Hands On Physics
Measurements taken with a Sun Photometer since 1960 show the results of
Mount Pinatubo's erruption.
Every TERC VHS-1 has its own distinctive ET constant. This calibration number
permits you to determine what scientists call the Aerosol Optical Thickness
(AOT) of the atmosphere. AOT provides an excellent haze index. Even though
the ET constant of different instruments may vary, all instruments should
give very similar AOTs.
The AOT formula is incorporated into the TERC VHS-1 spreadsheet which can
be downloaded from: ftp://concord.org/pub/haze/vhs1-download/
The modern era of Sun photometry began with the development of hand-held
instruments by Frederick E. Volz, and continues with your work. Some important
books and journal articles about haze are referenced here.
Beer's Law is a mathematical model which can be used to describe light transmission
through increasing thickness of air.
Definitions and explainations of some of the terms used in this unit
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