Abstract: An acousto-optic imaging method in which light waves and unfocused acoustic waves having various directions of propagation m are emitted in a medium, by spatially modulating the amplitude of the ultrasonic transducers of an array of transducers according to several periodic spatial amplitude modulations j, and the resulting optical signal Smj(t) is captured. For each direction of propagation m, the signals Smj(t) are spatially demodulated in order to determine a signal Sm(t) used to reconstruct the image of the medium.

Abstract: An acousto-optic imaging method in which light waves and unfocused acoustic waves having various directions of propagation m are emitted in a medium, by spatially modulating the amplitude of the ultrasonic transducers of an array of transducers according to several periodic spatial amplitude modulations j, and the resulting optical signal Smj(t) is captured. For each direction of propagation m, the signals Smj(t) are spatially demodulated in order to determine a signal Sm(t) used to reconstruct the image of the medium.

Abstract: This analog electronic circuit (2) for processing a light signal (4), of the type comprising: a photodetector (6) adapted for producing an electric signal (8) from the light signal (4); a multiplier (12) adapted for multiplying the electric signal (8) with a reference signal (14) for obtaining a multiplied signal (16); and an integrator (18) adapted for integrating the multiplied signal (16) over at least one time interval, in order to obtain one integrated signal, is characterized in that it further comprises: an analog memory (24) adapted for storing the integrated signal in memory; and a computing unit adapted for estimating a time correlation of the light signal (4) from the integrated signal stored in memory.

Abstract: This analog electronic circuit (2) for processing a light signal (4), of the type comprising: a photodetector (6) adapted for producing an electric signal (8) from the light signal (4); a multiplier (12) adapted for multiplying the electric signal (8) with a reference signal (14) for obtaining a multiplied signal (16); and an integrator (18) adapted for integrating the multiplied signal (16) over at least one time interval, in order to obtain one integrated signal, is characterized in that it further comprises: an analog memory (24) adapted for storing the integrated signal in memory; and a computing unit adapted for estimating a time correlation of the light signal (4) from the integrated signal stored in memory.

Abstract: A method for analyzing a diffusing sample comprises steps of: a) illuminating the sample with temporally coherent and wavelength-modulated incident light beam; b) producing a succession of interference signals with the diffuse light; c) combining each interference signal with a reference signal (Ref(t,?0)) generating a time port; d) extracting the continuous component of each signal characteristic of the predetermined delay (?0) derived form c); applying a nonlinear function on each of the continuous components of the signals characterizing the predetermined delay (?0); and f) averaging each of the images, with the non-linear function, of the continuous components of the signals characterizing the predetermined delay (?0). The invention is useful for observing organs of the human body.

Abstract: The invention concerns a method for analysing a diffusing sample comprising steps which consist in: a) illuminating the sample with a temporally coherent and wavelength-modulated incident light beam; b) producing a succession of interference signals with the diffuse light; c) combining each interference signal with a reference signal (Ref(t,&tgr;0)) generating a time port; d) extracting the continuous component of each signal characteristic of the predetermined delay (&tgr;0)) derived form c); applying a non-linear function on each of the continuous components of the signals characterising the predetermined delay (&tgr;0); and f) averaging each of the images, with said non-linear function, of the continuous components of the signals characterising the predetermined delay (&tgr;0). The invention is useful for observing organs of the human body.