Patent ID: 6191413
Filing Date: 2001-02-20
Classification: G01J,G02B

Abstract:
An arrangement for dectecting an ambient electromagnetic energy, the arrangement comprising:a photodetector having a photodetector input for receiving electromagnetic energy, and a photodectector output for producing an electrical characteristic responsive to the electromagnetic energy; anda hollow conduit having a lumen, a first end that is open to the lumen and arranged to receive a received portion of the ambient electromagnetic energy, and a second end that is open to the lumen and arranged in the vicinity of the photodetector input, said hollow conduit having a polished interior surface, and length and radius dimensional characteristic that are predetermined to effect a desired combination of a first portion of the received portion of the electromagnetic energy that impinges upon an interior surface of said hollow conduit, and a second portion of the received portion of the electromagnetic energy that propagates directly through the lumen of said hollow conduit, whereby a portion of the received potion of the ambient electromagnetic energy impinges upon the photodetector input, the first end that is open to the lumen being configured to effect a predetermined directional sensitivity to the arrangement corresponding to a predetermined combination of the first and second portions of the received portion of the electromagnetic energy.