Measuring and testing – Vibration – By mechanical waves
Patent
1976-12-23
1977-12-13
Queisser, Richard C.
Measuring and testing
Vibration
By mechanical waves
73579, 73 88F, G01N 2900
Patent
active
040622274
ABSTRACT:
This invention is a CW ultrasonic device for measuring frequency shifts of the peak of a mechanical resonance in a body. One application of the device is measuring the strain in a bolt. It also has other applications such, for example, as measuring the thickness of a body, measuring the depth of a flaw in a body, measuring the elongation of body and measuring changes in velocity of sound in a body. The body is connected, by means of a CW transducer, to electrical circuit means including a narrow band RF amplifier to form a closed loop feedback marginal oscillator that frequency locks the device to the peak of a mechanical resonance in the body. Thereafter, when the frequency of this peak changes, because of a physical change in the body, the frequency of the oscillator changes. The device includes an automatic frequency resonant peak tracker that produces a voltage that is related to a change in frequency of the oscillator. This voltage is applied to the RF amplifier to change the center of its frequency band to include the frequency of the peak and is a measure of the frequency shift. The device also includes a special transducer which requires contact to only one side of the body and provides high electrical isolation between its parts.
REFERENCES:
patent: 3306100 (1967-02-01), Wilhelm et al.
patent: 4015464 (1977-04-01), Miller et al.
Beauchamp John P.
King William H.
Manning John R.
Osborn Howard J.
Queisser Richard C.
LandOfFree
CW ultrasonic bolt tensioning monitor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with CW ultrasonic bolt tensioning monitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CW ultrasonic bolt tensioning monitor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-483505