D. Diiorio et Dm. Farmer, SEPARATION OF CURRENT AND SOUND SPEED IN THE EFFECTIVE REFRACTIVE-INDEX FOR A TURBULENT ENVIRONMENT USING RECIPROCAL ACOUSTIC TRANSMISSION, The Journal of the Acoustical Society of America, 103(1), 1998, pp. 321-329
Here a high-frequency acoustic experiment through a turbulent flow in
Cordova Channel is described which is specifically designed to measure
the contribution of scalar and vector fluctuations to the total scatt
ered signal over a 48-h period. The effective refractive index fluctua
tions are determined by both the random changes in sound speed (scalar
s) and the random motion of the medium (vectors), and so in this paper
it is demonstrated that reciprocal acoustic transmission is a techniq
ue which unambiguously separates their effects, The effective refracti
ve index structure parameter, C-eta eff(2) is defined as the sum of sc
alar C-eta s(2) and vector C-eta v(2) contributions through the equati
on C-eta s(2) + 11/6C(eta v)(2). The effective refractive index struct
ure parameter is also measured from the forward propagation acoustical
scintillation variances, thus providing an independent check on the i
nterpretation. (C) 1998 Acoustical Society of America.