Bio Illuminance Measuring Device Using Circadian Lambda Filter
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Solution Overview
Problem
Conventional illuminance measuring apparatuses fail to accurately measure bio illuminance values affecting human circadian rhythms due to their reliance on visual sensitivity curves, which do not account for varying emission spectra of external light sources, necessitating expensive reference spectrometers and limiting miniaturization.
Innovation Solution
A bio illuminance measuring apparatus utilizing a circadian lambda filter and a visual lambda filter to calculate bio illuminance by determining the circadian action factor through a circadian action function, which varies with visual wavelength signals, allowing for a more precise measurement without additional components and at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference spectrometer is used to measure bio illuminance, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a simplified copy of the spectrometer functionality by using a photo sensing portion with circadian and visual lambda filters that replicates the spectral measurement capability. Instead of using a full spectrometer, the invention uses filtered photodetection to capture the essential circadian action information, achieving accurate bio illuminance measurement without the complexity of a complete spectral instrument.
Solution Approach 2:
The invention extracts only the necessary measurement capability from a full spectrometer. By using a photo sensing portion with specific circadian and visual lambda filters, the system extracts only the circadian action factor information needed for bio illuminance calculation, omitting the unnecessary full spectral analysis components of a reference spectrometer.
2Measurement precision
If a reference spectrometer is used to measure bio illuminance, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces the expensive reference spectrometer with a much cheaper photo sensing portion consisting of standard photodetectors combined with circadian and visual lambda filters. This substitution dramatically reduces manufacturing cost while maintaining the ability to measure bio illuminance accurately through the calculated circadian action factor.
Solution Approach 2:
The invention creates a low-cost alternative that copies the essential measurement function of expensive spectrometers. By using affordable photodetection components with wavelength-selective filters, the system replicates the bio illuminance measurement capability without requiring costly spectral instrumentation.
3Measurement precision
If a reference spectrometer is used to measure bio illuminance, then measurement precision is improved, but device size increases limiting miniaturization
Solution Approach 1:
The invention extracts only the essential measurement function from a bulky spectrometer. By using a photo sensing portion with wavelength-selective filters instead of full spectral analysis, the system achieves bio illuminance measurement capability in a compact form factor suitable for miniaturization and mobile applications.
Solution Approach 2:
The patent creates a miniaturized version of spectrometer functionality using a photo sensing portion that copies the essential spectral filtering and detection capability. This approach enables accurate bio illuminance measurement in a small device that can be integrated into mobile phones, wearables, and other portable applications.
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 bio illuminance measurement, miniaturization, and cost-effectiveness, while diagnosing and reinforcing circadian rhythms, potentially addressing disorders related to circadian disturbances.
Implementation Method 1
a circadian lambda filter which passes along external light according to a circadian rhythm sensitivity curve
Implementation Method 2
a visual lambda filter which passes along the external light according to a visual sensitivity curve
Implementation Method 3
a photo sensing portion that senses and converts the external light, which has passed through the circadian lambda filter, into a circadian wavelength signal and senses and converts the external light, which has passed through the visual lambda filter, into a visual wavelength signal
Data Source
AI summary
Disclosed is a bio illuminance measuring apparatus including a circadian lambda filter passing external light along according to a circadian rhythm sensitivity curve, a visual lambda filter passing the external light along according to a visual sensitivity curve, a photo sensing portion sensing and converting the external light, which has passed through the circadian lambda filter, into a circadian wavelength signal and sensing and converting the external light, which has passed through the visual lambda filter, into a visual wavelength signal, and an illuminance calculating portion which calculates a ratio between the circadian wavelength signal and the visual wavelength signal, calculates a circadian action factor by applying the ratio between the circadian wavelength signal and the visual wavelength signal to a circadian action function which varies according to the visual wavelength signal, and calculates a bio illuminance value of the external light on the basis of the circadian action factor.