Amplitude signal/peak

A threshold must be chosen to distinguish the signal due to fluorescence molecules from the signal due to noise in the background signal. In the data of Fig. 2(A), the threshold was drawn at a signal of 0.1 V amplitude. Those peaks that exceeded... 

Amplitude a peak voltage of the signal waveform is usually assigned. Amplitudes are expressed on a decibel scale instead of linear scale... 

Note that while the ToF information is relatively consistent, the amplitude is varying considerably between the measurement points. This confirms the uncertainty related to the amplitude information which, in this works serves only to locate the area in which the measurements should be taken typically measurements are limited to within the range of signal amplitudes in excess of 30% of the peak value. 

Gate Start and Width. Define the start position and width, in millimetres, of the gate used for defining the time interval in which the peak amplitude of the signal will be measured. 

Averaging is a teehnique to improve the S/N ratio. Two or more sueeessive speetra made up of both periodie and random (noise) signals are added together and then averaged. This eombination results in a speetrum with a periodie eomponent that is mueh the same as when viewed in the instantaneous signals but with random peaks of mueh less amplitude. This result oeeurs beeause the period peak stays at a fixed frequeney in the speetrum, while the noise peak is fluetuating in frequeney over the speetrum. 

The AC component of the modulator/demodulator output is an indica tion of dynamic motion, or vibration. This signal provides data relating to the peak-to-peak amplitude, frequency, and form of the dynamic action of the observed surface. 

The pump noise frequency is varying around 8 Hz with a peak-to-peak amplitude of 20 psi. Can the signal still be detected Explain. 

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