Diffraction astigmation formed by the grating diffraction light was investigated. The grating diffraction astigmation varies with the incidence angle and the characteristics of the variation were discussed. The angles of incidence light and other conclusions corresponding to the minimum diffraction astigmation were obtained based on a systematic analysis.
A method for displaying ordinary transmission holograms with white light and grating was investigated further. Based on the basic principle of this method, factors coming from the case of application and having influence on the image color and quality were analyzed systematically.
We reported the previous research of spectrum imaging with a double-grating imaging system in 2001. In this paper, we will investigate the energy of the image obtained using the same imaging method. A mercury-vapor lamp was used as the light source to measure the light energy of the image at different positions for four grating combinations. The experimental results were analyzed systematically. The factors affecting the brightness of the image were also discussed in this paper.