Toluene optical fibre sensor based on air microcavity in PDMS

Kacik, Daniel; Martinček, Ivan

doi:10.1016/j.yofte.2017.01.006

Cited by 22 publications

(16 citation statements)

References 14 publications

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“…Fiber optic toluene sensors have limited linearity and selectivity. Optical fiber sensors based on a long period grating for toluene has an operating range of 0–60 ppm [27], and Fabry Perot fiber sensors face the issue of non-linearity [28].…”

Section: Resultsmentioning

confidence: 99%

Development of a Toluene Detector Based on Deep UV Absorption Spectrophotometry Using Glass and Aluminum Capillary Tube Gas Cells with a LED Source

2019

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A simple deep-ultraviolet (UV) absorption spectrophotometer based on ultraviolet light-emitting diode (UV LED) was developed for the detection of air-borne toluene with a good sensitivity. A fiber-coupled deep UV-LED was employed as a light source, and a spectrometer was used as a detector with a gas cell in between. 3D printed opto-fluidics connectors were designed to integrate the gas flow with UV light. Two types of hollow core waveguides (HCW) were tested as gas cells: a glass capillary tube with aluminum-coated inner walls and an aluminum capillary tube. The setup was tested for different toluene concentrations (10–100 ppm), and a linear relationship was observed with sensitivities of 0.20 mA·U/ppm and 0.32 mA·U/ppm for the glass and aluminum HCWs, respectively. The corresponding limits of detection were found to be 8.1 ppm and 12.4 ppm, respectively.

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Section: Resultsmentioning

confidence: 99%

Development of a Toluene Detector Based on Deep UV Absorption Spectrophotometry Using Glass and Aluminum Capillary Tube Gas Cells with a LED Source

2019

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“…An air cavity was also applied to the F-P structure in [ 38 ]. Instead of using HCF directly, a hollow will be created by heating the paraffin, which is coated between the optical fiber and PDMS [ 38 ]. In Figure 7 d, two layers of PDMS can be seen, where the outer PDMS acts to protect the sensor.…”

Section: Sensors Coated With the Pdmsmentioning

confidence: 99%

“… The descriptions of different F-P sensors: ( a ) The F-P sensor consists of SMF and PDMS [ 35 ]; ( b ) F-P sensor consists of SMF, HCF, and PDMS [ 36 ]; ( c ) F-P consists of SMF, HCF filled with PDMS and a PMMA (polymethylmethacrylate) protective layer [ 37 ]; ( d ) Sensor structure consists of SMF, air cavity, and two-PDMS layers [ 38 ]; ( e ) Sensor consists of SMF with the TiO 2 layer and PDMS [ 39 ]. …”

Section: Figurementioning

confidence: 99%

A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Yang

Wang

et al. 2020

Sensors

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In order to improve the performance of fiber sensors and fully tap the potential of optical fiber sensors, various optical materials have been selectively coated on optical fiber sensors under the background of the rapid development of various optical materials. On the basis of retaining the original characteristics of the optical fiber sensors, the coated sensors are endowed with new characteristics, such as high sensitivity, strong structure, and specific recognition. Many materials with a large thermal optical coefficient and thermal expansion coefficients are applied to optical fibers, and the temperature sensitivities are improved several times after coating. At the same time, fiber sensors have more intelligent sensing capabilities when coated with specific recognition materials. The same/different kinds of materials combined with the same/different fiber structures can produce different measurements, which is interesting. This paper summarizes and compares the fiber sensors treated by different coating materials.

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“…water and methanol), the PDMS poses itself as a quite suitable transducing material for selective chemical detection of some VOCs of interest, like hexane and toluene. The use of PDMS as a selective sensing material has been demonstrated in both optical fibre 15,16 and integrated optical platforms 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Silicon photonics waveguide array sensor for selective detection of VOCs at room temperature

Janeiro

Flores

Viegas

2019

Sci Rep

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We report on the fabrication and characterization of a volatile organic compound sensor architecture addressing common drawbacks of photonic integrated sensors such as reusability and specificity. The proposed sensor, built on a silicon-on-insulator platform and based on arrayed waveguide interference, has a chemically selective polydimethylsiloxane polymer cladding, which encapsulates the waveguides and provides an expandable and permeable low refractive index material. This cladding material acts as the chemical transducer element, changing its optical properties when in contact with specific volatile organic compounds, whose presence in the context of environmental and public health protection is important to monitor. The sensor operates at room temperature and its selectivity was confirmed by multiple tests with water, toluene, chlorobenzene, and hexane, through which the sturdiness of the sensor was verified. A maximum spectral shift of about 22.8 nm was measured under testing with chlorobenzene, at a central wavelength of 1566.7 nm. In addition, a sensitivity of 234.8 pm/% was obtained for chlorobenzene mass percent concentrations, with a limit of detection of 0.24%m/m. The thermal sensitivity of the sensor has been found to be 0.9 nm/°C.

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Toluene optical fibre sensor based on air microcavity in PDMS

Cited by 22 publications

References 14 publications

Development of a Toluene Detector Based on Deep UV Absorption Spectrophotometry Using Glass and Aluminum Capillary Tube Gas Cells with a LED Source

Development of a Toluene Detector Based on Deep UV Absorption Spectrophotometry Using Glass and Aluminum Capillary Tube Gas Cells with a LED Source

A Review of Coating Materials Used to Improve the Performance of Optical Fiber Sensors

Silicon photonics waveguide array sensor for selective detection of VOCs at room temperature

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