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EP0631265B1 - Dispositif détecteur optique pour la surveillance d'environnement et l'indication d'un milieu perturbateur - Google Patents

Dispositif détecteur optique pour la surveillance d'environnement et l'indication d'un milieu perturbateur Download PDF

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Publication number
EP0631265B1
EP0631265B1 EP94109718A EP94109718A EP0631265B1 EP 0631265 B1 EP0631265 B1 EP 0631265B1 EP 94109718 A EP94109718 A EP 94109718A EP 94109718 A EP94109718 A EP 94109718A EP 0631265 B1 EP0631265 B1 EP 0631265B1
Authority
EP
European Patent Office
Prior art keywords
signal
computer
comparison signal
correction value
measuring
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 - Lifetime
Application number
EP94109718A
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German (de)
English (en)
Other versions
EP0631265A1 (fr
Inventor
Michael Sommer
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.)
Hekatron GmbH
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Hekatron GmbH
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Filing date
Publication date
Application filed by Hekatron GmbH filed Critical Hekatron GmbH
Publication of EP0631265A1 publication Critical patent/EP0631265A1/fr
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Publication of EP0631265B1 publication Critical patent/EP0631265B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system

Definitions

  • the invention relates to a circuit arrangement for a optical detector based on the transmitted light principle for environmental monitoring and display of an interference medium (gas or smoke) a light source that is both exposed to the interference medium Measuring beam path a measuring photo cell as well as one of the interference medium exposed reference beam path irradiates a reference photocell, from the comparison of that of the measuring photocell and the reference photocell emitted received signals derived a comparison signal becomes.
  • an interference medium gas or smoke
  • CH-PS 571 750 it is also a photoelectric aerosol detector known with a radiation source that works according to the scattered light principle is working.
  • This detector uses a prism over which the measuring beams be directed into a light trap from which by present Aerosol scattered light is diverted onto a measuring photocell.
  • the prism also carries a reference beam path in which a part of the light originating from a single light source, that is also the light Measuring beam path feeds, redirected and fed to a reference photo cell becomes.
  • Measurement photo cell and reference photo cell form branches of one Bridge circuit, with which the evaluation is then carried out in a known manner different currents of the photocells is made.
  • the only light source is as shown in the associated Fig. 1 to an incandescent lamp, the light through a converging lens is summarized before entering the prism. Other information about the light source is not included in the publication.
  • DE-AS-2 702 933 in which one Fire detection device is described with a single light emitting diode as a light source as well as a measuring photo cell and a reference photo cell is working.
  • the reference photo cell is used here exclusively for temperature compensation, because it is optically isolated and changes in temperature of the Ambient air follows with a delay.
  • the measurement photo cell and the reference photo cell are the same as in the above treated Technology placed in a bridge circuit, which then in the usual way Brings about evaluation.
  • US-A-4,266,220 shows a transmitted light detector Measuring and reference beam path of the comparison signal obtained compared to a reference value. This The reference value is tracked for long-term system changes To take into account. However, this patent does no statement about how this tracking is realized.
  • the invention has for its object the circuit arrangement according to the invention to be able to adjust so that falsifications of measurement errors e.g. B. due to tolerances of the components or due to aging, Pollution and the like can not appear.
  • This object is achieved in that the received signals (measurement signal Reference signal) after their conversion into corresponding binary signals be fed to a computer, which is initially used to correct a Error of the comparison signal when the measuring beam path is free of interference medium saves a calculated difference of the binary signals as a correction value and in the subsequent environmental monitoring with this correction value corrected comparison signal determined.
  • the computer delivers evaluating each of the binary signals fed to it, a difference value, which represents the necessary correction value, which is the difference the received signals at the measuring photocell and at the reference photocell represents. This difference value can then during the Environmental monitoring offset against the determined comparison signal which always results in the desired correction.
  • both the method of apply in-phase as well as phase-shifted delivery of the flashes of light, where in the phase-shifted delivery of the flashes of light Computer allows a specific indication of the interference medium.
  • the computer can also advantageously be used to generate the comparison signal consult in environmental monitoring by: the computer the measurement signal and the reference signal with each other so linked that the comparison signal determined thereby by the correction value is constantly corrected.
  • the two Receive signals namely measurement signal and reference signal, according to their Conversion into corresponding binary signals compared by the computer, the desired comparison signal, possibly by the Correction value corrected, results.
  • this correction value can be done regularly, e.g. B. everyone Today, be carried out by doing this investigation is triggered by a command transmitted to the computer separately.
  • This command can be from a remote location, such as a Monitoring center are fed to the computer, so that at any time the correction value can be determined, provided that for the The measuring beam path is free of interference medium at the relevant time. If necessary, this must be ensured by means of an appropriate measure.
  • the computer itself can also determine the correction value are triggered, which then in particular at regular intervals, for.
  • B. Daily determination of the correction value at a specific time carries out. As a result, the determination of the correction value is automated, which is easily done by a known, entered the computer Clock can be carried out.
  • the detector remains due to the constant determination of the correction value always adapted to its conditions, so that the considerable signal-to-noise ratio resulting from the correction value constantly because of the constant adjustment of the correction value preserved.
  • the computer can also be used advantageously to trigger an alarm Response threshold of the comparison signal by a computer to change separately transmitted command. Because of the calculator its determination of the comparison signal for triggering an alarm If a response threshold is exceeded, it is possible to the calculator z. B. to control from a central office and this to transmit a command with which the response threshold is raised or lowered. In this way, if necessary, adapt the detector to different operating situations.
  • FIG. 1 shows the only in terms its basic structure, according to the transmitted light principle working detector 1, which consists of several one behind the other
  • chambers namely chamber 2 with the two light sources L1 and L2.
  • the chamber 2 is light-tight against the environment and also does not allow any interference medium to enter the Chamber.
  • the light coming from the light source L1 is dotted Lines shown by the light source L2 by dashed lines Lines.
  • the two light sources L1 and L2 are arranged so that the light emanating from them is essentially uniform in the chamber mixes.
  • the chamber 2 is through the translucent wall 3, especially a glass plate, closed off so that from the light sources L1 and L2 outgoing light the two neighboring chambers 4 and 5 evenly flooded due to the light and gas tight Partition 6 are partitioned off from each other.
  • the chamber 4 is with the Environment connected by several openings 7, so that in the chamber 4 any disturbing medium present in the environment, in particular Gas or smoke, can occur and therefore the inside of the Chamber 4 met. Because of the presence of the partition 6 remains the chamber 5 always free of interference medium.
  • the two chambers 8 and 9 are connected to the chambers 4 and 5 on, the two chambers 4 and 5 and the chambers 8 and 9 through a translucent wall 10, in particular a glass plate, are separated from each other. That of the Light sources L1 and L2 thus exit light from the chambers 4 and 5 in the chambers 8 and 9, of which the chamber 8 with the measuring photocell 11 and the chamber 9 with the reference photocell 12 are provided.
  • the two chambers 8 and 9 are separated from each other by the Partition 13 separated, the two chambers 8 and 9 light and sealed off from one another in a gastight manner.
  • the chamber 8 plays the role of a measurement receiving chamber.
  • the light emitted by the two light sources L1 and L2 also reaches the reference photo cell 12 via the reference chamber 5, specifically because of the design of chambers 2, 5 and 9 unaffected by any Interference medium, so that the chamber 9 the role of a reference receiving chamber plays.
  • the detector 1 thus has one of the two light sources L1 and L2 outgoing measuring beam path through the chambers 2, 4 and 8 up to the measuring photo cell 11.
  • Both the measurement photocell 11 and Reference photocell 12 light from both light sources L1 and L2, the how said above, the chamber 2 mixed substantially uniformly over leaves the permeable wall 3.
  • the measuring photocell 11 emits a received signal that compared to the received signal emitted by the reference photo cell 12 is weakened.
  • the two from the measurement photo cell 11 and the reference photo cell 12 emitted received signals Sm and Sr are the comparator V, the a comparison signal Sv is determined from this and this to the threshold switch 14 feeds and / or fed to a computer R, as in Connection with Figures 2 and 3 is explained. If exceeded the threshold value 14 enters the threshold value concerned Alarm signal Sa ab.
  • the two light sources L1 and L2 are in one from the clock generator T clocked certain frequency, which e.g. Is 1 Hz.
  • the clock generator T clocked certain frequency which e.g. Is 1 Hz.
  • the flashes of light then represent a kind of carrier frequency for the the measurement photocell 11 and the reference photocell 12 received signals Sm and Sr represent, the latter being different from the carrier frequency can be easily separated, e.g. in the simplest case by managing the Receive signals Sm and Sr via a capacitor. In this way can any in the received signal Sm and Sr included DC components that lead to falsification of the comparison signal could suppress.
  • the light sources L1 and L2 exist this purpose from semiconductor light emitters with different Light spectrum that is largely seamless over a corresponding extends over a wide frequency range.
  • the light sources L1 and L2 can either control in phase or out of phase, for which the clock generator in is known to be designed accordingly.
  • Figure 2 shows a circuit, such as in connection with a detector 1 can be used.
  • the circuit according to figure 1 contains three light sources L3, L4 and L5, which consist of semiconductor light emitters exist with different light spectrum.
  • the of Light rays emerging from the light sources L3, L4 and L5 are as follows shown: Starting from light source L3 as a dash-dotted line Lines starting from light source L4 as dashed lines and starting from from light source L5 as dotted lines. That of the three light sources L3, L4 and L5 outgoing light radiation strikes the measuring photo cell 15 and the reference photo cell 16, the relevant Light rays pass through chambers as shown in FIG. 1.
  • the light radiation striking the reference photo cells 16 passes through that is, a reference beam path, while that on the measurement photocell 15 striking light radiation passes through a measuring beam path, the Radiation in the measuring beam path, possibly through an interference medium is influenced, as in connection with that shown in Figure 1 Detector 1 is explained above.
  • the three light sources L3, L4 and L5 are each individually by one individual clock generator 17, 18 and 19 operated, so that accordingly the description of FIG. 1 corresponds to the three light sources L3, L4 and L5 Give off flashes of light. These flashes of light can either are delivered in phase or out of phase, from which the effects indicated above result.
  • the measuring photocell 15 controls the measuring amplifier 20, one of which Measured photocell 15 originating received signal emits and over the capacitor 21 and the resistor 22 to the one input 23 of the Differential amplifier 24 supplies.
  • the other input 25 of the differential amplifier 24 receives its input voltage from the reference photo cell 16, which drives the reference amplifier 26, whose output signal as amplified received signal via the capacitor 27 and the resistor 28 is fed to the above-mentioned input 25.
  • the differential amplifier 24 converts the to Switching points 31 and 32 pending voltages in the event of a difference of these voltages in the comparison signal output at its output B.
  • the signals present at outputs A, B and C according to FIG. 2 are evaluated by means of the computer R shown in FIG. 3, why the circuit of Figure 3 with its connections A ", B" and C "is connected to the outputs A, B and C according to FIG. 2.
  • the output C of the circuit according to FIG. 2 corresponds to that Switching point 32 at which the output from the reference photo cell 16 and increased reference voltage is present.
  • Different spectral sensitivity curves of the photocells 15 and 16 must be taken into account in the light sources L3, L4 and L5 containing circuits each have a resistor 56, 57 and 58 switched on, which is optionally adjustable. These resistances become like this set that each of one of the light sources L3, L4 and L5 individually emitted light flashes on the photocell 15 and 16, respectively generate the same tension.
  • the circuit according to FIG. 3 allows two variants of the connection the circuit according to FIG. 2.
  • variant 1 at of the comparison signal present at output B of the circuit according to FIG. 2 is exploited.
  • the circuit is according to Figure 3 via their connections B “to the output B and C” to the Output C connected. This means that the connections B “and C” the comparison signal and the reference signal in an analog manner.
  • Both signals are then through the ADC1 and ADC1 ADC2 converted into corresponding binary signals in a known manner.
  • the computer Exceeds the comparison signal emitted by the analog-digital converter ADC1 a certain numerical value (which corresponds to a threshold value), the computer outputs a signal at its computer output 52, which in 3, on the one hand a signal horn 53 and on the other hand a display instrument 54 activated. In the latter, it can be, for. B. act as a signal lamp.
  • the computer R now also determines that determined via the reference chamber 5 It can use the reference signal via the analog-to-digital converter ADC2 also in digital form that is present at connection C ' Reference signal that now before the actual environmental monitoring too an adjustment of the detector 1 and thus the entire system is used can be.
  • the measuring beam path is free of interference medium, it becomes of interference-free medium Measuring chamber 4 that of the analog-to-digital converter ADC1 supplied comparison signal with that from the analog-digital converter ADC2 supplied reference signal compared, in the case of ideal conditions the comparison signal should be zero. Since this is from the above Connection with the circuit according to Figure 2 reasons explained However, this is usually not the case, that is, the computer R also with complete Lack of interference medium to a certain extent deviating from the ideal value Signals from the two analog-digital converters ADC1 and ADC2 receives, the computer R can make a corresponding comparison calculation execute and store the difference determined in the memory M.
  • the computer can the difference stored in the memory M. take into account as a correction value so that Invoice to determine if a threshold value has been exceeded Correction value automatically taken into account. So the calculator only gives a signal at its computer output 52 when the supplied to it the comparison signal corrected by the correction value to the computer entered threshold exceeds.
  • the computer R constantly takes the one described above Determination of the correction value before. On the one hand, this can be done that the computer R does this on the basis of its command input 55 transmitted command. This can then be done, for example triggered by an operator every morning.
  • the computer R is also a clock U assigned to the computer in a known manner automatically certain time intervals, for example every morning or every evening activated accordingly.
  • the computer R according to variant 2 is used as follows:
  • the circuit according to FIG. 3 is connected to the terminal A ′′ Output A according to Figure 2 and with its connection C "to the output C connected according to Figure 2.
  • Output A agrees with the switching point 31 in Figure 2, i.e. H. on it is the one from the measuring amplifier 20 increased measuring voltage.
  • the computer receives R after conversion into binary signals via the ADC1 analog-digital converter and ADC2 both the measurement voltage and the reference voltage, so that the computer can use this to calculate the reference voltage (which in the circuit of Figure 2 determined by means of the differential amplifier 24 becomes).
  • the computer therefore arranges a special differential amplifier superfluous, since it is easily able from the digitally supplied measuring voltage and the reference voltage the comparison signal to calculate. If this comparison signal exceeds one certain value, the computer activates R via its computer output 52 the signal generator 53 and the display instrument 54.
  • Variant 2 can also be used in conjunction with the variant 1 described determination of the correction value beforehand either on special orders or at regular intervals using the clock carry out.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Claims (5)

  1. Montage pour un avertisseur optique (1) fonctionnant en lumière transmise pour la surveillance de l'environnement et l'indication d'un fluide perturbateur (gaz ou fumée), avec une source lumineuse (L1, L2 ; L3, L4, L5) qui irradie à la fois une cellule photoélectrique de mesure (11, 15) par un trajet de rayons de mesure exposé au fluide perturbateur et une cellule photoélectrique de référence (12, 16) par un trajet de rayons de référence maintenu à l'écart du fluide perturbateur, un signal comparatif étant tiré de la comparaison des signaux de réception délivrés par la cellule photoélectrique de mesure (11, 15) et la cellule photoélectrique de référence (12, 16), caractérisé en ce que les signaux de réception (signal de mesure 31, signal de référence 32) sont, après leur transformation en signaux binaires correspondants, apportés à un calculateur (R) qui, en présence d'un trajet de rayons de mesure exempt de fluide perturbateur, afin de corriger une erreur du signal comparatif, mémorise d'abord comme valeur de correction la différence déterminée entre les signaux binaires et, lors de la surveillance consécutive de l'environnement, corrige avec cette valeur de correction le signal comparatif alors déterminé.
  2. Montage selon la revendication 1, caractérisé en ce qu'afin de produire le signal comparatif lors de la surveillance de l'environnement, le calculateur (R) lie entre eux le signal de mesure et le signal de référence de telle sorte que le signal comparatif est corrigé en permanence par la valeur de correction.
  3. Montage selon la revendication 1 ou 2, caractérisé en ce que la détermination de la valeur de correction est déclenchée par un ordre (55) transmis au calculateur (R).
  4. Montage selon la revendication 3, caractérisé en ce que le calculateur (R) déclenche lui-même (U) à intervalles réguliers l'ordre pour la détermination de la valeur de correction.
  5. Montage selon une des revendications 1 à 4, caractérisé en ce qu'un seuil de réponse du signal comparatif, déclenchant une alarme, est modifié par un ordre transmis séparément au calculateur (R).
EP94109718A 1993-06-23 1994-06-23 Dispositif détecteur optique pour la surveillance d'environnement et l'indication d'un milieu perturbateur Expired - Lifetime EP0631265B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4320861A DE4320861A1 (de) 1993-06-23 1993-06-23 Schaltungsanordnung für einen optischen Melder zur Umweltüberwachung und Anzeige eines Störmediums
DE4320861 1993-06-23

Publications (2)

Publication Number Publication Date
EP0631265A1 EP0631265A1 (fr) 1994-12-28
EP0631265B1 true EP0631265B1 (fr) 1998-08-19

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EP94109718A Expired - Lifetime EP0631265B1 (fr) 1993-06-23 1994-06-23 Dispositif détecteur optique pour la surveillance d'environnement et l'indication d'un milieu perturbateur

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EP (1) EP0631265B1 (fr)
AT (1) ATE170017T1 (fr)
DE (2) DE4320861A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20205340U1 (de) * 2002-04-06 2003-08-14 Hekatron Technik GmbH, 79295 Sulzburg Überwachungseinrichtung für Raumabschlüsse

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DE19512126C1 (de) * 1995-04-04 1996-09-05 Hekatron Gmbh Vorrichtung zum Detektieren eines Gases oder Aerosols
DE19925196C2 (de) * 1999-05-26 2001-12-13 Inst Chemo Biosensorik Gassensoranordnung
EP1349127A1 (fr) * 2002-03-28 2003-10-01 Siemens Building Technologies AG Capteur de fumée selon le principe d'extinction et son utilisation
DE102004006677A1 (de) * 2004-02-11 2005-09-15 Kendro Laboratory Products Gmbh Infrarot-Gassensor und Verfahren zur Gaskonzentrationsmessung mit diesem Sensor
DE102021208901A1 (de) * 2021-08-13 2023-02-16 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Überwachen einer optischen Messeinrichtung und optische Messeinrichtung

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DE20205340U1 (de) * 2002-04-06 2003-08-14 Hekatron Technik GmbH, 79295 Sulzburg Überwachungseinrichtung für Raumabschlüsse

Also Published As

Publication number Publication date
DE59406714D1 (de) 1998-09-24
EP0631265A1 (fr) 1994-12-28
ATE170017T1 (de) 1998-09-15
DE4320861A1 (de) 1995-01-05

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