Lidar Detector With Dual-Surface Differential Signal Processing
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Solution Overview
Problem
Existing LIDAR detectors face challenges in effectively differential detection of frequency modulated continuous wave (FMCW) lidar signals, particularly in achieving high signal-to-noise ratio and simplifying the detector design.
Innovation Solution
The detector incorporates a substrate with integrated electronic circuits and includes two detector elements with active semiconductor layers arranged laterally on the substrate. These detector elements are configured to convert electromagnetic radiation into electrical signals, with a specific arrangement to form a standing electromagnetic wave, allowing for differential detection of the difference frequency between the transmission and receiving signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional LIDAR detectors are used for differential detection of FMCW lidar signals, then the detector design becomes complex requiring optical circulators and separate transmit/receive paths, but the device complexity increases and cost rises
Solution Approach 1:
The patent merges the transmit and receive optical paths into a single detector structure. The detector element has a first main surface for coupling in the transmit signal and a second main surface for coupling in the receive signal, allowing both signals to be detected simultaneously without requiring separate optical circulators or complex routing mechanisms.
Solution Approach 2:
The detector element is designed to perform multiple functions: it detects both the transmit signal and the receive signal through its two main surfaces, and it simultaneously forms a standing electromagnetic wave for differential detection. This multi-functional design eliminates the need for separate dedicated components for each function.
2Reliability
If separate transmit and receive optical paths are used, then signal detection is possible, but the number of optical components increases and the overall system size grows
Solution Approach 1:
The patent combines the transmit and receive signal detection into a single detector element. The first main surface receives the transmit signal while the second main surface receives the reflectively returned signal, merging what would traditionally require separate detection paths into one integrated component.
3Ease of manufacture
If conventional detector designs are used, then manufacturing is straightforward, but the signal-to-noise ratio is insufficient for effective differential detection
Solution Approach 1:
The patent introduces a dynamic standing electromagnetic wave formation within the detector element by superimposing the transmit and receive signals. This dynamic interference pattern creates regions of constructive and destructive interference that enhance the differential detection capability and improve the signal-to-noise ratio compared to static detection methods.
Solution Approach 2:
The patent changes the detection parameter from simple intensity measurement to differential detection based on standing wave interference patterns. By measuring the difference in signals from the two main surfaces and processing this differential information, the system achieves superior signal-to-noise ratio while maintaining manufacturing feasibility.
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
This configuration enhances the signal-to-noise ratio by eliminating unwanted constant components of the standing electromagnetic wave and allows for compact, cost-effective integration of the detector, simplifying the design by eliminating the need for optical circulators.
Implementation Method 1
each of the detector elements includes an active semiconductor layer configured for converting electromagnetic radiation having a wavelength λ into an electrical signal
Implementation Method 2
the transmission signal and the receiving signal are superimposed in counter-propagating directions in the first detector element and in the second detector element
Data Source
AI summary
A detector is provided which includes at least the following features:a substrate; andat least a first detector element and a second detector element, which are arranged laterally next to one another on a main surface of the substrate, whereineach of the detector elements includes an active semiconductor layer configured for converting electromagnetic radiation having a wavelength λ into an electrical signal,each of the detector elements includes a first main surface and a second main surface opposite the first main surface, andthe first main surface and the second main surface are each configured for coupling in and for coupling out electromagnetic radiation of wavelength λ.Furthermore, a lidar module and a method for operating a lidar module are specified.