Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1989-04-05
1991-06-18
Rosenberger, Richard A.
Optics: measuring and testing
For optical fiber or waveguide inspection
356339, 356432, G01N 2147, G01N 2159, G01N 102
Patent
active
050245260
ABSTRACT:
A measuring instrument for simultaneous in situ determination of the spectral scatting and absorption coefficient, which can also be called an extinction meter, has a modulated light source and an optical system encompassing the hemisphere; the optical system has a multiply folded ray path with a focal point in the volume to be measured, and through this system the measurement signal is projected to detectors. The scattering measurement signals, which are maximally enlarged in this way, are then separated from those for the absorption. The extinction meter also has not only an integrating nephelometer for monitoring purposes but also a transmission meter for low transmission factors. Because of the small three-dimensional size and the streamlined shape of the measuring portion of the extinction meter, the extinction meter can be carried in aircraft and surface vehicles. Because of the disposition of the optical system, the error in the measurement values is negligible, in comparison with other instruments with which only the scattering coefficient can be determined. Moreover, the calibration value during a measurement phase can be determined both automatically and manually. Contamination of the instrument with gas to be measured is reduced, by the stabilization of a turbulence ring by means of baffles. Moreover, interference with the flowing aerosol on the part of the instrument is largely eliminated via a hoop-like hood functioning like a wing-tip slot.
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"Applied Optics", vol. 21, No. 1, 1982, pp. 90-93, Photoacoustic Cell Using Elliptical Acoustic Focusing, by Jean-Marc Heritier, J. E. Fouquet and A. E. Siegman.
Von G. H. Ruppersberg, "Registrierung der Sichtweite mit dem Streulichtschreiber", [Recording of Visual Range with the Scattered Light Plotter], reprint from, Beitrage zur Physik der Atmosphare, [Atmospheric Physics Journal] 37, 3/4, 1964, pp. 252-263.
R. G. Beuttell and A. W. Brewer, "Instruments for the Measurement of the Visual Range", Journal of Scientific Instruments 26 (1949), pp. 357-359.
R. J. Charlson, H. Hovath and R. F. Pueschel, "The Direct Measurement of Atospheric Light Scattering Coefficient for Studies of Visibility and Pollution", Atmospheric Environment, (1967), vol. 1, pp. 469-478.
Deutsche Forschungs -und Versuchsanstalt fur Luft -und Raumfahrt
Rosenberger Richard A.
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