Optical encoders and detector systems for detecting wavelength and/or position of a moveable light source, and related methods

Abstract

An optical encoder and detector system is disclosed, comprising a lateral photodiode configured to receive monochromatic light and a linear variable optical filter positioned in the optical path between the light source and the photodiode. The system enables precise detection of the optical wavelength of the incident light, with embodiments utilizing multi-lane lateral photodiodes to improve wavelength resolution and detection speed. The encoder may include a cooling element, such as a thermoelectric cooler, to reduce noise and enhance measurement accuracy. Additional embodiments provide reference diodes for further accuracy and support both front side and backside illumination. The system can also detect the position, including angular position, of a moveable light source using current differences between anodes of the photodiode. These features allow for high-resolution, high-bandwidth, and robust optical wavelength and position detection across a range of applications.

Dependencies are inferred from the claim text.