Method for capturing at least particle compositions in a monitoring region with an optical detection apparatus, and detection apparatus

A method for capturing at least particle compositions in a monitoring region of a vehicle that exhibit a temporally dynamic behaviour with an optical detection apparatus of the vehicle, the method comprising, during at least one measurement,

• transmitting optical transmission signals into the monitoring region;
• receiving transmission signals that are reflected at particle targets of any particle compositions present in the monitoring region as particle reflection signals;
• determining the presence of dynamic particle compositions from the particle reflection signals,
• wherein at least two measurements are performed with a temporal distance;
• ascertaining a particle target density or a variable characterizing the particle target density for at least one partial volume of the monitoring region from the particle reflection signals of each measurement,
• wherein when the particle target density or the variable characterizing it from the at least two measurements differs by more than a prescribed tolerance, determining that the particle reflection signals from the at least one partial volume are caused by the reflection of the transmission signals at dynamic particle compositions;
• ascertaining a particle target density difference of the particle target density or a difference of the variable characterizing the particle target density for a plurality of partial volumes during a plurality of measurements;
• forming a stochastic variance based on the particle target density difference of each partial volume in the plurality of partial volumes, and
• comparing the stochastic variance with a prescribed threshold value.