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- http://en.wikipedia.org/wiki/Ultrasonic_sensor
- http://www.ehow.com/how-does_4947693_ultrasonic-sensors-work.html?ref=Track2&utm_source=ask
- http://www.education.rec.ri.cmu.edu/products/nxt_video_trainer2/resources/helpers/nxt_sensors/ultrasonic.html
Position sensors characteristics comparison
Electret microphone
| Property | Nonlinear |
|---|---|
| Sensitivity(- 46 ± 2.0, ( 0 dB = 1V / Pa ) at 1K Hz) | Nonlinear function |
| Input span (db min ... db max) | |
| Full-scale output(50-10000(Hz)) | |
| Output impedance | |
| Output format | |
| Dynamic |