Distance Sensing Mode Switching for Wider Range Without Saturation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing distance measuring devices have limited measurable distance ranges and dynamic ranges, leading to saturation issues in distance measurement.
Innovation Solution
A distance measuring device that switches between multiple modes of operation, including varying frequencies, exposure times, duty ratios, and emission intensities to enhance the measurable distance range and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single frequency and exposure time are used for distance measurement, then the measurement process is simple, but the measurable distance range is limited and saturation occurs
Solution Approach 1:
The patent implements dynamic switching between multiple measurement modes (first mode with first frequency and first exposure time, second mode with second frequency and second exposure time) based on object distance. The control unit determines which mode to use, enabling the system to adapt its parameters dynamically to extend the measurable distance range while maintaining measurement accuracy and avoiding saturation.
Solution Approach 2:
The patent changes key parameters (frequency and exposure time) of the light emitting and receiving units based on measurement conditions. By switching between different frequency values and exposure time values, the system can measure distances across a broader range without saturation, effectively resolving the contradiction between measurement range and saturation avoidance.
2Measurement precision
If the light emitting unit emits light continuously at high intensity, then the measurement precision is improved, but saturation occurs and dynamic range is reduced
Solution Approach 1:
The patent employs periodic light emission with different duty ratios in different modes. The light emitting unit emits light intermittently rather than continuously, with the duty ratio adjusted based on the measurement mode. This periodic action allows the system to maintain measurement precision while preventing saturation and expanding the dynamic range.
Solution Approach 2:
The system dynamically adjusts the emission intensity and exposure time based on the selected mode. In the first mode, higher intensity and longer exposure time are used for closer objects, while in the second mode, lower intensity and shorter exposure time are used for farther objects, thereby maintaining precision across different distances without causing saturation.
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 device extends the measurable distance range and improves dynamic range, enabling accurate distance measurements over a broader area without saturation.
Implementation Method 1
a light receiving unit that receives reflected light of the irradiation light reflected by an object
Implementation Method 2
a calculation unit that calculates a distance to the object, on the basis of the time from emission of the irradiation light to reception of the reflected light
Data Source
AI summary
The present technology relates to a distance measuring device and a distance measuring method that enable distance measurement with an extended measurable distance range. The distance measuring device includes a control unit that controls a light emitting unit that emits irradiation light and a light receiving unit that receives reflected light of the irradiation light reflected by an object. In a first mode, control is performed on first imaging. In a second mode, control is performed on the first imaging, the second imaging, and third imaging. The distance is calculated from a first signal obtained by the first imaging and a second signal obtained by the second imaging, or the distance is calculated from the first signal, the second signal, and a third signal obtained by the third imaging.