Ultrasonic microscope having a focusing mechanism

Details Ultrasonic microscope having a focusing mechanism Ultrasonic microscope having a focusing mechanism

1989-07-14

1990-12-18

Chapman, John

Measuring and testing

Vibration

By mechanical waves

73620, G01N 2900

Patent

active

049777793

ABSTRACT:
An ultrasonic microscope includes a housing for containing a cryogenic liquid. A sample support mechanism is secured to a frame inside the housing, and an acoustic lens located in the housing in the cryogenic liquid applies an ultrasonic beam to the sample supported by the support mechanism. A voice coil device suported by the frame operates to move the sample support mechanism in response to a drive current, and to fix a distance between the acoustic lens and the sample. A control arrangement associated with the voice coil device generates an EMF in response to movement of the support mechanism, and supplies a current caused by the EMF to the drive circuit wherein movement of the support mechanism is controlled by the current to maintain the sample at a desired position with respect to the acoustic lens.

REFERENCES:
The Journal of Acoustic Society of America, vol. 67 (May, 1980), pp. 1629-1637--J. Heiserman et al., "Cryogenic Acoustic Microscopy".
D. Ruger et al., "Acoustic Microscopy at Temperaturess less than 0.2.degree. K.," Acoustical Imaging, vol. 12 (1982), pp. 13-25.

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