Tapered Fiber Sensor for Citric Acid Detection

For many industries, the ability to distinguish between different solution concentrations is crucial. Modern sensors necessitate a labour-intensive and difficult approach. These problems are addressed by tapered fibre optic sensors. This fibre can be used as citric acid sensors because to its effectiveness, high sensitivity, stability, compact size, low cost, and tolerance to electromagnetic interference. The use of a tapered single-mode fibre sensor to monitor citric acid levels in deionized water is presented in this research. With increasing citric acid content, the wavelength shift of light transmitted from the fibre sensor is tracked and studied. Using a heat-pulling technique, the tapered fiber's waist diameter is reduced to 6 m. As the solution concentration increased from 400 ppm to 700 ppm, the wavelength shifted to the right, from 1524.86 nm to 1530 nm, with a sensitivity of 0.0169 nm/ppm and a linearity of 93%. This sensor has the benefits of being simple to use, inexpensive, and responsive.