Biaxial Laser Anemometry Probe
AssigneeThales
InventorsPhilippe Rodeau, Jean-Pierre Schlotterbeck
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Abstract
The subject of the present invention is a laser anemometry probe for optical homodyne detection of frequency offset by Doppler effect, comprising two devices (DERF1, DERF2) for transmitting/receiving beams in two different directions, avoiding duplicating a plurality of elements of a mono-axial laser anemometry probe.
Claims9
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 (SEP1) of the signal originating from the laser source (SL) into a signal transmitted to a first amplifier (AMP1) and a signal transmitted to a coupler with maintained polarization (CPLMP),
- a first device (DERF1) for transmitting/receiving beams in a first direction, a first backscattered beam separator (SFRD1) arranged between the first amplifier (AMP1) and the first transmitter/receiver device (DERF1) and transmitting the signal originating from the first amplifier (AMP1) to the first transmitter/receiver device (DERF1),
- 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 (SEP2) arranged between the laser source (SL) and the first separator (SEP1) to separate the signal obtained from the laser source (SL) into two signals addressed respectively to the first separator (SEP1) and a third separator (SEP3) for separating the signal originating from the laser source (SL) into a signal transmitted to a second amplifier (AMP2) and a signal transmitted to the coupler with maintained polarization (CPLMP), a second device (DERF2) for transmitting/receiving beams in a second direction distinct from the first direction, a second backscattered beam separator (SFRD2) arranged between the second amplifier (AMP2) and the second transmitter/receiver device (DERF2) and transmitting the signal originating from the second amplifier (AMP2) to the second transmitter/receiver device (DERF2), and a first and a second return pathways (VR1, VR2) for respectively transmitting the signal backscattered from the first backscattered beam separator (SFRD1) at the input of the first separator (SEP1), and the signal backscattered from the second backscattered beam separator (SFRD2) at the input of the third separator (SEP3).
The laser anemometry probe according to claim, in which said polarization consistency element (EMCP) is arranged between the first separator (SEP1) and the coupler with maintained polarization (CPLMP), or between the third separator (SEP3) and the coupler with maintained polarization (CPLMP).
Dependencies are inferred from the claim text.