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Browse Prior Art Database

Distance Measuring Apparatus

IP.com Disclosure Number: IPCOM000096685D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Young, DR: AUTHOR

Abstract

This apparatus employs ultrasonic energy to determine precise distances of the order of mils. Rod 20 is suspended between fixed points 22 and 24. Rod 20 is magnetic for cooperation with a sine wave generator 26. A sinusoidal current is supplied by generator 26 to transducer 28 encompassing part of rod 20. The frequency of the current establishes traveling ultrasonic waves in rod 20. The waves travel toward fixed point 24 which is arranged to provide damping of them. The distance along the rod is precisely determined by several alternatives.

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Distance Measuring Apparatus

This apparatus employs ultrasonic energy to determine precise distances of the order of mils. Rod 20 is suspended between fixed points 22 and 24. Rod 20 is magnetic for cooperation with a sine wave generator 26. A sinusoidal current is supplied by generator 26 to transducer 28 encompassing part of rod 20. The frequency of the current establishes traveling ultrasonic waves in rod 20. The waves travel toward fixed point 24 which is arranged to provide damping of them. The distance along the rod is precisely determined by several alternatives.

In one arrangement, phase detector 36 receives as a first input a signal detected by movable transducer 34 due to the ultrasonic waves in rod 20. Detector 36 receives as a second input the output from generator 26. The transducer input to the detector varies according to the position along the rod. The transducer input at certain positions are in phase with the generator input. At other positions, the transducer input is in phase opposition to the generator input. Intermediate positions have proportional phase differences. The detector, therefore provides an amplitude output according to the transducer position. The amplitude can be converted into a corresponding rod distance by apparatus, not shown. When the transducer is mechanically attached to a lathe or a milling machine, detector 36 records the transducer movement to the order of mils for rod wave velocities of 3 x 10(3) millimeters per secon...