Along-beam bin center separation

For ADCPs, the <math>Z</math>-axis in instrument coordinates is commonly defined along the axis of the ADCP pressure case. The velocity data are commonly given in terms of this <math>Z</math>-coordinate. For a vertical beam, the along beam bin center separation (<math>r_0</math>) is given by:

<math>\delta r_0 = \delta z</math>

where <math>\delta z</math> is the distance between bin-centers along the <math>Z</math>-axis.

For diverging beams, the along beam bin center separation (<math>r_0</math>) is given by:

<math>\delta r_0 = \frac{\delta z}{\cos\theta}</math>

where <math>\theta</math> is the angle of the diverging beams with the <math>Z</math>-axis.

Schematic of ADCP and its beams, showing the difference between the vertical co-ordinate <math> z </math> and the along-beam radial distances <math> r </math>

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