Fiber Optics

2021 ◽  
pp. 239-277
Keyword(s):  
Author(s):  
James F. Mancuso ◽  
William B. Maxwell ◽  
Russell E. Camp ◽  
Mark H. Ellisman

The imaging requirements for 1000 line CCD camera systems include resolution, sensitivity, and field of view. In electronic camera systems these characteristics are determined primarily by the performance of the electro-optic interface. This component converts the electron image into a light image which is ultimately received by a camera sensor.Light production in the interface occurs when high energy electrons strike a phosphor or scintillator. Resolution is limited by electron scattering and absorption. For a constant resolution, more energy deposition occurs in denser phosphors (Figure 1). In this respect, high density x-ray phosphors such as Gd2O2S are better than ZnS based cathode ray tube phosphors. Scintillating fiber optics can be used instead of a discrete phosphor layer. The resolution of scintillating fiber optics that are used in x-ray imaging exceed 20 1p/mm and can be made very large. An example of a digital TEM image using a scintillating fiber optic plate is shown in Figure 2.


1984 ◽  
Author(s):  
Dorothy L. Finley ◽  
Irving N. Alderman ◽  
M. Sue Bogner ◽  
Nancy B. Mitchell
Keyword(s):  

1993 ◽  
Vol 10 (3) ◽  
pp. 312-325
Author(s):  
Dilnawaz A. Siddiqui

Instructional/Communication Technology has come to mean, in a narrowsense, media hardware or a set of tools enabling human beings toovercome their physical limitations. Etymologically, it means one or moretechniques, both concrete and abstract, that help human beings solveproblems. By extension, instructional technology (IT) means all tools atour disposal for facilitating learning. Tickton (1971) defines the purporeof IT as making "education more productive and more individual, to giveinstruction a more scientific base, and to make instruction more powerful,learning more immediate, and access more equal." While the technologyitself might be neutral as a medium and as a means of instructional communication,it is the natw of its use, in terms of timely and appropriatemessages, that is the key to understanding its consequences. It is this finalfactor upon which society needs to focus.The tecent combination of computer, video, fiber optics, satellite television,and other state-of-the-art technologies has enabled a small groupto control the lives of billions. Instructional technology has also Meritedits own share of this instantaneous global power. As a result traditionalboundaries between IT and mass media communication have blurred somuch that IT sounds like a misnomer.It has now become a platitude to say that the nation that controlledthe sealanes in the nineteenth century, or that controlled the airways inthe twentieth century, controlled the whole world. In the twenty-first century,it appears that whoever controls the airwaves will control the worldand whatever is beyond it. Thus the most explosive confluence of ...


1983 ◽  
Author(s):  
E. L. Althouse ◽  
D. M. Kopp ◽  
R. G. Trgina
Keyword(s):  

Fuel ◽  
2021 ◽  
Vol 283 ◽  
pp. 118948 ◽  
Author(s):  
Yankun Sun ◽  
Ziqiu Xue ◽  
Tsutomu Hashimoto ◽  
Yi Zhang
Keyword(s):  

1990 ◽  
Vol 68 (5) ◽  
pp. 1854-1864 ◽  
Author(s):  
E. Heidelberger ◽  
R. B. Reeves

A planar monocellular layer of whole blood (WB) sandwiched between two Gore-Tex membranes is used to study O2 uptake and release kinetics at 37 degrees C. Gore-Tex, a highly gas-permeable open mesh of Teflon fibrils (78% porosity, 0.2-microns pore size, 75-microns thick), constrains WB to form a thin film without imposing an appreciable gas diffusion barrier. WB layer thickness, measured by isotope dilution, is 1.7 +/- 0.2 microns. WB films are mounted between fiber optics in a gas flow tube for dual-wavelength (536/558 nm) oxyhemoglobin saturation measurements after a step change in PO2. For isocapnic (6% CO2) step changes in PO2 between 0 and 104 Torr, WB O2 uptake half time is 10.4 +/- 0.9 ms; WB O2 release half time is 20.6 +/- 2.4 ms. Half-time values are half of those previously reported. The thin-layer method reduces erythrocyte diffusion boundary layer error and thereby offers an attractive alternative to classical rapid fluid-mixing techniques.


Sign in / Sign up

Export Citation Format

Share Document