A method for measuring a plurality of characteristic loop sensitivity (S LC) for each and all acoustic transducers in a transducer array in an acoustic probe, the method comprising: generating, by a pulse generator electrically coupled to a 50 S2 load, a pulse to create a wideband signal as a reference signal; obtaining a wideband reference signal V r ( t); obtaining a function V̂ r ( f) that is a Fourier Transform of the wideband reference signal V r ( t); obtaining an energy spectrum of wideband reference signal based on the function V̂ r ( f); calculating a bandwidth of reference signal (BW r) at a designated decibel for the energy spectrum of the wideband reference signal; calculating an energy of reference signal (E r) for the wideband reference signal V r ( t); and calculating an energy density of reference signal (D r) for the wideband reference signal: D r = E r / BW r; performing the following steps sequentially or randomly over each and all acoustic transducers in the acoustic transducer array: coupling the pulse generator and a signal processing unit to an acoustic transducer; generating, by the pulse generator electrically coupled to the acoustic probe, a wideband acoustic wave from the acoustic transducer; obtaining a wideband echo signal V e ( t) after the wideband acoustic wave being reflected from an acoustic mirror; obtaining a function V̂ e ( f) that is a Fourier Transform of the wideband echo signal V e ( t); obtaining an energy spectrum of wideband echo signal based on the function V̂ e ( f); calculating a bandwidth of echo signal (BW e) at a designated decibel for the energy spectrum of wideband echo signal; calculating an energy of echo signal (E e) for the wideband echo signal V e ( t); calculating an energy density of echo signal (D e) for the wideband echo signal: D e = E e / BW e; obtaining an energy density of reference signal (D r); and defining a characteristic loop sensitivity (S LC) for the acoustic transducer: S LC = def 10 log D e / D r. generating, by a pulse generator electrically coupled to a 50 S2 load, a pulse to create a wideband signal as a reference signal; obtaining a wideband reference signal V r ( t); obtaining a function V̂ r ( f) that is a Fourier Transform of the wideband reference signal V r ( t); obtaining an energy spectrum of wideband reference signal based on the function V̂ r ( f); calculating a bandwidth of reference signal (BW r) at a designated decibel for the energy spectrum of the wideband reference signal; calculating an energy of reference signal (E r) for the wideband reference signal V r ( t); and calculating an energy density of reference signal (D r) for the wideband reference signal: D r = E r / BW r; performing the following steps sequentially or randomly over each and all acoustic transducers in the acoustic transducer array: coupling the pulse generator and a signal processing unit to an acoustic transducer; generating, by the pulse generator electrically coupled to the acoustic probe, a wideband acoustic wave from the acoustic transducer; obtaining a wideband echo signal V e ( t) after the wideband acoustic wave being reflected from an acoustic mirror; obtaining a function V̂ e ( f) that is a Fourier Transform of the wideband echo signal V e ( t); obtaining an energy spectrum of wideband echo signal based on the function V̂ e ( f); calculating a bandwidth of echo signal (BW e) at a designated decibel for the energy spectrum of wideband echo signal; calculating an energy of echo signal (E e) for the wideband echo signal V e ( t); calculating an energy density of echo signal (D e) for the wideband echo signal: D e = E e / BW e; obtaining an energy density of reference signal (D r); and defining a characteristic loop sensitivity (S LC) for the acoustic transducer: S LC = def 10 log D e / D r. coupling the pulse generator and a signal processing unit to an acoustic transducer; generating, by the pulse generator electrically coupled to the acoustic probe, a wideband acoustic wave from the acoustic transducer; obtaining a wideband echo signal V e ( t) after the wideband acoustic wave being reflected from an acoustic mirror; obtaining a function V̂ e ( f) that is a Fourier Transform of the wideband echo signal V e ( t); obtaining an energy spectrum of wideband echo signal based on the function V̂ e ( f); calculating a bandwidth of echo signal (BW e) at a designated decibel for the energy spectrum of wideband echo signal; calculating an energy of echo signal (E e) for the wideband echo signal V e ( t); calculating an energy density of echo signal (D e) for the wideband echo signal: D e = E e / BW e; obtaining an energy density of reference signal (D r); and defining a characteristic loop sensitivity (S LC) for the acoustic transducer: S LC = def 10 log D e / D r.