Co-Aligned LiDAR Waveguide Optics for Low-Interference Detection
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Solution Overview
Problem
Light detectors, such as silicon photomultipliers, are sensitive to low light intensities but also susceptible to adverse background effects from extraneous light sources, leading to measurement inaccuracies.
Innovation Solution
A system with a waveguide and mirror configuration that aligns transmit and receive paths, using a lens to focus light through an aperture defined by an opaque material, reducing optical distortions like parallax and background interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light detectors are arranged as an array to detect light over a large geometric area, then the detection area is increased, but the susceptibility to adverse background effects from extraneous light sources increases
Solution Approach 1:
The detection array is segmented into multiple independently controllable detector elements, allowing selective activation and individual calibration. This segmentation enables the system to optimize the active detection area dynamically, reducing exposure to background light while maintaining large geometric coverage when needed.
Solution Approach 2:
Different regions of the detector array are assigned different operational characteristics or activation states based on local background light conditions. Areas with high background interference can be deactivated or operated in a different mode, while regions with favorable conditions maintain full sensitivity, thus optimizing the overall signal-to-noise ratio across the large detection area.
2Measurement precision
If light detectors are made sensitive to low light intensities to enhance detection qualities, then the detection sensitivity is improved, but the susceptibility to adverse background effects increases
Solution Approach 1:
The light detectors operate in periodic pulse modes rather than continuous detection. By activating detectors in synchronized pulses and measuring returns within specific time windows, the system maintains high sensitivity to weak signals while ignoring continuous background light, effectively separating signal detection from background interference through temporal gating.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor background light levels and dynamically adjust detector sensitivity, gain settings, or activation thresholds. This feedback loop allows the detectors to maintain optimal sensitivity to low-intensity signals while automatically compensating for varying background light conditions, preventing saturation from extraneous light sources.
3Measurement precision
If a waveguide and mirror configuration is used to align transmit and receive paths, then optical distortions like parallax are reduced, but the device complexity increases
Solution Approach 1:
The transmit and receive optical paths are merged into a single shared path using the waveguide structure. By combining both functions through one optical route, the system eliminates the need for separate transmit and receive optics, reducing the number of alignment-critical components while maintaining precise co-alignment through the integrated waveguide architecture.
Solution Approach 2:
The waveguide acts as an intermediary optical element that couples the light source and detectors while maintaining precise spatial relationships. This intermediary structure provides mechanical stability and optical precision without requiring complex external alignment mechanisms, as the waveguide itself defines the optical path geometry through its physical structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances measurement accuracy by minimizing background light interference and reducing optical distortions, allowing for precise detection of scene reflections.
Implementation Method 1
The waveguide guides the emitted light from the input end to the output end
Implementation Method 2
The lens focuses light from the scene toward the waveguide and the light detector
Implementation Method 3
The mirror reflects the guided light toward the third side of the waveguide
Data Source
AI summary
One example system includes a light source that emits light. The system also includes a waveguide that guides the emitted light from a first side of the waveguide toward a second side of the waveguide opposite the first side. The waveguide has a third side extending between the first side and the second side. The system also includes a mirror that reflects the guided light toward the third side of the waveguide. At least a portion of the reflected light propagates out of the waveguide toward a scene. The system also includes a light detector, and a lens that focuses light from the scene toward the waveguide and the light detector.