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A semiconductor detector is a device that uses a semiconductor (usually silicon or germanium) to detect traversing charged particles or the absorption of photons. In the field of particle physics, these detectors are usually known as silicon detectors.
Two types of magnetic field sensors are used for traffic flow parameter measurement, the two-axis fluxgate magnetometer (that detects stopped and moving vehicles) and the magnetic detector, more properly referred to as an induction or search coil magnetometer (that typically detects only moving vehicles).