Patent ID: 7531775
Filing Date: 2009-05-12
Classification: G01J,G01S

Abstract:
1. A photometer that tracks a path of a moving light source with substantially no motion of the photometer components, the system comprising: a non-moving, truncated paraboloid of revolution having a paraboloid axis, a paraboloid focus and a light reflecting inner surface, to receive incident light that passes through and adjacent to the focus from a light source that moves on a continuous curve representing a known path of the light source, and to reflect a substantial portion of the incident light, with at most a single reflection, in a direction substantially parallel to the paraboloid axis; a light processing filter to receive, process and issue the reflected light as processed light; and an array of light receiving elements, at least one of which receives and measures an associated intensity of a portion of the processed light, located at a position that is spaced apart a positive distance from the focus.