Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-09-07
1991-12-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022717, 25022719, H01J 516
Patent
active
050721135
ABSTRACT:
In a polarimetric fibre-optic sensor using a polarization-maintaining optical fibre with two light propagation modes, a reference light signal is fed to propagate along the optical fibre in accordance with one propagation mode, a series of measurement light signals being induced by a series of optical fibre deformation elements, to propagate along the optical fibre in accordance with the other propagation mode, each being unbalanced in time with respect to the reference light signal by an amount which is different from that of the other measurement light signals; by using particular interferometric techniques, compensating the unbalances and analyzing the signals resulting from the interference between the measurement light signals and the reference light signal it is possible to determine and locate a physical phenomenon which disturbs the optical fibre.
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patent: 4536088 (1985-08-01), Rashleigh et al.
patent: 4725143 (1988-02-01), Jones et al.
patent: 4896942 (1990-01-01), Onstott et al.
patent: 4904863 (1990-02-01), McDearmon
patent: 4906068 (1990-03-01), Olson et al.
patent: 4970385 (1990-11-01), Tatsuno et al.
Gusmeroli Valeria
Martinelli Mario
Vavassori Paolo
Centro Informazioni Studi ed Esperienze S.p.A.
Le Que T.
Nelms David C.
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