Sphere target strength calculator

The sphereTS package calculates the acoustic target strength (TS) of elastic spheres immersed in a fluid. It is intended for calculating the TS of the spheres used for calibrating echosounders used for quantitative estimates of marine organism backscatter.

Install from pypi:

pip install spherets

and run the GUI from a terminal (type spherets) to get the main window:

main

TS values are shown in a separate window:

results

The underlying target strength functions are also available, for example:

import matplotlib.pyplot as plt
from sphereTS import sphere_ts as sts

wc = sts.material_properties()['Tungsten carbide']

c = 1470  # [m/s] sound speed in water
rho = 1027  # [kg/m^3] density of water
a = 0.0381/2  # [m] radius of sphere

ts = sts.sphere_ts(38e3, a, c, wc['c1'], wc['c2'], rho, wc['rho1'])

print(ts)

f, tsf = sts.freq_response(12e3, 200e3, a, c, 
                           wc['c1'], wc['c2'], rho, wc['rho1'])

plt.plot(f/1e3, tsf)

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