Patent ID: 11957435
Assignee: UNIV PARIS XIII PARIS-NORD VILLETANEUSE
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 9:
10. An acousto-optic imaging system for imaging a region of observation of a medium, the acousto-optic imaging system comprising:
an array of ultrasonic transducers regularly spatially distributed,
a light-emitting device allowing a sprectrum of emitted light to be controlled,
a light detector,
a control device configured for acquiring, via the light detector, a plurality of measurement signals Smj(t) associated with spatially-modulated unfocused acoustic waves respectively propagating in different directions of propagation m,
the control device being configured for:
causing said spatially-modulated unfocused acoustic waves to be emitted in the region of observation successively J times, with respectively J periodic spatial amplitude modulations j having an identical spatial period in at least one direction of spatial periodicity, and corresponding to a given number P of ultrasonic transducers, the periodic spatial amplitude modulations j being mutually spatially phase-shifted,
causing at least one incident light wave to be emitted by the light-emitting device in the region of observation, at the same time as each of said spatially-modulated unfocused acoustic waves, in order to generate spatially-modulated tagged light waves, each spatially-modulated tagged light wave comprising at least one acousto-optic component shifted in frequency by at least one of said spatially-modulated unfocused acoustic waves,
acquiring by the light detector, for each spatially-modulated tagged light wave, a measurement signal Smj(t) corresponding to the periodic spatial amplitude modulation j and to the unfocused acoustic wave propagating in the direction m, thus acquiring a plurality of measurement signals Smj(t),
for each direction of propagation m, carrying out a spatial demodulation by combining the plurality of measurement signals Smj(t) corresponding to the J periodic spatial amplitude modulations for the considered direction of propagation m, in order to obtain a demodulated signal Sm(t) specific to the considered direction of propagation m, thus obtaining a plurality of demodulated signals Sm(t),
determining an image of at least a part of the region of observation using said plurality of demodulated signals Sm(t).