- Get the calibrated 90° square (hard) pulse length and power level in hands,
- use
**stdisp**to open the shape file you want, (and find the shape pulse length, integral factor (IF), and the total rotation angle from the file contents.) - click analysis → integrate shape → input shape pulse length, rotation angle, calibrated 90 hard pulse length, and enter,
- [for an adiabatic shape pulse, click analysis → integrate adiabatic shape → input shape pulse length, calibrated 90 hard pulse length, and enter,]
- the results will show the change of power Δ, so shape pulse power level will be set to (Δ + hard pulse power level).

** calcplen** and

**can be used to calculate hard (square) pulse length at different power level, or power level at different pulse length, certainly with the calibrated 90° square (hard) pulse length and the power level in hands.**

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In order to calculate the power level for an non-adiabatic shape pulse:

Using the equation: dB_{2 }– dB_{1} = Δ = 20*log((pw_{2}*IF)/pw_{1}) —unit(dB)

pw_{2} – shape pulse length; pw_{1} – 90° hard pulse length; IF – integral factor = area of shape pulse/area of square pulse with the same length

[ if it’s 180° rotation with that shape pulse length, it’s power level will be:

dB_{2 }– dB_{1} = Δ = 20*log(pw_{2}*IF/(2*pw_{1}))

= 20*log(pw_{2}*IF/pw_{1}) + 20log(1/2)

= 20*log(pw_{2}*IF/pw_{1}) – 20*0.3

= 20*log(pw_{2}*IF/pw_{1}) – 6 — unit (dB) ]

In order to calculate the power level for an adiabatic shape pulse:

[use the same equation as the above for inversion pulses and quality /adiabaticity factor Q=5; for decoupling pulses and Q=3, use:

dB_{2}-dB_{1} = Δ = 20*log(pw_{2}*IF*(5/3)^{1/2}/(2*pw_{1})) — unit (dB) ]

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Hongwei edited on 10/05/2021