Vibroacoustic System for Vibration Testing
First Claim
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1. A method for measuring the mechanical properties of a device, the steps comprising:
- a) producing a first sonic beam and directing the first sonic beam on the device;
b) modulating the first sonic beam with a first drive signal to produce a corresponding force that acts on the device;
c) producing a second sonic beam and directing the second sonic beam on the device;
d) modulating the second sonic beam with a second drive signal to produce a corresponding force that acts on the device; and
e) measuring the mechanical response of the device to the forces acting on it without physically contacting the device in such a manner that would alter its mechanical response.
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Abstract
Forces are applied to a device under test and its mechanical response is measured by a laser vibrometer (50). The forces are applied without making physical contact with the device by producing an acoustical force with an ultrasonic beam (54). One embodiment employs two confocal transducers (56, 58) that produce beams that flood the device. Drive signals modulate the ultrasonic beams to produce the desired forces, and the use on a plurality of ultrasonic beams enable selective excitation of different modes of vibration of the object (7).
35 Citations
23 Claims
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1. A method for measuring the mechanical properties of a device, the steps comprising:
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a) producing a first sonic beam and directing the first sonic beam on the device; b) modulating the first sonic beam with a first drive signal to produce a corresponding force that acts on the device; c) producing a second sonic beam and directing the second sonic beam on the device; d) modulating the second sonic beam with a second drive signal to produce a corresponding force that acts on the device; and e) measuring the mechanical response of the device to the forces acting on it without physically contacting the device in such a manner that would alter its mechanical response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16)
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15. A method for measuring the mechanical properties of a device, the steps comprising:
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a) producing a first ultrasonic beam and directing the first ultrasonic beam on the device; b) modulating the first ultrasonic beam with a first drive signal to produce a corresponding force that acts on the device; c) producing a second ultrasonic beam and directing the second ultrasonic beam on the device; d) modulating the second ultrasonic beam with a second drive signal to produce a corresponding force that acts on the device; and e) measuring the mechanical response of the device to the forces acting on it. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification