Abstract
The response time of an optical-fibre pH sensor with a design discussed in this paper depends upon the matrix quantity and particle size, the indicator solution concentration, direction and magnitude of the pH change, shape of the sensor tip, temperature of the analyte solution and transition interval of the indicator relative to the pH of the solution. This paper reports studies of the response time of optical-fibre pH sensors based on the use of the indicators bromophenol blue and bromothymol blue measured using diffuse reflectance spectrometry.
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