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Its foundation is the pH regulation of dissolved carbon dioxide in a fluorescent dye sensor layer. The tiny size of the sensor is maintained by utilising a previously discovered technique in which the sensing chemical is directly bonded to the glass fiber tip.
Gas sensors that are made specifically to measure carbon dioxide concentrations in the atmosphere are used to measure carbon dioxide. A CO2 detector is frequently used in horticulture in controlled environments, landfill monitoring, process control, and indoor air quality monitoring.
By altering an optical fiber so that the quantity to be measured alters the intensity, phase, polarisation, wavelength, or transit time of light in the fiber, optical fibers can be used as sensors to monitor strain, temperature, pressure, and other quantities.
The idea behind optical oxygen sensors is the oxygen-induced quenching of fluorescence. They rely on the usage of a luminescent substance that responds to light, a light source, and a light detector. The Clark electrode is being replaced by oxygen sensors based on luminescence in several sectors.
The global Optical fiber carbon dioxide (CO2) sensor market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
An optical fiber-based long period grating (LPG) carbon dioxide (CO2)sensor is given that has been functionally coated with HKUST-1, a substance from the metal organic framework family.
The practicality of the deposition approach (time and cost efficiency) and the carbon dioxide sensitivity of the HKUST-1 thin film are compared between the in-situ crystallisation and layer by layer (LbL) procedures.
The sensing method relies on the detection of the modification in the coating’s refractive index (RI), which is brought on by the entry of CO2 molecules into the HKUST-1 pores. SEM was used to analyse and characterise the HKUST-1 film (SEM).
Ellipsometry was used to calculate the thickness and refractive index (RI) of the 10, 20, and 40 layer thick films. The X-ray diffraction pattern was used to analyse the films’ crystallinity (XRD).
When exposed to CO2 in the range of 500 ppm to 40,000 ppm, an LPG modified with 10, 20, and 40 layers of HKUST-1 films using the LbL method demonstrated good sensitivity, however no reaction to CO2 was found for the sensor coated using the in-situ crystallisation process. The film with 40 layers demonstrated the highest CO2 sensitivity, with a 401 ppm detection limit.
