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x-6,y-6 These are respectively the in-plane (azimuth) and out-of-plane (elevation) -6
dimensions in the x-y plane where ZSP is found (centimeters).
PD The Pulse duration (microseconds) associated with the transmit pattern giving
rise to the reported value of the respective parameter
PRF The Pulse repetition frequency (Hz) associated with the transmit pattern giving
rise to the reported value of the respective parameter.
EBD The Entrance beam dimensions (centimeters) for the azimuth and elevation
planes.
EDS The Entrance dimensions of the scan (centimeters) for the azimuth and
elevation planes.
▌ Acoustic Measurement Precision and Uncertainty
The Acoustic Measurement Precision and Acoustic Measurement Uncertainty are described below.
Quantity Precision Total Uncertainty
PII.3 (derated pulse intensity integral) 3.2 % +21 % to - 24 %
Wo (acoustic power) 6.2 % +/- 19 %
Pr.3 (derated rarefaction pressure) 5.4 % +/- 15 %
Fc (center frequency) < 1 % +/- 4.5 %
Systematic Uncertainties.
For the pulse intensity integral, derated rarefaction pressure Pr.3, center frequency and pulse
duration, the analysis includes considerations of the effects on accuracy of:
Hydrophone calibration drift or errors.
Hydrophone / Amp frequency response.
Spatial averaging.
Alignment errors.
Voltage measurement accuracy, including.
- Oscilloscope vertical accuracy.
- Oscilloscope offset accuracy.
- Oscilloscope clock accuracy.
- Oscilloscope Digitization rates.
- Noise.
The acoustic power is measured using a Radiation Force for systematic uncertainties through
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