A magnetoresistive three-axis magnetometer was designed, fabricated, characterized and tested with the purpose of detecting vehicles on highways. The magnetoresistive (MR) magnetometer sensor element is a permalloy (NiFe) thin-film deposited on silicon. The sensors are fabricated using equipment similar to integrated circuit manufacturing, so many sensors can be produced on a single silicon wafer. The sensor has three orthogonal sensing axes and uses a 1 kohm permalloy transducer (a Wheatstone-bridge) that uses the 'barber-pole' method of biasing the sensitivity curve. Testing included measurements at in-use roadway test sites. Magnetic signatures of vehicles were collected and post-test analyzed by applying a detection algorithm. Detection accuracy was greater than 99 % for all types of vehicles passing over the detectors. The sensors are low cost and can be packaged with simple electronics to make a low-cost vehicle detector.


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    Titel :

    A solid-state vehicle detector for roadway applications


    Weitere Titelangaben:

    Ein magnetfeldabhängiger Halbleitersensor für das Detektieren von Fahrzeugen auf der Autobahn


    Beteiligte:
    Rouse, G. (Autor:in) / French, H. (Autor:in) / Sasaki, H. (Autor:in) / Kawai, T. (Autor:in)


    Erscheinungsdatum :

    1995


    Format / Umfang :

    6 Seiten, 12 Bilder, 2 Tabellen, 2 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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