LIGHTNING DATA RECORDING DEVICE

To provide a lightning data recording device which can calculate and record a peak value and a charge amount of a lightning current of a wide band, while achieving downsizing and cost reduction of a sensor by using a bar antenna as a magnetic field sensor.SOLUTION: A lightning data recording device comprises: a bar antenna as a magnetic field sensor 21 for outputting electric voltage equivalent to a differential value of lightning current when lightning strikes a building; an integration and amplification circuit 11 for integrating and amplifying an output voltage of the bar antenna; a calculation and recording section 14 for calculating and recording a positive or negative peak value and a charge amount of lightning current on the basis of an output of the integration and amplification circuit 11; and a trigger detection section 13 for detecting a trigger signal when a plurality of auxiliary magnetic field sensors 41 simultaneously detect a magnetic flux generated when lightning strikes a building. The calculation and recording section 14 is activated when the trigger signal is detected, in order to calculate and record the peak value and the charge amount.SELECTED DRAWING: Figure 1 【課題】磁界センサとしてバーアンテナを用いることでセンサの小型化、低コスト化を図ると共に、広帯域の雷撃電流に対してそのピーク値及び電荷量を演算・記録可能とした落雷データ記録装置を提供する。【解決手段】建造物への落雷時に雷撃電流の微分値相当の電圧を出力する磁界センサ２１としてのバーアンテナと、その出力電圧を積分し増幅する積分・増幅回路１１と、積分・増幅回路１１の出力に基づいて雷撃電流の正または負のピーク値及び電荷量を演算し、記録する演算記録部１４と、建造物への落雷時に発生する磁束を複数の補助磁界センサ４１により同時に検出した際のトリガ信号を検出するトリガ検出部１３と、を備え、トリガ信号の検出時に演算記録部１４を起動して前記ピーク値及び電荷量を演算・記録する。【選択図】図１