Laser Radar Circuit Failure Detection via Reference Waveform Comparison
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Solution Overview
Problem
Laser radar devices face challenges in quickly detecting circuit failures due to changes in temperature and waveforms, which can lead to delayed detection of intruders, as existing methods require setting high thresholds to avoid false failures.
Innovation Solution
A laser radar device that projects a laser beam to both a detection area and a reference optical member, with a detection unit that calculates the degree of changes in the reference received light waveforms over time to determine circuit failures, allowing for early detection of faults before significant waveform changes occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high threshold is set for wave height to avoid misjudging temperature changes as failures, then false failure detection is reduced, but the detection speed of actual failures is delayed
Solution Approach 1:
The patent performs preliminary calibration by measuring the reference optical member at multiple time points (first time and second time) to establish baseline waveform characteristics before actual failure detection is needed. This preliminary action allows the system to anticipate normal variations and set appropriate thresholds dynamically, resolving the contradiction between avoiding false positives and detecting failures quickly.
Solution Approach 2:
The patent implements feedback by continuously monitoring the reference optical member waveform and comparing it against calibrated baseline values. The system uses the feedback from repeated measurements to dynamically adjust detection thresholds and identify deviations that indicate actual failures, thereby reducing both false positives and detection delays.
2Measurement precision
If the reference length is calibrated based on temperature changes, then distance measurement accuracy is maintained, but the system cannot quickly detect circuit failures
Solution Approach 1:
The patent performs preliminary calibration measurements at multiple time points to establish baseline reference waveforms before failure detection is needed. This preliminary action creates a reference framework that allows rapid comparison and detection of deviations indicating circuit failures, while maintaining distance measurement accuracy through continuous calibration.
Solution Approach 2:
The patent makes the reference optical member measurement system serve multiple functions: it maintains distance measurement calibration accuracy while simultaneously providing a rapid failure detection mechanism. By using the same reference measurement infrastructure for both calibration and failure detection, the system achieves multi-functionality that resolves the contradiction between precision and productivity.
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
Enables rapid detection of circuit failures, preventing intruders from remaining undetected in the danger zone, thereby enhancing the security system's response time and accuracy.
Implementation Method 1
a light projector that projects a laser beam
Implementation Method 2
a light receiver that receives a reflected light of the laser beam
Implementation Method 3
a light receiver that receives a reflected light of the laser beam projected from the light projector, converts the reflected light to, as an electric signal, a received light waveform
Data Source
AI summary
In a laser radar device, a light projector projects a laser beam to both a detection area outside the device and a reference optical member located inside the device. A light receiver receives a reflected light of the laser beam, converts the reflected light to an electrical received light waveform. A detection unit detects an object in the detection area based on the received light waveform. A determination unit obtains an electrical reference received light waveform from the light receiver by making the light projector project the laser beam to the reference optical member, at a first time and a second time elapsing from the first time. The determination unit further calculates a degree of changes between the reference received light waveforms acquired at the first and second times, and determines whether there is caused a failure in circuitry, based on the degree of changes.