FieldII-example-srsy.doc

创建一个线阵探头
Th = xdc_linear_array(no_elements, width, height, kerf, no_sub_x, no_sub_y, focus);

Input: no_elements Number of physical elements.
Width: Width in x-direction of elements.
Height: Width in y-direction of elements.
Kerf: Distance in x-direction between elements.
No_sub_x Number of sub-divisions in x-direction of elements. （虚拟单元，用于计算）
No_sub_y Number of sub-divisions in y-direction of elements.
focus[] Fixed focus for array (x,y,z). Vector with three elements.
Output: Th A pointer to this transducer aperture.

Example of transducer definition:
Create a 16 elements linear array, and divide the physical elements into 2 by 3 mathematical elements to increase the accuracy of the simulation.

height=5/1000; % Height of element [m]
width=1/1000; % Width of element [m]
kerf=width/4; % Distance between transducer elements [m]
N_elements=16; % Number of elements
focus=[0 0 40]/1000; % Initial electronic focus
Th = xdc_linear_array (N_elements, width, height, kerf, 2, 3, focus);

空间中一点的冲击响应
[h, start_time] = calc_h(Th,points);

Input: Th:Pointer to the transducer aperture.
Points: Field points. Vector with three columns (x,y,z) and one row for each field point.
output: h:Spatial impulse response in m/s.
start_time: The time for the first sample in h.