G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 3/32 (2006.01) G01N 3/30 (2006.01) G01N 29/24 (2006.01) G01N 33/34 (2006.01) G01N 3/00 (2006.01) G01N 3/02 (2006.01)
Patent
CA 2056399
An arrangement for measuring mechanical propert- ies of foil material (10), prefer- ably paper. The arrangement includes a material excitation unit (12) and a material sen- sing detection unit (14). The two units are connected electri- cally to a common arithmetical unit (18). This unit is intended to register and convert electri- cal signals deriving from the two first mentioned units (12, 14) in a manner to produce fi- nal signals which represent the material properties to be mea- sured. The excitation unit (12) includes a laser which, through electromagnetic radiation, is intended to generate in the gaseous atmosphere surround- ing the material local transient gas-pressure pulses within var- iable 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 measur- ing process. The detection unit (14) senses this stretching of the material, without coming into contact with the material, by detec- tingtransient changes in these material zones.
Anttila Jorma
Pettersson Thorulf
Fetherstonhaugh & Co.
Stfi
LandOfFree
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