Waveguide Heating Layout for Precise LiDAR Phase Modulation
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Solution Overview
Problem
Current LIDAR technologies face challenges in achieving high accuracy for range and velocity measurements, which is crucial for autonomous vehicle navigation.
Innovation Solution
A LIDAR device is designed with a substrate layer, a cladding layer, a waveguide, and an ohmic element, where the ohmic element imparts heat to the waveguide to modulate the phase of infrared light, enhancing thermal control and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal control is increased to improve measurement accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent combines the thermal management function with the existing waveguide structure by integrating heating elements directly into the waveguide assembly. This merging approach allows thermal control to be achieved without adding separate, complex thermal management subsystems, thereby improving measurement accuracy while minimizing increases in device complexity.
Solution Approach 2:
The patent introduces thermal management components as intermediaries between the light source and the detection system. These intermediary elements (heating elements, thermal control mechanisms) enable precise temperature control of the waveguide, which in turn improves the accuracy of range and velocity measurements without requiring direct modification of the core measurement system.
2Measurement precision
If phase modulation is achieved through thermal control, then measurement accuracy improves, but energy consumption increases
Solution Approach 1:
The patent implements phase modulation through periodic or pulsed application of electrical current to the ohmic element rather than continuous heating. This periodic action achieves the necessary phase modulation for accurate measurements while significantly reducing overall energy consumption compared to continuous thermal control, as heating is applied only when phase modulation is required.
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
The thermal management system in the LIDAR device allows for precise control of the waveguide's temperature, improving the accuracy of range and velocity measurements, which is essential for reliable autonomous vehicle operation.
Implementation Method 1
The ohmic element is arranged to impart heat to the waveguide in response to an electrical current that is provided to the ohmic element
Implementation Method 2
a heat module configured to modulate a phase of light propagating through the waveguide by modulating the electrical current provided to the ohmic element
Data Source
AI summary
A light detection and ranging (LIDAR) device includes a substrate layer, a cladding layer, a waveguide, and an ohmic element. The cladding layer is disposed with the substrate layer. The waveguide runs through the cladding layer. The ohmic element runs through the cladding layer. The ohmic element is arranged to impart heat to the waveguide when an electrical current is driven through the ohmic element.