# Bridge displacement measurement

###### Doeh 682 datasheet 2n3904

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Displacement is a vector measure of the interval between two locations measured along the shortest path connecting them. How far does the Earth travel in one year? In terms of distance, quite far (the circumference of the Earth's orbit is nearly one trillion meters), but in terms of displacement, not far at all (in some respects, zero). Free response measurements of a prototype bridge (estimated mass of 500kg) shows that after six cycles the amplitude of the displacement is 10% of the first amplitude. The time for these six cycles to occur was measured to be 30 seconds. With the bridge modeled as a mass-spring-damper system, estimate the damping coefficient b and stiffness k. Micro-Measurements Linear Displacement Sensor uses a fully active 350 Ohm strain-gauge bridge to sense spindle displacement, giving infinite resolution and excellent linearity. Linear Displacement Sensor is compatible with all standard strain-gauge instrumentation with bridge excitation from 2 to 10 volts. the dynamic deformation of bridges. For this a much higher data rate is needed. GPS needs a clear line of site to the satellites and so for bridge monitoring can only measure from the bridge deck and towers. Even on the bridge deck the cable and towers can cause obstructions to the signals.