Study on pH Effect in Process of an Entero-gastric Fiber-optic Sensor Design

• Main Authors: Shou Wen-de, Gong Jun, Xia Rong-min, Chen Guo-ping
• Format: Article
• Language: English
• Published: MDPI AG 2002-11-01
• Series: Sensors
• Subjects: Fiber optic sensor; Bilirubin; pH; Entero-gastric reflux
• Online Access: http://www.mdpi.com/1424-8220/2/11/447/

The pH effect on design of a fiber optic sensor newly developed for monitoring entero-gastric reflux is investigated. The research has been carried out by utilizing the sensor to measure characteristic absorption of bilirubin standard solution (used as a calibrator) at different pH values from about 1 to 8. The results show explicitly that the estimation error according to the calibration curves with pH <7 is significantly lower than that at alkaline pH values. Compared with the in vitro experimental data, the optimum pH range for entero-gastric reflux analysis is proposed to be between 5-6. The possible reasons for estimation error of the fiber optic sensor are given in detail.