Week 7 notes of Physics 3LB lab at University of California, Irvine. Notes are based on the course's lab manual and are intended to help you understand the theory of "Frequency Response."
Wk7: Frequency Response
Abbreviation Key:
Monday, February 17, 2020 1:55 PM
w/ = with
vs = versus
--> = thus, or therefore
Ex. = For example,
• Objective: We will measure resonance and distortion using cheap speakers, and Expt = experiment
use Fourier Analysis.
• Resonance: frequencies that maximize the energy transfer to the system.
• Response: ratio of detected signal to true signal. Measured / Theoretical
• An ideal detector of frequency response is a flat, horizontal line on a
Response(units V) vs Frequency(units Hz) plot.
○ The measured voltage is linearly proportional to the physical property being
measured. -->
○ A lot of behaviors of physical systems can be answered w/ frequency
response measure.
• A good detector gives a flat response over a restricted frequency range.
• A poor detectors exhibits resonances (maximum response).
○ Near resonance, the measured signal is due to of the properties of the
Independent: waveforms
Dependent: frequency response
detector, not the physical property being measured.
Can manipulate the signal given (alter frequencies
• Ex. Earthquake vs Skyscraper that meet system's sensitivity range) to show a
response.
○ To avoid a skyscraper falling down, the skyscraper must be designed in a way
so that its resonances avoid dominant frequencies of ground motion.
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