Method and apparatus for analying traffic and a sensor therefor

Details Method and apparatus for analying traffic and a sensor therefor Method and apparatus for analying traffic and a sensor therefor

1991-09-26

1995-04-18

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

340941, G01R 3304, G08G 1042

Patent

active

054081793

ABSTRACT:
A sensor for detecting a magnetically permeable mass by the disturbance of the earth's magnetic field in the vicinity of the sensor comprises a ferromagnetic strip with a conductive winding wrapped thereabout, a means for magnetically biasing the strip such that regardless of orientation the earth's magnetic field and the strip placing the ferromagnetic strip in a position on its BH curve where the slope is substantially linear, a means for generating an analog signal indicative of the inductance of the winding as the earth's magnetic field is disturbed in the vicinity of the ferromagnetic strip causing a change in the inductance of the winding, a means for digitizing the analog signal at spaced time intervals to produce a series of digitized values, and a digital computer means for processing the digitized signal values to characterize the presence and/or motion of the permeable mass.

REFERENCES:
patent: 2480265 (1949-08-01), Rubenstein
patent: 3001129 (1961-09-01), Knowles
patent: 3246219 (1966-04-01), DeVol et al.
patent: 3458802 (1969-07-01), Koerner
patent: 4052595 (1977-10-01), Erdmann et al.
patent: 4201908 (1980-05-01), Johnson et al.
patent: 4368428 (1983-01-01), Dijkman
patent: 4509131 (1985-04-01), Krasnjanski
patent: 4680717 (1987-07-01), Martin

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