Measuring and testing – Vibration – By mechanical waves
Patent
1986-12-15
1988-05-24
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
367902, G01B 1702
Patent
active
047458089
ABSTRACT:
Measurement apparatus utilizes a sonar head for sending and receiving sonar signals and the apparatus is calibrated before each measurement by locating the sonar head a fixed, predetermined distance from a stationary target. Movement of the sonar head is accomplished by a stepper motor and lead screw arrangement to position the sonar head the same, predetermined distance from the element to be measured as it was originally placed for calibration, and the difference between the calibration distance and the second distance is from a target motor and lead screw arrangement to position the sonar head the same, predetermined distance from the element to be measured as it was originally placed for calibration, and the difference between the calibration distance and the second distance is translated into a distance representing the desired measurement.
REFERENCES:
patent: 2661714 (1951-10-01), Greenwood et al.
patent: 3108469 (1963-10-01), Dyer et al.
patent: 4356439 (1982-10-01), Mott et al.
patent: 4528491 (1985-07-01), Takeuchi et al.
Bell Robert P.
Levy Stewart J.
Shields H. Gordon
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