Light Index Calculation for Wide-Region PPFD Assessment
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Solution Overview
Problem
Existing light quantum meters are limited in measuring photon flux density for photosynthesis in wide regions, particularly in varying conditions like stadiums where vegetation areas experience significant changes due to time, seasons, and weather, making it difficult to grasp the light environment effectively.
Innovation Solution
An information processing device that calculates indices for light entering a measurement target region by using a reference reflection region to determine sunny and shady place indices, which are then applied to the target region to assess photosynthetic photon flux density (PPFD) across a wider area, employing optical filters and look-up tables to process light data from sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light quantum meter measures photon flux density in a pinpoint region, then measurement precision for photosynthesis is improved, but the ability to measure light conditions in a wider region deteriorates
Solution Approach 1:
The patent divides the measurement target region into multiple sections (e.g., sunny region and shady region) and performs separate measurements for each section. This segmentation allows the device to maintain precise measurement capability while expanding the overall measurement area by systematically covering multiple regions rather than attempting a single large-area measurement.
Solution Approach 2:
The patent transitions from measuring light conditions at a single point to measuring across multiple spatial dimensions by incorporating multiple measurement sections that cover different regions (sunny and shady areas). This dimensional expansion enables comprehensive assessment of light distribution across the entire measurement target area.
2Adaptability or versatility
If the measurement device covers a wider region, then the applicability to stadium lawns and similar areas is improved, but the measurement precision for specific light conditions deteriorates
Solution Approach 1:
The patent applies different measurement strategies to different regions based on their specific characteristics. Sunny regions and shady regions are measured separately with appropriate reference indices (sunny place reference index and shady place reference index), allowing each region to receive tailored measurement treatment that preserves precision while contributing to the overall wide-area coverage.
Solution Approach 2:
By segmenting the wide measurement target area into distinct regions (sunny and shady sections) and performing specialized measurements for each, the device maintains measurement precision for specific light conditions while achieving broad adaptability across different environmental zones within the stadium lawn.
3Measurement precision
If the device performs sensing for both reference reflection region and measurement target region, then the accuracy of light index calculation is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a reference reflection region as an intermediary element that reflects light with known characteristics. By measuring this reference region and using its reflected light properties as a baseline for calculation, the device can accurately determine light indices for the measurement target region without requiring direct complex measurements of all target conditions, thereby reducing overall system complexity.
Solution Approach 2:
The reference reflection region serves as a copy or model with known light reflection characteristics. By using this standardized reference copy, the device can calculate light indices for the measurement target region through comparison and proportionality, simplifying the measurement process while maintaining high accuracy through the use of the known reference values.
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 the accurate assessment of PPFD in wide regions, such as stadium lawns, by dividing the area into sections and calculating specific indices for sunny and shady areas, providing detailed insights into light conditions essential for vegetation management.
Implementation Method 1
a sensor that performs sensing for light having passed through the optical filter
Implementation Method 2
an optical filter that transmits a wavelength range corresponding to a photosynthetic photon flux density
Data Source
AI summary
An information processing device configured to obtain an index with regard to light entering a measurement target region in a wider range is disclosed. The information processing device calculates, on a basis of a measured value of a reference reflection region, a reference index including a sunny place reference index and a shady place reference index, and calculates, on a basis of a measured value of a measurement target region obtained by performing sensing for the measurement target region and the reference index, a measurement target region index including a sunny measurement target region index being an index with regard to light entering a sunny region in the measurement target region and a shady measurement target region index being an index with regard to light entering a shady region in the measurement target region.