| abstract |
An optical detector ( 110 ) is disclosed, the optical detector ( 110 ) comprising:n at least one spatial light modulator ( 114 ) being adapted to modify at least one property of a light beam ( 136 ) in a spatially resolved fashion, having a matrix ( 132 ) of pixels ( 134 ), each pixel ( 134 ) being controllable to individually modify the at least one optical property of a portion of the light beam ( 136 ) passing the pixel ( 134 ); at least one optical sensor ( 116 ) adapted to detect the light beam ( 136 ) after passing the matrix ( 132 ) of pixels ( 134 ) of the spatial light modulator ( 114 ) and to generate at least one sensor signal; at least one modulator device ( 118 ) adapted for periodically controlling at least two of the pixels ( 134 ) with different modulation frequencies; and at least one evaluation device ( 120 ) adapted for performing a frequency analysis in order to determine signal components of the sensor signal for the modulation frequencies. |