Measurement apparatus utilizing sonar waves
First Claim
1. Sonar measurement apparatus for measuring the thickness of a work, comprising, in combination:
- sonar transmitting and receiving means;
reference base means, including a first reference base and a second reference base;
means for moving the sonar transmitting and receiving means linearly with respect to the reference base means to obtain a first predetermined distance measurement before the work to be measured is placed against the reference base means, and then for moving the sonar transmitting means linearly with respect to the work to be measured to obtain a second predetermined measurement distance which is equal to the first predetermined distance measurement, and including means for rotating the sonar means relative to the first reference base and the second reference base to obtain the first predetermined distance from the first reference base and the second predetermined distance from the work disposed against the second reference base; and
means for measuring the distance the sonar transmitting and receiving means moves between the first and second predetermined measurements, which distance represents the thickness of the work.
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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.
14 Citations
15 Claims
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1. Sonar measurement apparatus for measuring the thickness of a work, comprising, in combination:
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sonar transmitting and receiving means; reference base means, including a first reference base and a second reference base; means for moving the sonar transmitting and receiving means linearly with respect to the reference base means to obtain a first predetermined distance measurement before the work to be measured is placed against the reference base means, and then for moving the sonar transmitting means linearly with respect to the work to be measured to obtain a second predetermined measurement distance which is equal to the first predetermined distance measurement, and including means for rotating the sonar means relative to the first reference base and the second reference base to obtain the first predetermined distance from the first reference base and the second predetermined distance from the work disposed against the second reference base; and means for measuring the distance the sonar transmitting and receiving means moves between the first and second predetermined measurements, which distance represents the thickness of the work. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Sonar measurement apparatus for measuring the thickness of a work, comprising, in combination:
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sonar means for transmitting sonar pulses and for receiving reflected sonar pulses; base reference means, including a first reference and a second reference base; means for moving the sonar means relative to the base reference means to obtain a first predetermined distance measurement from the base reference means before the work is placed against the base reference means and for moving the sonar means linearly relative to the work after the work is placed against the base reference means to obtain a second predetermined distance measurement from the work which is equal to the first predetermined distance measurement, and including means for rotating the sonar means relative to the first reference base and the second reference base to obtain the first predetermined distance from the first reference base and the second predetermined distance from the work disposed against the second reference base; and means for measuring the distance moved by the sonar means between the first and second predetermined distance measurements to determine the thickness of the work. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification