Mobile Robot Surface Detection Using Adaptive Light Intensity Control
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Solution Overview
Problem
Traditional ground detection systems and wall surface detection systems in mobile robots fail to operate effectively in environments with strong light or black light-absorbing surfaces, leading to misjudgments and unexpected actions.
Innovation Solution
A mobile robot equipped with a light emitter, photoelectric sensor, and a variable impedance unit, where the light emitter can adjust its intensity to form different operating states, and a control unit adjusts the light emitter's state based on sampling differences to prevent misjudgments, allowing the robot to operate in environments with strong light or black surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the infrared emission tube is turned on to emit infrared light for ground detection, then the detection function works normally, but in strong light environments the infrared receiving tube becomes saturated and causes misjudgment
Solution Approach 1:
The patent applies dynamics by making the light emitter's intensity adjustable rather than fixed. The control unit dynamically adjusts the light emitter between at least two different intensity levels based on real-time detection of the infrared receiving tube's signal state, allowing the system to adapt to varying ambient light conditions and prevent saturation
Solution Approach 2:
The patent changes the intensity parameter of the light emitter to resolve the contradiction. By adjusting the light emitter's intensity to different levels, the system can maintain reliable detection in strong light environments while avoiding the saturation problem that occurs with fixed intensity emission
2Reliability
If the infrared emission tube emits infrared light continuously, then detection is always active, but on black light-absorbing surfaces the infrared light is absorbed and no significant signal change occurs causing misjudgment
Solution Approach 1:
The system dynamically adjusts the light emitter's intensity based on the detected signal characteristics. When operating on black light-absorbing surfaces, the control unit increases the light emitter's intensity to ensure sufficient reflected light reaches the infrared receiving tube, maintaining reliable detection
Solution Approach 2:
The patent changes the intensity parameter of the light emitter to compensate for light absorption by black surfaces. By adjusting the emission intensity upward, the system ensures that enough reflected light reaches the sensor to generate a detectable signal change, resolving the measurement precision issue
3Measurement precision
If the infrared receiving tube has high sensitivity to detect subtle surface changes, then detection accuracy improves, but it becomes easily saturated in strong light environments
Solution Approach 1:
The patent changes the intensity parameter of the light emitter to match the sensitivity characteristics of the infrared receiving tube. By adjusting the emission intensity downward in strong light conditions, the system prevents the high-sensitivity receiver from becoming saturated while maintaining sufficient signal strength for accurate detection
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 the mobile robot to accurately detect surfaces and prevent unexpected actions in environments with strong light or black surfaces, ensuring proper operation and functionality.
Implementation Method 1
a light emitter for emitting light toward a surface to be detected, a photoelectric sensor responsive to light from an environment and/or emitted by the light emitter
Data Source
AI summary
A mobile robot, comprising: a body and a drive system for driving a movement of the mobile robot, a light emitter for emitting light toward a surface to be detected, a photoelectric sensor responsive to light from an environment and/or emitted by the light emitter, a variable impedance unit connected to the photoelectric sensor and having a reduced impedance when the photoelectric sensor is responsive to light of a preset intensity, and a control unit, where the light emitter is controlled by the control unit to form at least two operating states in which light is emitted at different intensities, and in the operating state other than the last operating state, if a sampling difference value determined when the light emitter is in the OFF state and ON state does not satisfy a preset condition, an operating state of the light emitter is changed to prevent misjudgment.