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2. Magnetometer - Wikipedia

   en.wikipedia.org/wiki/Magnetometer

   Magnetometers can be used as metal detectors: they can detect only magnetic metals, but can detect such metals at a much greater distance than conventional metal detectors, which rely on conductivity. Magnetometers are capable of detecting large objects, such as cars, at over 10 metres (33 ft), while a conventional metal detector's range is ...

3. Metal detector - Wikipedia

   en.wikipedia.org/wiki/Metal_detector

   U.S. Army soldiers use a military standard metal detector. A metal detector is an instrument that detects the nearby presence of metal. Metal detectors are useful for finding metal objects on the surface, underground, and under water. A metal detector consists of a control box, an adjustable shaft [dubious – discuss], and a variable-shaped ...

4. Magnetic anomaly detector - Wikipedia

   en.wikipedia.org/wiki/Magnetic_anomaly_detector

   A magnetic anomaly detector (MAD) is an instrument used to detect minute variations in the Earth's magnetic field. [1] The term typically refers to magnetometers used by military forces to detect submarines (a mass of ferromagnetic material creates a detectable disturbance in the magnetic field ).

5. Geophysical survey (archaeology) - Wikipedia

   en.wikipedia.org/wiki/Geophysical_survey...

   Metal detectors use electromagnetic induction to detect metal. Although other types of instruments (notably magnetometers and electromagnetic conductivity meters) have some sensitivity to metal, specialized metal detectors are much more effective. Metal detectors are available in different configurations, varying in sophistication and sensitivity.

6. List of sensors - Wikipedia

   en.wikipedia.org/wiki/List_of_sensors

   Magnetic anomaly detector; Magnetometer; ... Metal detector; Planar Hall sensor; Radio direction finder; Test light; ... Superconducting nanowire single-photon detector;

7. MEMS magnetic field sensor - Wikipedia

   en.wikipedia.org/wiki/MEMS_magnetic_field_sensor

   The range of magnetometers based on piezoelectric resonators is mV/T (millivolt/Tesla), so higher responsivity is generally better. [5] Resolution refers to the smallest magnetic field a device can measure. The smaller the number, the more sensitive the device. The range of magnetometers based on piezoelectric resonator is a few nT (nanoTesla). [5]