Method and apparatus for noncontacting tension measurement in a

Details Method and apparatus for noncontacting tension measurement in a Method and apparatus for noncontacting tension measurement in a

1987-06-04

1989-05-30

Noland, Tom

Measuring and testing

Dynamometers

Responsive to force

7386241, 73655, G01L 510

Patent

active

048339288

ABSTRACT:
A method and apparatus for measuring the tension of a thin, plane membrane (1). In accordance with the method, a burst of a membrane wave (2) is generated by a transducer element (3) e.g. a loudspeaker (3). The velocity of the membrane wave (2) is measured. The velocity measurement value of the membrane wave (2) is squared and multiplied by the basis weight of the membrane (1) in order to determine the tension. According to the invention, a light beam (10) is generated by at least one light emitting element (5), each light beam (10) is projected with help of projecting members (6 or 14, 15, 17) onto the membrane (1) in order to generate a light spot (4 or 19), the light spot (4 or 19) vibrating on the membrane (1) is converted into an electrical signal dependent on the position of the light spot (19) by means of at least one detector element (8 or 18 ) in order to determine the membrane wave (2) and the signal is processed in a processor (9) in order to determine the velocity of the membrane wave (2). With help of the invention, the tension of a plane membrane (1) can be measured reliably without contact to the membrane.

REFERENCES:
patent: 3850031 (1974-11-01), Schwenzfeier et al.
patent: 3854325 (1974-12-01), Coate
patent: 3854329 (1974-12-01), Jones
patent: 3882718 (1975-05-01), Kriebel
patent: 4335603 (1982-06-01), Locke
patent: 4501642 (1985-02-01), Wells
patent: 4568414 (1986-02-01), Oldis et al.
"An Absolute Method of Calibrating Ultrasonic Transducers Using Laser Interferometry"; Conference: Conference on the Evaluation and Calibration of Ultrasonic Transducers, London, England (11-12, May 1977), pp. 106-114; J. H. Speake.

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