Skin Sensing using Spectral Analysis

摘要

A power tool includes a moving implement, implement arrest mechanism, light emitters, photodetector, and controller. The controller activates a first emitter to direct light with a wavelength between 800 nm and 1100 nm on an object and identifies a first reflectance level of the object from a reflectance signal from the photodetector. The controller activates a second emitter to direct light with a wavelength between 1350 nm and 1800 nm on the object and identifies a second reflectance level of the object from the photodetector. The controller activates the implement arrest mechanism to prevent contact between the object and the moving implement if a ratio corresponding to the first identified reflectance level and the second identified reflectance level exceeds a predetermined threshold.

主权项

1. A power tool comprising:
an implement; an actuator configured to move the implement during operation of the power tool; an implement arrest mechanism; a first emitter configured to emit light at a wavelength between 800 nm and 1100 nm; a second emitter configured to emit light at a wavelength between 1350 nm and 1800 nm; a photodetector configured to receive a reflection signal from an object that receives the light from the first emitter and the second emitter; and a controller operatively connected to the actuator, the implement arrest mechanism, the first emitter, the second emitter, and the photodetector, the controller being configured to:
operate the actuator to move the implement;activate only the first emitter;identify a first reflectance level from the object with reference to a first reflection signal received by the photodetector when only the first emitter is activated;activate only the second emitter;identify a second reflectance level from the object with reference to a second reflection signal received by the photodetector when only the second emitter is activated; andactivate the implement arrest mechanism to prevent contact between the object and the implement while the implement is in motion in response to a ratio corresponding to the first identified reflectance level and the second identified reflectance level exceeding a first predetermined threshold.