Optical sensor is a device that can detect the change of light, and judge the existence and position of paper by transmitting and receiving optical signals. When the paper is placed on the bronzing machine, the optical sensor will emit a light beam, and the position and characteristics of the paper can be determined by receiving the reflection or transmission of the light beam. These sensors can detect the thickness, color, transparency and other properties of paper, so as to accurately identify paper. Based on these recognition results, the bronzing machine can automatically adjust the hot stamping position and strength to ensure that the stamps are printed in the correct position and avoid damaging the paper. By using optical sensors to identify paper, the museum stamping machine can complete the stamping task efficiently and accurately, and ensure the integrity and protection value of paper.