Patent GB-1198339-A (GB)
Title: X-Ray Goniometers
Inventor: LUECKE KURT
IPC: G01N23/20
Filed: 1968-08-02
Abstract: 1,198,339. X-ray diffraction apparatus. K. LUCKE. 2 Aug., 1968 [5 Aug., 19671, No. 37085/68. Heading H5B. A goniometer assembly comprises a carriage 5 adapted to hold a crystalline sample having a dominant plane face on which an X-ray beam is incident when the assembly is in use, the carriage being mounted on a support part a drive means connected with the carriage to cause it to execute a reciprocating movement with respect to the support part in the direction of arrows 4 which direction is parallel to the dominant plane face when the assembly is in use and mounting means holding the support part in position in relation the base of the goniometer, the mounting means including first, second and third rotary drive devices operable independently of one another to cause the support part with its associated carriage to rotate about axis 1 which remains perpendicular to the rectilinear path 4 during operation of the drive devices about axis 2 which remains perpendicular to the first axis and lies in the plane defined by the fixed direction of incident X-ray beam and the normal to the dominant crystal face, and about axis 3 which is perpendicular to axis 2 and is fixed in position with respect to the base of the goniometer the three axes meeting in a common point positioned so as to be included in the plane of the dominant crystal face throughout the operations of the goniometer. The carriage is adjustable between a first position in which the sample is held so that the plane of its dominant face is perpendicular to the first axis and therefore contains the second axis and a second position in which the plane of the dominant face contains the said first axis. Preferably as shown in Figs. 3 and 4 the carriage comprises a frame member e.g. for containing the crystalline sample framing its dominant face when the assembly is in use, and (Fig. 3) having a holder 9 formed with first and second slots 10 and 11 at right angles to each other and adapted to receive the edges of the frame 8 or (Fig. 4) a holder 12 on which a frame member 13 is pivotally mounted, the frame being fixable in two mutually perpendicular positions, the frame in either case being positioned to give the desired orientation of the dominant face. The crystalline sample in frame 8 for example may be formed by pressure compacting the sample material in mould such that pressure is applied to the sample from the side opposite the dominant plane face the edge regions of the sample slanting back from that face, the resultant compacted sample being pressed into the frame so that the plane face passes through the frame to an extent limited by the slanting edge regions. Preferably as shown in Fig. 1 the assembly is so arranged that a second rotary drive device is arranged to rotate the first rotary drive device and the support part around the second axis and the third rotary drive device is arranged to rotate the first and second drive devices and the crystal support around the third axis. The reciprocatory drive means may be controlled independently of the rotary drive means to vary the amplitude of reciprocation between zero and a maximum valve. The reciprocatory drive and the rotary drive means may be electric motors which may be connected to electrical supply means such that the motors may be operated by a remotely positioned control means. The control means may be programmed to be operated in accordance with a predetermined programme.