Simon Wray Goodyear,Simon Edward James Collinge,Mark Nicholas Keene
申请号：
US15968413
公开号：
US20180246063A1
申请日:
2018.05.01
申请国别(地区):
US
年份:
2018
代理人:
摘要：
An apparatus for detecting a ferromagnetic object located on or in a person being screened includes a first magnetic sensor which measures an ambient magnetic field or gradient within a first volume of space and produces a corresponding measurement signal, a primary power supply provides power to the magnetic sensor, a signal processing circuit is in communication with the magnetic sensors identifies temporal variations in the measurement signal and from the identified temporal variations provides an output signal indicative of the presence of a ferromagnetic object within the volume of space, and a warning device operable by the output from the signal processing circuit provides in the vicinity of the apparatus an audible and a visible warning in response to the output signal from the signal processing circuit. The apparatus may include a user operable input means that disables the warning device without powering down the magnetic sensors.
