2016 Volume 54Annual Issue 28PM-Abstract Pages S386
A flexible blood flow monitoring device is being developed using optical sensors to detect abnormalities in blood flow in transplanted tissues after a reconstruction surgery. The number of wires and readout time may cause technical problems when realizing multipoint sensing for monitoring a large area. The purpose of this study is to develop a matrix of optical sensors and a readout circuit for simultaneous multipoint sensing in 256 points. The matrix is developed by connecting a photodiode (PD) and a rectifier diode in cascade, and wiring the units in a grid-like form. The photocurrents of sensors in a row are read from each wire of a column while applying a negative voltage to the row. This method enabled us to measure the photocurrent of all the 256 sensors in the matrix at 25 Hz. In addition, we reduced the number of wires from 512 to 32 and downsized the readout system. In the future, we will apply this system for monitoring blood flow by using a PD matrix on a flexible substrate.
