Asymmetric texture sensitive X-ray powder diffractometer

Details Asymmetric texture sensitive X-ray powder diffractometer Asymmetric texture sensitive X-ray powder diffractometer

1979-01-31

1980-04-22

Church, Craig E.

Radiant energy

Coded record and readers; invisible radiant energy type

250277CH, G01N 2320

Patent

active

041996780

ABSTRACT:
An interactive computer controlled asymmetric texture-sensitive parafocussing X-ray powder diffractometer employs an incremental rotating specimen device which permits azimuthal rotation (through the angle .phi. of the disc-shaped specimen about its surface normal. The rotating specimen device, rotatable about the principal diffractometer axis, can be offset an angle .alpha. from the symmetric position in which the specimen surface normal makes the angle (90-.theta.).degree. with both the source-to-specimen and detector-to-specimen directions. In order to maintain the Brentano focussing condition, the photon-counting detector is supported on a slide which is translated towards or away from the specimen by a stepper-motor drive lead screw. K, the ratio of the detector-to-specimen and x-ray source-to-specimen distances is constrained to the specified range c<K<f, where c is the smallest and f the largest ratio achieved. The focussing condition is realized by computer control which maintains K=sin (.theta.+.alpha.)/sin (.theta.-.alpha.) and modifies the measured intensity by multiplying its value by 0.5(K+1)K.sup.0.75 exp[.mu.R(K-1)] where R is the source-to-specimen distance, and .mu., the linear absorption coefficient for air.

REFERENCES:
patent: 3509336 (1970-04-01), Wilchinsky et al.

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