Fiber optic salinity sensor using beam-through technique
a Department
of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603
Kuala Lumpur, Malaysia
b Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia c
b Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia c
Abstract
A fiber
optic displacement sensor is proposed to sense salinity based on different
concentration of sodium chloride (NaCl) in de-ionized water using the
beam-through technique. The performance of a 594 nm and 633 nm He-Ne laser as
the light source are compared. For a concentration change of sodium chloride
from 0 to 12% in de-ionized water, the output voltage increase linearly and the
sensitivity is dependent on the displacement position of the receiving fiber
from the quartz cell containing the sodium chloride solutions. Measurements
taken at higher displacement positions contribute to lower sensitivity with the
highest sensitivity of 0.0237 mV/% and 0.0412 mV/% occurring at the 0 mm
displacement position for the 594 nm and 633 nm He-Ne lasers, respectively.
Furthermore, a better limit of detection of 1.44% is achieved when the 633 nm
He-Ne laser is used compared to the 1.28% limit of detection achieved by using
the 594 nm He-Ne laser. The main novelty of this sensor is that it is
contactless and non-destructive which are attractive features for applications
involving delicate and hazardous processes. © 2012 Elsevier GmbH.
Full Text :
Tidak ada komentar:
Posting Komentar