Samsung SONOACE R3 Instrukcja Użytkownika Pobierz pdf (Strona 47)

100

101

Chapter 1 Safety

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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 for the azimuth and elevation planes (centimeters).

EDS The entrance dimensions of the scan for the azimuth and elevation planes (centimeters).

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 eects on accuracy of:

Hydrophone calibration drift or errors.

Hydrophone / Amp frequency response.

Spatial averaging.

Alignment errors.

Voltage measurement accuracy, including.

Oscilloscope vertical accuracy.

Oscilloscope oset accuracy.

Oscilloscope clock accuracy.

Oscilloscope Digitization rates.

Noise.

The systematic uncertainties Acoustic power measurements using a Radiation Force are measured

through the use of calibrated NIST acoustic power sources.

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