Experimental study on laser parallel processing of DM code

The data matrix (DM) code has large information storage capacity, wide coding range and high reliability, which is an important carrier of people’s daily information exchange. In order to realize the parallel processing method of DM code, the influence of the distance value and gray value of DM code on the recognition time was analyzed experimentally. The DM codes under different conditions were scanned several times, and the reading time was recorded. The critical dot diameter value of DM code was determined to be 11 pixels, and the critical gray value was 220. On this basis, a parallel processing method of DM code based on spatial light modulator was designed, and experimental verification of laser parallel processing of DM code was carried out in quartz glass. Compared with the traditional single-beam laser marking two-dimensional code, the processing efficiency was improved.