Laser Safety Comparator for LIDAR Voltage Monitoring
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Solution Overview
Problem
Conventional laser driver circuits lack effective mechanisms to ensure compliance with laser safety thresholds during the emission of light pulses, particularly in LIDAR systems, which can lead to unsafe operating conditions.
Innovation Solution
A system comprising a laser pulser circuit with a capacitive element, a field effect transistor (FET), and a sensing circuit that includes a comparator and controller to compare operating and reference voltages, evaluating compliance with laser safety thresholds and adjusting the reference voltage to prevent excessive energy emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser driver circuits are used to provide signals to laser light-emitting devices, then the laser system can emit constant or pulsed laser light, but the system lacks effective mechanisms to ensure compliance with laser safety thresholds
Solution Approach 1:
The patent implements preliminary safety verification by comparing the voltage across the capacitive element against a predetermined safety threshold voltage before allowing the laser pulser circuit to discharge and emit light pulses. This pre-check prevents unsafe operation by ensuring the stored energy will not exceed safety limits, thereby improving reliability without requiring complex real-time monitoring during the actual laser emission.
Solution Approach 2:
The patent introduces a sensing circuit with a comparator as an intermediary component between the laser pulser circuit and the control system. The comparator acts as a mediator that compares the operating voltage with the reference safety threshold and generates an interlock signal, providing a clear safety indication without requiring complex analysis of the laser emission process itself.
2Use of energy by moving object
If the capacitive element is charged to higher voltages to increase laser pulse energy, then the laser emission intensity increases, but the risk of exceeding safety thresholds increases
Solution Approach 1:
The patent applies preliminary anti-action by establishing a predetermined safety threshold voltage that represents the maximum safe energy level. Before the capacitive element is fully charged or discharged, the sensing circuit compares its voltage against this threshold and generates an interlock signal that prevents operation if the threshold would be exceeded. This proactively counteracts the potential harmful effect of excessive energy emission before it can occur.
Solution Approach 2:
The patent implements a feedback mechanism where the sensing circuit continuously monitors the voltage across the capacitive element and provides real-time information to the controller through the comparator output. This feedback loop allows the system to adjust or prevent operation based on the actual energy level, ensuring that laser pulse energy remains within safe limits while maximizing usable energy output.
3Reliability
If real-time monitoring of capacitive element charge is implemented, then laser safety compliance can be ensured, but the device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential safety verification function from a complex monitoring system. Instead of implementing comprehensive real-time monitoring of all circuit parameters, the sensing circuit is designed to specifically monitor only the voltage across the capacitive element, which is the critical parameter for determining safety compliance. This extraction of the essential function reduces complexity while maintaining effective safety assurance.
Solution Approach 2:
The patent changes the monitoring parameter from complex multi-parameter real-time monitoring to a simple voltage threshold comparison. By focusing on a single critical parameter (capacitive element voltage) and comparing it against a predetermined threshold, the system achieves reliable safety compliance verification with minimal circuit complexity, avoiding the need for sophisticated sensors or control algorithms.
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
Ensures reliable and safe operation of LIDAR systems by preventing excessive energy emission, detecting potential malfunctions, and maintaining compliance with laser safety standards through real-time voltage monitoring and control.
Implementation Method 1
The laser pulser circuit includes a capacitive element
Implementation Method 2
at least one field effect transistor (FET)
Data Source
AI summary
The present disclosure relates to systems and methods that facilitate compliance of a laser device with a laser safety threshold. An example method includes receiving, from a sensing circuit, an operating voltage that is indicative of a charge of a capacitive element of a laser pulser circuit. The method also includes comparing a first voltage indicative of the operating voltage and a second voltage indicative of a reference voltage. The method additionally includes providing an output value based on the comparing. The method yet further includes evaluating compliance with the laser safety threshold based on the output value.