Laser Distance Imaging Validity Check Using Rising Waveforms
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Solution Overview
Problem
Existing distance measurement devices using laser resonators face challenges in accurately verifying the similarity of side-channel signals in noisy environments, requiring numerous measurements and signal processing to prevent erroneous results.
Innovation Solution
A semiconductor device with a photoelectric conversion element and control unit for validity determination processing, utilizing multiple charge accumulation units and different laser light waveforms to verify the authenticity of received light from a specific laser light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an enormous number of times of measurement and signal processing are performed to verify similarity in noisy environments, then measurement accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts the rising waveform characteristic of the laser light source as a unique identifier for validity verification. By focusing only on the rising waveform portion rather than processing the entire signal, the system achieves accurate verification without requiring an enormous number of measurements, thus resolving the contradiction between verification accuracy and processing time
Solution Approach 2:
The patent performs preliminary action by capturing and storing the rising waveform characteristic of the laser light source in advance. This pre-captured characteristic is then used for rapid comparison and verification against received signals, eliminating the need for extensive real-time processing while maintaining high verification accuracy
2Measurement precision
If multiple charge accumulation units are used to capture light receiving waveforms, then verification accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the photoelectric conversion function by providing multiple charge accumulation units (first and second charge accumulation units) that can independently capture different aspects of the light receiving waveform. This segmentation allows accurate waveform capture for validity verification while keeping each unit's structure relatively simple
Solution Approach 2:
The multiple charge accumulation units serve multiple functions: they capture light receiving waveforms, store them for later comparison, and enable both validity verification and distance measurement operations. This multi-functionality improves verification accuracy without proportionally increasing device complexity
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 the accuracy and speed of verifying the validity of laser light signals, reducing the likelihood of erroneous measurements by leveraging unique laser resonator characteristics and spatial relationships.
Implementation Method 1
an imaging unit including a photoelectric conversion element that receives reflected light of light emitted from a specific laser light source reflected by a subject and performs photoelectric conversion
Data Source
AI summary
An object is to effectively take measures against erroneous measurement of distance measurement information based on a laser light source. Therefore, a semiconductor device according to the present technology includes an imaging unit including a photoelectric conversion element that receives reflected light of light emitted from a specific laser light source reflected by a subject and performs photoelectric conversion and a control unit that executes validity determination processing for determining whether or not the light received by the photoelectric conversion element is the light emitted from the specific laser light source.