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Chapter 5 Signals and Noise

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Chapter 5 Signals and Noise. Modulation – Converting a dc signal to a higher frequency 1/f noise is less troublesome at higher frequencies. Choppers. Lock-in amplifier. After 9 repeat measurements. S/N increased by 3. Signal Averaging. C lick graph. Moving average. - PowerPoint PPT Presentation

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Page 1: Chapter 5 Signals and Noise

Chapter 5Signals and Noise

Page 2: Chapter 5 Signals and Noise
Page 3: Chapter 5 Signals and Noise

Modulation – Converting a dc signal to a higher frequency

• 1/f noise is less troublesome at higher frequencies

Page 4: Chapter 5 Signals and Noise

Choppers

Page 5: Chapter 5 Signals and Noise
Page 6: Chapter 5 Signals and Noise

Lock-in amplifier

Page 7: Chapter 5 Signals and Noise
Page 8: Chapter 5 Signals and Noise
Page 9: Chapter 5 Signals and Noise

After 9 repeatmeasurements

S/N increased by 3

Page 10: Chapter 5 Signals and Noise

Signal Averaging

Click graph

Page 11: Chapter 5 Signals and Noise

Moving average

Page 12: Chapter 5 Signals and Noise

Polynomial Smoothing

B: quadratic 5 pt smooth

A: raw data

C: 4th degree 13 pt smooth

D: 10th degree 77 pt smooth

Page 13: Chapter 5 Signals and Noise

Polynomial Smoothing

Click graph


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