Optical Module Calibration via Segmented Light Receiving Sections
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Solution Overview
Problem
Current distance-measuring devices face challenges in easily providing an optical path for calibration, particularly in accurately measuring distances to targets using existing methods like TOF, which can result in deviations between measured and actual distances due to circuitry delays and other factors.
Innovation Solution
The proposed solution involves an optical module with a light-emitting section, a light-receiving section, a first cover part, and a second cover part, where the first cover part guides light towards a target and reflects monitoring light in a different direction, while the second cover part directs reflected light and monitoring light to separate receiving sections, allowing for distance calculation and calibration using pixel signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional TOF distance-measuring device is used, then distance measurement can be performed, but the optical path for calibration is difficult to provide and measurement accuracy is reduced due to circuitry delays
Solution Approach 1:
The light-receiving section is divided into two separate sections: a first light-receiving section for receiving reflected light from the target and a second light-receiving section for receiving monitoring light used for calibration. This segmentation allows independent optimization of each receiving path, enabling accurate distance measurement while providing a dedicated calibration path without increasing overall device complexity
Solution Approach 2:
A monitoring light-emitting body is introduced as an intermediary element to provide a reference light path for calibration. This monitoring light travels through the same optical components (lens, cover part) as the measurement light but is directed to a separate receiving section, serving as a reference to compensate for optical path delays and improve measurement accuracy
2Ease of operation
If the optical path is simplified for easier calibration, then calibration becomes more accessible, but distance measurement accuracy may be compromised
Solution Approach 1:
The monitoring light path is pre-configured through the cover part and lens using the same optical components as the measurement path. This preliminary setup of a reference path allows for easy calibration by comparing the monitoring light travel time against the reflected light travel time, maintaining measurement accuracy while simplifying the calibration process
Solution Approach 2:
The system uses feedback from the second light-receiving section that detects monitoring light to校准 the distance measurements. By continuously comparing the expected monitoring light path with actual measurements, the system can compensate for optical delays and maintain high accuracy while keeping the calibration process accessible
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 configuration enables easier optical path adjustment and improves the accuracy of distance measurement by calibrating the distance based on pixel signals from both receiving sections, reducing deviations and enhancing the precision of distance calculations.
Implementation Method 1
the first cover part is configured to guide first light that is a portion of the light emitted from the light-emitting section in a direction of a target and guide second light that is another portion of the light emitted from the light-emitting section in a direction different from the direction of the target
Implementation Method 2
The second cover part is provided on a light incidence side of the light-receiving section. The second cover part is configured to guide reflected light that is the first light reflected by the target in a direction of the first light-receiving section and guide the second light guided from the first cover part in a direction of the second light-receiving section
Data Source
AI summary
An optical module according to the present disclosure includes: a light-emitting section (10) configured to emit light; a light-receiving section (20) including a first light-receiving section and a second light-receiving section; a first cover part (30) provided on a light emission side of the light-emitting section (10), and configured to guide first light (L1) that is a portion of the light emitted from the light-emitting section (10) in a direction of a target (2) and guide second light (L2) that is another portion of the light emitted from the light-emitting section (10) in a direction different from the direction of the target (2); and a second cover part (40) provided on a light incidence side of the light-receiving section (20), and configured to guide reflected light (L1R) that is the first light (L1) reflected by the target (2) in a direction of the first light-receiving section and guide the second light (L2) guided from the first cover part (30) in a direction of the second light-receiving section.