The next step in moving this technology to the field is to develop a portable tripod-based system that houses both the laser source and the IR camera.

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Laser, light source and radiofrequency treatments.

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Plugging the proposals into a spreadsheet, he started listing the tools needed to produce each one: A CNC milling machine for an updated, open-source letterpress printer, a laser cutter for a sensor warning pilots of nearby planes.

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And since ultrasound travels in a tight line akin to laser light, the emergent tones are audible only in a narrow, cylindrical path from source to ear.

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In March 2012 Adam Gardenhire aimed a green laser pen at a business jet and then shone it at a Pasadena police helicopter sent to find the source.

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