An Optical Projecting Encoder ("OPE") having an emitter module for
transmitting emitted optical radiation through a mask to a moving object,
and a detector module for receiving reflected optical radiation from the
moving object. The reflected optical radiation from the moving object may
include a predetermined image cast by the mask and a surface texture
image from the moving object. The OPE may include a transmissive layer
covering both the emitter module and the detector module, where the
transmissive layer covering the emitter module collimates the optical
radiation from the emitter module, and the transmissive layer covering
the detector module concentrates the optical radiation reflected from the
moving object to the detector module. The detector module may include an
optical navigation sensor that continuously acquires and compares
predetermined images cast by the mask and surface texture images from the
moving object.