Broad range pH sensor based on sol–gel entrapped indicators on fibre optic

Fundamental Study on the Development of Fiber Optic Sensor for Real-time Sensing of CaCO3 Scale Formation in Geothermal Water

“…Apart from its ability to perform multiple chemical sensing, past studies have also shown that the fiber optic evanescent wave sensor can be operated in broad wavelength regions, such as UV, VIS, near infrared (NIR) and mid-IR. [19][20][21][22][23][24][25][26][27][28][29][30][31][32] Smith et al investigated the effects of an inhibitor and a dispersant on the CaCO3 scale formation of the oil field using the standard ATR element. 33 Several groups have reported on the fiber optic method for monitoring CaCO3 precipitation by using an exposed core fiber optic, monochromatic laser light and detector.…”

Nanostructured Materials in Optical Fiber Sensing

“…This, configuration is usually referred as cladding removed (CR) followed by the optical fiber type such as multi-mode fiber (MMF) or plastic optical fiber (POF) and have been largely exploited in literature for the development of optical fiber sensors for ammonia [86,87], humidity [88,89], toluene [90], H 2 S [91,92], aerosol [93] or pH [94][95][96][97][98][99][100][101][102][103][104] detection.…”

“…As regard as the modification of the optical fiber structure it can be mentioned the fabrication of optical fiber sensors by means of hetero-core optical fibers (HCOF) [105][106][107], tapers [22,108,109] or side-polished fibers [94] cresol red, chlorophenol red, bromophenol blue + CNTs [115] Cresol red, chlorophenol red, bromophenol blue [95,96] Ethyl violet [97] Bromophenol blue [98] Bromocresol green & cresol red [99] silica matrix [100] methyl orange sol-gel [101] polymeric film [102] CRMMF/CRPOF [110,111] while the use of special optical fibers for the fabrication of sensors is mainly referred to hollow-core fibers (HCFs) [112,108] and microstructured optical fibers (MOFs) [113,114].…”

Development of an Attenuated Total Reflection Based Fiber-Optic Sensor for Real-time Sensing of Biofilm Formation

“…Apart from its ability to sense multiple chemicals, the fiber-optic evanescent wave sensor can be operated in broad wavelength regions, such as ultraviolet (UV), visible (Vis), near infrared (NIR), and midinfrared. [21][22][23][24][25][26][27][28][29] Several groups have studied the fiber-optic method for monitoring biofilm formation by using an exposed fiber-optic core. 4,10,30 These methods were based on the principle of evanescent field attenuation by biofilm formation.…”