G. Betta et al., A DIGITAL LIQUID-LEVEL TRANSDUCER BASED ON OPTICAL-FIBER, IEEE transactions on instrumentation and measurement, 45(2), 1996, pp. 551-555
The paper proposes a digital level transducer based on an optical fibe
r from which the cladding was removed in n zones at fixed distances fr
om one another, A theoretical analysis of the propagation in this type
of modified fiber was carried out, highlighting the good potentiality
of the proposed sensor, A 1 m full-scale, 25 mm resolution prototype
was then designed using the results of a numerical simulation, and set
up by optimizing both the sensing element and the conditioning hardwa
re, The static and dynamic characterization tests carried out show hig
h repeatability, good accuracy, and acceptable dynamic performance.