TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 79

The Fiber Optics Illustrated Dictionary - Part 79 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary toward the radiant energy source. The four beams of light exiting from the pyramid are re-imaged with a display system to yield four images. The pyramid acts like a knife-edge test system revealing optical aberrations carried by the light electromagnetic beam. The system has been tested in astronomical applications. See knife-edge focusing. pyrheliometer An instrument for measuring infrared radiation which borders the visible spectrum on one side and radio waves on the other. pyroelectric detector A detector that takes advantage of the characteristic of a pyroelectric material to build up a charge when exposed to pulsed or modulation radiant energy. Due to the quick response times of pyroelectric detectors they are more useful for some types of applications and environments than other types of thermal detectors that have difficulty separating the impulse heat from ambient heat due to slower response times. See photodetector pyroelectric thermocouple. pyroelectric A usually crystalline substance having polarized molecular properties in the absence of applied voltage. When stimulated by heat the molecules become more active expanding and altering the polarization of the material enough to build up an electrical charge on opposite surfaces of the material. Thus a subtle electromagnetic impulse flows between the surfaces. pyroelectricity Electromagnetic charges created through a change in temperature. Pyroelectricity refers to the means of generating the charge not the nature of the charge itself which is the same as others. Crystals have valuable oscillating characteristics and are commonly used in timing mechanisms and radio electronics and some have interesting pyroelectric activity when exposed to heat. See pyroelectric pyroelectric detector. pyromagnetic effect The combined effect of heat and magnetism in a material or circuit. pyrometer An instrument for determining temperature that is a heat sensor for detecting and optionally

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