EP0150233B1 - Méthode pour constater le raté de blocage d'un tube UV et dispositif pour la mise en oeuvre de la méthode - Google Patents

Méthode pour constater le raté de blocage d'un tube UV et dispositif pour la mise en oeuvre de la méthode Download PDF

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Publication number
EP0150233B1
EP0150233B1 EP19840100825 EP84100825A EP0150233B1 EP 0150233 B1 EP0150233 B1 EP 0150233B1 EP 19840100825 EP19840100825 EP 19840100825 EP 84100825 A EP84100825 A EP 84100825A EP 0150233 B1 EP0150233 B1 EP 0150233B1
Authority
EP
European Patent Office
Prior art keywords
tube
pulses
time
ignition
carrying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19840100825
Other languages
German (de)
English (en)
Other versions
EP0150233A1 (fr
Inventor
H.M. Loy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GTE Licht GmbH
Original Assignee
GTE Licht GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GTE Licht GmbH filed Critical GTE Licht GmbH
Priority to DE8484100825T priority Critical patent/DE3474606D1/de
Priority to EP19840100825 priority patent/EP0150233B1/fr
Publication of EP0150233A1 publication Critical patent/EP0150233A1/fr
Application granted granted Critical
Publication of EP0150233B1 publication Critical patent/EP0150233B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

Definitions

  • the invention relates to a method for determining the ignition of a UV tube for flame monitoring, the anode voltage of which has the form of periodic pulses, and a device for carrying out the method.
  • a method for determining the ignition of a UV tube for flame monitoring the anode voltage of which has the form of periodic pulses
  • a device for carrying out the method is known from DE-A-2 548 568.
  • ignition occurs, i.e. When using pure alternating voltage or one-way or two-way rectified alternating voltage, half-waves are ignited even if the tube is not exposed to UV radiation.
  • the effect of ignition can occur immediately after the tube has been manufactured, but also only in operation after a more or less long period of operation.
  • the disadvantage of the igniting effect is that the existence of a flame, e.g. B. a gas burner, is falsely faked.
  • the error can be recognized by the fact that the absence of output signals from the UV tube when the flame is switched off, e.g. B. is checked when the burner is not in operation.
  • the object of the invention is to provide a method and a device for determining the igniting of a UV tube for flame monitoring, by means of which the effect of the igniting when the flame is burning is recognized purely electrically without mechanics susceptible to malfunction.
  • the UV tube In the first operating mode, the UV tube is not operated in saturation, i.e. the UV radiation from the flame is not large enough to ignite each half-wave, i.e. the impulses scatter stochastically. Ignition takes place in every half-wave.
  • a stochastic pulse train must therefore be distinguished from a gapless pulse train.
  • the second mode of operation takes place in the state of saturation, ie with high UV intensity.
  • the ignition time of the UV tube is the time span from when the ignition voltage is reached until the discharge build-up is practically complete.
  • the ignition time is made up of the ignition spread time and the build-up time.
  • the ignition stray time is the time that passes after the ignition voltage is reached until a UV quant arrives from the radiation source, which is able to emit an electron from the cathode and trigger the discharge.
  • the ignition spread time therefore fluctuates statistically.
  • the subsequent build-up time is on the order of 10- 7 s.
  • the ignition time of a blower consists only of the build-up time, i.e. The statistical ignition spread time is eliminated, since the ignition is not triggered by UV quanta.
  • the anode voltage U a of the UV tube is a regular sequence of pulses and the corresponding output signal of the anode current 1 8 during the UV-irradiation by flame. No signal may appear without UV. Signal without UV means ignition.
  • a shift register 1 with stages A, B, C and D are supplied with the output signals of the UV tube at input 2, while clock pulses are applied to input 3, which are synchronous with the anode voltage.
  • the sequence of impulses from the UV tube is thus inserted serially into the register in a clock-controlled manner.
  • the function of the register is to transform the temporal sequence of the pulses of the UV tube into a simultaneous information of the signal states over a sequence of n bits.
  • a sequence of impulses must be available simultaneously for a longer period of time for evaluation. The recognition sharpness for the statistical distribution increases with the number of impulses. Only four bits are shown in Fig. 2, but a reasonable value is eight bits.
  • the stages of the shift register can be formed from bistable multivibrators or flip-flops.
  • the outputs of the stages of the shift register are connected to an AND gate 4.
  • a signal only appears at output 5 of the AND logic element if the tube has ignited in the n successive clock periods. This can be used as an alarm message.
  • the AND operation is not fulfilled, ie the output signal 5 is zero.
  • an anode current I a of the UV tube excited by the flame flows in the form of a statistical pulse sequence.
  • the anode current caused by the ignition is l a .
  • the UV tube 11 is fed by a rectangular generator 12.
  • the output signals of the UV tube 11 and the clock signals delayed by the delay element 13 are input into the register 14 with the stages A, B, C and D.
  • the outputs of the stages of the shift register 14 are connected to an AND gate 15.
  • the clock pulses U t effective at the register are delayed by the delay time t v compared to the anode voltage U a of the UV tube.
  • the leading edge of the clock pulses inserts the tube signals into the register.
  • a signal is inserted at every cycle. If the AND operation is fulfilled after n cycles, an alarm signal is output at the output of the AND operation element.
  • the ignition time t z fluctuates statistically.
  • the implementation can also be carried out analogously using a microprocessor.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (2)

1. Procédé de détermination du raté de blocage d'un tube UV (11) pour la surveillance des flammes, dont la tension anodique présente la forme d'impulsions périodiques, caractérisé en ce que, afin de différencier le raté de blocage des amorçages normaux pour un nombre déterminé (n) d'impulsions successives, on examine si le tube UV (11) s'amorce en une période de temps (ty) calculée par des instants significatifs de référence, les flancs de montée d'impulsion étant choisis comme instants significatifs de référence et la période fixe (ty) étant choisi inférieure à la durée d'amorçage (tz) prévisible.
2. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, comportant un registre à décalage (1, 14) avec n phases (A, B, C, D ...) auquel sont conduites d'une part les impulsions du tube UV (11) sous forme d'impulsions de commande et d'autre part les impulsions du signal de sortie du tube UV (11), ainsi qu'un opérateur logique ET (4, 15) monté en aval, caractérisé en ce qu'il est prévu un opérateur à retard (13) pour ralentir les impulsions de commande par rapport aux impulsions de signal.
EP19840100825 1984-01-26 1984-01-26 Méthode pour constater le raté de blocage d'un tube UV et dispositif pour la mise en oeuvre de la méthode Expired EP0150233B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8484100825T DE3474606D1 (en) 1984-01-26 1984-01-26 Method of determining the break-through of a uv tube and device for carrying out the method
EP19840100825 EP0150233B1 (fr) 1984-01-26 1984-01-26 Méthode pour constater le raté de blocage d'un tube UV et dispositif pour la mise en oeuvre de la méthode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19840100825 EP0150233B1 (fr) 1984-01-26 1984-01-26 Méthode pour constater le raté de blocage d'un tube UV et dispositif pour la mise en oeuvre de la méthode

Publications (2)

Publication Number Publication Date
EP0150233A1 EP0150233A1 (fr) 1985-08-07
EP0150233B1 true EP0150233B1 (fr) 1988-10-12

Family

ID=8191720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840100825 Expired EP0150233B1 (fr) 1984-01-26 1984-01-26 Méthode pour constater le raté de blocage d'un tube UV et dispositif pour la mise en oeuvre de la méthode

Country Status (2)

Country Link
EP (1) EP0150233B1 (fr)
DE (1) DE3474606D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2199656B (en) * 1987-01-07 1990-10-17 Graviner Ltd Detection of electromagnetic radiation
GB2417771B (en) 2004-09-07 2010-02-17 Kidde Ip Holdings Ltd Improvements in and relating to uv gas discharge tubes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543260A (en) * 1968-07-24 1970-11-24 Honeywell Inc Self checking interuder and fire detector units and system
GB1515116A (en) * 1974-11-05 1978-06-21 Graviner Ltd Methods and apparatus for optimising the response of transducers
US4455487A (en) * 1981-10-30 1984-06-19 Armtec Industries, Inc. Fire detection system with IR and UV ratio detector

Also Published As

Publication number Publication date
DE3474606D1 (en) 1988-11-17
EP0150233A1 (fr) 1985-08-07

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