X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1984-12-21
1986-10-21
Anderson, Bruce C.
X-ray or gamma ray systems or devices
Specific application
Absorption
378 53, 378 54, 378 55, 364414, G01N 2306
Patent
active
046189750
ABSTRACT:
Nondestructive analysis of a porous, inhomogeneous, generally cylindrical object, such as a soot boule (12), comprised of n known components, where n is an integer, is achieved by scanning the boule with a beam (18) comprised of photons, each having a distinct energy within one n-1 energy groups. The intensity of the photons within each of the n-1 energy groups leaving the boule is detected by a detector (22) and is measured by a pulse height/scaler analyzer (30) at each of a plurality of separate heights t.sub.i of the beam (18) as measured from the center of the boule. A computer (31) determines each of n-1 attenuation coefficients .mu..sub.1 (r), .mu..sub.2 (r), . . . .mu..sub.n (r), representing the attenuation of the intensity of the photons in each of the n-1 energy groups, respectively, at each height t.sub.i of the beam in accordance with the output data furnished by the scaler/analyzer. From the n-1 attenuation coefficients, the computer (31) determines the density .rho.(r) and the respective molecular mass fractions x.sub.1 (r), x.sub.2 (r) . . . x.sub.n (r) of the n molecular components of the boule (12) at each height t.sub.i of the beam.
REFERENCES:
patent: 3414725 (1968-12-01), Evans
patent: 3435220 (1969-03-01), Hanken
patent: 3499736 (1970-03-01), Zwaneburg
patent: 3996471 (1976-12-01), Fletcher et al.
patent: 4095106 (1978-06-01), Wallace
patent: 4200792 (1980-04-01), Fanger et al.
patent: 4217027 (1980-08-01), MacChesney et al.
patent: 4227806 (1980-10-01), Watkins
patent: 4282433 (1981-08-01), Loffel
patent: 4284895 (1981-08-01), Morgan et al.
patent: 4330835 (1982-05-01), Gehm
"Tomography: An Overview of the AECL Program" by Allan et al. Applied Optics, vol. 24, #23, 12/1/85.
"Tomography for Properties of Materials that Bend Rays: A Tutorial by Charles M. Vest Applied Optics, vol. 24, #23, 12/1/85.
"Mathematical Foundations of Computed Tomography" by Smith et al. Applied Optics, vol. 24, #23, 12/1/85.
"Method of Inspecting Optical Fiber Preforms Using X-Ray Absorption Measurements", H. Takahashi, I. Nakamura, T. Tadatani and T. Kurowa, Japanese Journal Furukawa Denko Jiho, 68, pp. 143-149 (1980).
"Applicative Investigation of X-Ray Non-Destructive Inspection Technique for Measurement of Core Diameters and Germanium Doping Concentration Profiles of Optical Fiber Preforms" by H. Takahashi, et al., published in the Conference Proceedings of the Optical Communications Conference, Sep. 17-19, 1979, Amsterdam, The Netherlands at pp. 14.4-1-14.4-4.
Anderson Bruce C.
AT&T - Technologies, Inc.
Freeman John C.
Levy R. B.
LandOfFree
Method and apparatus for analyzing a porous nonhomogeneous cylin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for analyzing a porous nonhomogeneous cylin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for analyzing a porous nonhomogeneous cylin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1293478