Patent ID: 8482408
Filing Date: 2013-07-09
Classification: G01H

Abstract:
1. A system for inspecting operating vehicles at a security checkpoint, said checkpoint having a desired throughput and a threat level, said vehicles having at least one compartment, said system comprising: at least one means for measuring vehicle vibrations generated by said compartment, said vehicle vibrations being caused the operation of said vehicle, said vehicle vibrations being measured from outside of said vehicle, said vehicle vibrations having a plurality of vehicle frequency spectral peaks and a vehicle low frequency band; a database of predetermined reference vibrations, said reference vibrations corresponding to said vehicles having said compartments that have not been modified, said reference vibrations being caused by the operation of said vehicles, said reference vibrations having a plurality of reference frequency spectral peaks and a reference low frequency band; a processor for comparing said vehicle vibrations to said reference vibrations for detecting an anomaly in said non-machinery components, said anomaly being deemed to exist when said vehicle frequency spectral peaks and said reference frequency spectral peaks differ more than a predetermined amount, and when said vehicle low frequency band amplitude is less than said reference low frequency band by a predetermined amount; and, said processor adjusting said spectral peak predetermined amount and said frequency band predetermined amount according to said throughput and said threat level.