PROBLEM TO BE SOLVED: To provide a nest building detection device by which nest building on an electric pole is detected on early state and reported to a worker.SOLUTION: A nest building detection device 1 includes: a main body case 10 mounted on a crossarm of the electric pole an optical fiber 20 of which one end is disposed within the main body case 10, the central part is disposed outside of the main body case 10 and the other end is disposed within the main body case 10 a light-emitting part 30 which is disposed within the main body case 10 and inputs light to the one end of the optical fiber 20 a light-receiving part 40 which is disposed within the main body case 10, receives the light from the light-emitting part 30 that is outputted from the other end of the optical fiber 20, and performs photoelectric conversion in accordance with the quantity of received light a detection part 50 which outputs a detection signal in the case where the output of the light-receiving part 40 becomes lower than a preset value and a communication part 60 by which information for identifying the electric pole is added to the detection signal outputted from the detection part 50, and outputted to the outside. The central part of the optical fiber 20 is disposed above the main body case 10 and includes a protrusively curved portion at an upper side.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】電柱に営巣されていることを早期に検知しかつ作業員に報知する営巣検知装置を提供すること。【解決手段】営巣検知装置1は、電柱の腕金に装着される本体ケース10と、一端部が本体ケース10の内部に配置され、中央部が本体ケース10の外部に配置され、他端部が本体ケース10の内部に配置される光ファイバ20と、本体ケース10の内部に配置され、光ファイバ20の一端部に光を入力する発光部30と、本体ケース10の内部に配置され、光ファイバ20の他端部から出力される発光部30からの光を受光し、受光量に応じて光電変換する受光部40と、受光部40の出力が予め設定した値より低くなった場合に検知信号を出力する検知部50と、検知部50から出力された検知信号に電柱を特定するための情報を付加して外部出力する通信部60と、を備え、光ファイバ20の中央部は、本体ケース10の上方に配置され、上方に凸の湾曲部分を有する。【選択図】図1
