Arrangement for measuring a three-dimensional coordinates of models

摘要

1450838 Acoustic position finding HITACHI SHIPBUILDINGS & ENG CO Ltd 23 April 1974 [10 May 1973 (3) 12 June 1973] 17763/74 Heading G1G The three-dimensional co-ordinates of a point p(x,y,z) Fig. 3, in an article are determined by electrically determining the supersonic wave travel times with respect to three (or more) reference points a, b, c of known co-ordinates and converting the travel times to co-ordinate information with a computer system 1, 2, either a wave transmitter T being located at or adjacent point p and wave receivers being located at or adjacent points a, b and c (as illustrated) or vice versa, and the (or each) transmitter being constructed as shown in Fig. 5 in the form of a cranked bar 13 having a probe point F and supporting two wave sources d and e disposed at known distances along a straight line passing through point F. The construction of transmitter permits measurement of points which are difficult to gain access to directly or which are located so as to be screened by objects from a wave receiver position, Fig. 7, (not shown). The invention is described as having particular application for determining dimensions in a scale model of a marine engine room or a land building or structure Fig. 4, (not shown).