Optical Sensor Device Angle-of-Incidence Compensation
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Solution Overview
Problem
Existing sun position sensors in motor vehicles have a non-isotropic directional characteristic due to sensitivity dependence on the angle of incidence, leading to inaccurate detection of solar radiation power, which affects the determination of radiant power impinging on drivers.
Innovation Solution
An optical sensor device with a light-sensitive receiving element and an optical imaging device that compensates for angle-of-incidence-dependent sensitivity by adjusting the radiant power during transmission, ensuring a uniform directional characteristic across a predetermined range of angles, allowing for accurate detection of solar radiation power impinging on drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-sensitive receiving element with angle-of-incidence-dependent sensitivity is used, then the device can detect solar radiation power, but the detection accuracy varies with the angle of incidence
Solution Approach 1:
The patent changes the optical parameters of the imaging device (focal length, aperture, lens shape) as a function of the angle of incidence. Specifically, the focal length is varied angularly to compensate for the angle-of-incidence-dependent sensitivity of the receiving element, thereby maintaining constant detection response across different incident angles
Solution Approach 2:
The optical imaging device acts as an intermediary between the solar radiation and the light-sensitive receiving element. It modifies the optical path and adjusts the radiant power distribution angularly, serving as a mediator that compensates for the receiver's angular sensitivity variations
2Reliability
If the optical imaging device compensates for angle-dependent sensitivity, then uniform directional characteristic is achieved, but device complexity increases
Solution Approach 1:
The optical imaging device has different optical properties in different angular zones. The focal length and other parameters are locally optimized for specific angle ranges, creating a non-uniform optical system that achieves uniform angular response through localized parameter variations
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 ensures that the detected radiant power is independent of the angle of incidence, providing accurate irradiance perception and enabling effective air-conditioning control within the vehicle, maintaining a constant temperature and enhancing comfort by ensuring consistent radiant power measurement across various sun positions.
Implementation Method 1
an optical imaging device for transmitting the solar radiation onto the light-sensitive receiving element
Implementation Method 2
a light-sensitive receiving element for detecting the radiant power
Data Source
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AI summary
The invention relates to an optical sensor device (3) for a motor vehicle (1) for determining the radiant power of solar radiation (4) incident on a driver (5) located inside the motor vehicle (1), comprising a light-sensitive receiving element (12) for detecting the radiant power, wherein the light-sensitive receiving element (12) has an angle-of-incidence-dependent sensitivity for a predetermined angle-of-incidence range (E) of the solar radiation (4), and comprising an optical imaging device (15) for transmitting the solar radiation (4) to the light-sensitive receiving element (12), wherein the optical imaging device (15) is designed to change the radiant power of the solar radiation (4) incident on the optical imaging device (15) from the predetermined angle-of-incidence range (E) in a manner dependent on the angle of incidence during transmission in order to compensate for the angle-of-incidence-dependent sensitivity of the light-sensitive receiving element (12).so that the radiant power detected by the light-sensitive receiving element (12) after transmission is independent of the angle of incidence within the predetermined angle of incidence range (E). The invention also relates to a driver assistance system (2) and a motor vehicle (1).