Multi-Wavelength Imaging Device for Distance Measurement
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Solution Overview
Problem
Existing imaging technologies face challenges in accurately measuring distances to target objects due to wavelength attenuation by sunlight outdoors and degradation of image sensor sensitivity indoors, as well as interference between laser diode light beams of different wavelengths, which affects measurement accuracy across various environments.
Innovation Solution
An imaging device employing multiple laser diodes emitting light at different wavelengths, with a configuration that includes separate detection units and optical members to guide reflected light, ensuring non-overlapping emission and detection periods and strategic light source placement to minimize interference and shadow generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser diode light with a specific wavelength is used for distance measurement outdoors, then distance measurement is possible, but the light is attenuated by the sunlight spectrum
Solution Approach 1:
The patent changes the wavelength parameter of the laser diode light based on the measurement environment. Specifically, it uses 940nm wavelength light for outdoor measurements where sunlight attenuation is less severe, and 850nm wavelength light for indoor measurements where the sunlight spectrum attenuation is avoided. This parameter change allows the system to adapt to different environmental conditions and maintain measurement accuracy.
2Measurement precision
If laser diode light with a different wavelength is used to avoid sunlight spectrum attenuation, then outdoor measurement is improved, but transmittance and spectral sensitivity of the image sensor are degraded indoors
Solution Approach 1:
The patent implements dynamic switching between different laser diode wavelengths based on the measurement environment. The system can dynamically select 940nm wavelength for outdoor use and 850nm wavelength for indoor use, ensuring optimal performance in both conditions. This dynamic adaptation resolves the contradiction by allowing the system to change its operational parameters according to environmental conditions.
3Measurement precision
If laser diode light beams with different wavelengths are used to measure distance in different environments, then measurement accuracy is improved, but the light beams interfere with each other
Solution Approach 1:
The patent employs periodic alternation between different wavelength emissions. The laser diodes emit light in alternating time periods - one laser diode emits at 940nm while the other is inactive, then they switch. This periodic action allows the system to use multiple wavelengths for different environments without causing interference, as each wavelength is active at different times.
4Measurement precision
If the light source is disposed near the optical axis to reduce distance measurement error, then measurement accuracy is improved, but a shadow of irradiation is generated on the side surface of the target object
Solution Approach 1:
The patent divides the illumination function into multiple light sources positioned at different locations. By using multiple laser diodes disposed at different positions around the optical axis, the system can segment the irradiation task so that each light source covers different areas, thereby reducing shadow generation on side surfaces while maintaining measurement accuracy through the combined coverage.
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
Enables accurate distance measurement in diverse environments by utilizing distinct wavelengths without interference, improving measurement precision and reducing errors caused by angular differences and shadow effects.
Implementation Method 1
an optical member configured to transmit part of the light reflected by the target object to guide the first reflected light to the first detection unit, and reflect part of the light reflected by the target object to guide the second reflected light to the second detection unit
Data Source
AI summary
An imaging device includes a first light source that emits first irradiation light that is light having a first wavelength, a second light source that emits second irradiation light that is light having a second wavelength different from the first wavelength, a first detection unit that detects first reflected light that is reflected light of the first irradiation light with which a target object is irradiated, a second detection unit that detects second reflected light that is reflected light of the second irradiation light with which the target object is irradiated, and an optical member that transmits part of the light reflected by the target object to guide the first reflected light to the first detection unit, and reflects part of the light reflected by the target object to guide the second reflected light to the second detection unit.