Measurement Apparatus Ambient Light Filtering
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Solution Overview
Problem
Existing measurement apparatuses struggle to distinguish reflected light from ambient light such as sunlight and oncoming vehicle light, leading to deteriorated detection performance.
Innovation Solution
A measurement apparatus comprising a light emitting unit, a first light receiving unit for reflected light, a second light receiving unit for ambient light, and a control unit that adjusts the intensity of measurement light and calculates distance based on light receiving results from both units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light receiving unit is used to receive reflected light, then the device complexity is low, but the detection precision deteriorates due to inability to distinguish ambient light from reflected light
Solution Approach 1:
The light receiving unit is divided into two separate units: a first light receiving unit that receives reflected light at a first wavelength, and a second light receiving unit that receives ambient light at a second wavelength. This segmentation allows the system to distinguish between reflected light and ambient light, thereby improving detection precision while maintaining manageable device complexity through functional separation.
Solution Approach 2:
The measurement apparatus is designed with multi-functionality by enabling the light receiving system to simultaneously perform two functions: measuring reflected light intensity for distance calculation and detecting ambient light intensity for noise compensation. This multi-functional design improves detection precision without proportionally increasing device complexity.
2Measurement precision
If measurement light intensity is increased to improve signal strength, then the detection precision improves, but the harmful effect of ambient light interference increases
Solution Approach 1:
The system employs feedback by using the second light receiving unit to continuously monitor ambient light intensity and feeding this information back to the control unit. The control unit then adjusts the measurement light intensity or applies compensation algorithms based on the ambient light levels, thereby maintaining detection precision while mitigating the harmful effects of ambient light interference.
Solution Approach 2:
The system dynamically changes the parameter of measurement light intensity based on ambient light conditions. When ambient light intensity increases, the system adjusts the measurement light intensity or timing parameters to maintain optimal signal-to-noise ratio, thereby preserving detection precision while managing ambient light interference effects.
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 solution improves detection performance by effectively filtering out ambient light and optimizing measurement light intensity based on ambient light conditions, thereby enhancing measurement accuracy.
Implementation Method 1
a light emitting unit configured to emit measurement light toward a measurement area
Implementation Method 2
a first light receiving unit configured to receive reflected light from the measurement area
Implementation Method 3
a second light receiving unit configured to receive, among pieces of light from the measurement area, light having a wavelength different from that of the measurement light
Data Source
AI summary
A measurement apparatus includes: a light emitting unit, a first light unit, and a control unit. The light emitting unit emits measurement light toward a measurement area. The first light receiving unit that receives reflected light from the measurement area. The control unit controls the light emitting unit and the first light receiving unit and calculates a distance to an object in the measurement area based on a light receiving result of the first light receiving unit. The measurement apparatus further includes a second light receiving that receives, among pieces of light from the measurement area, light having a wavelength different from that of the measurement light.