The measured phase values are used as input for a feedback loop controlling the current in the superconducting coil.
where T 0 is the sampling period, u ref and u are respectively input and output sine signals of the loop, A ref and A are respectively reference and measured amplitudes, w ref and w are respectively reference and measured pulsation values, phase ref and phase are respectively reference and measured phase values, and N is the number of samples during the numerical optimisation experiment.
The measured phase values using the R3 resistor deviated from zero degree by less 0.1 degree.
Since the measured phase is limited only between − π and π, the phase ambiguity occurs when some values of the real phase − 4πf 0 R n /c are over this range.
At low elevation levels, the bulk of measured phase shift values will lie just below the maximum possible value, Ψ max, but the statistical spread in the measured phase will shift some of the "true" phase values beyond Ψ max.
While the logarithmic algorithm is advantageous, it does impose an important practical requirement to unwrap both the measured and computed phase values.
A scatter plot of FMD values against pCO2 values (both measured at phase 1) is reported on Figure 2. Besides, a significant positive correlation was found between relative changes in FMD and pCO2 levels, passing from phase 1 to phase 2 (r=0.23, P=0.023).
Linear phase histograms, circular phase plots, and circular statistical measures were calculated using the instantaneous phase values for each spike, only the first spike in each LTS burst, or all spikes outside of LTS bursts (non-LTS spikes), depending on the frequency band being analyzed.
Intersite phase clustering (ISPC) measures the similarity between pairs of channels of their time frequency phase values across trials.
