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coupler

The silicone material, which when attached to the piezoelectric crystal in the sensor, serves as the face of the sensor and is used to amplify the sound wave signal and "push" it through the air. This coupler provides a link that transports the sound energy or signal from the crystal to the outside air. This is necessary because air presents a resistance that would greatly inhibit the sensing range were it not for the boost provided by the silicone coupler.