Howtosignalprocessing
- How is sampling rate determined?
- What is the output of a lock-in amplifier?
- How do you choose a sampling rate based on frequency?
- What should be the sampling rate?
How is sampling rate determined?
The sampling frequency or sampling rate, fs, is the average number of samples obtained in one second, thus fs = 1/T. Its unit is sample per second or hertz e.g. 48 kHz is 48,000 samples per second.
What is the output of a lock-in amplifier?
The lock-in amplifies the signal and then multiplies it by the lock-in reference using a phase-sensitive detector or multiplier. The output of the PSD is simply the product of two sine waves. The PSD output is two AC signals, one at the difference frequency (ωr − ωL) and the other at the sum frequency (ωr + ωL).
How do you choose a sampling rate based on frequency?
The Nyquist theorem – choosing the right sample rate
The Nyquist theorem is part of the fundamentals of signal conditioning. Based on that, you must choose the sample rate at least twice as high as the maximum frequency in the signal.
What should be the sampling rate?
Definition: Sampling rate or sampling frequency defines the number of samples per second (or per other unit) taken from a continuous signal to make a discrete or digital signal.
