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Noninvasive vibration measurement system and method for measuring amplitude of vibration of tissue in an object being investigated

  • US 4,819,649 A
  • Filed: 11/03/1986
  • Issued: 04/11/1989
  • Est. Priority Date: 11/03/1986
  • Status: Expired due to Term
First Claim
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1. The method of investigating an acoustically vibrating object which comprises the steps of obtaining an acoustically vibrating object, transmitting a focused beam of ultrasonic continuous wave energy along one axis into the object, receiving a focused beam of reflected ultrasonic energy along a second axis from the object, intersecting the axes of the transmitted and received beams such that the beams at the intersection of their axes define a small, concentrated spot within the object, relatively positioning the object under investigation and the concentrated spot so that the received beam is phase modulated by the vibration of the object, the modulated received beam including a carrier and sidebands and determining the amplitude of vibration of the object from the phase modulation of the received beam.

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