Abstract: A method and apparatus for measuring the relative positions of first and second components, comprising: mounting first and second measurement units on respective housings forming part of each component and which are rotatably arranged and infinitely adjustable thereon in respective brackets for defining first and second adjustably selected rotational axes, respectively; measuring the relative positions of the components in first and second states of operation by detecting the relative positions of those selected axes in each state of operation and producing measurement values determinative of those relative positions.

Abstract: The invention relates to a device for alignment of a first component (1; 25) and a second component (2; 26) in a predetermined relation to each other, comprising first measuring unit (7; 7?; 7?) arranged to be mounted on said first component (1; 25) and comprising a light-source (9) for generation of light-radiation (10; 10?) with a predetermined pattern in direction towards a second measuring unit (11; 11?) arranged to be mounted on said second component (2; 26) and also comprising a second light-source for generation of light radiation (13; 13?) with a predetermined pattern in direction towards said first measuring unit (7; 7?; 7?), were each of the measuring units (7, 11; 7?; 7?, 11?) comprises a detection device for emitted light radiation. The invention is characterized in that each of the measuring units (7, 11; 7?; 7?, 11?) comprises at least one reference component (18a, 18b, 19a, 19b) which during said alignment is connected with a predetermined position on respective component (1, 2; 26, 26).

Abstract: The invention relates to a device for alignment of a first component (1) and a second component (2) in a predetermined relation to each other, comprising a transmitter unit (7) arranged for mounting on said first component (1) and comprising a light source (9) for the generation of light radiation (10) with a predetermined pattern in the direction towards a receiver unit (11; 11?, 22, 27; 27?) arranged for mounting on said second component (2), where the receiver unit (11; 11?) comprises a detection device (18a, 18b; 18a?, 18b? 23a, 23b; 28a, 28b; 28?a, 28?b) for said light radiation (10). The invention is characterised in that said detector device (18a, 18b; 18a?, 18b?, 23a, 23b; 28a, 28b, 28?a, 28?b) comprises a first detector (18a, 18a? 23a; 28a; 28a?) and a second detector (18b; 18b? 23b; 28b; 28?b), respectively, which are separated depthwise in relation to said transmitter unit (7).