Sunscreen Detection Device Using Wavelength Absorption

The device segments the light detection into multiple discrete wavelength channels, each with its own sensor element. This allows precise measurement of sunscreen absorption characteristics at different wavelengths while keeping each individual sensor element simple and manageable.

The patent introduces light sources at specific wavelengths as intermediaries to indirectly measure sunscreen coverage. Instead of directly detecting sunscreen presence, the system uses light absorption at characteristic wavelengths as a mediator to infer coverage levels, improving precision without requiring direct contact or complex sensors.

The device applies local quality by selecting specific discrete wavelengths where sunscreen and skin have distinct absorption characteristics. Rather than using a broad spectrum, it focuses energy only at the critical wavelengths needed for differentiation, improving precision while minimizing energy use.

The system uses partial action by illuminating only at the specific wavelengths necessary for detection rather than continuous full-spectrum light. This provides sufficient information for accurate measurement while consuming minimal energy, avoiding the excess of continuous illumination.

The device implements immediate feedback by processing light absorption measurements and providing real-time indicators of sunscreen coverage status. This allows users to instantly know whether adequate sunscreen is applied, improving ease of operation without significant time loss through efficient processing algorithms.

The system performs self-service by automatically measuring coverage and providing feedback without requiring user interpretation or additional steps. The device independently completes the entire measurement and communication process, minimizing processing time while maximizing ease of use.