Patent
Double reference pulsed phase locked loop
Joseph S. Heyman
- 07 Mar 1985
TL;DR: In this article, a double reference pulse phase-locked loop was proposed to measure the phase shift between tone burst signals initially derived from the same periodic signal source (voltage controlled oscillator 16) and delayed by different amounts because of two different paths.
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Abstract: A double reference pulse phase locked loop for measuring the phase shift between tone burst signals initially derived from the same periodic signal source (voltage controlled oscillator 16) and delayed by different amounts because of two different paths A first path is from transducer 12 to surface 14 of sample 11 and back, and a second path is from transducer 12 to surface 15 and back A first pulse phase locked loop including phase detector 26 and phase shifter 22 forces the tone burst signals delayed by the second path in phase quadrature with the periodic signal source A second pulse phase locked loop including phase detector 21 forces the tone burst signals delayed by the first path into phase quadrature with the phase shifted periodic signal source
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Citations
Patent
Method and apparatus for assessment of changes in intracranial pressure
William T. Yost,John H. Cantrell +1 more
- 02 Dec 1999
TL;DR: In this paper, a non-invasive method and apparatus for monitoring changes in intracranial pressure which removes extracranial effects from the measurements was proposed, which can include the supplying of a fixed frequency electrical output to a transducer coupled to the patient's head, thereby generating an acoustical tone burst in the patient head which generates a first echo and a second echo, the first echo reflecting from a first interface in the side of the head coupled to transducers, and the second echo reflected from a second interface at the opposite side of head.
Patent
Ultrasonic material monitor for determining a characteristic of the material
M. J. McKenna,Joseph S. Heyman +1 more
- 24 Jul 2007
TL;DR: In this article, a material characteristic measurement approach is proposed to measure the internal state of a material by measuring the nonlinear shift in velocity induced by different acoustic energies, which can be applied using one or more transducers, and does not require physical contact with the material.
18
Method of wear monitoring using ultrasonic phase comparison
TL;DR: In this article, a method of monitoring the cylinder wall wear using ultrasonic phase comparison techniques is disclosed, which comprises the steps of introducing ultrasonic waves in a cylinder wall so that the waves travel through the cylinder walls.
16
Ultrasonic position sensor for measuring movement of an object
TL;DR: In this article, a position sensor for measuring the distance from a first position to a second position is presented, which includes an elastic wave generator, an acoustical path over which the elastic wave passes, and a transducer to which the wave passes.
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Patent
Radio frequency strain monitor
Joseph S. Heyman,Robert S. Rogowski,Milford S. Holben +2 more
- 07 Jun 1988
TL;DR: In this article, a radio frequency strain monitor includes a voltage controlled oscillator for generating an oscillating signal that is input into a propagation path, and the propagation path is preferably bonded to the surface of a structure to be monitored and produces a propagated signal.
13
References
Patent
Pulsed phase locked loop strain monitor
Joseph S. Heyman
- 23 Oct 1980
TL;DR: In this article, a voltage controlled oscillator (VCO) is periodically gated by gate 15 to a transducer 18 which produces acoustic waves in bolt 19 and then the reflected acoustic waves are converted to electrical signals by gate 20 to mixer 31.
Patent
Ultrasonic system for measuring dimensional or stress change in structural member
John F. Moore,Forrest M. Coate +1 more
- 01 Apr 1976
TL;DR: In this paper, a VCO is employed with a digital counter to time the period between paired pulses, the interval between successive paired pulses and the time of a predetermined number of pulse pairs, which is used to alternatively shift the frequency of the VCO high and low to cause the first echo of the second pulse to be offset in phase from the coincidence position it might have at the central frequency.
45
Patent
Method and apparatus for measuring time interval between two pulse signals
Walter Dipl Ing Mohr
- 26 Oct 1976
TL;DR: The time interval between two consecutive pulse signals, as occurring for instance in nondestructive ultrasonic pulse-echo testing, is measured by measuring with a counting frequency the width of the interval start pulse signal and width of interval stop pulse signal at respective base lines as discussed by the authors.
22
Patent
Apparatus for locating interfaces in media
Robert James Redding
- 02 Oct 1980
TL;DR: In this article, a phase-locked loop is used to detect and locate inhomogeneity in a medium consisting of a transducer to transmit frequency-modulated ultrasonic energy through the medium and a transducers to receive reflected energy.
17
Patent
Bolt load determining apparatus
Gene E. Olson,Donald D. Grover,Christopher B. Stout,Thomas P. Becker,Glenn A. Kaufman,Norbert J. Kot +5 more
- 26 Jan 1982
TL;DR: In this paper, a first signal at a first frequency which is a selected harmonic of the resonant frequency of a bolt in a first loaded condition is determined, and a second signal at the second frequency being the same harmonics of the bolt in the second loaded condition.
13
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