| 摘要 |
<p>PROBLEM TO BE SOLVED: To prepare a composite record from a signal deliverable by a beam receiver by forming a reference object when a beam passes, and a subject when the beam passes from various different directions from at least a plurality of partial objects. SOLUTION: Signals formed by a beam receiver 3 when a beam passes a reference object 2 and a subject are supplied to an image forming device 4. This device 4 calculates the distances to the receiver 3 and to the subject, and incident angle and incident direction from the signal of the object 2 in relation to the image signal. The object 2 is formed of at least two partial objects 5, 6 and this object is arm-shaped and arranged in cross, or alternatively provided with at least two partial objects so that the arrangement structure are not linear. The partial objects have spherical or disc-like forms to form one geometric body. The partial objects are differed in beam absorptivity, and the incident direction can be precisely detected in particular.</p> |
