Optical velocimetry systems and methods for determining the velocity of a body using fringes generated by a spatial light modulator

摘要

A velocimetry system for measuring the velocity of a moving body propagating through a measurement volume includes a light source for emitting a light beam, a controller for generating a modulation pattern corresponding to a desired set of fringes to be generated in the measurement volume, and a spatial light modulator operatively connected to the controller to receive therefrom the modulation pattern. The spatial light modulator is configured to spatially modulate the light beam according to the modulation pattern in order to generate the desired set of fringes in the measurement volume. Also provided are a light detector for measuring the energy of the light scattered by the moving body as it intersects the fringes, and a data analysis unit operatively connected to the light detector and adapted to determine the velocity of the moving body from at least one fringe characteristic and the energy of the scattered light measured.

主权项

1. A velocimetry system for measuring the velocity of a moving body propagating through a measurement volume, comprising:
a light source for emitting a light beam; a controller for, generating a modulation pattern corresponding to a desired set of fringes to be generated in the measurement volume; a spatial light modulator operatively connected to the controller unit to receive therefrom the modulation pattern, the spatial light modulator being configured to generate the desired set of fringes in the measurement volume by spatially modulating the light beam according to the modulation pattern; a light detector for measuring the energy of the light scattered by the moving body as it intersects the fringes; and a data analysis unit operatively connected to the light detector and adapted to determine the velocity of the moving body from at least one characteristic of the fringes and the energy of the scattered light measured by the light detector, wherein the controller is configured to control the spatial light modulator and to transmit the modulation pattern to the spatial light modulator, the modulation pattern providing a value of an optical property for each point of the spatial light modulator.