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The smoke detector has a radioactive source americium-241 in the inner and outer ionization chambers, and the positive and negative ions produced by ionization move to the positive and negative electrodes respectively under the action of the electric field. Under normal conditions, the current and voltage of the inner and outer ionization chambers are stable. Once there is smoke escaping the ionization chamber. If the normal movement of charged particles is interfered with, the current and voltage will change, and the balance between the internal and external ionization chambers will be destroyed, so the wireless transmitter will send out a wireless alarm signal to notify the remote receiving host and transmit the alarm information.
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