Surveillance system

Details Surveillance system Surveillance system

1992-06-29

1995-05-02

Ramirez, Ellis B.

Boots, shoes, and leggings

73862333, 73862474, G01L 100

Patent

active

054125820

ABSTRACT:
The present invention relates to a surveillance system for measuring and surveying e.g. the preload in screws (23) or similar. It comprises a number of sensor systems (1) electrically connected to a common electronic and computing system, each said sensor system (1) comprising sensor means (2) being provided with a magnetoelastic material (6) sensitive to the preloads and a sensing device (3) comprising a coil system at least partly surrounding the sensitive material (6). The sensitive material (6) is excited via the coil system with a frequency of at least 300 kHz so as to make the system insensitive to external disturbing fields.

REFERENCES:
patent: 3187433 (1965-02-01), Even
patent: 4106176 (1978-08-01), Rice et al.
patent: 4114428 (1978-09-01), Popenoe
patent: 4768388 (1988-09-01), Fader et al.
patent: 4882936 (1989-11-01), Garshelis
patent: 4969105 (1990-11-01), Gaensle
patent: 5257207 (1993-10-01), Warren
Sassada et al.; "A New Method of Assembling a Torque Transducer by the Use of Bilayer-Structure Amorphous Ribbons"; IEEE Transactions on Magnetics, vol. 19, No. 5, Sep. 1983.

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