Circadian Illuminance Measurement Using Lambda Filter Extraction
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Solution Overview
Problem
Conventional circadian illuminance measuring apparatuses are complex and costly, requiring additional components to calculate circadian illuminance, which complicates the measurement process and does not accurately account for the varying light sensitivity affecting human circadian rhythms.
Innovation Solution
A circadian illuminance measuring apparatus utilizing a circadian lambda filter that passes light according to a circadian sensitivity curve, combined with a light sensor and a circadian illuminance calculator to simplify the measurement process, omitting unnecessary components and enabling cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional circadian illuminance measuring apparatus uses a visual lambda filter and measures both illuminance value and luminescence spectrum to calculate circadian illuminance, then measurement accuracy is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent extracts only the necessary wavelength band (480±20nm) relevant to circadian rhythm measurement using a circadian lambda filter, eliminating the need to measure the full luminescence spectrum. This extracts the essential information while discarding unnecessary data, simplifying the measurement system while maintaining measurement accuracy for circadian illuminance.
Solution Approach 2:
The patent applies local quality by using a circadian lambda filter with specific wavelength characteristics (480±20nm) that matches the sensitivity curve of the circadian rhythm. Instead of using a general visual lambda filter that covers the entire visible spectrum, the filter is locally optimized to pass only the wavelength band that most affects circadian rhythm, thereby simplifying the system while improving measurement relevance.
2Measurement precision
If a conventional circadian illuminance measuring apparatus measures both illuminance value and luminescence spectrum, then measurement completeness is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent extracts only the essential wavelength information needed for circadian illuminance measurement by using a circadian lambda filter. This eliminates the need for complex spectrometer components and spectrum analysis algorithms, making the apparatus much easier to manufacture while still providing complete circadian illuminance measurement data.
Solution Approach 2:
The patent replaces the complex mechanical/optical system required for full spectrum measurement with a simpler system using a circadian lambda filter and a standard illuminance sensor. This substitution maintains measurement completeness for circadian purposes while dramatically easing manufacturing requirements.
3Illumination intensity
If a general illuminance measuring apparatus uses a visual lambda filter following the visual sensitivity curve, then visual illuminance measurement is improved, but circadian illuminance measurement accuracy deteriorates
Solution Approach 1:
The patent applies local quality by using a circadian lambda filter with specific wavelength characteristics (480±20nm) that matches the sensitivity curve of the circadian rhythm. Instead of using a general visual lambda filter that covers the entire visible spectrum, the filter is locally optimized to pass only the wavelength band that most affects circadian rhythm, thereby improving circadian illuminance measurement accuracy while maintaining visual illuminance measurement capability.
Solution Approach 2:
The patent changes the wavelength selection parameter from the visual sensitivity curve (peaking at 555nm) to the circadian sensitivity curve (peaking at 480nm with ±20nm bandwidth). This parameter change allows the same illuminance sensor to accurately measure circadian illuminance by filtering the light to match the circadian rhythm's spectral sensitivity.
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 apparatus accurately measures circadian illuminance in a simplified manner, allowing for the diagnosis and reinforcement of the user's circadian rhythm, effectively addressing disturbances that lead to diseases such as seasonal affective disorders and sleep disorders.
Implementation Method 1
a circadian lambda filter configured to pass external light according to a circadian sensitivity curve
Implementation Method 2
a light sensor configured to sense the external light has passed through the circadian lambda filter, convert the external light into an analog signal
Data Source
AI summary
The present disclosure provides a circadian illuminance measuring apparatus including: a circadian lambda filter configured to pass external light according to a circadian sensitivity curve; a light sensor configured to sense the external light has passed through the circadian lambda filter, convert the external light into an analog signal, and output the analog signal; and a circadian illuminance calculator configured to convert the analog signal into a digital signal to calculate circadian illuminance of the external light.