Journal ArticleDOI
Light Collection within the Framework of Geometrical Optics
TLDR
In this article, the problem of light collection is examined from first principles within the framework of geometrical optics, and a generalization of the Abbe sine law appropriate to non-imaging systems is presented.Abstract:
The problem of light collection is examined from first principles within the framework of geometrical optics. From the outset, we distinguish between light collection and the usual theory of image formation. From phase-space considerations, we derive the sine inequality, a generalization of the Abbe sine law appropriate to nonimaging systems. We construct two- and three-dimensional nonimaging systems that reduce the f number to the least allowed by the sine inequality. Such systems give substantially improved light collection as compared with conventional systems.read more
Citations
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Journal ArticleDOI
Wireless in-house data communication via diffuse infrared radiation
F.R. Gfeller,U. Bapst +1 more
TL;DR: In this paper, a novel wireless broadcast/multi-access channel for flexibly interconnecting a cluster of data terminals located within the same room is described, where the transmission medium is diffusively scattered infrared radiation at 950-nm wavelength.
Journal ArticleDOI
Bolometers for infrared and millimeter waves
TL;DR: In this paper, a review of bolometric detectors for infrared and millimeter-wave measurements is presented, where the authors provide the background required by workers who wish to choose the appropriate bolometer technology for a given measurement or to evaluate a novel technology.
Journal ArticleDOI
The average distribution of solar radiation-correlations between diffuse and hemispherical and between daily and hourly insolation values
Manuel Collares-Pereira,Ari Rabl +1 more
TL;DR: In this article, the correlations of Hottel, Whillier, Liu and Jordan between diffuse and hemispherical, and between instantaneous (hourly) values and daily totals of solar radiation are recalibrated against pyrheliometer data for five stations in the U.S.
Journal ArticleDOI
Comparison of solar concentrators
TL;DR: In this paper, the authors compared a variety of solar concentrators in terms of their most important general characteristics, namely concentration, acceptance angle, sensitivity to mirror errors, size of reflector area and average number of reflections.
References
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Journal ArticleDOI
Efficient Light Coupler for Threshold Čerenkov Counters
H. Hinterberger,Roland Winston +1 more
Journal ArticleDOI
Cone Channel Condenser Optics
TL;DR: In this paper, a field lens is used to condense the radiation through a given area to the smallest possible size, which corresponds to achievement of the optimum f/number of 06 Reflection losses in the experimental model described.
Journal ArticleDOI
Particle Counting by Čerenkov Radiation
TL;DR: In this article, the problems associated with counting high energy mesons, electrons, and protons are discussed together with the design and performance of several types of particle counters, and some of the uses are discussed.
Journal ArticleDOI
Cone channel optics
TL;DR: The optical properties of a reflecting cone were studied theoretically and experimentally by Williamson as discussed by the authors, and the designations used in the above cited study will be retained as far as possible.