A FIBEROPTIC BROAD-RANGE PH SENSOR SYSTEM FOR GASTRIC MEASUREMENTS
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abstract
The construction and performance of a fiber-optic broad-range pH sensor system are described. The general construction of the sensor is similar to the original fiber-optic pH sensor, but two dyes with three pK values have been immobilized to provide resonse over the pH range of 0.5-7 with a precision better than 0.1 pH unit. The range extends to pH9 with less precision. The primary objective of the design is for gastric measurements. The system is based on absorbance dyes bound to polyacrylamide gel containing light-scattering particles. The sensor is constructed on a single 0.25-mm diameter plastic optical fiber. The optical system consists of a tungsten lamp, fiber-optic splitter and CCD/grating detector connected to a computer for spectral analysis, using two wavelength regions. The computer displays the pH graphically over 24 h. The system shows stability within 0.2 pH unit over 24 h, and has been tested with gastric samples in a dog. 1995.