Patent ID: 9255890
Filing Date: 2016-02-09
CPC Classification: G01N

Claim Text:
1. An apparatus ( 10 ) for measuring the light scattered from a measured zone ( 12 ), the apparatus having a light transmitter ( 14 ) for transmitting a light beam ( 18 ) into the measured zone ( 12 ) and having a light receiver ( 22 ) with a reception optics ( 24 ) for detecting light scattered in the measured zone ( 12 ), wherein an adjustment unit is provided to change between a measuring mode in which the optical axes of the light transmitter ( 14 ) and of the reception optics ( 24 ) stand at an angle with respect to one another and intersect in the measured zone ( 12 ) and a test mode in which the optical axes of the light transmitter ( 14 ) and of the reception optics ( 24 ) are aligned in parallel with one another, wherein the light beam ( 18 ) successively sweeps over the reception optics ( 24 ) for recognizing contaminants, and wherein the reception optics ( 24 ) is rotatably held at a displaceable rotary axle ( 32 ); and the adjustment unit first rotates the reception optics ( 24 ) about the rotary axle until the optical axis of the reception optics ( 24 ) is in parallel with the optical axis of the light transmitter ( 14 ) in the test mode and then displaces the rotary axle ( 32 ) together with the reception optics ( 24 ).