Optec, Inc.
Optec has manufactured the LPV transmissometer and the NGN nephelometer for
over 20 years. These instruments are used worldwide for the accurate measurement
of atmospheric visibility in pristine and urban environoments.
LPV-2 transmissometer receiver with aluminum pier, adjustable base and large
telescope
NGN-2 ambient air nephelometer with inlet open
The subject of visibility is well documentated in the literature over the last
several decades. An excellent introduction to the subject of visibility can
be found with the link below. Written by Dr. William Malm of the National Park
Service, Introduction to Visibility explores all aspects
of the subject in a well written and generously illustrated e-book.
For
those new to this subject, it is recommended that you review this document before
examining our visibility measuring instruments in detail.
A pictorial guide to visibility starting from the fundamental principles for
visibility impairment and causes of regional haze to aerosol concentration and
trends. Many of the concepts are dynamically illustrated using animated figures.
Wyoming Visibility Monitoring Network
Optec, Inc. Instrument Test Area
Price List
Visibility Introduction
