Patent ID: 8299433
Filing Date: 2012-10-30
Classification: G01N

Abstract:
1. An apparatus comprising: a field reflector having an optical axis and a reflective surface; a plurality of pairs of object reflectors each of which has a reflective surface arranged to face the reflective surface of the field reflector; and a plurality of source port and detector port pairs facing the reflective surfaces of the object reflectors, the source port and detector port of each pair being positioned proximate an outer edge of the field reflector such that the optical axis of the field reflector lies between the respective source port and detector port, wherein each source port is configured to pass a beam of radiation to propagation between the field reflector and object reflectors, and each detector port is configured to receive a beam of radiation propagating between the field reflector and object reflectors, wherein the object reflectors and source port and detector port pairs are arranged such that each source port and detector port pair is associated with a respective pair of object reflectors forming a distinct channel, and wherein the source port and detector port pair, and centers of the associated pair of object reflectors, of each channel lie in a distinct plane.