초록 ▼

A bridge monitoring system uses laser light reflected from structural members of a bridge to create velocity and displacement time signals of the bridge's vibratory response to quiescent conditions, and converts the sensed velocity and displacement time data to frequency domain data to provide a "si

A bridge monitoring system uses laser light reflected from structural members of a bridge to create velocity and displacement time signals of the bridge's vibratory response to quiescent conditions, and converts the sensed velocity and displacement time data to frequency domain data to provide a "signature" waveform for the bridge indicative of its structural characteristics.

대표청구항 ▼

[ We claim:] [1.]1. Apparatus for monitoring a vibratory state of structural members of a bridge in response to quiescent bridge conditions, comprisinga laser light source producing a single laser light beam;a 1:N splitter forming a plurality of individual laser light beams from said single laser li

[ We claim:] [1.]1. Apparatus for monitoring a vibratory state of structural members of a bridge in response to quiescent bridge conditions, comprisinga laser light source producing a single laser light beam;a 1:N splitter forming a plurality of individual laser light beams from said single laser light beam, wherein each individual laser light beam in said plurality thereof is directed to illuminate a target area within a plurality of target areas on the surface of each of one or more individual bridge structural elements for a period of time;detector means, for receiving a reflection of said individual laser light beam from each said target area to provide individual velocity time signals indicative of surface deflections of said individual target areas in said period of time; andsignal processing means, connected for response to said detector means for converting each said velocity time signal into a corresponding frequency domain signal, to identify quiescent frequency response characteristics of an associated structural element.