Patent Document ID: 4187488
Application ID: 05888080
Patent Flag: 1

Claim One:
1. A reverberation backscatter measurement system comprising: (a) means for transmitting an acoustic signal in a fluid environment; (b) means for receiving reflected acoustic signals of said transmitted acoustic signal from a target and for converting said reflected acoustic signal into a corresponding electrical signal; (c) means for calibrating and adjusting said electrical signal against a standard signal, said calibrating means receiving as input said electrical signal; (d) first correction means receiving as input the output of said calibrating means, said first correction means providing an output signal representing the acoustic target strength of said reflected acoutic signal corrected for velocity of sound in said fluid medium in situ and for the frequency used for said transmitted signal; (e) second correction means receiving as input the output of said calibrating means, said second correction means providing a parallel output signal to said output of said first correction means representing said acoustic target strength per unit volume of fluid medium of said reflected acoustic signal corrected for the wide and narrow beam angles of said transmitting means and for the pulse length of said transmitted signal; and (f) means for selecting for analysis said output signal of said first correction means representing acoustic target strength of said reflected acoustic signal or said output of said second correction means representing acoustic target strength of said reflected acoustic signal per unit volume of said fluid medium.