This post will clear what I have promised you to explain in my previous post on seismic waves. Just continue to gain knowledge.
What is a Seismograph?
Seismograph Is the sensor device used to amplify and detect ground vibrations. Sometimes the word Seismometer is used to infer the same device.
How does a Seismograph work?
Principle used by the Seismometers, is that It works by "Inertia principle" . The most common is by using a mass suspended by a spring. This mass follows the motion of the ground (although in the opposite direction). This motion can then be converted to an electric current by having the mass be an (electro-) magnet inside the core of a coil, i.e. the change in magnetic flux induces an electric current in the coil. Measures can be taken so that the mass follows the motion of the ground rather than oscillating with its own natural frequency. This can be achieved by damping its motion either mechanically, or electromagnetically, using additional coils. The electrical signal can then be magnified and digitized.
In simple words: A seismograph works by using a suspended needle attached to a large mass that 'draws' on a piece of paper. When the ground moves, along with the paper, the suspended needle doesn't move, which results in the needle drawing zig zags on the paper corresponding to how the ground moves.
Seismogram: Is the visible record of converted amplified ground motion displayed on a seismometer.
Thanks for your time! I hope you are now familiarized with the basics about this device.
Cheers!
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