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The use of holographic interferometry as a diagnostic tool for liquid & composite dielectric systems

Mechanistic explanations of breakdown in dielectric liquids have relied on fast Schlieren systems to study pre-breakdown streamers & the Kerr effect [1] to evaluate the field distribution. Holography has previously been used to suppress the incoherent light resulting from dielectric breakdown [2]. The present contribution describes the application of holographic interferometry to obtain an optical probe of greater sensitivity and indicates possible applications. The use of holography permits the detection of phase shifts in a stressed liquid which are only a small fraction of the wavelength of light & allows this increased sensitivity in spite of the inherent poor optical quality of the test liquid, enclosure & arbitrary interfaces present.