| 摘要 |
PCT No. PCT/GB80/00089 Sec. 371 Date Jan. 23, 1981 Sec. 102(e) Date Jan. 23, 1981 PCT Filed May 15, 1980 PCT Pub. No. WO80/02594 PCT Pub. Date Nov. 27, 1980.A scanning acoustic microscope comprises transducer means (10, 12, 14) to provide a convergent beam of acoustic radiation; means (20, 22) to cause relative movement in the focal plane of the focus of the beam and a sample (16); transducer means (10, 12, 14) to receive acoustic radiation modulated by the sample near the beam focus; and means (30) to supply a pressurized gas to a volume surrounding the transducer means and the sample.
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