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
