Vehicle Optical Communication Using Polarization Modulation
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Solution Overview
Problem
Current communication devices for vehicles, such as those using light-emitting diodes or radio frequency waves, face inefficiencies in transmitting information due to light flux reduction in pulsed mode and high costs of installing specific transmitters and receivers, respectively.
Innovation Solution
A communication device utilizing a light source that emits a polarized beam, where the direction of polarization is modulated to transmit information, allowing for efficient data transfer without altering light intensity, and can operate with standard vehicle lights, maintaining constant illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If light sources operate in pulsed mode to transfer information, then information transmission capability is improved, but light flux and efficiency deteriorate
Solution Approach 1:
The patent changes the parameter being modulated from light intensity to polarization direction. The light source operates in continuous mode maintaining constant light flux, while a modulator changes the polarization direction of the light beam to encode information. This resolves the contradiction by preserving light flux (continuous operation) while still enabling information transmission through polarization modulation rather than intensity modulation.
2Loss of information
If specific transmitters and receivers are installed to enable radio frequency communication, then information transmission between vehicles is improved, but installation cost and device complexity deteriorate
Solution Approach 1:
The patent makes existing vehicle lighting systems serve dual functions: providing illumination and transmitting information. The same light source that illuminates the road also carries modulated polarization signals for communication. This eliminates the need for separate dedicated transmitters and receivers, reducing device complexity and installation cost while maintaining information transmission capability.
3Loss of information
If light intensity is modulated to transmit information, then information transmission is achieved, but illumination quality and visibility deteriorate
Solution Approach 1:
The patent switches from modulating light intensity to modulating polarization direction. The light intensity remains constant providing stable illumination, while the polarization direction varies to encode information. This resolves the contradiction by separating the illumination function (constant intensity) from the communication function (variable polarization), ensuring both high illumination quality and reliable information transmission.
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 effective information transfer between vehicles without losing luminous flux and reduces installation costs by using existing light sources, ensuring clear differentiation of information transmission.
Implementation Method 1
the emission system being configured to generate a first beam of light polarized in a first direction from the initial beam of light
Implementation Method 2
a modulator of the direction of polarization of the first beam of polarized light so as to transmit information
Implementation Method 3
a reception system configured to detect said first beam of light polarized in said first direction and to transmit said information
Data Source
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Figure 4
AI summary
The invention relates to a communication device, particularly for motor vehicles, comprising an emission system (1), equipped with a light source (2) capable of emitting an initial beam of light (3), the emission system (1) being configured to generate a first beam of polarized light (4) in a first direction (7) from the initial beam of light (3), the emission system (1) further comprising a modulator (11) of the polarization direction of the first beam of polarized light (4) so as to transmit information, the device further comprising a receiving system configured to detect said first beam of polarized light (4) when it is polarized in said first direction (7) and to transmit said information.