Browse Prior Art Database

Differential Electron-Acoustic Imaging

IP.com Disclosure Number: IPCOM000045911D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Coufal, H: AUTHOR [+3]

Abstract

A differential electron-acoustic image detection system uses a pair of deflection plates to modulate the position of the beam. The deflection plates superimpose a small oscillatory motion of the beam on the deflection voltage that is used to scan the beam.

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Differential Electron-Acoustic Imaging

A differential electron-acoustic image detection system uses a pair of deflection plates to modulate the position of the beam. The deflection plates superimpose a small oscillatory motion of the beam on the deflection voltage that is used to scan the beam.

As shown in the drawing, the system has an electron beam 10 which passes through a pair of deflection plates 12A and 12B which modulate the position of the beam between 10A and 10B. Thermal waves are created in the sample 16 within this modulation when the beam strikes an inhomogeneity 18. These thermal waves induce sound waves which strike a piezoelectric transducer 20, causing a signal 22. Since signals are only caused by inhomogeneities and since the background signal is small, the contrast of the electron-acoustic image created by this differential technique is substantially greater than prior-art techniques.

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