A CO.sub.2 /O.sub.2 or pH/O.sub.2 gas sensor comprising a single optical fiber and a method for making the same. The optical fiber carries light signals at different wavelengths for monitoring either CO.sub.2 concentration or pH level, in combination with O.sub.2 concentration. Attached to the distal...http://www.google.com.au/patents/US5098659?utm_source=gb-gplus-sharePatent US5098659 - Apparatus for continuously monitoring a plurality of chemical analytes through a single optical fiber and method of making
