Device and method for distortion-free online monitoring system of selective laser melting pool

The invention provides a device and method for a distortion-free online monitoring system of a selective laser melting pool, and relates to the technical field of selective laser melting forming detection. The device comprises an image acquisition mechanism, a radiation signal acquisition mechanism, a dichroscope mechanism, a laser, a scanning galvanometer and a processor which are arranged on a selective melting chamber platform, the dichroscope mechanism is respectively connected with the image acquisition mechanism and the radiation signal acquisition mechanism; the image acquisition mechanism is perpendicular to the selective melting chamber platform; a radiation acquisition circuit of the radiation signal acquisition mechanism is parallel to the selective melting chamber platform, and a light inlet hole of the radiation signal acquisition mechanism is communicated with a second light outlet hole of the dichroscope; the laser and the scanning galvanometer are oppositely arranged on the two sides of the di