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公开(公告)号：GB1352396A
公开(公告)日：1974-05-08
申请号：GB2083971
申请日：1971-04-19
Applicant: SCI SYSTEMS INC
IPC: G01N27/66 , G01N33/00 , G08B17/11 , G08B17/113 , H01J41/08 , G08B23/00 , G01N21/22 , G08B17/10 , H01J39/28
Abstract: 1352396 Alarm systems SCI SYSTEMS Inc 19 April 1971 [2 Feb 1970 13 Aug 1970] 20839/71 Heading G4N [Also in Divisions G1 and H1] In a contamination detector, e.g. for detecting the contaminants in the atmosphere resulting from a fire, an electrical signal which varies with the concentration of the contaminents is provided and an alarm is generated when the rate of change of the signal attains or exceeds a predetermined value. As shown in Fig. 1 and Fig. 3 (not shown), an ionization detector 10 is connected to a pair of amplifiers 42, 44, a gate 46 being provided in a feedback loop of amplifier 44. The gate is periodically opened and closed by a generator 54. During the closed period the output of amplifier is driven to zero. However, during the open period, if the output of amplifier 44 reaches a preset valve, a latch circuit 50 is operated to cause energization of an alarm device 51. In an alternative, Fig. 6, a pair of FET's 214, 216 are connected to an ionization detector 202, the sources of the FET's being connected to the inputs of a differential amplifier 222. This amplifier is provided with a feedback loop including an integrator 223 having a long time constant. If the output of amplifier 222 reaches a preset value, a transistor is operated after a delay to trigger an SCR 266 which energizes a relay 270 to operate an alarm device 274. Figs. 7 and 8 (not shown), disclose a simplified version of the Fig. 6 embodiment. Means are provided to prevent production of an alarm in response to high-frequency components in the electrical signal. Means are also provided to test the power supply and indicate a shortcircuit. As shown in Fig. 2, the ionization detector consists of a perforated metal casing 14 having an insulating end cap 12, the casing containing an electrode 24, a pair of #-particle emitters 18, and a circuit board 20. In an alternative, a light source and photosensitive resistor may be utilized as the detector, Fig. 10 (not shown).
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公开(公告)号：IT943282B
公开(公告)日：1973-04-02
申请号：IT7112471
申请日：1971-12-17
Applicant: DETECTRON SA
IPC: G01N27/64 , G01N27/66 , G08B17/113 , H01J41/08 , G08B
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94.发明专利
公开(公告)号：FR2093217A5
公开(公告)日：1972-01-28
申请号：FR7020723
申请日：1970-06-05
Applicant: ANVAR
Abstract: Ionisation pressure gauge uses combination of electric field between electrodes and applied magnetic field to lengthen the ionising trajectory of rays from beta-emitter coating first electrode to give amplified measurement at low pressure. In one form, the first electrode is a rod coaxial with a cylindrical second electrode and on the axis of a cylindrical chamber. The magnetic field, in the form of a magnetic bottle, is produced by pole pieces at the bases of the cylinders. In an alternative form, the first electrode is a spiral ribbon within a cylindrical second electrode and cylindrical chamber, the magnetic pole pieces being at the sides.
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Patent Agency Ranking96.发明专利
公开(公告)号：GB1211181A
公开(公告)日：1970-11-04
申请号：GB167969
申请日：1969-01-10
Applicant: VIGIFEU
IPC: G08B17/12 , G08B17/113 , H01J41/08 , H01J47/02
Abstract: 1,211,181. Ionization counters. VIGIFEU. 10 Jan., 1969 [19 Jan., 1968], No. 1679/69. Heading HID. A detecting ionization chamber comprises a substantially cylindrical wall 1 open to the surrounding atmosphere and constituting a first electrode, an ionizing source 3 on the inner surface of the cylindrical wall, a rod 2 constituting a second electrode coaxial with the cylindrical wall and electrically insulated therefrom, and at least one ion collecting element 4 extending substantially perpendicular to the rod towards said ionizing source 3 in the radiation beam of the latter. In the arrangement shown the element 4 is a disc of conducting material, e.g. nickel-plated sheet steel, or of insulating material, integral with rod electrode 2 and extending to within a few millimetres of the α-emitter 3. Ions of one polarity are collected quickly, thus reducing the probability of recombination with consequent variation of collector current with increase in pressure. The device may be used as a measuring chamber in a fire-detecting apparatus capable of operating with suitable sensitivity over a pressure range of one to several atmospheres.
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公开(公告)号：GB1148440A
公开(公告)日：1969-04-10
申请号：GB4635866
申请日：1966-10-17
Applicant: MICRO TEK INSTR CORP
Abstract: 1,148,440. Ionization chambers. MICROTEK INSTRUMENTS CORP. 17 Oct., 1966 [18 Oct., 1965], No. 46358/66. Heading H1D. A radio-active source 86 including Ni 63 is used to promote ionization in a detector cell. A foil consisting entirely of Ni 63 may be used, or a layer of Ni 63 may be plated on a backing foil of gold, nickel, platinum or stainless steel or may be plated on an an electrode, preferably the cathode, of the cell. The cell shown comprises a cathode 80, insulating spacer 84, and conductive wafer 85 through which the anode 81 is adjustably screwed, forming a chamber 83 provided with a gas inlet 87 and outlet 90. Connection to the cathode and anode is by way of rods 96 and 98 supported by insulators 100 and 101 in sockets 97 and 99. The chamber and surrounding insulators 91, 92 are enclosed in members 93, 94, 95 forming a cylindrical body. A heater cartridge and temperature limit switch are provided in cylindrical recesses (not shown) in body member 93 to heat the cell to temperatures up to 500‹ C. The metal parts are preferably of stainless steel and the insulators of ceramic, preferably boron nitride. Simple cell constructions having parallel plane, cylindrical, and pin and cup electrode geometrics are described with reference to Figs. 1 to 4 (not shown). The gas filling may be argon.
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公开(公告)号：LU50399A1
公开(公告)日：1967-08-04
申请号：LU50399
申请日：1966-02-04
Applicant: APPLIC ELECTRONIQUES ETS
Abstract: 1,088,977. Ionization gauges. ETABLISSEMENT POUR APPLICATIONS ELECTRONIQUES. March 3, 1966 [March 11, 1965; Feb.4, 1966], No.18027/67. Divided out of 1,088,976. Heading G1N. The density or degree of purity of gases, vapours or fumes, is measured by an ionization chamber 2, Fig.4, which is connected in series with a reference ionization chamber 1, also open to the gas under investigation, the distance between the electrodes being arranged so that the chamber has a high ion-recombination rate. In this arrangement both chambers are sensitive to pressure variations in the ambient gas but the measuring chamber is also sensitive to variations occurring in the chemical nature and the degree of concentration of the ambient gas. In the embodiment, the two chambers form a potential divider to a supply source 3, the common point 4 between the chambers being connected to the gate electrode 8 of a metal-oxide semi-conductor device 9, to actuate a meter 11, or relay. Resistances 12, 14 and a negative temperature coefficient resistance 13 form a network compensating for temperature variations of M.O.S device. A load 10, which can be an alarm circuit, a wire or wireless remote control circuit of any electric load in general, which is required, may be inserted either in the source or drain circuit of the M.O.S. device. The ionization chamber 2 consists of a cylindrical perforated electrode (35), Fig. 6 (not shown), with a central cylindrical electrode (32) which carries the radioactive charge. The reference chamber comprises two parallel disc electrodes 5, 6, the former being adjustable on screw (27) to vary the spacing between the electrodes, screw (28) locking the arrangement in position. The radioactive source is placed in the centre of the disc 5. The two chambers are enclosed within an outer chamber (21), Fig. 5 (not shown), having windows (22), (23), covered with metal grids (24), through which the ambient gas can enter the device.
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公开(公告)号：CH440764A
公开(公告)日：1967-07-31
申请号：CH117462
申请日：1962-01-31
Applicant: CERBERUS AG WERK FUER ELEKTRON
Inventor： THOMAS LAMPART
IPC: G01N27/64 , G01N27/66 , G08B17/113 , H01J41/08
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公开(公告)号：LU48167A1
公开(公告)日：1966-09-12
申请号：LU48167
申请日：1965-03-11
Applicant: APPLIC ELECTRONIQUES ETS
Abstract: 1,088,977. Ionization gauges. ETABLISSEMENT POUR APPLICATIONS ELECTRONIQUES. March 3, 1966 [March 11, 1965; Feb.4, 1966], No.18027/67. Divided out of 1,088,976. Heading G1N. The density or degree of purity of gases, vapours or fumes, is measured by an ionization chamber 2, Fig.4, which is connected in series with a reference ionization chamber 1, also open to the gas under investigation, the distance between the electrodes being arranged so that the chamber has a high ion-recombination rate. In this arrangement both chambers are sensitive to pressure variations in the ambient gas but the measuring chamber is also sensitive to variations occurring in the chemical nature and the degree of concentration of the ambient gas. In the embodiment, the two chambers form a potential divider to a supply source 3, the common point 4 between the chambers being connected to the gate electrode 8 of a metal-oxide semi-conductor device 9, to actuate a meter 11, or relay. Resistances 12, 14 and a negative temperature coefficient resistance 13 form a network compensating for temperature variations of M.O.S device. A load 10, which can be an alarm circuit, a wire or wireless remote control circuit of any electric load in general, which is required, may be inserted either in the source or drain circuit of the M.O.S. device. The ionization chamber 2 consists of a cylindrical perforated electrode (35), Fig. 6 (not shown), with a central cylindrical electrode (32) which carries the radioactive charge. The reference chamber comprises two parallel disc electrodes 5, 6, the former being adjustable on screw (27) to vary the spacing between the electrodes, screw (28) locking the arrangement in position. The radioactive source is placed in the centre of the disc 5. The two chambers are enclosed within an outer chamber (21), Fig. 5 (not shown), having windows (22), (23), covered with metal grids (24), through which the ambient gas can enter the device.
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