Patent ID: 8451435
Filing Date: 2013-05-28
Classification: G01P,G01S

Abstract:
1. An optical anemometric probe comprising: at least one laser source emitting a linearly polarized primary light beam; an optical block; and an optical measurement pathway, wherein the optical block comprises: splitting means for separating the said primary beam into two secondary beams; an optical reference pathway; and an optical emission pathway, the first secondary beam passing through the optical reference pathway, the second secondary beam passing through the optical emission pathway, the optical emission pathway comprising at least one optical circulator and a first optical emission/reception head illuminating a first measurement zone, and wherein the optical block comprises optical means of rotation of the polarization arranged at the output of the laser source and before the splitting means ( said optical means of rotation of the polarization making it possible to rotate the plane of polarization of the primary light beam by a known angle, the optical block further comprises a second optical emission/reception head illuminating a second measurement zone, the optical circulator comprises four ports, a first input port through which the second secondary beam enters, a second and a third input/ouput port linked respectively to the first optical head and to the second optical head and a fourth port linked to the optical measurement pathway, the circulator being devised in such a way that, when the second secondary beam is polarized linearly in a predetermined plane, it is conducted towards the second port, when the second secondary beam is polarized linearly in a plane perpendicular to the said predetermined plane, it is conducted towards the third port, the first beam backscattered by the first measurement zone, received by the first optical head and polarized perpendicularly to the predetermined plane, entering on the second port is conducted towards the fourth port, and the second beam backscattered by the second measurement zone, received by the second optical head and polarized in the predetermined plane, entering on the third port is conducted towards the fourth port.