Instrument responsive to back-scattered or back-reflected radiat

Optics: measuring and testing – Refraction testing – Prism engaging specimen

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

356 28, 356225, 250574, 250237R, G01N 2100, G01P 336

Patent

active

039985520

ABSTRACT:
An instrument for responding to backscattered or backreflected radiation from a path through a medium in which a beam of electromagnetic radiation is transmitted along the path, and a receiver system is arranged to receive backscattered radiation returning along the path substantially coaxially with the beam, the receiver system including detection means for the backscattered radiation and equalizing means for producing a substantially equal response regardless of the point of backscatter along the path. The equalizing 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 radiation reaching the detection means from various points along the path does not vary in intensity due to the different distances of the points from the detection means. The passive 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 instrument 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 beamsplitter 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 from a single source are produced, with the respective returns concentrated on a single detector.

REFERENCES:
patent: 3062964 (1962-11-01), Lubin
patent: 3310680 (1967-03-01), Hasegawa
patent: 3822940 (1974-07-01), Goldfischer
patent: 3873206 (1975-03-01), Wilcoch

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Instrument responsive to back-scattered or back-reflected radiat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Instrument responsive to back-scattered or back-reflected radiat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Instrument responsive to back-scattered or back-reflected radiat will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1836257

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.