Along-beam bin center separation

[PLACEHOLDER -- NEED TO CONFIRM THIS IS CORRECT AND/OR ADD PICTURE]

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>r_0 = z</math>

where <math>z</math> is the distance from the transducer along the <math>Z</math>-axis.

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

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

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