An air-pressure and acoustic fiber sensor based on graphene-oxide Fabry-Perot interferometer

Chen, Yu‐Fang; Wan, Hongdan; Lu, Yao; Wang, Ziji; Fan, Weiwen; Zhang, Zuxing; Hu, Fangren

doi:10.1016/j.yofte.2021.102754

Cited by 18 publications

(9 citation statements)

References 29 publications

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“…It is clear that the as-fabricated F–P sensor with the EBC is advantageously capable of improving the sensitivity. More prominently, the S M of the F–P sensor with the EBC is ∼100 times higher than that of other graphene-based F–P sensors. , The achieved S M of 187.32 nm/Pa@16 kHz is even superior to the maximum sensitivity (160 nm/Pa@4 kHz) of F–P sensors having larger diaphragms with over 1 mm diameters, ,,, therefore strongly highlighting the conspicuous function of the EBC.…”

Section: Experiments and Resultsmentioning

confidence: 86%

“…More prominently, the S M of the F−P sensor with the EBC is ∼100 times higher than that of other graphene-based F−P sensors. 20,21 The achieved S M of 187.32 nm/Pa@16 kHz is even superior to the maximum sensitivity (160 nm/Pa@4 kHz) of F−P sensors having larger diaphragms with over 1 mm diameters, 8,13,25,30 therefore strongly highlighting the conspicuous function of the EBC. The SNR, an acoustic sensor's performance related to sensitivity, determines its usefulness in a noisy environment and difficulty in signal processing.…”

Section: Experimental Results Analysismentioning

confidence: 92%

“…According to the calculated results, the average value of the MDP is 94.35 μPa/Hz 1/2 . Note that the MDP is 29.33 μPa/Hz 1/2 @2 kHz, which is better than the Comparison of S M between typical F−P acoustic sensors utilizing diaphragms of different materials (orange circles) and a capacitive acoustic sensor (purple triangle) (data sources: small silver film, 8 large silver film, 13 MoS 2 film, 12 small graphene film, 21 large graphene film, 20 silica film, 14 graphene oxide film, 30 PET film, 25 previous results (57.45−141.59 μPa/Hz 1/2 ) of conventional F−P acoustic sensors. 7,13,16,20,25 This high SNR and outstanding MDP indicate that the F−P sensor with the EBC has the ability to detect a weak voice more easily compared with those F−P acoustic sensors previously reported.…”

Section: Experimental Results Analysismentioning

confidence: 96%

“…(e) The amplitude-frequency response and SNR among typical F–P sensors with the EBC. (f) Comparison of the SNR in F–P sensors employing diaphragms of different materials (data sources from left to right: graphene film in this work, graphene oxide film, graphene film, silver film, graphene film, and graphene film).…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…(e) The amplitude-frequency response and SNR among typical F−P sensors with the EBC. (f) Comparison of the SNR in F−P sensors employing diaphragms of different materials (data sources from left to right: graphene film in this work, graphene oxide film,30 graphene film,20 silver film, 8 graphene film,32 and graphene film21 ).T h i s c o n t e n t i s o n l y l i c e n s e d f o r c o n s u m p t i o n b y A u t h o r i z e d U s e r s a f f i l i a t e d w i t h s c i t e .…”

mentioning

confidence: 99%

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Ultrasensitive Acoustic Detection Using an Enlarged Fabry–Perot Cavity with a Graphene Diaphragm

Liu,

Li,

et al. 2023

ACS Appl. Mater. Interfaces

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For exerting high sensitivity of ultrathin graphene to detection deformation, an enlarged backing air cavity (EBC) structure is developed to further enhance the mechanical sensitivity (S M ) of a graphene-based Fabry−Perot (F−P) acoustic sensor. COMSOL acoustic field simulation on the air cavity size-dependent S M confirms the optimal length and radius of the EBC of 0.2 and 1.5 mm, respectively, with the maximum simulation S M of 26.16 nm/Pa@1 kHz. Acoustic experiments further demonstrate that the frequency response of the fabricated graphene-based F−P acoustic sensor after the use of the EBC is enhanced by 5.73−79.33 times in the range of 0.5−18 kHz, compared with the conventional one without the EBC. Especially the maximum S M is up to 187.32 nm/ Pa@16 kHz, which is at least 17% higher than the S M values ranging from 1.1 to 160 nm/Pa in previously reported F−P acoustic sensors using various diaphragm materials. More acoustic characteristics are examined to highlight various merits of the EBC structure, including a signal-to-noise ratio (SNR) of 60−75 dB@0.5−18 kHz, a time stability of less than ±1.3% for 90 min, a detection resolution of 0.01 Hz, and a high-fidelity speech detection with a cross-correlation coefficient of greater than 0.9, thereby revealing its high-performance weak acoustic sensing and speech recognition applications.

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