All-Optical Humidity Sensor Using SnO2 Nanoparticle Drop Coated on Straight Channel Optical Waveguide

Siddiq, Nur Abdillah; Wang, Chong; Pramono, Yono Hadi; Muntini, Melania Suweni; Asnawi, Asnawi; Ahmad, Harith

doi:10.1007/s13320-019-0563-8

Cited by 9 publications

(3 citation statements)

References 42 publications

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“…Nur Abdillah Siddiq et al [ 184 ] exploited SnO 2 on a planar optical waveguide to introduce humidity-dependent attenuation. A silicon wafer with a thermal oxide layer was used as the substrate and undercladding layer for the optical waveguide.…”

Section: Literature and The State-of-the-artmentioning

confidence: 99%

Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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Optical humidity sensors have evolved through decades of research and development, constantly adapting to new demands and challenges. The continuous growth is supported by the emergence of a variety of optical fibers and functional materials, in addition to the adaptation of different sensing mechanisms and optical techniques. This review attempts to cover the majority of optical humidity sensors reported to date, highlight trends in design and performance, and discuss the challenges of different applications.

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Section: Literature and The State-of-the-artmentioning

confidence: 99%

Review of Optical Humidity Sensors

Rao

Zhao

et al. 2021

Sensors

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“…The utilization of functional materials in the fabrication of optical humidity sensors continues to be the prevailing approach in contemporary research. At present, sensors have been developed by employing organic materials containing hydrophilic groups, such as polymers [14] , sugars [15] , and proteins [16] , as well as traditional gas sensitive metallic oxides, such as ZnO [17] , SnO 2 [18] , and SiO 2 [19] . However, these materials exhibit low-refractive-index changes after adsorbing water molecules and require thick films to achieve a sufficient optical signal response.…”

Section: Introductionmentioning

confidence: 99%

Towards a fast and stable tachypnea monitor: a C60-Lys enabled optical fiber sensor for humidity tracking in breath progress

Wang,

Gao,

Wang

et al. 2024

中国光学快报

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The pandemic of respiratory diseases enlightened people that monitoring respiration has promising prospects in averting many fatalities by tracking the development of diseases. However, the response speed of current optical fiber sensors is still insufficient to meet the requirements of high-frequency respiratory detection during respiratory failure. Here, a scheme for a fast and stable tachypnea monitor is proposed utilizing a water-soluble C 60 -Lys ion compound as functional material for the tracking of humidity change in the progression of breath. The polarization of C 60 -Lys can be tuned by the ambient relative humidity change, and an apparent refractive index alteration can be detected due to the small size effect. In our experiments, C 60 -Lys is conformally and uniformly deposited on the surface of a tilted fiber Bragg grating (TFBG) to fabricate an ultra-fast-response, high-sensitivity, and long-term stable optical fiber humidity sensor. A relative humidity (RH) detecting sensitivity of 0.080 dB/% RH and the equilibrium response time and recovery time of 1.85 s and 1.58 s are observed, respectively. Also, a linear relation is detected between the resonance intensity of the TFBG and the environment RH. In a practical breath monitoring experiment, the instantaneous response time and recovery time are measured as 40 ms and 41 ms, respectively, during a 1.5 Hz fast breath process. Furthermore, an excellent time stability and high repeatability are exhibited in experiments conducted over a range of 7 days.

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“…Therefore, some MEQ data processing software applies a minimum number of stations used for processing, in order to obtain a more representative MEQ hypocenter model (Kissling, 1998;Kissling et al, 1995;Nishi, 2005). When the number of stations used does not reach the minimum limit, it will produce a relatively large error value, resulting in less accurate identification of the hypocenter (Bondár et al, 2004;Huang et al, 2018;Küperkoch et al, 2018;Siddiq et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of Geometry and Number of Seismic Stations on Micro-Earthquake (MEQ) Hypocenters in Geothermal Fields

Utama,

Garini,

Hutapea

et al. 2023

jppipa, pendidikan ipa, fisika, biologi, kimia

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Micro-earthquake (MEQ) distribution describes subsurface conditions that can contribute to monitoring the dynamics of geothermal reservoirs. Thus, the distribution of MEQ hypocenter locations with high accuracy becomes extremely important. Experiments were conducted with 3 variations of geometry and number of seismic stations, while Geiger and Coupled Velocity-Hypocenter methods were used to determine the location of MEQ. Experimental results show that in determining the location of the MEQ, the geometry and number of seismic stations played an important role. Increasing the number of stations with relatively long distances can result in less accurate locations of MEQ, error and bias in determining the location of MEQ will be greater when the azimuth gap value is greater. This is shown by the distribution of MEQ that are more spread out in variations 4A and 4B (4 seismic stations) compared to the distribution of MEQ hypocenters using data from 8 seismic stations. The azimuth gap variations of stations 4A and 4B are 283° and 267°, and 8 stations have a value of 222°. The large value of the azimuth gap is due to the distribution of stations only on one side so that there are horizontal angles that are not covered by seismic stations.

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All-Optical Humidity Sensor Using SnO2 Nanoparticle Drop Coated on Straight Channel Optical Waveguide

Cited by 9 publications

References 42 publications

Review of Optical Humidity Sensors

Review of Optical Humidity Sensors

Towards a fast and stable tachypnea monitor: a C60-Lys enabled optical fiber sensor for humidity tracking in breath progress

Effect of Geometry and Number of Seismic Stations on Micro-Earthquake (MEQ) Hypocenters in Geothermal Fields

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