And there was light!

Robert Apfel

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And there was light!

机译：而且有光！

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It took ten years, but on page 402 of this issue Hilgenfeldt et al. are able to explain I the tiny dot of light emanating from a solitary, sonically driven bubble, first observed by Felipe Gaitan in 1989. Gaitan had been adjusting the parameters in his apparatus to study a new regime for acoustically levitating a bubble in water — a technique perfected almost three decades before by his PhD advisor, Lawrence Crum — and was surprised to find the bubble emitting what appeared to be a continuous dot of light. Light from sound, or sonoluminescence, was not a new phenomenon, but never had a single bubble been controlled in such a manner. In fact, after careful observation with an appropriate photodetector Gaitan determined that the light was not in fact continuous, but emitted in an extremely brief burst each acoustic cycle. That's 20,000 flashes per second, or 72 million synchronous flashes of light every hour.

机译：花了十年时间，但在本期的第402页，希尔根费尔特（Hilgenfeldt）等人。能够解释我从一个独立的，由超声波驱动的气泡发出的微小光点，最初是由费利佩·盖坦（Felipe Gaitan）在1989年观察到的。这项技术在他的博士生导师劳伦斯·克鲁姆（Lawrence Crum）之前将近三十年前完善了，他惊讶地发现气泡散发出似乎是连续的光点。声音发出的光或声致发光并不是一个新现象，但从来没有以这种方式控制单个气泡。实际上，在使用适当的光电探测器进行仔细观察之后，盖坦确定该光实际上不是连续的，而是在每个声波循环中以非常短的突发发出。即每秒20,000次闪烁，或每小时7200万次同步闪烁。

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《Nature》 |1999年第6726期|p.378-379|共2页
作者
Robert Apfel;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类自然科学总论;
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7. Report drawn up on behalf of the Committee on Economic and Monetary Affairs on proposals from the Commission of the European Communities to the Council on the elimination of technical barriers to trade in particular, proposals for directives on the approximation of laws of theMember States relating to:safety belts and restraint systems and head restraints of seats of motorvehicles (Doe. 464/74);headlights for motor vehicles emitting an asymmetrical passing beam or adriving beam or both, and to incandescent electric lamps for suchheadlights (Doe. 452/74);side lights, rear lights and stop lights for motor vehicles and their trailers(Doe. 457/74);the rear registration-plate illuminating device of motor vehicles and theirtrailers (Doe. 450/74);towing hooks on motor vehicles (Doe. 462/74);the roll-over protection structures of wheeled agricultural or forestrytractors (Doe. 456/74);the type-approval of motorcycles (Doe. 463/74 );alcoholometers and hydrometers for alcohol and alcohol tables(Doe. 406/74);electromedical equipment and medical X-ray equipment operating at 10to 400 kV (Doe. 453/74);common provisions for constructional plant and equipment; themeasurement of the sound level of constructional plant and equipment;the permissible sound level for pneumatic concrete-breakers andjackhammers (Doe. 454/74); 'appliances using gaseous fuels, safety and control devices for theseappliances and methods for inspecting these appliances and appliancesusing gaseous fuels for the instantaneous production of hot water forsanitary purposes (Doe. 459/74). Working Documents 1974-1975, Document 517/74, 10 March 1975 [O] . 1975

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And there was light!

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