Radiant energy – Inspection of solids or liquids by charged particles
Patent
1984-12-17
1987-01-06
Anderson, Bruce C.
Radiant energy
Inspection of solids or liquids by charged particles
250307, 378 63, G01N 2304
Patent
active
046348689
ABSTRACT:
Non-invasive and non-destructive apparatus and method for imaging, recording, and comparing the mass density distributions and thicknesses of test specimens (19F, 19B). A source of medium-to-high-energy photons (3) directs a photon beam (4) at an electron source (17) comprised of high atomic number material, which emits in response thereto electrons (9F, 9B), some of which are not absorbed and not widely scattered by the test specimens (19F, 19B), but are transmitted therethrough and captured on one or more photographic films (15F, 15B) in contact with said specimens (19F, 19B). Net recorded film (15F, 15B) densities are in inverse relation to the mass density distribution of the corresponding test specimen (19F, 19B). A filter (5) is interposed between the photon source (3) and the capture film (15B) when back emission imaging (B) is employed. The filter (5) is optional when forward emission imaging (F) is used. The filter (5) absorbs photons (4) that have an energy sufficiently low to create an unwanted X-ray response on the capture film (15F, 15B) within the period required for the desired electron (9F, 9B) imaging.
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Anderson Bruce C.
Ford Aerospace & Communications Corporation
Guss Paul A.
Radlo Edward J.
Sadler Clifford L.
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