Development of a Measuring Instrument for the Coefficient of Luminous Intensity of Retro-Reflection of Miniature Telecentric Cameras

In this paper, the optical properties of a miniature telecentric camera are studied analytically and experimentally. By means of optical properties, the luminous intensity of retro- reflection of a miniature telecentric optical system is investigated. First, from a simulation the theoretical value of the coefficient of luminous intensity of retro- reflection of a miniature telecentric system is estimated. Second, a miniature telecentric camera device is designed, and the value of the coefficient of luminous intensity of retro- reflection of the actual device is measured through experiment. From simulation and experiment, we found that both the estimated and observed values of the coefficient of luminous intensity of retro- reflection range from 0.002 to 0.03 m(2)/sr (P384200CPH: 0.0042 - 0.018 m(2)/sr, P285200CPH: 0.0045 - 0.0297 m(2)/sr, P321450S: 0.0021 - 0.00963 m(2)/sr) at 1.4 to 4.9 arcminute. The results prove the significance of the mechanisms used to design the miniature telecentric camera, and the experimental method. Accordingly, with these significant results, this study contributes to the development of theory and practice in optical engineering science.