SONOTRAX(2009) Series Ultrasonic Pocket Doppler User Manual
93
overall systematic uncertainties were determined as
follows:
1. Hydrophone Sensitivity: ±23 percent for intensity,
±11.5 percent for pressure. Based on the hydrophone
calibration report by ONDA. The uncertainty was
determined within ±1 dB in frequency range 1-15
MHz.
2. Digitizer: ±3 percent for intensity. ±1.5 percent for
pressure.
Based on the stated accuracy of the 8-bit resolution
of the Agilent DSO6012 Digital Oscilloscope and the
signal-to-noise ratio of the measurement.
3. Temperature: ±1 percent
Based on the temperature variation of the water bath
of ±1ºC (1.8°F).
4. Spatial Averaging: ±10 percent for intensity, ±5
percent for pressure.
5. Non-linear Distortion: N/A.
No effects of nonlinear propagation were observed.
Since all the above error sources are independent,
they may be added on an RMS basis, giving a total
uncertainty of ±25.1 percent for all intensity values
reported, ±12.7 percent for all the pressure values
and ±12.6 percent for the Mechanical Index.
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