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    3.
    发明专利
    未知

    公开(公告)号：DE1526223A1

    公开(公告)日：1969-12-04

    申请号：DE1526223

    申请日：1966-09-02

    Applicant: ELECTRONICS CORP AMERICA

    Inventor： GIUFFRIDA PHILIP ,  PRATT JOHN

    IPC: F23N5/08

    Abstract: 1,101,630. Photo-electric flame sensor. ELECTRONICS CORPORATION OF AMERICA. Aug.18, 1966 [Sept.2, 1965], No. 36983/66. Heading G1A. An avalanche breakdown type of detector sensing ultraviolet radiation from a flame is fed with A. C. via a circuit which is resonant at a frequency substantially greater than the A. C. frequency. When the detector is in its low impedance avalanche breakdown, so that each half cycle current flow through the detector upon avalanche is quenched before the A. C. changes polarity. As shown in Fig. 2 600V. A. C. are fed to a detector 116, comprising tungsten electrodes in a hydrogen atmosphere, through capacitor 112 and inductance 120 which together form the required resonance circuit. The inductance 120, which is an autotransformer, reflects pulses created by each half cycle avalanche via diodes 134, 136 to charge capacitor 150 which slowly discharges into capacitor 164. If pulses arrive at a sufficient rate, the controlled rectifier 160 is made conductive and current flows through relay coil 162. A capacitor may be provided on the primary side of transformer 100 to provide a circuit which is resonant at the A. C. frequency. In another arrangement Fig. 1 (not shown) the detector is in the secondary circuit of an autotransformer whose primary circuit together with a capacitor forms a circuit which is resonant at the A. C. frequency when the detector has not broken down but resonant at a much higher frequency when the detector has broken down. Circuitry for collecting the breakdown pulses is similar to Fig. 2. In a third arrangement Fig. 3 (not shown), the required resonant circuit comprises a capacitor bridging the detector and inductor in series.

    6.
    发明专利
    未知

    公开(公告)号：DE1451605A1

    公开(公告)日：1969-02-13

    申请号：DE1451605

    申请日：1964-02-20

    Applicant: ELECTRONICS CORP AMERICA

    Inventor： GIUFFRIDA PHILIP ,  PRATT JOHN

    IPC: F23N5/08 ,  G01T7/12 ,  G08B17/12

    Abstract: 1,014,928. Sensing conditions photo-electrically. ELECTRONICS CORPORATION OF AMERICA. Feb. 19, 1964 [Feb. 21,1963], No. 6992/64. Addition to 993,506. Heading G1A. The condition sensing apparatus of the parent Specification in which an avalanche breakdown radiation detector is connected in the secondary of a step-up transformer, the primary being connected to an A.C. source, is modified by the inclusion of a capacitor in the primary circuit to make the primary circuit series resonant when the detector has a high impedance and non-resonant when the detector is in avalanche breakdown. As described the transformer is an autotransformer 16 with detector 20 across the whole winding 18 and capacitor 14 in series with the primary section 19 of the winding. The ferrite-core inductors 30, 32 have a low impedence to the A.C. frequency, but a high impedance at 3kc/s to detect the pulses reflected into the primary on avalanche in detector 20. These pulses are passed by diodes 36, 38 to charge a capacitor 46 which discharges slowly into a capacitor 48. So long as diodes 36, 38 pass pulsesatat least 3 per second, the controlled rectifier 64 is made conductive and current flows through the relay coil 66. The condition sensed may be the presence or absence of a flame.

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