System configuration

The LDA comprises three distinct parts:

■ an optical emission device, comprising a laser and a system of division of the beam (beam splitter);

■ a receiving device comprising an optical system as well as a photomultiplier;

■ a system for processing signals received by the photomultiplier.

4.3.4.1 Optical emission device

This device consists of a laser beam which is split into two parallel beams by a prism, then the two beams pass through a lens that makes them converge in its focus. The point of intersection of the two beams is the measurement volume. In the case of the reference beam LDA, a neutral density filter is interposed in the path of one of the beams in order to reduce its intensity.

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