Photoelectric Conversion Device Gating Period Pulse Pattern Detection
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Solution Overview
Problem
Existing photoelectric conversion devices face challenges in reducing the influence of light from sources other than the intended light source, which affects the accuracy of distance measurement in ranging devices.
Innovation Solution
A photoelectric conversion device is designed with a photon detection element, a control unit, a gating unit, and a pattern detection unit, where the gating period is equal to or greater than the light emission pulse pattern duration, allowing for comparison of light reception and emission pulse patterns to identify and filter out unwanted light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gating period is extended to capture more light signals for improved detection, then the light reception sensitivity is improved, but the influence of ambient light from other sources increases
Solution Approach 1:
The light source emits light in periodic pulse patterns with specific timing intervals. The control unit synchronizes the gating period with these periodic light emission pulses, enabling the photoelectric conversion device to selectively detect only light signals that arrive during the expected time windows corresponding to the periodic emission pattern, thereby distinguishing target light from ambient light
Solution Approach 2:
The control unit pre-configures the gating period timing and duration before light reception based on the known light emission pulse pattern. By establishing the detection window in advance synchronized with the light emission timing, the system prepares to capture only relevant light signals while automatically excluding ambient light that falls outside the pre-defined gating period
2Object-affected harmful factors
If the gating period is shortened to exclude ambient light, then the influence of light from other sources is reduced, but the detection sensitivity decreases
Solution Approach 1:
The system dynamically adjusts the gating period parameters (timing and duration) based on the light emission pulse pattern characteristics. By optimizing these parameters to match the expected light signal arrival times and durations, the system achieves the maximum possible gating period width that still excludes ambient light, thereby maintaining high detection sensitivity without compromising light source discrimination
3Measurement precision
If the light emission pulse pattern duration is extended to improve signal strength, then the detection accuracy is improved, but the time required for measurement increases
Solution Approach 1:
The light source emits multiple periodic pulses within a complete measurement cycle, with each pulse contributing to the accumulated signal. The periodic repetition allows the system to achieve sufficient signal strength through multiple short pulses rather than requiring a single long pulse, thereby reducing the overall measurement time while maintaining detection accuracy
Solution Approach 2:
The periodic light emission creates a continuous stream of useful light signals during the measurement period. By maintaining continuous periodic emission rather than intermittent long pulses, the system ensures that light signals are constantly available for detection, improving the reliability and accuracy of distance measurement without extending the total measurement time
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 solution effectively reduces the impact of ambient light and light from other sources, enhancing the accuracy of distance measurements in ranging devices by ensuring only light from the intended source is detected.
Implementation Method 1
a photon detection element configured to generate a light reception pulse signal according to incident light
Data Source
AI summary
A photoelectric conversion device includes: a photon detection element configured to generate a light reception pulse signal according to incident light; a control unit configured to control a light emission pulse pattern of a light source, a light emission timing of the light source, and a gating period with respect to the light emission timing; a gating unit configured to output a light reception pulse pattern of the incident light based on the light reception pulse signal that is input in the gating period; and a pattern detection unit configured to compare the light reception pulse pattern with the light emission pulse pattern to output a signal according to a comparison result. A length of the gating period is equal to or greater than a length of a duration of the light emission pulse pattern.