| 摘要 |
<p>The apparatus according to the invention, which serves to control the interior of a cavity (10), comprises an optical system formed by lenses (3, 4, 5, 71, 72) and before which a reflector (2) is interposed, the assembly being mounted in a mounting. The apparatus is essentially characterised by the fact that the reflector (2) comprises two reflecting plane faces (21, 22) which are inclined to the optical axis (11) and which make it possible to reflect the light beams emanating from two opposing sectors of the cavity in order to form, via the optical lens system, rectilinear images on at least one light detector (81, 82), means (9) being provided for relative displacement, by translation and by rotation, of the apparatus in relation to the said chamber (10). <IMAGE></p> |
