FIELD: physics.
SUBSTANCE: measuring device (14) has a sensor (16) for determining at least one component and/or at least one property of the material (4). The sensor (16) has at least one light source (18) which directs at least one light beam (20) onto the investigated material (4). The measuring device (14) has at least one reference object (34, 32, 33) for calibrating the measuring device (14). Part of the light beam (20) of the light source (18) is diverted onto the reference object (34, 32, 33).
EFFECT: avoiding the need for alternate switching from the investigated material to the reference object.
12 cl, 4 dwg
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