Intensity modulated silver coated glass optical fiber refractive index sensor

Samavati, Zahra; Samavati, Alireza; Ismail, Ahmad Fauzi; Rahman, Mukhlis A.; Othman, Mohd Hilmi

doi:10.3788/col201816.090602

Cited by 8 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 30 ] However, oxygen vacancies play an important role in the enhancement of conductivity of the sensing surface and it is directly proportional to each other. [ 31 ] The Fermi energy band level lies in between the lower (valence) band and upper band and its distance is closer to the upper band which is shown in the electronic band diagram ( Figure ). Indeed, during the interaction of sensing probes with an amine group, the Fermi level shifting takes place (Figure 5) with the transformation of lone pair of electrons (:→) from the N 2 atom to the sensing surface.…”

Section: Methodsmentioning

confidence: 96%

Preparation of Bi‐Doped ZnO Thin Film over Optical Fiber and Their Application as Detection of Ethylenediamine in an Aqueous Medium Based on the Evanescent Field Technique

Singh

Samanta

Dhar

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

Synthesis of pure ZnO and bismuth-doped ZnO (xBi/Zn) (x ¼ 6 wt%) thin-film based optical fiber sensor and their material/optical characterization such as Brunauer-Emmett-Teller (BET) analysis, field-emission scanning electron microscopy (FESEM), and energy dispersive X-ray (EDX) analysis is reported. As-prepared material such as xBi/Zn is deposited over the optical fiber, and optimum clad thickness in the range of 2-5 μm is achieved through MATLAB simulation to enhance the feasible evanescent field interaction with gas analyte molecules. The modal field analysis of the sensing probe before and after the deposition of xBi/Zn is also studied using COMSOL Multiphysics Modeling software and find strong light propagation into the LP 04 mode. The sensing probes are tested in different chemicals and ethylenediamine (EDA) is found to be the most suitable candidate in the concentration range of 100-800 ppm. The response time of the ZnO and xBi/Zn-doped thin-film-based optical sensor is found to be 20 and 15 s, whereas the corresponding sensitivity (%) is 1.078 and 3.483, respectively. The repeatability test of the sensor is also carried out which reveals good response stability.

show abstract

Section: Methodsmentioning

confidence: 96%

Preparation of Bi‐Doped ZnO Thin Film over Optical Fiber and Their Application as Detection of Ethylenediamine in an Aqueous Medium Based on the Evanescent Field Technique

Singh

Samanta

Dhar

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…The basic operating principle of the fiber optic sensor is that the light signal travelling through an optical fiber changes when it is subjected to chemical or physical stimulus [13]. Such mechanism allows the fiber optic sensor to find applications in detecting properties such as temperature [14], [15], liquid level [16], [17], refractive index [18]- [20], uric acid concentration [21], [22] and ammonia concentration [2], [6]- [11]. For ammonia detection in water, many methods have engineered the fiber such that a part of the cladding of the fiber sensor is removed through chemical etching, tapering or a combination of etching and tapering.…”

Section: Introductionmentioning

confidence: 99%

Optimization of light source wavelength for ammonia detection in water

Rashid

Cholan²,

Tay³

et al. 2022

TELKOMNIKA

View full text Add to dashboard Cite

Optimization of light source wavelength for ammonia detection in surface water is presented in this work. For the ammonia detection, the surface water sample is mixed with sodium chloride and nessler reagent, whereas the sensor head consists of unclad plastic optical fiber. The unclad region has a length of 1 cm and the cladding is removed by immersing it in acetone solution. Experimental results indicate that the output light intensity of the sensor has linear relationship with the ammonia concentration. At the wavelength of 510 nm, the output light increases linearly as the ammonia concentration varies from 0.07 mg/L to 8.97 mg/L. At the same wavelength, the proposed sensor achieves the sensitivity of 0.0139 (mg/L) -1 , accuracy of 99.59% and resolution of 0.72 µg/L. The analysis of light source wavelength reveals that a wavelength range from 450 nm to 580 nm produces the optimized performances. Within this wavelength range, the proposed sensor achieves sensitivity of higher than 0.01 (mg/L) -1 , accuracy of higher than 99% and resolution of less than 1 µg/L.

show abstract

“…Optical fiber sensors are well known for their advantages such as high immunity to electromagnetic interferences, high durability when exposed to harsh environment and high sensitivities. For these reasons, they have found many applications that involve the monitoring of refractive index [1], humidity [2], vibration [3], temperature [4] and other various parameters.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg grating based linear cavity fibre laser temperature sensor with enhanced optical signal-to-noise ratio

et al. 2019

View full text Add to dashboard Cite

An optical temperature sensor based on linear cavity erbium-doped fiber laser is proposed in this work. A fiber Bragg grating is utilized in the laser cavity as the sensor head for temperature detection. Experimental results suggest that the laser wavelength has linear relationship with temperature. As the temperature increases from 25 °C to 55 °C, the laser wavelength shifts linearly from 1550.168 nm to 1550.524 nm with the recorded sensitivity of 11.7 pm °C−1 . The laser is also found to be stable with fluctuation of less than 0.42 dB and it has 3 dB linewidth of 0.024 nm. Moreover, the laser has high optical signal-to-noise ratio (OSNR) of 55 dB and this arises from the use of linear cavity in this design. Resulting from the signal amplification that happens twice in the linear cavity for a round trip, the laser gets high power and this enhances the laser OSNR. The high OSNR of the laser is beneficial to improve the sensor detection limit.

show abstract

Intensity modulated silver coated glass optical fiber refractive index sensor

Cited by 8 publications

References 33 publications

Preparation of Bi‐Doped ZnO Thin Film over Optical Fiber and Their Application as Detection of Ethylenediamine in an Aqueous Medium Based on the Evanescent Field Technique

Preparation of Bi‐Doped ZnO Thin Film over Optical Fiber and Their Application as Detection of Ethylenediamine in an Aqueous Medium Based on the Evanescent Field Technique

Optimization of light source wavelength for ammonia detection in water

Fiber Bragg grating based linear cavity fibre laser temperature sensor with enhanced optical signal-to-noise ratio

Contact Info

Product

Resources

About