H - Electricity – 05 – G
Patent
H - Electricity
05
G
358/11.4
H05G 1/00 (2006.01) G01N 23/207 (2006.01)
Patent
CA 1141483
4-12-1979 - 1- PHA 20897 ABSTRACT: "X-ray powder diffractometer". A computer controlled asymmetric texture- sensitive parafocussing X-ray powder diffractometer employs an incremental rotating specimen holder for azimuthal ro- tation through an angle ?. The specimen holder is rotatable through an angle ? from a symmetric position in which the specimen surface normal makes an angle (90 - ?)° with both the source-to-specimen and detector-to-specimen directions. In order to maintain the Brentano focussing condition, the detector is supported on a slide which can be moved towards and away from the specimen by a stepper-motor drive. A ratio K of the detector-to-specimen distance R on the one hand and the X-ray source-to-specimen distance P on the other hand is constrained to a range c < K > f. The desired focussing condition is realized by computer control which maintains K = sin (?+?)/sin (? - ? ) and modifies the measured value of the intensity by multiplying it by 0.5(K + l) K0.75exp [/UR (K - 1)] where /u is the linear absorption coeffi- cient for air.
344300
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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