Systems and Methods for Lensed and Lensless Optical Sensing

摘要

A sensing device with an odd-symmetry grating projects near-field spatial modulations onto an array of closely spaced pixels. 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. Pixels responsive to infrared light can be used to make thermal imaging devices and other types of thermal sensors. Some sensors are well adapted for tracking eye movements, and others for imaging barcodes and like binary images. In the latter case, the known binary property of the expected images can be used to simplify the process of extracting image data.

主权项

1. A system for tracking movement of an eye, the system comprising:
an array of photoelements; a grating to collect light reflected from the eye, the grating having a point spread function that focuses light from a point-source to a pattern spatially distributed across non-adjacent ones of the photoelements; and a processor coupled to the array of photoelements to compute a location of the point source from features of the pattern.