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7
Impacts due to
refraction
91
Refraction
Refraction happens when layers of air with varying degrees of temperature
•
and humidity deflect light as it passes through it.
Layers of air in a sewer pipe can refract a laser beam, causing it to bend
•
downward or produce a "dancing" effect as the beam passes through to the
target.
Refraction is especially noticeable during hot or humid weather, but may
•
also occur in extrremely cold conditions when warm air from a newly
opened trench mixes with the colder air.
In these conditions, Leica Geosystems strongly recommends the use of a
•
blower assembly to reduce or eliminnate the effects of refraction. A blower
mixes the different layers of air temperature and density inside a sewer
pipe, thereby creating a uniform medium for the laser beam to pass
through.
Refraction
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