Optical tomography realized by optical fiber sensors

The measurement of the concentration distribution is always important in industry. Many researches on image reconstruction of the two phase-flow field have been made in recent years. Various methods have been used such as capacity CT, resistance CT, x-ray CT and so on. When the flow has low concentration, however, measurement accuracy of these methods is poor. In addition, it needs the measurement to be free of charge in some case. In this paper, we have a pilot study for the two-phase flow utilizing the optical fiber sensors. Two turbidity samples with different attenuation have been used to simulate the cross section distribution of the two-component flow. The graded-index fiber lens in the end of the optical fiber has been used in order to improve the coupling efficient and decrease the cross talk of the adjacent channel s. Finally, we make use of the linear back projection arithmetic (LBP) to reconstruct the image of the sample. A filtering method has been used to eliminate the star noise owing to the LBP arithmetic. We find that the reconstructed images are very well consistent with the cross-section distribution of the samples.