F5 3D Imaging System User Manual
30
IR Absorbers or High Reflectors:
Some materials absorb infrared light
from almost any angle and thereby resist sampling. Furthermore, scenes
containing intermingled IR-reflecting and non-reflecting objects are a
challenge to the camera’s gain adjustment mechanism (AGC) and may
decrease image quality. If many of the images are over-exposed on the
screen (for example, with whiteouts), try increasing the Imager’s distance
from the object and take several separate shots of the scene using
different paths around the object.
Transparency:
The system can capture objects through glass windows,
but cannot capture transparent or translucent objects (for example,
bottles, windows and so on). However, some transparent materials reflect
IR light at certain angles, and may yield some limited results.
Lighting Conditions
The system can operate under any lighting condition, including direct sunlight,
but works best in darkness or low-light conditions. Performance is decreased
in direct sunlight.
Therefore, the maximum recording distance is limited for objects with lower
IR reflectivity. This is due to competing ambient IR light sources. The sun
produces large amounts of the projector’s wavelength used by the system.
Thus, some lighting fixtures also interfere with the system results on some
level.
NOTE
Light that emits heat usually produces large amounts of IR energy. Fluorescent bulbs
and CFLs are cold, and therefore produce much lower levels of IR.
