Patent ID: 7982863

Claim:
A laser anemometry probe for optical homodyne detection of frequency offset by Doppler effect, comprising: a laser source (SL) supplying a linearly polarized reference wave, a first separator (SEP 1 ) of the signal originating from the laser source (SL) into a signal transmitted to a first amplifier (AMP 1 ) and a signal transmitted to a coupler with maintained polarization (CPLMP), a first device (DERF 1 ) for transmitting/receiving beams in a first direction, a first backscattered beam separator (SFRD 1 ) arranged between the first amplifier (AMP 1 ) and the first transmitter/receiver device (DERF 1 ) and transmitting the signal originating from the first amplifier (AMP 1 ) to the first transmitter/receiver device (DERF 1 ), a polarization consistency element (EMCP) arranged upstream of the coupler with maintained polarization (CPLMP), and a balanced detector (DETEQ) arranged downstream of the coupler with maintained polarization (CPLMP), and further comprising a second separator (SEP 2 ) arranged between the laser source (SL) and the first separator (SEP 1 ) to separate the signal obtained from the laser source (SL) into two signals addressed respectively to the first separator (SEP 1 ) and a third separator (SEP 3 ) for separating the signal originating from the laser source (SL) into a signal transmitted to a second amplifier (AMP 2 ) and a signal transmitted to the coupler with maintained polarization (CPLMP), a second device (DERF 2 ) for transmitting/receiving beams in a second direction distinct from the first direction, a second backscattered beam separator (SFRD 2 ) arranged between the second amplifier (AMP 2 ) and the second transmitter/receiver device (DERF 2 ) and transmitting the signal originating from the second amplifier (AMP 2 ) to the second transmitter/receiver device (DERF 2 ), and a first and a second return pathways (VR 1 , VR 2 ) for respectively transmitting the signal backscattered from the first backscattered beam separator (SFRD 1 ) at the input of the first separator (SEP 1 ), and the signal backscattered from the second backscattered beam separator (SFRD 2 ) at the input of the third separator (SEP 3 ).