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一般把声发光归结为·OH自由基的再复合,而这些自由基是在空化泡崩溃时高温高压下产生的。已知超声治疗仪在水和生物液体中可能会产生大量的自由基,因此在使用时可能会对健康造成危害。本文从实验上在2KHz～1 MHz频段内,对不同频率的驻声波的发光现象进行了研究,发现所观察到的稳定光发射产生于气泡剧烈脉动的空化场,而不是产生于空腔崩溃。在许多情况下,每一声周期内发生多次闪光,而且总是与驱动声压保持一定的位
Acoustic emission is generally attributed to the · OH radical recombination, and these free radicals in the cavitation bubble collapse under high temperature and pressure generated. Ultrasound devices are known to generate large amounts of free radicals in water and biological fluids and may therefore be health hazardous when used. In this paper, we study the luminescence phenomena of standing waves of different frequencies in the frequency range from 2 kHz to 1 MHz experimentally and find that the observed steady-state light emission is generated in the violently pulsating cavitation field of the bubbles rather than in the collapse of the cavity . In many cases, multiple flashes occur per acoustic cycle, and always maintain a certain level of drive sound pressure