Where to Place a Fiducial Marker in SHM Systems?

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The optimal placement for a fiducial marker in a mass on a spring system and a simple pendulum is crucial for accurate measurements. For the simple pendulum, it is suggested to place the marker below the bob at its equilibrium position, as this is where the bob achieves maximum speed and minimal transit time. Concerns are raised about placing the marker too close to the suspension point, where movement is minimal, potentially leading to inaccurate data. The discussion emphasizes the need to balance marker placement for effective tracking without interference. Proper positioning enhances the effectiveness of structural health monitoring (SHM) systems.
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Homework Statement


Where would be the perfect place to place a fiducial marker in a: mass on a spring system (vertical) and a simple pendulum?

Homework Equations

The Attempt at a Solution



My teacher told me that for a simple pendulum it would be below the bob at equillibrium position because this is the point where the bob has its max. speed or the transit time is the smallest

But I have no idea why this would mean that the below the bob would be better then anywhere else
 
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Wouldn't it interfere if it was placed anywhere else?
 
If you put the mark right below the suspension point, there would be virtually no movement at all. If you want to maximise the movement, you need to be near (even beyond) the bob.
 

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