| 摘要 |
PURPOSE:To realize photometory for plural objects, by delivering a light pulse signal to an optical sensor terminal in which plural optical sensors and optical delay lines are connected alternately and in series via an optical fiber, and detecting rearward scattered light from the sensor terminal. CONSTITUTION:In the optical sensor terminal 3, optical sensors 11-1(n+1) are connected alternately and in series via the optical delay lines 21-2n which delay the optical pulse signals Lt, respectively. An electrical pulse signal St is supplied from a control monitor part 4 to an electrooptical converter 5, and a converted signal Lt is radiated to the optical fiber 2 and the terminal 3 via a directional coupler 6. According to the progression of the signal Lt, the rear scattered light Lr is supplied from each of the optical fiber 2, the sensors 11-1(n+1), and the delay lines 21-2n to a rear scattered light measurement system 1. The monitor part 4 detects the change of a receiving power in an electrical signal Sr arriving at a time when the only time corresponding to the sensors 11-1(n+1) elapses after delivering the signal St, thereby, it is possible to perform the photometory for the plural objects. |
