APPARATUS FOR MONITORING RUNWAY LIGHTS

摘要

PURPOSE:To take preventive maintenance disposal before the generation of fusing trouble by always monitoring the temp. of a connector part and displaying the position of the connector part at the time of the judgement of abnormality. CONSTITUTION:The lights 1 arranged along a runway at predetermined intervals are divided into groups each consisting of several lights and the respective groups are connected in series by a cable to be connected to the secondary sides of insulated transformers 2. All of the primary sides of the transformers 2 are connected in series by a cable 4 and a constant current is supplied to the transformers from a constant current control apparatus 6. One optical fiber 5 is laid in close contact with the cable 4 on the transformer primary side circuits. The optical fiber 5 are graduated to measure the distance from a reference point to a connector. When a laser pulse beam is incident to the optical fiber 5, the pulse beam advances while scattering. The scattered light toward the incident end is collected by a photodetector. When the speed of back-scattered light advancing through the fiber is known, the origin of the backscattering in the fiber is known.