課程簡介
A common interest to optics and electronics is that both of them are in an energy form and may carry a lot of information. Electro-optical system engineering is a science and a technology based on the conjunction of optics with electronics.
The large information-carrying capacity of light derives from the high frequency of its oscillations. The implication is that optical processes occur on a time-scale of order one optical period (~ 10-14 sec): and thus that they can absorb and convey information on the same kind of time-scale, leading to information rates of the order of the optical frequency.
Electrons, unlike photons, carry electrical charge. As a consequence they respond to electric and magnetic fields, which thus can be used to control and manipulate them.
This is a significant advantage, since modern electronics provides finely adjustable fields at a sophisticated level of flexibility.
The scope of this course is limited to that of electro-optical systems for information processing and does not cover systems designed to utilize optical energy for work.
The emphasis is upon systems wherein information is conveyed by means of an electro-optical beam such as in remote sensing, guidance and tracking, and fiber optic (laser) communication systems with emphasis upon radiometric detection. Any system must be capable of detecting incident electromagnetic flux before any data processing can occur; thus, attention is also given to the optimization of systems for maximum signal-to-noise ratio.
Any electro-optical system for information processing can be modeled in terms of six basic subsystems: the source, intervening media, optical subsystem, focal plane, signal-conditioning electronics, and output (display).
The pedagogical approach is threefold: (1) to trace the signal flow from the source through the system; (2) to reveal some radiometric performances in terms of the signal-to-noise ratio for optimization and sensitivity analysis and (3) to show how these systems did affect our daily lives: optical communications: compact audio-discs:
laser printers, liquid-crystal, digital cameras, laser surgery, supermarket laser check- outs, to name just a few.
This course provides a system-oriented approach to radiometric design and is designed for the senior and first-year graduate student of engineering and/or science, and will divided into two parts for two semesters.
Part I considers that level of design in which system and subsystem figures of merit are defined and utilized to accomplish a radiometric feasibility study.
The feasibility study includes source characterization, flux transfer, the performance of optical systems and its throughput, detection noise, and uncertainty considerations to arrive at system performance objectives. The consideration of system and
subsystem performance in terms of figures of merit provides an overview of important design criteria and should prepare a person to direct and monitor the development of a system without knowledge of detailed subsystem design.
Part II discusses detailed design considerations of various configurations of some of the subsystems introduced in Part 1. No single book could ever provide an all- inclusive coverage of the entire field of electro-optics, nor could any one author be an expert in all aspects of system and subsystem design.
Numerous e-o system examples are provided in the text, such as digital imagers and fiber communication, to illustrate numerical performance and dimensional analysis as applied to real-world problems.
