The United States of America As Represented by the Administrator of the U.S. Environmental Protection Agency

William A Mitchell

Eben Daniel Thoma

William C Squier

Cary Doman Secrest

Disclosed is an open-path optical sensor. Typically, the optical sensor directs UV radiation from a source assembly to a detector assembly along a monitoring path. The source assembly emits UV radiation corresponding to a signal channel and to a reference channel. The detector assembly detects UV radiation corresponding to the signal channel and to the reference channel. The detector assembly is in communication with a data acquisition system, which compares the intensity of the detected UV radiation corresponding to the signal channel to the intensity of the UV radiation corresponding to the reference channel.

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New Hill, NC, United States of America

William A Mitchell