Leighton T G, Pickworth M J, Tudor J, Dendy P P
Cavendish Laboratory, Cambridge, UK.
Ultrasonics. 1990 May;28(3):181-4. doi: 10.1016/0041-624x(90)90083-z.
In a previous experiment, sonoluminescence was observed in aerated water, especially at the pressure antinodes in the standing-wave field of a physiotherapeutic ultrasound device (Therasonic 1030). Mammalian cells in vitro showed growth inhibition when placed at the pressure antinodes but not at adjacent pressure nodes. In the light of these results, we looked for sonoluminescence in vivo when a similar standing-wave field was set up. To detect luminescence, a light guide was held against the inner surface of the human cheek. This would channel any luminescence photons to a cooled, red-sensitive photomultiplier which would quantify the light. Direct insonation of the cheek produced no detectable luminescence. Similarly when a water bag was placed against the outer surface of the cheek, and the latter was insonated through the bag, no luminescence was detected. Sonoluminescence from the water bag was, however, detected when the bag was placed against the inner surface of the cheek, showing that absorption of sound by the cheek tissue was not preventing cavitation. Further analysis showed that if cavitation had been occurring in the cheek without detection using the system employed, then the resulting sonoluminescence would have to be at most 0.025 times as intense as that produced by an equivalent volume of aerated water.
在之前的一项实验中，在曝气水中观察到了声致发光现象，尤其是在理疗超声设备（Therasonic 1030）驻波场中的压力波腹处。体外培养的哺乳动物细胞置于压力波腹处时生长受到抑制，但置于相邻的压力波节处时则不受影响。鉴于这些结果，当建立起类似的驻波场时，我们在体内寻找声致发光现象。为了检测发光，将一根光导纤维紧贴在人脸颊的内表面。这会将任何发光光子引导至一个冷却的、对红光敏感的光电倍增管，该光电倍增管会对光进行量化。直接对脸颊进行超声照射未检测到可察觉的发光。同样，当将一个水袋贴在脸颊的外表面，然后通过水袋对脸颊进行超声照射时，也未检测到发光。然而，当水袋贴在脸颊的内表面时，检测到了来自水袋的声致发光，这表明脸颊组织对声音的吸收并未阻止空化现象。进一步分析表明，如果在脸颊中发生了空化现象而使用所采用的系统未检测到，那么产生的声致发光强度最多只能是等量曝气水产生的声致发光强度的0.025倍。
