Channel-specific micro-optics for optical arrays
A multispectral sensor array can include a combination of ranging sensor channels (e.g., LIDAR sensor channels) and ambient-light sensor channels tuned to detect ambient light having a channel-specific property (e.g., color). The sensor channels can be arranged and spaced to provide multispectral images of a field of view in which the multispectral images from different sensors are inherently aligned with each other to define an array of multispectral image pixels. Various optical elements can be provided to facilitate imaging operations. Light ranging/imaging systems incorporating multispectral sensor arrays can operate in rotating and/or static modes.
1. A LIDAR transmitter device comprising:
an emitter array having a plurality of emitter channels arranged to emit light through a corresponding plurality of apertures in an aperture plane;
a bulk optic module disposed in front of the emitter array and configured to direct light from the aperture plane into a field of view; and
a plurality of channel-specific micro-optic elements, each channel-specific micro-optic element being disposed in front of a different one of the apertures and having an optical prescription that is different for different channel-specific micro-optic elements.
2. The LIDAR transmitter device of claim 1 wherein the optical prescription for a particular one of the channel-specific micro-optic elements is based at least in part on an optical property of the bulk optic module.
3. The LIDAR transmitter device of claim 1 wherein the bulk optic module has a curved focal plane and wherein the optical prescription of each of the channel-specific micro-optic elements compensates for an offset between a location of the aperture and a corresponding location on the curved focal plane.
4. The LIDAR transmitter device of claim 1 wherein the optical prescription of each channel-specific micro-optic element is a function of a radial distance in the aperture plane from an optical axis of the bulk optic module to the corresponding aperture.
5. The LIDAR transmitter device of claim 1 wherein the channel-specific micro-optic elements disposed in front of different apertures have optical prescriptions with different focusing powers.
6. The LIDAR transmitter device of claim 1 wherein the channel-specific micro-optic elements disposed in front of different channels have different standoff distances from the aperture plane.