[OPTICAL REVIEW Vol. 5, No. 1 (1998) 13-15]

A New Plastic Optical Fiber Sensor for Oxygen Based on Fluorescence Enhancement

Gargi VISHNOI, Masayuki MORISAWA and Shinzo MUTO

Department of Electrical Engineering and Computer Science, Faculty of Engineering, Yamanashi University, 4-3-11, Takeda, Kofu 400 Japan

(Received November 6, 1997; Accepted November 18, 1997)

A new method for the detection of low oxygen concentration is proposed here. The system is based on the principle of enhancement of fluorescence yield of tetraphenylporphine (TPP) dye at l=656 nm when excited by He-Cd laser at l=441 nm in the presence of oxygen. The sensor head was fabricated by cladding the ARTON fiber core with the poly-4-methyl-1-pentene polymer matrix doped with TPP. The experimental results obtained indicate a good enhancement in the fluorescence when the sensor head is exposed to oxygen. The response was found to be linear and stable in the range of (100 ppm-1%) with the resolution of 0.01%. The sensor response was characterized by studying its response for change in temperature and is discussed below.

Key words : oxygen sensor, fluorescence enhancement, plastic optical fiber ARTON fiber, PMP (poly-4-methyl-1-pentene), TPP (tetraphenylporphine).