公开(公告)号：US3792254A

公开(公告)日：1974-02-12

申请号：US3792254D

申请日：1971-07-15

Applicant: VIGIFEU

Inventor： LECUYER D

IPC: G08B17/113 ,  H01J41/08 ,  G01T1/18

CPC classification number: G08B17/113 ,  H01J41/08

Abstract: An ionization detection chamber, in particular for a fire detecting apparatus, of the type comprising an ionizing source and two electrodes each of which constitutes an ion collecting electrode of a given sign. In order to minimize the variation of the ion collection current when the surrounding pressure increases, the chamber further comprises at least one ion collecting member integral with one of the electrodes, said collecting member extending towards the ionizing source in the radiation beam of the latter.

Abstract translation: 特别是用于火灾检测装置的电离检测室，包括电离源和两个电极，每个电极构成给定符号的离子收集电极。 为了最小化当周围压力增加时离子收集电流的变化，腔室还包括与电极之一成一体的至少一个离子收集构件，所述收集构件朝向后者的辐射束中的电离源延伸。

公开(公告)号：US3582646A

公开(公告)日：1971-06-01

申请号：US3582646D

申请日：1968-02-06

Applicant: VIGIFEU AUBERVILLIERS

Inventor： PONSAR CHRISTIAN MARIE MAURICE

IPC: G01T7/12 ,  G08B17/113 ,  G08B17/12 ,  G01N23/12

CPC classification number: G08B17/12 ,  G01T7/125 ,  G08B17/113

Abstract: A fire detection device comprising an enclosure enclosing a reference ionization chamber and an unsaturated measuring ionization chamber interconnected in series and each containing a source of radioactive radiations, at least one alarm and/or automatic intervention device, a grid permeable to gases defining one end of the enclosure, the enclosure having apertures communicating with passages at one end of the unsaturated chamber so that gas can flow through the unsaturated chamber, from outside the device, a common electrode extending into both chambers and a printed circuit controlling the alarm and/or intervention device.