26 June 2017 Relationship of parameters of optical equisignal zone system for providing constant static characteristics
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The paper deals with a type of optical-electronic instruments based on the optical equisignal zone. For the most applications the difference signal in the equisignal zone is required to be independent on the distance. The purpose of the study is to find interrelation of parameters of an optical system, of sources and of the receiving part providing constant difference signal. It is known that if the source has a uniform radiance and an ideal objective (without aberrations) is used, in order the width of the transitional zone be independent on the distance, the objective must be focused on infinity. In practice homocentricity of the pencil of rays is influenced by the spherical aberration. Study of impact of the 3th order abberrations on the width of the transitional zone, and as a result, on radiance distribution, allowed to find equations linking the width of the transitional zone, exit pupil diameter, and irradiance of the sources. It is shown that the relative difference signal depends on relation of the product of spherical aberration value and distance to the exit pupil diameter, thus relative difference signal can be reduced with refocusing on a required distance. Based on obtained relations and experimental results we conclude that using an appropriate processing of the difference signal, correction of spherical aberration of the objective and focusing the projector into infinity, constant static characteristics may be achieved.
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Anton A. Maraev, Anton A. Maraev, Aleksandr N. Timofeev, Aleksandr N. Timofeev, Vadim F. Gusarov, Vadim F. Gusarov, Sergey V. Mednikov, Sergey V. Mednikov, Aleksandr A. Klimov, Aleksandr A. Klimov, } "Relationship of parameters of optical equisignal zone system for providing constant static characteristics", Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103294J (26 June 2017); doi: 10.1117/12.2272040; https://doi.org/10.1117/12.2272040

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