8.3
Boreal Laser Inc.
GasFinderMC Installation Manual — Tutorial
July 17th 2017
Retrorefl ectors (Retros)
The laser beam is transmitted to a retro made with a special type of corner cube arrangement.
This causes the signal to be refl ected directly back to the detector in the transmitter enclosure.
With the appropriate number of retros, path lengths up to 750m can be traversed.
Most mirrors refl ect light the same way as a fl at, glass
bathroom mirror, where the angle of incidence(i) =
the angle of refl ection(r). A bathroom mirror has the
refl ective coating on the rear, behind the glass. See
fi gure 4.
A retro is different in that the refl ected light returns
in the same direction as the incident light. The beam
is refl ected 180 degrees. A retro is like a section
through a corner and has three faces that form the
inside corner of a cube. Some highway refl ectors
are everyday examples. See fi gure 5.
Because retros used for laser gas detection
have the refl ective surface on the front, the base
material can be glass or metal. The surface coating
is usually a very thin layer of gold or sometimes
silver. This means that cleaning the fragile coating
is very diffi cult and is done with an air brush to avoid
touching the surface.
75 Element
Retro
6 Retros
Remote Head
Fig. 4 Flat Mirror
Fig. 5 Retrorefl ector
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