In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 33, No. 5S ( 1994-05-01), p. 3110-
Abstract:
The application of the Fraunhofer diffraction method, which has been developed as a new means to identify long-wavelength plasma waves or fluctuations appearing in plasma nuclear fusion research machines, to the measurement of low-frequency ultrasonic waves propagating in air was theoretically and experimentally examined. It is experimentally demonstrated that a wave with a wave number of about 0.1 to 0.74 mm -1 can be detected by using a visible laser. Such a wave number corresponds to a diffraction angle of 0.6 to 4.3 mdeg, which is much smaller than the standard value measured by the conventional diffraction method. Furthermore, it is shown that if a diverging probe beam is adopted, the wave position can be identified by measuring the spatial phase distribution of the diffracted wave.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.33.3110
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1994
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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