Optics: measuring and testing – Photometers – Photoelectric
Reexamination Certificate
2006-06-27
2006-06-27
Lauchman, Layla G. (Department: 2877)
Optics: measuring and testing
Photometers
Photoelectric
C356S432000, C356S218000
Reexamination Certificate
active
07068362
ABSTRACT:
The present invention provides apparatus for a beam transmissometer. In an embodiment, the beam transmissometer includes a LED signal source, collimating apparatus, a retroreflector that directs the projected beam, imaging apparatus that directs the beam onto a detector that converts the projected beam into an electrical signal, and signal processing circuitry that enhances the reception of the optical beam. The LED signal source is modulated in a pulsed fashion so that the effects of beam reflection are ameliorated. Signal processing circuitry amplifies, filters, and synchronizes to the electrical signal. A calculating unit uses the processed signal to determine a beam attenuation coefficient, which is indicative of the visibility of a medium in which the transmissometer is immersed. A method is also provided for aligning optics of a beam transmissometer. The method determines an offset and a rotation of a retroreflector housing that causes an optical beam to be centered.
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Decker Kirk S.
Murdock Thomas M.
Rennich Karen D.
Velky James T.
Lauchman Layla G.
Roca Benjamin Y.
The Johns Hopkins University
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