Optical Sensor Light Output Control for Heat-Stable Detection
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Solution Overview
Problem
Optical sensors face durability issues due to increased temperature of the light source element, leading to a decrease in the sensor's lifespan.
Innovation Solution
An optical sensor with a control unit that monitors heat transfer temperature and adjusts the luminous output of the light source element to absorb temperature changes, maintaining the junction temperature within an allowable range and ensuring durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the luminous output at the light source element is increased to improve detection sensitivity, then the detection capability is improved, but the junction temperature increases and the lifespan of the light source element decreases
Solution Approach 1:
The control unit continuously monitors the heat transfer temperature and adjusts the luminous output accordingly. When the heat transfer temperature exceeds a predetermined threshold, the control unit reduces the luminous output to prevent excessive temperature rise, thereby protecting the light source element while maintaining optimal detection performance within safe temperature limits.
Solution Approach 2:
The system dynamically changes the luminous output parameter based on the heat transfer temperature. By adjusting the luminous output in response to temperature conditions, the system optimizes the balance between detection sensitivity and light source element lifespan, ensuring high performance when temperatures are acceptable and protection when temperatures approach critical levels.
2Measurement precision
If the luminous output is continuously high to maintain detection accuracy, then the detection accuracy is maintained, but the heat transfer temperature increases and causes efficiency degradation
Solution Approach 1:
The control unit uses feedback from temperature monitoring to adjust the luminous output. When heat transfer temperature rises and causes efficiency degradation, the system reduces luminous output to stabilize temperature, preventing further efficiency loss and maintaining reliable operation over time.
Solution Approach 2:
The system proactively reduces luminous output when heat transfer temperature approaches levels that cause efficiency degradation. This preventive approach cushions against temperature-related efficiency loss by adjusting output before critical temperature thresholds are reached, ensuring stable luminous efficiency and reliable detection accuracy.
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 suppresses the decrease in the light source element's life by controlling temperature changes, enhancing durability and ensuring the accuracy and safety of the detection signal.
Implementation Method 1
a light projector unit that generates a projected light beam by a light source element
Implementation Method 2
a light receiver unit that outputs a detection signal by receiving the reflected beam
Data Source
AI summary
An optical sensor comprises a light projector unit that generates a projected light beam by a light source element, a light receiver unit that outputs a detection signal by receiving a reflected beam, and a control unit that controls the light projector unit and the light receiver unit. A control unit is configured to perform: monitoring a heat transfer temperature Tt transferred to a surroundings of a light source element in a light projector unit; and controlling a luminous output PI at the light source element so as to absorb a temperature change amount in a junction temperature Tj at the light source element, which is correlated with an efficiency change amount of a luminous efficiency that decreases as the heat transfer temperature Tt increases at the light source element and a heat transfer change amount in the heat transfer temperature Tt.