G - Physics – 01 – N
Patent
G - Physics
01
N
343/4, 33/46
G01N 21/00 (2006.01) G01N 21/53 (2006.01) G01S 7/48 (2006.01) G01S 7/481 (2006.01) G01S 17/00 (2006.01)
Patent
CA 1036697
ABSTRACT An instrument for responding to backscattered or backreflected rad- iation form a path through a medium in which a beam of electromagnetic radia- tion is transmitted along the path, and a receiver system is arranged to re- ceive backscattered radiation returning along the path substantially coaxially with the beam, the receiver system including detection means for the back- scattered radiation and equalizing means for producing a substantially equal response regardless of the point of backscatter along the path. The equaliz- ing means comprises a passive radiation transmission structure interposed in the path of return prior to the detection means, the passive structure having a substantially constant acceptance solid-angle for the returning radiation from points over the range of the path whereby raidation reaching the detec- tion means from various points along the path does not vary in intensity due to the different distances of the points form the detection means. The pas- sive structure is shown in the form of a full circular hole and a doughnut- shaped hole in an opaque plate, with the return beam focused to fill the hole out to a range of interest. Other passive structures are illustrated by a Fabry-Perot filter combined with a telescope and a bundle of opaque walled tubes. Transmissivity of a medium out to a point r is determined by the ratio of the integral of power from r to an outer limit range L in which the passive structure is still functional, as numerator, over the integral from the inst- rument to limit L as denominator. The coaxial array is shown achieved by use of a beam splitter, the beam from the source proceeding via the beam-splitter outwardly, the beam-splitter sized so that all return signal reaching the detector is treated equally by the beam-splitter. A multiple beam-splitter is shown by which multiple beams form a single source are produced, with the respective returns concentrated on a single detector.
233635
Brouwer Willem
Shuler Marion P. (jr.)
Stewart Harold S.
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