k intop_pt(acpr.k)*1[1/rad] Wave number
ka k*a k*a
p0 intop_pt(acpr.rho*acpr.c*u0) Specific reference pressure
p_axis p0*(exp(-i*k*z)-exp(-i*k*sqrt(z^2+a^2))) On-axis near-field pressure (analytical)
R0 k*a^2/2 Rayleigh length scale
p_axis_ff p0*(exp(-i*k*z)-exp(-i*k*sqrt(z^2+a^2))) On-axis far-field pressure (analytical)
P_ar (pi/2)*a^2*u0*p0*(1-2*besselj(1,2*acpr.k*a)/(2*acpr.k*a)) Acoustic radiated power
p_ana i*a*p0/dis*besselj(1,ka*sin(theta))/sin(theta)*exp(-i*ka/a*dis) Analytical far-field pressure (spatial)
dis sqrt(r^2+z^2) Distance from origin
theta atan2(r,z) Polar angle (from z-axis)