Sensors & Transducers Journal
(ISSN 1726- 5479)
Vol. 125, Issue 2, February 2011, pp.187-193
Fiber Bragg Grating Sensor for Detection of Nitrate Concentration in Water
S. LALASANGI, 1J. F. AKKI, 2K.G. MANOHAR, 3T.
4P. RADHAKRISHNAN, 5SANJAY KHER, 6N. S. MEHLA and 1*U. S. RAIKAR
1Department of Physics, Karnatak University, Dharwad-580 003, Karnataka, India
2Laser &Plasma Technology Division, BARC, Mumbai, India.
Communication Engineering Dept., Indian Institute of Science,
Bengalooru, Karnataka, India
4International School of Photonics, Cochin University of Science & Technology, Cochin, Kerala, India
5RajaRamanna Center for Advanced Technology, Indore, Madhya Pradesh, India
6Central Scientific Instruments Organization, Chandigarh, India
*Tel.: +91-0836-2772550 (09480480079)
Received: 18 January 2011 /Accepted: 15 February 2011 /Published: 28 February 2011
Abstract: The concentrations of chemical species in drinking water are of great interest. We demonstrated etched fiber Bragg grating (FBG) as a concentration sensor for nitrate by analyzing the Bragg wavelength shift with concentration of chemical solution. The FBG is fabricated by phase mask technique on single mode Ge-B co-doped photosensitive fiber. Sensitivity of FBGs to the surrounding solution concentration can be enhanced by reducing diameter of the cladding with 40 % HF solution. The maximum sensitivity achieved is 1.322 ´ 10-3 nm/ppm. The overall shift of Bragg wavelength is of the order of 6.611 ´ 10-2 nm for 10 to 50 ppm concentration.
Keywords: Concentration sensor, Photosensitive fiber, Fiber Bragg grating, Etching, Nitrate
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