Optical Component State Detection for Laser Safety
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Solution Overview
Problem
Face recognition systems using lasers for illumination can suffer from optical component damage, leading to inefficient energy usage and potential eye damage due to unscattered laser light, as the optical elements may break, causing the laser to continue operating without proper scattering.
Innovation Solution
A detection device with a light refraction structure and resistance detection circuit is integrated into the system, utilizing a transparent conductive layer and refraction layer to monitor the state of the optical components, switching off the laser source when damage is detected to prevent energy waste and eye harm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical element is disposed at the laser exit end to scatter the laser light, then the face image information can be captured, but the optical element may be damaged causing unscattered laser light to reach the human eye
Solution Approach 1:
A detection circuit is integrated into the optical element to detect damage before unscattered laser light can reach the human eye. The controller receives detection signals and preemptively stops the laser source, preventing the harmful effect from occurring
Solution Approach 2:
The detection circuit continuously monitors the optical element's integrity and provides real-time feedback to the controller. When damage is detected, the controller immediately stops the laser source, creating a closed-loop safety mechanism that prevents eye damage
2Productivity
If the laser source continues to operate when the optical component is damaged, then the system remains operational, but energy is wasted and eye damage can occur
Solution Approach 1:
The detection circuit provides continuous feedback on the optical element's condition. When damage is detected, the controller receives this feedback and automatically stops the laser source, preventing energy waste while maintaining system integrity
Solution Approach 2:
The system performs self-diagnosis through the integrated detection circuit that automatically identifies optical element damage and triggers the controller to stop the laser source, eliminating the need for external monitoring and preventing energy waste
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 solution effectively determines the state of the optical components, ensuring the laser source only operates when the system is functioning correctly, thereby conserving energy and preventing eye damage by switching off the laser when damage is detected.
Implementation Method 1
a light refraction structure (110) mounted in a light path of the light source (200), wherein the light refraction structure (110) includes a substrate (111), a conductive layer (112) and a refraction layer (113)
Implementation Method 2
a detection circuit (120) mounted on the base plate (300), wherein the detection circuit (120) is adapted to detect a resistance value of the conductive layer (112)
Data Source
AI summary
A detection device includes a light refraction structure and a resistance detection circuit. The light refraction structure includes a substrate, a conductive layer, and a refraction layer. The conductive layer and the refraction layer are formed on the substrate. The conductive layer includes a resistance. The resistance detection circuit is electrically coupled to the conductive layer and is adapted to detect the resistance of the conductive layer. The resistance detection circuit generates a detection signal according to a change in the resistance, and the detection signal represents a state of the refraction layer.