Evaluation of skin blood flow using laser speckle phenomena (V)

This is the authors' abstract. We don't add key points for this paper.

Power spectrum analyses are conducted experimentally for laser speckle signals produced by skin blood flow. Several different types of the optical fiber probe consisting of a pair of fibers, i. e., irradiation and detecting fibers, are tested and their signals are compared. It was found that the ratio of the high frequency to the low one in the speckle signal becomes larger with an increase of the separation distance of the fiber pair in the probe.