Online detection device and method for surface defects of sequence optical element based on array camera

The invention provides an online detection device and method for surface defects of a sequence optical element based on an array camera. The device comprises an illumination system, an optical lens, adigital camera or the array camera, a two-dimensional motion device and a digital image processor. The main innovation points are as follows: the two-dimensional motion device is used for driving thecamera to translate in the horizontal and vertical directions to achieve the effect of the array camera, by using an array camera detection system, the tedious step of focusing and imaging a plurality of optical elements under different object distances is omitted, so that the imaging focal length of an imaging system can be flexibly changed by setting different reconstructed object distances. The method can be applied to online detection of the surface defects of the optical elements, and has great significance for improving the simultaneous online detection speed of the surface defects of the plurality of optical el