Design Considerations For A Solid-State Image Sensing System

The intent of this paper is to develop an understanding of the design considerations for a solid-state image sensing system. The method used is to individually discuss the operational and design factors for the following system components and considerations: solid-state image sensors, illumination sources, common types of lenses, lens and image sensor selection, and the techniques involved in system evaluation. The sensor will be discussed in terms of element resolution and configuration, spectral response, theory of operation, and video processing requirements. Common types of illumination sources and lenses will be outlined as they apply to solid-state imaging systems. The section on lens and image sen-sor selection has an example of how to proceed from an application concept to the selection of an array and lens. System performance is evaluated in terms of the Modulation Transfer Function (MTF). The MTF of each component part (i.e., lens, sensor, and video processing circuit) is considered from the standpoint of how each individual MTF combines to affect the MTF of the entire system. Experimental results are used to reinforce calculated MTF relationships. Careful consideration must be given to how each component part affects the overall performance of a solid-state image sensing system. The Modulation Transfer Function is most commonly used to characterize the performance of an optical or electro-optical system.