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Flexible Liquida??Filled Fiber Adapter Enabled Wearable Optical Sensors
摘要： Wearable optical sensors are attracting intensive research interests owing to their advantage of high sensitivity, fast response, and immunity to electromagnetic interferences. However, tunable optical properties and reconfigurable sensor structures remain great challenges for the wearable optical sensors. Herein, flexible liquid-filled fiber adapters (FLFFAs), which are sensitive to mechanical stimuli, are demonstrated. The novel FLFFA consists of a soft liquid-filled tubing and two silica optical fibers. The liquid core bestows the FLFFA both tunability and reconfigurability in sensing performance. Deformation of the tubing through bending or pressing results in wavelength-insensitive changes in light transmission. By measuring the output intensity, the FLFFA based sensors achieve high angle resolution (0.18°) and low detection limit (0.7 mN) for bending and pressure sensing, respectively. The superior sensing properties together with mechanical flexibility and robustness enable real-time monitoring of finger joint motion, respiration, and wrist pulse. Benefiting from an LED charge-coupled device (CCD) signal recording system, a 4 × 3 keyboard is realized by simultaneously measuring the output signals of 12 FLFFAs. The FLFFA provides a promising method to detect subtle physiological signals and may find applications in healthcare devices, artificial skins, and sensor networks.
关键词： wearable optical sensors,human–machine interface devices,physiological signal monitoring,liquid-filled fiber adapters
更新于2025-09-23 15:19:57
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[IEEE 2019 3rd International Conference on Circuits, System and Simulation (ICCSS) - Nanjing, China (2019.6.13-2019.6.15)] 2019 3rd International Conference on Circuits, System and Simulation (ICCSS) - Long-Term Effect of Visual Fatigue Caused by LEDs with Modulated Light
摘要： The visual fatigue caused by long-term work under steady light generated by fluorescent luminaires and fluctuated light generated by LED luminaires with different modulation depth was investigated through subjective reports of symptoms and physiological signals. Both the subjective feelings and the physiological results show that visual fatigue becomes more serious with increasing time under all the test lighting conditions. Compared to fluorescent luminaires, the LED luminaires with full-modulated light produced significantly severer symptoms. However, the LEDs with 75% modulation depth was fully accepted.
关键词： physiological signal,LEDs,visual fatigue,modulation depth,subjective symptom
更新于2025-09-12 10:27:22