Abstract: A continuous liquid level fiber optic sensor has been devised, developed, and tested. The sensor is based on two coupled light-diffusing glass fibers. The light from a laser diode is ...

Dermatologists explain the science behind wildly popular treatments like red light therapy, which is now available at home—for a steep price. Full-face LED masks like this one can cost up to several ...

I SUPPOSE that everyone is familiar with the beautifully graded illumination of a paraffin candle, extending downwards from the flame to a distance of several inches. The thing is seen at its best ...