Measurement of velocity of continuously moving material - involves laser beam directed at surface and reflected light spots picked up by receiver

摘要

The gate (6) is positioned in the beam path (2) of the light and has a central aperture (7) for the light rays (5, 5'). On the side of the light source (1), near the gate there is a deflecting optical system to guide the reflected light radiation passing through the gate. Following on this deflecting optical system, there is a facility for bunching the rays onto the receiving surface (14) of the receiver. The deflecting optical system can have a flat deflecting surface and there can be a converging lens (13) between it and the receiving surface. The deflecting optical system can be a prism (8).