90 Deg Transducer Coordinate System

Greetings List:

I have received this question many times:

"Could you provide me with the definitions of the XYZ directions relative to the head and profiler orientation when I am using the 90 degree transducer head on the Aquadopp?"

Please see the attached PDF for a description.

Best regards,
Eric Siegel

Because of all the angles and all the different heads Nortek make we aim to rely on liner algebra and avoid  "intuitive" calculations:

The beam unity vectors are:

e1, e2,  e3

The along beam velocities are then:

V1 = e1 dot U, V2=...

where U is the water velocity.

The Vx, Vy, Vz velocities are in the coordinate system of the head:

[Vx, Vy, Vz] = inv(T) * [V1, V2, V3], where the matrix T is

T= {row 1: e1 row 2: e2  row 3: e3 }

And that's it.  For the Aquadopp profiler, the beams are 25 degrees relative to the vertical and the azimuth angle is 120 degrees.

Best regards, Atle Lohrmann

Sorry where is the attachment?

 

Previously Eric Siegel wrote:

Greetings List:

I have received this question many times:

"Could you provide me with the definitions of the XYZ directions relative to the head and profiler orientation when I am using the 90 degree transducer head on the Aquadopp?"

Please see the attached PDF for a description.

Best regards,
Eric Siegel

 

Sorry the last thread is wrong, I actually want to see the picture of Vector with vertical head showing the X direction, thanks.

XYZ for the Vector is defined the same for the two head options available. The appropriate figure is on page 24 of the Vector manual.

P.J.