Soundless Submarines Are Closing In
A cloaking technology that bends sound waves could render submarines and other underwater objects undetectable to sonar or ultrasound sensors. The technique, developed by researchers at the University of Illinois, employs a highly engineered “metamaterial” to bend the waves around an object, much as light is bent to make objects invisible.
Stealth submarines are an obvious potential military application for acoustic cloaking, but the researchers also see possible medical applications, since many medical scans rely on sound waves. The metamaterial could theoretically be used in a bandage that would curb disruption or interference from other body parts that sometimes interfere with ultrasound scanning, thus making these scans more accurate.
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