Controllable Light Angle Selector for Photometer Spatial Filtering
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Solution Overview
Problem
Current light management systems lack the ability to accurately measure and control the lighting characteristics of individual light sources and their contributions to a scene, particularly in ambient lighting systems, as they cannot effectively redirect and analyze light from specific directions.
Innovation Solution
A controllable light angle selecting device is introduced, which uses light redirecting means such as electro-wetting cells, liquid crystal cells, or wedge elements to adjust the angular difference between incoming and exiting light, allowing for precise selection and measurement of light intensity and spectral content by directing it through a passive light selecting means to a light measuring sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photometer is used to measure light properties, then light intensity and spectral content can be measured, but the ability to determine which specific light source contributes to illumination of a particular area is lost
Solution Approach 1:
The photometer is divided into functionally independent modules: a light redirecting means for spatial selection, a passive light selecting means for spectral selection, and a light measuring sensor for detection. This segmentation allows each module to perform its specific function independently, enabling both precise light property measurement and identification of contributing light sources through spatial filtering.
Solution Approach 2:
A light redirecting means acts as an intermediary component between the scene and the light measuring sensor. This intermediary selectively redirects light from specific directions (corresponding to specific light sources) toward the sensor, enabling the system to identify which light sources contribute to the illumination of a particular area while maintaining measurement precision.
2Loss of information
If light is redirected from specific directions to a sensor, then light source contribution can be determined, but device complexity increases
Solution Approach 1:
The light redirecting means utilizes the inherent optical properties of the scene and light sources to perform spatial selection automatically. By directing light from specific directions without requiring complex active control mechanisms, the system achieves light source identification while keeping the device relatively simple.
Solution Approach 2:
The passive light selecting means serves multiple functions: it acts as a spectral filter, a direction indicator, and a component that works seamlessly with the light redirecting means. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while maintaining the ability to determine light source contribution.
3Adaptability or versatility
If multiple light sources illuminate a scene, then rich lighting characteristics are available, but the ability to measure and control individual light source characteristics is lost
Solution Approach 1:
The system segments the measurement task by spatially separating the detection paths for different light sources through the light redirecting means, while the passive light selecting means segments the spectral content. This dual segmentation enables precise measurement of individual light source characteristics even when multiple light sources illuminate the scene simultaneously.
Solution Approach 2:
The system adds a spatial dimension to the measurement process by using the light redirecting means to select light from specific directions. This dimensional addition allows the photometer to distinguish between multiple light sources based on their spatial origin, enabling precise measurement of individual light source characteristics while maintaining adaptability to complex lighting scenes.
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
This solution enables the photometer to analyze the intensity and spectral content of light from specific directions, enhancing the resolution of light filters and determining which light source contributes to the illumination of a particular area, thereby improving the control and measurement of lighting characteristics.
Implementation Method 1
a light redirecting means (120) arranged to receive light from the surroundings via its light input side (121), and to transmit light to the passive light selecting means (110) via the light output side (122) of the light redirecting means (120)
Implementation Method 2
The passive light selecting means (110) has a defined fixed acceptance angle of light incidence
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
A controllable light angle selecting device (100) is provided. It comprises a fixed light selecting means (110) adapted to transmit light incident thereon within a limited acceptance angle, optically connected to at least one light redirecting means (120) capable of obtaining a variable angular difference between light entering said light redirecting means (120) and light exiting said light redirecting means. A photometer, comprising a controllable light angle selector arranged in the path of light between a light source and a light measuring sensor is also provided.