Sonar und GPS (satellite navigation): was sie gemeinsam haben

1. Schritt 1. Sonar — nutzt — Piezoelectric effect. Langevin’s transducer is piezoelectric quartz.
2. Schritt 2. Piezoelectric effect — wird verwendet in — Quartz clock. The quartz resonator vibrates thanks to the piezoelectric effect.
3. Schritt 3. Quartz clock — entwickelte sich zu — Atomuhr. The quartz oscillator is tuned to an atomic standard.
4. Schritt 4. Atomuhr — wird verwendet in — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.

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