Apparatus and method for determining the mass density of a filam

Details Apparatus and method for determining the mass density of a filam Apparatus and method for determining the mass density of a filam

1994-09-29

1997-12-09

Dougherty, Elizabeth L.

Measuring and testing

Sheet, woven fabric or fiber

Filament

73159, G01L 504

Patent

active

056948077

ABSTRACT:
A method and apparatus for determining the mass density of a moving filament is provided. The method includes the steps of providing a filament across two supports, tensioning the filament, inducing a vibration into the filament segment between the supports, reinforcing the vibration using an amplified feedback signal, detecting the vibrational frequency data, processing the data using a fast-fourier transform analysis, and then displaying the frequency. The use of the feedback signal results in a self-tuning resonant loop. Open loop versions may also be used. The apparatus includes a base supporting a fixed support and a transducer which in turn supports a moveable support. The transducer vibrates the moveable support transversely to the direction of travel of the filament, thereby inducing a transverse vibrational mode. The output of the transducer is amplified and used to drive a second amplifier to produce a self-tuning resonant loop. In the open loop version a signal generator is used to drive the transducer through a frequency range, during which the amplitude peak is identified.

REFERENCES:
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patent: 4610707 (1986-09-01), Grundy
patent: 4764876 (1988-08-01), Whitener et al.
patent: 4953400 (1990-09-01), Bossuyt
patent: 5146550 (1992-09-01), Furter et al.
patent: 5270787 (1993-12-01), Shofner et al.

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