CSP system, sensor arrangement, method and use

Concentrated solar power (CSP) system, comprising:

• a reflector (SP);
• a receiver tube (R);
• a shadow receiver (6) arranged and adapted to receive the, preferably full, shadow of the receiver tube;
• a first digital camera (K) fixedly attached to the CSP system and arranged and configured to acquire a first image of the reflector and of the shadow receiver;
• and
• a controller configured to:
• identify a first portion of the first image that comprises the reflector and a second portion of the first image that comprises the shadow receiver;
• determine a degree of soiling of the reflector based on the first portion of the first image and, preferably, ignore all information contained in the second portion of the first image for determining said degree of soiling;
• and
• determine an adjustment of the orientation of the reflector based on the second portion of the first image and, preferably, ignore all information contained in the first portion of the first image for determining said adjustment.