Detection device and method

The invention provides a detection device and method. The detection device comprises a light source 210, a polarization module 220 and an imaging module 230. The polarization module 220 is arranged between the light source 210 and the imaging module 230, and the sample 240 to be tested is arranged in front of the polarization module 220. The light source 210 emits a light beam 210a, and the imaging module 230 generates a primary image and a secondary image of the light source 210 according to the light beam 210b and the light beam 210c after passing through the polarization module 220. Wherein the light beam 210b is obtained after the light beam 210a is transmitted through a sample 240 to be detected, and the light beam 210c is obtained after the light beam 210a is transmitted and reflected through the sample 240 to be detected. By introducing the polarization module between the to-be-measured sample and the imaging module, light beams before passing through the imaging module can be polarized, and the optica