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Accuracy class of virtual measuring instruments for textile uses

Gniotek K., Leśnikowski J.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

2000

z. 58

313-321

Every textile material is a porous body. One of the parameters characterising its structure is the tota1 porosity, which is understood as a volume of pores in the unit volume of a porous body. There is a close relationship between the porosity of textile products and their functional qualities such as acoustic, heat-insulating, filtration quality, and the like. Hence, the need for developing a simple, non-invasive method for measuring textile material porosity. The method proposed by the authors [1] is based on the dependence of changes in the suppression of an ultrasound wave passing through a given specimen on the compressive force perpendicular to its surface, which causes the air to be pushed out of the pores. In the device proposed, the specimen to be studied is placed between the transmitting and the receiving ultrasound head and then pressed; at the same time changes in the suppression of the ultrasound wave are recorded. The character of these changes can indicate the magnitude of porosity. One of the most essential elements of the instrument is a force sensor, which bas the form of a beam with four tensometers glued to it, the beam being attached at one end. In the article, the operation of the sensor bas been ana1ysed and its accuracy class determined; in addition, some methods to improve its metrological properties, based on the LabVIEW program have been presented.