Measurement cells of the Nortek AquaDopp HR Profiler 2MHz having two beams (2D)

Hi Thang,

The measurement cells are composed in a similar way for the HR as for the regular Aquadopp Profile. If I have understood your question correctly you can find the answer to this question here.

Best regards,

Sven Nylund

Thank Sven Nylund so much,

I followed at the link you mentioned. As I understand, measurement cells are along the vertical direction between the two beams. In my case, it is the vertical, upward direction.

However could you please tell me about the profiling range? If measurement cells do overlap, why does the profiling range appear to be Cell size x Number of cells? I thought, due to the overlapping of measurement cells, the profiling range would be 0.5*(Number of cells +1)*Cell size. For instance, due to overlapping, two measurement cells with 1cm Cell size each would give only 1.5 cm profiling range (not 2*1 = 2cm profiling range).

Thank you so much,

Thang

Hi Thang,

The cell position are composes by a transmit pulse that has the same length as the receive window. The convolution of the two is a triangular weighting function that makes up for the individual cells. The cell position is referred to the peak in the triangular weighting function. This means that the position (Zi) of an arbitrary cell mid-point is given by:

Zi = Blanking + i × Cell size

The base line of each cell is equal to twice the distance between adjacent cells, whereas the distance between adjacent mid-point equals the cell size you set in the configuration. From this it follows that there is a 50% overlap between adjacent cells as you can see in the attached figure.

Best regards,

Sven

Dear Sven

I got to understand the situation here. It turns out that the length of a measurement cell is double the cell size set in the configuration.

Thank you so much.

Thang