Circadian Rhythm Management Using Lambda Filters

The patent segments the spectral measurement task into two parts: using inexpensive filters for broad wavelength band detection and computational algorithms for deriving bio illuminance. Instead of directly measuring the full spectrum with a complex spectrometer, the system divides the visible spectrum into multiple wavelength bands using simple optical filters, measures each band separately with basic photodetectors, and then computationally reconstructs the bio illuminance value. This segmentation enables accurate measurement without requiring a complete reference spectrometer.

The patent introduces computational algorithms as an intermediary between simple optical filter measurements and the final bio illuminance calculation. Rather than directly measuring all spectral components needed for bio illuminance, the system uses measured spectral data at selected wavelength points as intermediaries, then applies mathematical algorithms (including polynomial fitting and spectral reconstruction) to derive the complete bio illuminance value. This intermediary computational step bridges the gap between simple measurements and accurate bio illuminance assessment.

The patent segments the spectral measurement function across multiple simple photodetectors equipped with different wavelength-selective filters, rather than using a single bulky spectrometer. Each photodetector-filter combination is a compact module that can be arranged in a small array, collectively providing spectral information across the visible range. This segmented approach maintains measurement precision while enabling miniaturization, as the total volume of multiple small sensors is much less than a reference spectrometer.

The patent replaces the mechanical/optical complexity of a reference spectrometer (which typically involves moving parts, gratings, or prisms for spectral scanning) with a static array of photodetectors and filters combined with computational processing. Instead of mechanically scanning wavelengths, the system uses simultaneous multi-wavelength detection through parallel photodetector channels, eliminating the need for bulky mechanical spectral analysis components and enabling compact device design.

The patent replaces the expensive reference spectrometer with inexpensive photodetector sensors and optical filters that can be manufactured at low cost using standard semiconductor and optical coating processes. These simple components have low manufacturing costs and can be produced in large quantities, making the overall system economically viable for mass deployment. The trade-off accepts slightly simplified hardware in exchange for dramatically reduced component costs while maintaining adequate measurement precision through computational compensation.

The patent substitutes expensive specialized optical instrumentation (reference spectrometer) with standard, commercially available photodetector sensors and filters combined with software-based spectral analysis. By moving the complex spectral analysis function from hardware to software algorithms, the system eliminates the need for costly precision optical components and specialized measurement instruments, thereby significantly reducing bill of materials costs and manufacturing complexity while preserving measurement accuracy.

The patent segments the spectral response into multiple wavelength bands using filters with different transmission characteristics, rather than relying on a single visual sensitivity curve response. By measuring light intensity through multiple wavelength-selective filters and combining these segmented measurements computationally, the system captures spectral information necessary for accurate bio illuminance calculation while keeping each individual sensor simple and easy to manufacture.

The patent changes the measurement parameters from simple total illuminance (single visual sensitivity response) to multi-wavelength spectral measurements. By introducing wavelength-dependent measurement parameters through multiple filters and photodetector channels, the system gathers sufficient spectral information to calculate circadian action factors and bio illuminance values, transforming a single-parameter measurement into a multi-parameter measurement system that maintains ease of manufacture while improving bio illuminance precision.