Optical systems with tiltable filters

Abstract

Imaging systems employing active illumination such as in-cabin monitoring or LiDAR systems may include a laser or LED source and an image sensor that is triggered by light reflecting off a target scene. The light has a spectral response that drifts as a function of temperature. To help compensate for such drifting in the spectral response of the light, a tiltable bandpass filter may be disposed over the image sensor. The bandpass filter is tilted or rotated using a filter tilting device. The filter tilting device may tilt or rotate the bandpass filter by an amount that causes a shift in the passband of the bandpass filter so that the shifted passband is aligned with the spectral response of the laser light across different ambient temperatures. Aligning the filter passband to the peak spectral response of the light source can help improve rejection of unwanted illumination from extraneous light sources.

Dependencies are inferred from the claim text.