Browse Prior Art Database

Ultrasonic Sensing by Ceramic Transducers

IP.com Disclosure Number: IPCOM000092645D
Original Publication Date: 1967-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Delaney, RA: AUTHOR [+3]

Abstract

This ultrasonic card sensing device utilizes laminated ceramic green sheets, adjacently positioned and resonantly tuned.

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Ultrasonic Sensing by Ceramic Transducers

This ultrasonic card sensing device utilizes laminated ceramic green sheets, adjacently positioned and resonantly tuned.

The transmitter is composed of layers of ceramic green sheets shaped to contain banks of localized parabolic sites. The receiver is a mirror image and is aligned above the transmitter. The transmitter, when excited by a sinusoidal signal, emits energy waves in the form of an air column.

Upon the presence of a hole in a card passing between the transmitter and receiver, the air column is permitted to acoustically excite the receiver site producing an output signal.

Drawing B is a modified ceramic green sheet arrangement. The sensors are in the shape of slotted bimorph tabs.

The transmitter, metallized on three sides, generates excitation signals.

The cup-shape reflectors are formed of ceramic green sheets for purposes of both channeling the signal and isolating each individual sensor site.

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