Patent ID: 9286780
Filing Date: 2016-03-15
CPC Classification: G08B

Claim Text:
1. A smoke detector, comprising: an ionization chamber formed by a first electrode and a second electrode, in which electrical charges are generated by ionization of air; a drift chamber formed by the second electrode and a third electrode and separated from the ionization chamber by the second electrode, the drift chamber configured to allow smoke particles from a detector environment to enter an interior of the drift chamber; the first electrode configured to brought to an electric potential, relative to the second electrode, exceeding a critical electric potential value to generate a corona effect in the vicinity of the first electrode, which generates discharges that ionizes the air in the ionization chamber; the second electrode comprising apertures to enable electric charges generated by the ionization of air in the ionization chamber to move towards the drift chamber, an electric potential of the second electrode, relative to the third electrode, allows the electric charges in the drift chamber to move from the second electrode towards the third electrode, wherein an electric field generated between the second electrode and the third electrode is at least 100 times weaker than an electric field generated between the first electrode and the second electrode; and a measurement device to measure an electrical magnitude representative of speed of electrical charges between the second electrode and the third electrode and to trigger an alarm when a change in the electrical magnitude is below a predetermined threshold.