Patent ID: 8492696

Claim:
Mapping apparatus, comprising: a projection subassembly, comprising: a device package; a radiation source, contained in the package and configured to emit a beam of coherent radiation; a diffractive optical element (DOE), mounted in the package so as to receive and diffract the radiation from the radiation source into a predefined pattern comprising multiple diffraction orders; and an optical detector, which is positioned in the package so as to receive a selected diffraction order of the DOE and to output a signal that is response to an intensity of the selected diffraction order; an imaging subassembly, which is configured to capture an image of the pattern that is projected onto an object; and processing circuitry, which is configured to process the image in order to produce a three-dimensional (3D) map of the object, and to process the signal in order to monitor a performance of the DOE.