The wavelength selection consists on a structure formed by a hollow tubular shaft where four filter wheels are mounted. These wheels can rotate around the shaft and can be positioned independently by the user to select the appropiate filter to be used. Each wheel is driven by a motor via a geared transmission and a timing belt. An incremental encoder situated on the motor axis allows to identify the optical element positioned in the optical beam the mechanical interface with the support structure.
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Last update August 8, 2005, by Héctor Castañeda