การพิสูจน์เชิงทดลองระบบภาพผีแบบคลาสสิกโดยใช้เลเซอร์ความยาวคลื่น 405 นาโนเมตรและระบบวิเคราะห์สหสัมพันธ์ด้วยกล้องสองตัว

Abstract

This research presents the design, construction, and quantitative analysis of a Classical Ghost Imaging (CGI) system utilizing a 405 nm laser diode as the light source. This system relies on second-order statistical correlation to reconstruct the spatial structure of the object without using conventional imaging lenses. The Gaussian beam is converted into a complex speckle pattern through a finely ground glass diffuser before being split by a beam splitter into two paths of equal optical path length. In the object path, the speckle light undergoes amplitude modulation through a 1.5×1.5 cm aluminum foil letter "F" mask, and the total energy is recorded by a camera acting as a Bucket Detector. Meanwhile, the reference path records the speckle structure using a high-resolution camera without the object. The experiment collected image data from 100 to 1,200 frames to study the image recovery behavior. The results show that the reconstructed object image is sharp, and the Signal-to-Noise Ratio (SNR) varies directly with the square root of the number of frames (√N), which is consistent with classical light theory. This research supports the guidelines for applying CGI to image through highly scattering media.