Ga. Budenkov et al., ULTRASONIC DIAGNOSIS WITH ATMOSPHERIC AIR AS THE INTERMEDIATE MEDIUM, Russian journal of nondestructive testing, 32(10), 1996, pp. 753-756
It is possible to use atmospheric air as the intermediate medium in no
ndestructive testing and acoustic diagnosis in the low-frequency ultra
sonic range. The main design features are described for low-frequency,
probes. Basic technical data are given on the Germes-2 ultrasonic ins
trument together with uses.