Optical Sensors TRIZ Cases
- Pinned Photodiode PPG Readout for Low-Power Wearable Sensing
Pinned photodiode PPG readout removes the DC component at detection, cutting LED power use and improving signal-to-noise in wearables.
- Monolithic Tissue Interface for Low-Bias Pulse Oximetry
A single-material tissue interface uses high- and low-transmission regions to block stray light and improve SpO2 accuracy on darker skin.
- Flexible Glucose and Sleep Monitoring with Embedded Optical Sensing
Blind-hole embedded optical sensing adds non-invasive glucose detection to a flexible piezoelectric sleep monitor without separate hardware.
- Wearable Optical Sensor Fresnel Structure for Thin Biometric Sensing
A recessed Fresnel pattern in the insulating member focuses and collects light for slimmer, lower-power biometric sensing.
- Optical Oximeter Contact Surface to Suppress Light Piping
Optical barriers and angle-limited sensing suppress light piping through air or sweat layers, improving tissue oximetry accuracy on curved surfaces.
- Non-Invasive Glucose Sensing With Dual-Wavelength PPG Compensation
Dual-wavelength PPG amplitude ratios compensate for individual and environmental variation to improve non-invasive blood glucose accuracy.
- Back-Scattered Polarimetric Glucose Sensing With Adaptive Filtering
Back-scattered polarized light and adaptive filtering improve non-invasive glucose measurement accuracy despite tissue depolarization and optical noise.
- Wearable Tissue Measurement Using Multi-Distance NIR Signal Isolation
Multiple source-detection distances isolate weak tissue-element signals from body background, improving noninvasive concentration measurement.
- Pulse Oximetry Using Dual Optical Paths to Correct Tissue Scattering
Dual transmissive and reflective sensing improves SpO2 accuracy by compensating for tissue scatter, LED variation, and skin tone differences.
- Pulse Oximeter LED Circuit Using Capacitor Pulses for Low-Current Power
A capacitor-driven pulsed LED circuit lets pulse oximeters run from low-current coin cells while preserving blood oxygen and heart rate measurement.