and atmospheric circulation are monitored through X-Band Bi-Static microwave transceiver sensor and Machine Learning (ML) Algorithm-Multi Linear Regression (MLR). CH4 concentration is assessed through the RADAR’s reflected signals from CH4 gas, whereas RADAR is fixed in the UAV. The RADAR is mounted in UAV to sense concentration of CH4 dispersion at different heights for municipal dump yard located at Thiruninravur, Tamil Nadu, India. A three-days; six-hours of field results, shows the proposed UAV-RADAR based prediction of the CH4, performs better in the range of 250-800 ppm CH4 concentration. The proposed UAV-RADAR system in tracing CH4 dispersion in lower atmosphere is validated through analytical methods and modelled based on microclimatic conditions.

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Performance improvement of on-chip mid-infrared waveguide methane sensor using wavelet denoising and Savitzky-Golay filtering

Cited by 10 publications

References 27 publications

Theoretical and experimental investigation of chalcogenide suspended waveguide gas sensor

Theoretical and experimental investigation of chalcogenide suspended waveguide gas sensor

Real-time in-situ measurement method of marine sliding bearing wear based on chirped fiber Bragg grating

Analyzing the Applicability of ML Powered Microwave Sensor for UAV Based CH4 Sensing

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