Temperature field reconstruction in acoustic travel-time tomography

Acoustic images of variable parameters of objects can be reconstructed by means of tomographic techniques, which utilize the propagation of sound waves in the investigated medium. Temperature field reconstruction technique based on acoustic travel-time tomography is described in this paper. Temperature-dependent sound speed can be estimated by measuring the travel-time of a defined acoustic signal between a sound source and a receiver when the distance between them is known exactly. On the basis of travel-time measurements and of the knowledge of the sound path, a cross section of the investigated temperature field can be evaluated using a reconstruction algorithm based on least-square method. Simulation results based on 16 sources/receivers are given and discussed.