Abstract
A simple optical fiber structure with a section of no-core fiber for measuring pH is presented. Precursor TEOS and pH-sensitive indicators are used to form the pH coating on the no-core fiber by dip-coating method. The pH induced refractive index changes on the outside coating of no-core fiber will lead to the variations of the optical output power. The results show that a high pH sensitivity of 0.6dBm/pH at 1550nm and a good linear response with a wide pH operation range, from 1 to 13, are obtained. Through monitoring the optical output powers, the responses demonstrate the good stability and repeatability of our proposed structure. At last, the measured data can be obtained with a rapid response time of less than 40s.
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