Manual acoustic axis aligning method for ultrasonic sound field measuring system

A non-transitory computer readable storage medium containing computer executable instructions, which when executed configure at least one computer processor to perform a manual acoustic axis aligning method for an ultrasonic sound field measuring system, specifically comprising the following cycles:

• 1) determining three planes according to a focus position, wherein the three planes are a focusing plane Zfocus, an acoustic axis angle detection plane Z1 and an acoustic axis angle detection plane Z2;
• defining distances from a probe to the focusing plane Zfocus, the acoustic axis angle detection plane Z1 and the acoustic axis angle detection plane Z2 as Dfocus, a and b, respectively;
• 2) determining a peak point of an underwater acoustic signal of the focusing plane Zfocus and taking the peak point as an initial center point PC1, and denoting the coordinate of the initial center point PC1 as [PC_X1, PC_Y1];
• 3) in the acoustic axis angle detection plane Z1, scanning with PCi as the center, changing the coordinates of X and Y, and acquiring sound field signals to obtain the intersection C1=[C1X, C1Y] between the acoustic axis and the acoustic axis angle detection plane Z1, where i is a positive integer;
• 4) in the acoustic axis angle detection plane Z2, scanning with PCi as the center, changing the coordinates of X and Y, and acquiring sound field signals to obtain the intersection C2=[C2X, C2Y] between the acoustic axis and the acoustic axis angle detection plane Z2, where i is a positive integer;
• 5) calculating the inclination angle θi=[θxi, θyi] of the current acoustic axis according to the intersection points C1 and C2;
• θxi is the included angle between the acoustic axis and Z axis after the acoustic axis is projected on XOZ plane, and θyi is the included angle between the acoustic axis and Z axis after the acoustic axis is projected on YOZ plane;
• 6) judging whether the inclination angle θi is less than a adjustment threshold, if so, aligning the acoustic axis, ending a adjustment, otherwise, proceeding to step 7);
• 7) according to the inclination angle θi, calculating the next coordinate PCi=[PC_Xi, PC_Yi] by using an iterative algorithm, where i is an integer not less than 2;
• 8) keeping PCi of the X axis and Y axis unchanged, moving the Z axis to the focusing plane Zfocus, manually adjusting two corner adjustment knobs of a probe clamping device until the amplitude of a hydrophone measurement signal at the current coordinate point is the maximum, and then proceeding to step 3).