Method and apparatus for measuring the percentage of elongation of metal strips

Claim 1

A method of measuring the percentage of elongation of a rolled metal strip comprising the steps of disposing a plurality of detecting means aloNg a line parallel to the direction of movement of said metal strip, said measuring means being spaced from each other by a predetermined definite spacing and disposed close to but not in contact with the surface of said strip to produce first signals representing the distances between respective measuring means and portions of said surface of said strip opposing said measuring means, producing second signals corresponding to the difference between output signals of pairs of adjacent detecting means, squaring said difference signals and adding said squared difference signals to produce a third signal representing the percentage of elongation of said metal strip over a length along which said plurality of measuring means are disposed.

Claim 2

A method of measuring the percentage of elongation of a rolled metal strip comprising the steps of disposing a plurality of detecting means aloNg a line parallel to the direction of movement of said metal strip, said measuring means being spaced from each other by a predetermined definite spacing and disposed close to but not in contact with the surface of said strip to produce first signals representing the distances between respective measuring means and portions of said surface of said strip opposing said measuring means, producing second signals corresponding to the difference between output signals of pairs of adjacent detecting means, squaring said difference signals and adding said squared difference signals to produce a third signal representing the percentage of elongation of said metal strip over a length along which said plurality of measuring means are disposed.

Claim 7

An apparatus for measuring the percentage of elongation of a rolled strip mill comprising a plurality of detecting means disposed along a line parallel to the direction of movement of said metal strip, said detecting means being spaced from each other by a predetermined definite spacing and disposed close to but not in contact with the surface of said strip to produce first signals representing the distances between respective measuring means and portions of said surface of said metal strip opposing said measuring means, means to produce second signals corresponding to the difference between output signals of pairs of adjacent detecting means, squaring circuits to square said difference signals and means to add said squared difference signals to produce a third signal representing the percentage of elongation of a metal strip over a length along which said plurality of measuring means are disposed.

Claim 8

An apparatus for measuring the percentage of elongation of a rolled strip mill comprising a plurality of detecting means disposed along a line parallel to the direction of movement of said metal strip, said detecting means being spaced from each other by a predetermined definite spacing and disposed close to but not in contact with the surface of said strip to produce first signals representing the distances between respective measuring means and portions of said surface of said metal strip opposing said measuring means, means to produce second signals corresponding to the difference between output signals of pairs of adjacent detecting means, squaring circuits to square said difference signals and means to add said squared difference signals to produce a third signal representing the percentage of elongation of a metal strip over a length along which said plurality of measuring means are disposed.

Claim 9

An apparatus for measuring the percentage of elongation of a rolled magnetic metal strip comprising a plurality of magnetic detectors disposed along a line parallel to the direction of movement of said metal strip; each one of said magnetic detectors including a magnetic core and a coil and disposed close to but not in contact with the surface of said metal strip so as to produce a first signal representing the distance between said magnetic core and the portion of said metal strip facing thereto; nonlinear circuits connected to said magnetic detectors to linearize the outputs thereof; a plurality of subtracting circuits to produce difference signals respectively corresponding to the difference between outputs of pairs of adjacent nonlinear circuits; squaring circuits to square respective one of said second signals and an addition circuit to sum up said squared difference signals to produce a third signal representing the percentage of elongation of said metal strip.

Claim 10

An apparatus for measuring the percentage of elongation of a rolled magnetic metal strip comprising a plurality of magnetic detectors disposed along a line parallel to the direction of movement of said metal strip; each one of said magnetic detectors including a magnetic core and a coil and disposed close to but not in contact with the surface of said metal strip so as to produce a first signal representing the distance between said magnetic core and the portion of said metal strip facing thereto; nonlinear circuits connected to said magnetic detectors to linearize the outputs thereof; a plurality of subtracting circuits to produce difference signals respectively corresponding to the difference between outputs of pairs of adjacent nonlinear circuits; squaring circuits to square respective one of said second signals and an addition circuit to sum up said squared difference signals to produce a third signal representing the percentage of elongation of said metal strip.

Claim 11

An apparatus for measuring the percentage of elongation of a rolled magnetic metal strip comprising a plurality of ultrasonic detectors disposed along a line parallel to the direction of movement of said metal strip; said ultrasonic detectors being disposed close to but not in contact with the surface of said metal strip; said ultrasonic detectors transmitting ultrasonic pulse waves towarD the surface of said metal strip and receiving ultrasonic pulse waves reflected thereby so as to produce first signals representing the distances between said detectors and corresponding portions of the surface of said metal strip; a pulse source energizing said ultrasonic detectors; integrating circuits controlled by the output from said pulse source to respectively integrate said first signals; a plurality of subtracting circuits to produce difference signals respectively corresponding to the difference between outputs of pairs of adjacent integrating circuits; squaring circuits to square outputs from said subtracting circuits; and an addition circuit to sum up outputs from said squaring circuits to produce a third signal representing the percentage of elongation of said metal strip.

Claim 12

An apparatus for measuring the percentage of elongation of a rolled magnetic metal strip comprising a plurality of ultrasonic detectors disposed along a line parallel to the direction of movement of said metal strip; said ultrasonic detectors being disposed close to but not in contact with the surface of said metal strip; said ultrasonic detectors transmitting ultrasonic pulse waves towarD the surface of said metal strip and receiving ultrasonic pulse waves reflected thereby so as to produce first signals representing the distances between said detectors and corresponding portions of the surface of said metal strip; a pulse source energizing said ultrasonic detectors; integrating circuits controlled by the output from said pulse source to respectively integrate said first signals; a plurality of subtracting circuits to produce difference signals respectively corresponding to the difference between outputs of pairs of adjacent integrating circuits; squaring circuits to square outputs from said subtracting circuits; and an addition circuit to sum up outputs from said squaring circuits to produce a third signal representing the percentage of elongation of said metal strip.