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Magnetometer detectors (Dmgdem)

Definition
Devices that detect changes in the vertical and horizontal components of the earth's magnetic field produced by a ferrous metal vehicle. They detect moving and stopped vehicles and thus provide passage and presence information. (Source: www.tfhrc.gov/its/pubs/06108/01.htm#oth)
Broader Term
Types of detectors (Dmgde)
Related Terms (Hierarchical)
Acoustic detectors (Dmgdeb)
Infrared detectors (Dmgdee)
Loop detectors (Dmgdeh)
Magnetic detectors (Dmgdek)
Microwave detectors (Dmgdeq)
Optical detectors (Dmgdet)
Photodetectors (Dmgdeu)
Proximity detectors (Dmgdew)
Scintillation counters (Dmgdex)
Video imaging detectors (Dmgdey)