Pulsed Light Detector Array Signal Synthesis for Noise Reduction
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Solution Overview
Problem
Existing devices for detecting pulsed light emitted and reflected from objects suffer from inaccuracies, particularly under sunlight conditions, due to high noise levels and reduced signal-to-noise ratios.
Innovation Solution
The use of a light-receiving element array with multiple small sub-light receiving areas synthesizes current signals to reduce random noise and enhance the signal-to-noise ratio, while a high-pass filter eliminates the DC component, allowing for accurate detection of pulsed light even in adverse weather conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light receiving element is used to detect pulsed light, then the device structure is simple, but the detection accuracy is low due to high noise levels and reduced signal-to-noise ratio
Solution Approach 1:
The light receiving element is divided into multiple sub-light receiving areas (first sub-light receiving area, second sub-light receiving area, etc.). Each sub-area independently detects light signals and generates current signals. This segmentation allows the system to process multiple signals simultaneously, improving signal-to-noise ratio through signal synthesis while maintaining a relatively simple overall structure.
2Measurement precision
If multiple sub-light receiving areas are used to synthesize current signals, then the signal-to-noise ratio is enhanced, but the device complexity increases
Solution Approach 1:
The current signals from multiple sub-light receiving areas are synthesized (combined) to produce an output signal. This merging process enhances the signal-to-noise ratio by accumulating useful signal components while averaging out random noise. The synthesis is achieved through electrical connection of the sub-elements, providing a straightforward implementation that balances performance improvement with structural simplicity.
Solution Approach 2:
A high-pass filter is introduced to extract the pulsed light signal component from the synthesized current signal by removing the DC component. This extraction process isolates the useful AC signal (pulsed light detection) from the unwanted DC offset, further improving detection accuracy without significantly increasing device complexity.
3Measurement precision
If the DC component is not removed from the detected signal, then the detection process is simpler, but the accuracy of pulsed light detection is reduced due to noise interference
Solution Approach 1:
The high-pass filter is specifically designed to extract and remove the DC component from the synthesized current signal. By taking out the unwanted DC offset, the filter preserves the AC signal components that contain the pulsed light information while eliminating a major source of noise and interference, thereby improving detection accuracy.
Solution Approach 2:
The high-pass filter acts as an intermediary element between the signal synthesis stage and the final detection stage. It mediates the signal by selectively passing AC components (pulsed light signals) while blocking DC components, thus preparing the signal for accurate detection without requiring complex processing in subsequent stages.
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
This approach improves the accuracy of pulsed light detection and extends the detection range, enabling reliable object recognition and distance measurement, even in environments with sunlight and adverse weather.
Implementation Method 1
a plurality of light receiving elements 1 to receive the pulsed light; current signals output from the plurality of light receiving elements 1 are synthesized
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
A pulsed light detector (150) to detect pulsed light projected onto and reflected from an object includes a light-receiving element array (10). The light-receiving element array (10) includes a plurality of light receiving elements (1) with output terminals (3) connected to each other to receive the pulsed light.