| 摘要 |
PURPOSE:To detect a low-speed electron with prescribed sensitivity without using various meteorological sensors and a special arithmetic means, and also irrespective of variations of the atmospheric state, by detecting directly the atmospheric state as a discharge state. CONSTITUTION:A low-speed electron detector provides an anode 2 on the inside of a container-shaped cathode 1 in which an inflow port 1a of a low-speed electron has been formed in one end, and it is provided with a variable voltage type high voltage generating device 5 for outputting a voltage enough for generating a discharge to the anode 2. Also, an atmospheric state detector 10 provides an anode 12 on the inside of a container-shaped cathode 11 in which an inflow port 11a communicating with the atmosphere has been formed, and it is provided with a variable voltage type high voltage generating device 15 for outputting a voltage enough for generating a discharge to the anode 12. In this state, a controlling circuit 17 varies an output voltage from the device 15 the detector 10, in one direction, detects a voltage of the time point when a discharge state of the anode 12 of the detector 10 has been varied, and sets a voltage for generating a discharge of a prescribed level to the low-speed electron detector, to the device 5, based on this detected voltage.
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