TITLE:
An Optical Fiber Sensor for Simultaneous Measurement of pO2 and pH
AUTHORS:
Baorong Fu, Xianwen Zhang, Huimin Cao, Zhushanying Zhang
KEYWORDS:
Optical Fiber Sensor, Oxygen, pH, Fluorescence
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.13 No.4,
April
28,
2023
ABSTRACT: Whether in the monitoring of critically ill patients such as shock,
respiratory failure, brain injury, or in major anesthesia surgeries, it is
necessary to evaluate the patient’s pO2 and pH. An optical fiber sensor
presented is capable of monitoring the
presence of oxygen partial pressure (pO2)
and pH in the real-time. The sensor is based on fluorescence
sensing of polymer immobilized in the oxygen/pH-sensitive membranes and
covalently attached to the optical fiber probe. The design of this sensor uses LED as light source, which is an excitation light source,
inducing specific wavelengths of fluorescence on the oxygen/pH-sensitive membrane. The intensity and lifetime
of fluorescence are related to the pO2 and pH. So the pO2 and pH can be measured by the relationship between the pO2/pH values
and the intensity and lifetime of fluorescence. The signal conditioning system
based on DSP and STM32 was used to store and process data, and display test
values. The response of the sensor for pO2 and pH monitoring with
nitrogen (N2)
as a balancing gas in the laboratory was performed. Finally, the oxygen/pH
sensing scheme presented in this work is intended for using in biological,
medical and environmental applications.