Page 54 - libroBrevetti

Department of Engineering, ICT and Technologies for Energy and Transport Patent Title 0.05 Misura Seno a 12.3 Hz Method for meĂƐƵrŝŶŐ dyŶĂmiĐ strĂŝŶ ĂůŽŶŐ ĂŶ 0.04 ŽƉƟĐĂů ĮďĞƌ ďĂƐed oŶ the sƟŵƵůĂƚĞĚ BrillouŝŶ 0.03 sĐĂƩeƌŝŶŐ ďetweeŶ two ŽƉƟĐĂl pulses, ĂŶd relevĂŶt 0.02 Signale [u.a.] ĂƉƉĂrĂƚƵƐ͘ 0.01 0 Ref. CNR 10047 -0.01 -0.02 Assignee(s): CNR -0.03 CNR InƐƟƚute: IREA -0.04 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Main Inventor: Romeo Bernini Tempo [s] Countries: IT Priority date: 06/11/2009 Abstract The preseŶt ŝŶveŶƟŽŶ refers to Ă teĐŚŶŝƋƵe for meĂƐƵƌŝŶŐ the dyŶĂŵŝĐ sƚƌĂŝŶ ĂůŽŶŐ ĂŶ opƟĐĂl Įďer, ďĂƐed ŽŶ the sƟmƵůĂƚed BrillouiŶ shiŌ sĐĂƩerŝŶŐ ďetweeŶ two ŽƉƟĐĂů pulses. The proposed ĂƉƉrŽĂĐh is ďĂƐed oŶ the sƟŵƵůĂƚĞĚ BrillŽƵŝŶ shiŌ sĐĂƩĞƌŝŶŐ - ĂvĂŝlĂďle ĂůƐŽ ŝŶ stĂŶĚĂƌĚ teleĐŽmmƵŶŝĐĂƟŽŶ ĮďĞƌƐ - ĂŶĚ permits to performs disƚƌŝďƵƚĞd vŝďƌĂƟŽŶ ŵĞĂƐƵƌĞŵĞŶƚƐ͘ The presĞŶt ŝŶveŶƟŽŶ is ƌĞůĂted ĂůƐŽ to ĂŶ experimeŶƚĂů ĂƉƉĂƌĂƚƵƐ ǁŚŝĐh ŝŵƉůĞŵĞŶƚƐ the ƚĞĐŚŶique ĂŶd whŝĐŚ ŚĂs ďeeŶ used iŶ order to ĐĂrried out some experimeŶƚĂů tests up to Ă frequeŶĐy of 100Hz ĂŶd with Ă spĂƟĂů resoluƟoŶ of 3m ĂůŽŶŐ Ă 30m ůŽŶŐ Įďer. Background NŽǁĂdĂys, distrŝďƵƚed Įďer ŽƉƟĐ seŶsors ďĂƐed oŶ sƟmƵůĂƚed BrŝůůŽƵŝŶ sĐĂƩerŝŶŐ Ăre widely used for distrŝďƵƚed strĂŝŶ ŵŽŶŝƚŽrŝŶŐ͘ However, the developed seŶsors require meĂƐƵremeŶt Ɵŵe ƚŚĂt rĂŶŐe from severĂů sĞĐoŶds to mŝŶutes, so they Đould ďe used ŽŶůy foƌ Ă stĂƟĐ strĂiŶ moŶitorŝŶŐ. Technology The method uses two ŽƉƟĐĂl pulses ĐŽƵŶƚer-prŽƉĂŐĂƟŶŐ iŶ ĂŶ opƟĐĂl Įďer with Ă delĂy T. The reůĂƟve delĂLJ ďetweeŶ the two pulses is set ŝŶ order to ŽďtĂŝŶ Ă spĂƟĂl overlĂp of the two opƟĐĂl pulses ŝŶ ĐŽrresƉŽŶĚeŶĐe of the Įďer seĐƟŽŶ dyŶĂŵŝĐĂůly strĂŝŶed. IŶ this ǁĂy, ĂŶLJ viďrĂƟoŶ-iŶduĐed ŵŽĚƵůĂƟŽŶ of the ůŽĐĂů BrillouŝŶ frequeŶĐy shiŌ, due to Ă dyŶĂŵŝĐ strĂŝŶ, will ďe eĂƐŝůLJ meĂƐƵƌed Ăs ĂŶ ŝŶƚeŶsity vĂƌŝĂƟŽŶ of the Stokes pulse peĂk ŝŶƚeŶsity, ĂƐ it ĞŵĞƌŐĞƐ from the seŶsŝŶŐ Įďer. Advantages and ApplicaƟons The ŵĂŝŶ ĂdvĂŶtĂŐĞ of the proposed teĐŚŶŝƋƵes is ƚŚĂƚ, usŝŶŐ Ă sŝŶŐle ŽƉƟĐĂů Įďer, it’s possiďle to ŵŽŶŝƚŽƌŝŶŐ the sƚĂƟĐ sƚƌĂŝŶ ĂůŽŶŐ the ĮďĞƌ ĂŶĚ ŵĞĂƐƵre the dyŶĂmiĐ strĂiŶ iŶ speĐiĮĐ ĮďĞƌ ƐĞĐƟŽŶ. This seĐƟŽŶ - ĂůŽŶŐ the Įďer - ĐĂŶ ďe ĐhĂŶŐĞd ďy simply vĂryŝŶŐ the relĂƟve delĂy ďetweeŶ the two opƟĐĂl pulses. The ŝŶveŶƟŽŶ ĐĂŶ ďe used ŝŶ ůĂƌŐĞ Đivil ŝŶĨrĂƐƚruĐƚƵre ŵŽŶŝƚŽrŝŶŐ Ăs ďridŐĞs, hiŐhǁĂys, rĂŝůwĂys ĂŶd pipeůŝŶes. Development stage The proposed ĂpproĂĐh hĂs ďeeŶ ǀĂlidĂted ďy some experimeŶƚĂl lĂďŽƌĂƚory tests up to Ă frequeŶĐLJ of 100Hz ĂŶd ǁŝƚŚ Ă spĂƟĂů resŽůƵƟŽŶ of 3m ĂůŽŶŐ Ă 30m ůŽŶŐ Įďer. 45