Phys.org January 19, 2022 Laser-induced graphene (LIG) can be patterned on a variety of substrates using a laser scriber/cutter. The quality and morphology of LIG is currently analyzed using Raman spectroscopy and electron microscopy. Researchers at Rice University have developed a new method to analyze LIG in real-time during the synthesis using a microphone attached to the laser writing head, followed by a simple acoustic signal processing scheme. They demonstrated that it is possible to use the same energy input to simultaneously drive the conversion process and probe the formation of LIG in situ by applying Fourier and integral analyses, […]
Tag Archives: Acoustic signal processing
Revealing hidden information in sound waves
Phys.org November 29, 2018 Sonar arrays are typically designed to record sounds in specific frequency ranges. Sounds with frequencies higher than an array’s intended range may confuse the system. Researchers at the University of Michigan have developed a technique that will allow just about any signal to be shifted to a frequency range where sonar arrays are no longer confused. It mathematically combines any two frequencies within the signal’s recorded frequency range, to reveal information outside that range at a new, third frequency which is the sum or difference of the two input frequencies. The additional information could boost performance […]