Experimental Study of a Broadband Parametric Acoustic Array for Sub-Bottom Profiling in Shallow Water

Table 1

Penetration depth of the difference frequency signal.

Frequency of difference frequency sound wave(Hz)	Average absorption coefficient in stratum (dB/λ)	Penetration depth (m)
10	0.1	14
	0.8	2
20	0.1	10
	0.8	1.4
30	0.1	11
	0.8	1.4