Arrangement for measuring mechanical properties of a foil materi

Details Arrangement for measuring mechanical properties of a foil materi Arrangement for measuring mechanical properties of a foil materi

1993-11-10

1994-11-08

Williams, Hezron E.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73159, 356432, 356373, G01L 124

Patent

active

053616383

ABSTRACT:
An arrangement for measuring mechanical properties of foil material (10), preferably paper. The arrangement includes a material excitation unit (12) and a material sensing detection unit (14). The two units are connected electrically to a common arithmetical unit (18). This unit is intended to register and convert electrical signals deriving from the two first mentioned units (12, 14) in a manner to produce final signals which represent the material properties to be measured. The excitation unit (12) includes a laser which, through electromagnetic radiation, is intended to generate in the gaseous atmosphere surrounding the material local transient gas-pressure pulses within variable surface zones which are well-defined geometrically, without the excitation unit coming into contact with the material. These gas pressure pulses cause the material (10) to stretch locally in the boundary regions of the zones, such stretching of the material being necessary to the measuring process. The detection unit (14) senses this stretching of the material, without coming into contact with the material, by detecting transient changes in these material zones.

REFERENCES:
patent: 3605486 (1971-09-01), Anderholm et al.
patent: 4246793 (1981-01-01), Fairand et al.
patent: 4622853 (1986-11-01), Leugers
patent: 4632561 (1986-12-01), Rosencwaig et al.
patent: 4952063 (1990-08-01), Opsal et al.
patent: 5025665 (1991-06-01), Keyes, IV et al.

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