Distance Measurement System with Dynamic Exposure Control
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Solution Overview
Problem
Existing distance measurement devices lack the ability to automatically adjust exposure time, sensing mode, output signal gain, and light source current, leading to inaccurate measurements and low power efficiency due to over-saturation or insufficient exposure.
Innovation Solution
A distance measurement system with an exposure control unit that dynamically adjusts exposure time, sensing mode, output signal gain, and light source current based on luminance of reflected light to prevent over-saturation or insufficiency, using a light source, sensor, and identification device to calculate distances accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the exposure time of the sensor is fixed without automatic adjustment, then the device structure is simple, but the measurement precision deteriorates due to over-saturation or insufficient exposure
Solution Approach 1:
The exposure control unit continuously monitors the luminance of reflected light sensed by the sensor and automatically adjusts the exposure time accordingly. This feedback mechanism ensures that the sensor operates within optimal exposure ranges, preventing over-saturation and under-exposure, thereby maintaining high measurement precision without requiring complex manual intervention
Solution Approach 2:
The system transitions from a static fixed exposure time to a dynamic adjustable exposure time that adapts to varying luminance conditions. The exposure control unit modifies the exposure time in real-time based on the sensed luminance levels, allowing the device to handle different lighting environments effectively while improving measurement accuracy
2Adaptability or versatility
If the exposure time is not automatically adjusted, then the device complexity is low, but the dynamic range of the sensor is limited
Solution Approach 1:
The exposure control unit uses feedback from the sensor's luminance detection to automatically adjust exposure time, enabling the system to adapt to a wide range of lighting conditions. This feedback loop allows the sensor to operate across its full dynamic range by selecting appropriate exposure times based on real-time luminance measurements
Solution Approach 2:
The system changes the exposure time parameter dynamically based on the luminance of reflected light. By adjusting this critical parameter in response to varying light conditions, the system expands the effective dynamic range of the sensor, allowing it to capture signals from both bright and dim environments
3Measurement precision
If the exposure time is not optimized, then the device structure is simple, but the signal to noise ratio is low
Solution Approach 1:
The exposure control unit continuously monitors the signal quality and adjusts exposure time to maximize the signal-to-noise ratio. By using feedback from the sensor output, the system optimizes exposure parameters to enhance signal strength relative to background noise, thereby improving measurement precision
Solution Approach 2:
The system optimizes the exposure time parameter to achieve the best signal-to-noise ratio for different luminance conditions. By dynamically changing the exposure time based on sensed luminance, the system enhances signal detection capability while minimizing noise impact
4Use of energy by moving object
If the exposure time is not automatically adjusted, then the device complexity is low, but the power efficiency is reduced
Solution Approach 1:
The system transitions from a static exposure time to a dynamic adjustable exposure time that adapts to lighting conditions. By using shorter exposure times in bright environments and longer exposure times only when necessary, the system optimizes power consumption of the sensor and light source, improving overall power efficiency
Solution Approach 2:
The exposure control unit adjusts the exposure time parameter based on luminance conditions to optimize power efficiency. By matching exposure time to actual lighting levels, the system reduces unnecessary energy consumption while maintaining measurement 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 system enhances measurement accuracy and increases the dynamic range and signal-to-noise ratio of the sensor by ensuring optimal luminance levels, thereby improving distance measurement precision and power efficiency.
Implementation Method 1
a light source for transmitting detecting light toward an object, where the detecting light is reflected by a surface of the object to form reflected light
Implementation Method 2
a sensor for sensing the reflected light, where the sensor has a plurality of pixel units respectively corresponding to a plurality of different image positions
Data Source
AI summary
A light source transmits detecting light toward an object. The object reflects the detecting light and forms a reflected light. A sensor is used for sensing the reflected light. Then, an exposure control unit coupled to the sensor performs luminance convergence on the reflected light according to luminance of the reflected light sensed by the sensor. And a distance measurement device coupled to the sensor detects a distance between the object and the light source and/or the sensor according to an image position of the reflected light on the sensor.