Publication: Multi-Sensor System For Level Measurements With Optical Fibres
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Publication date
2002-11
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Tutors
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IEEE
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Abstract
A system for measuring liquid level in multiple tanks using optical fibre technology has been developed. The oil field service industry can benefit from this intrinsically safe technology. Plastic optical fibre (POF) sensor heads are excited by a 650 nm laser. Laser diodes are housed in ST connectors to obtain compact and rough prototypes and these connectors are also used in the fibre pigtails. Optical multiplexing is used to increase the measuring safety area. POF splitters and connectors are used to combine all the receiving sensor head fibres in a single one. Frequency division multiplexing is used to address each sensor head. The global system is controlled through a user friendly software application running in a PC connected to the system via an RS-232 port. A scalable prototype with a range greater than 2 meter, good linearity, better than 1.5% FS (full scale), high accuracy and resolution is developed using a unique lens to collimate and focus the light. Measurements are taken to validate the designs. Up to 8 sensor heads can be connected in the present implementation. But a greater number of sensors can be allocated with minor modifications in the electronics.
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Keywords
Computerised instrumentation, Fibre optic sensors, Frequency division multiplexing, Petroleum industry, Measurement by laser beam, Semiconductor laser
Bibliographic citation
IECON´02 (28th Annual Conference of the Industrial Electronics Society), 2002, Vol. 4. p. 2657-26