Phase Gratings with Odd Symmetry for Lensed Optical Sensing

摘要

A sensing device with an odd-symmetry grating projects near-field spatial modulations onto a closely spaced photodetector array. Due to physical properties of the grating, the spatial modulations are in focus for a range of wavelengths and spacings. The spatial modulations are captured by the array, and photographs and other image information can be extracted from the resultant data. Used in conjunction with a converging optical element, versions of these gratings provide depth information about objects in an imaged scene. This depth information can be computationally extracted to obtain a depth map of the scene.

主权项

1. A camera comprising:
an optical element operable to converge incident light from a point source; a photodetector array spaced from the optical element and defining a focal plane in a path of the converged incident light; and a phase grating disposed in the path between the optical element and the photodetector array, the phase grating operable to induce near-field spatial modulations illuminating a pattern area at the photodetector array.