DE4428423A1 - Measurement method for measuring flicker intensity of discharge lamp - Google Patents
Measurement method for measuring flicker intensity of discharge lampInfo
- Publication number
- DE4428423A1 DE4428423A1 DE19944428423 DE4428423A DE4428423A1 DE 4428423 A1 DE4428423 A1 DE 4428423A1 DE 19944428423 DE19944428423 DE 19944428423 DE 4428423 A DE4428423 A DE 4428423A DE 4428423 A1 DE4428423 A1 DE 4428423A1
- Authority
- DE
- Germany
- Prior art keywords
- light
- luminous flux
- light source
- phi
- value
- 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.)
- Withdrawn
Links
- 238000000691 measurement method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 230000035945 sensitivity Effects 0.000 claims abstract 3
- 230000004907 flux Effects 0.000 claims description 22
- 230000003595 spectral effect Effects 0.000 claims 2
- 241000282412 Homo Species 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
- G01J1/18—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors using comparison with a reference electric value
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
- H05B41/3922—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations and measurement of the incident light
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Erfassung und Anzeige des Flackerns im Licht eines von einer Lichtquelle erzeugten Lichtes, insbesondere Licht von LeuchtstofflampenThe invention relates to a method and a device to detect and display the flickering in the light of one of a light source generated light, in particular light from Fluorescent lamps
Unter Flackern versteht der Fachmann regelmäßige oder unre gelmäßige Schwankungen der Beleuchtungsstärke eines Lichtes, die bewußt oder unbewußt vom Menschen wahrnehmbar sind. Solche Lichtstromschwankungen bei Leuchtstofflampen können von Netzfrequenzschwankungen oder ebenso auch von Netzspannungsschwankungen verursacht werden. Bei diesen Lichtstromschwankungen wirken sich insbesondere die Schwan kungen mit einer Wiederholungsrate im Bereich bis 50 Hz störend aus. Höherfrequente Schwankungen werden zumindest vom menschlichen Auge nicht mehr wahrgenommen.The expert understands flickering regularly or incorrectly regular fluctuations in the illuminance of a Light that is consciously or unconsciously perceivable by humans are. Such luminous flux fluctuations in fluorescent lamps can from network frequency fluctuations or also from Mains voltage fluctuations are caused. With these Luminous flux fluctuations affect the swan in particular with a repetition rate in the range up to 50 Hz annoying. Higher frequency fluctuations are at least no longer perceived by the human eye.
Gerade in der Luftfahrt wird eine hohe Qualität der Be leuchtung gefordert, weil in kritischen Situationen Fluggä ste nicht noch durch an sich harmlose Lichtschwankungen beunruhigt werden dürfen. Ein solcher beunruhigender Ein druck entsteht oftmals durch das Flackern von Leucht stofflampen, weshalb in der Praxis ein großer technischer Aufwand betrieben wird, die geschilderten Beleuchtungsstär keschwankungen grundsätzlich zu vermeiden.Especially in aviation, the quality of the Be lighting required because in critical situations passengers not yet caused by harmless light fluctuations may be worried. Such a worrying one pressure is often created by flickering lights fabric lamps, which is why in practice a great technical Effort is operated, the illuminance described Avoid fluctuations in principle.
Es ist Aufgabe der Erfindung, ein Verfahren der eingangs genannten Art zu schaffen, welches eine quantitative Erfas sung und Anzeige des Flackerns im Licht mit einfachen technischen Mitteln ermöglicht. Darüberhinaus ist es Aufgabe der Erfindung, eine geeignete Vorrichtung zur Durchführung des Verfahrens zu schaffen.It is an object of the invention, a method of the beginning to create the type mentioned, which a quantitative recording solution and display of flickering in the light with simple enables technical means. Furthermore, it is Object of the invention, a suitable device for To carry out the procedure.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruches 1 gelöst. Erfinderische Ausgestaltungen dieses Lösungsgedankens sind den Unteransprüchen 2 bis 4 zu entnehmen. Die Vorrichtungsaufgabe wird entsprechend den Merkmalen vom Patentanspruch 5 gelöst.This object is achieved by the features of Claim 1 solved. Inventive designs this idea of the solution is dependent on subclaims 2 to 4 remove. The device task is according to the Features solved by claim 5.
Der Vorteil der Erfindung liegt darin, daß die Bewertung der Lichtqualität durch das beschriebene Meßverfahren ob jektiv erfolgt und damit unabhängig von subjektiv urteilen den Testpersonen ist. Ferner ist das Meßverfahren auch un ter den Bedingungen der Serienfertigung einsetzbar. Das in den Patentansprüchen beschriebene Verfahren dient zur quan titativen Feststellung des im Licht enthaltenen Flackerns, dessen Wert durch den ZusammenhangThe advantage of the invention is that the evaluation the quality of light by the measurement method described above takes place jective and is therefore independent of subjective judgments the test subjects. Furthermore, the measuring method is also un applicable under the conditions of series production. This in The method described in the claims serves for quan quantitative determination of the flickering contained in the light, its value through context
ausgedrückt wird.is expressed.
In dieser Beziehung steht FL für das Flackern des Lichtes in Prozent, Φmax für den absoluten Maximalwert des Licht stroms innerhalb einer Meßperiode, gemessen in Lumen, und Φmin für den absoluten Minimalwert des Lichtstroms inner halb einer Meßperiode, ebenfalls gemessen in Lumen.In this regard, FL stands for the flickering of the light in percent, Φ max for the absolute maximum value of the luminous flux within a measurement period, measured in lumens, and Φ min for the absolute minimum value of the luminous flux within a measurement period, also measured in lumens.
Das Flackern im Licht wird also als das Verhältnis eines Schwankungsanteils im Lichtstrom (dynamischer Anteil) zum Mittelwert desselben Lichtstroms (statischer Anteil) ver standen.The flickering in the light is thus considered the ratio of one Fluctuation component in the luminous flux (dynamic component) for Average of the same luminous flux (static component) ver stood.
Die zu untersuchende Lichtquelle erzeugt den gemittelten Lichtstrom, welchem der dynamische Lichtstromanteil überla gert ist.The light source to be examined produces the averaged one Luminous flux to which the dynamic luminous flux component device.
Entsprechend dem Prinzip des Verfahrens zur Erfassung und Anzeige des Flackerns im Licht ist vorgesehen, das Licht mit Hilfe eines spektral korrigierten (an die Empfindlich keit des menschlichen Auges angepaßten) Sensors in ein elektrisches Signal umzuwandeln, den gemittelten Lichtstrom und den dynamischen Lichtstrom getrennt voneinander elek tronisch zu erfassen, um schließlich daraus das im Licht enthaltene Flackern zu bestimmen. Ein elektrisches Filter verhindert, daß die nicht wahrnehmbaren Lichtstromschwan kungen in das Meßergebnis einfließen. Ein wesentlicher Be standteil des Meßverfahrens ist die Definition einer glei tenden Meßperiode, innerhalb der die Werte für den absolu ten Maximalwert und den absoluten Minimalwert des Licht stroms erfaßt werden.According to the principle of the procedure for recording and Display of flickering in the light is provided, the light with the help of a spectrally corrected (to the sensitive adapted to the human eye) convert electrical signal, the averaged luminous flux and the dynamic luminous flux separately to grasp it tronically, in order to finally derive it from it in light to determine the flickering contained. An electrical filter prevents the imperceptible luminous flux swan influence the measurement result. An essential part Part of the measuring process is the definition of a same tendency measurement period within which the values for the absolute th maximum value and the absolute minimum value of the light currents are detected.
In der Zeichnung ist ein Beispiel der Erfindung anhand ei nes Blockschaltbildes dargestellt.In the drawing is an example of the invention based on egg Nes block diagram shown.
Das von einer Lichtquelle 1 erzeugte Licht 2 wird durch einen Lichtsensor 3 erfaßt und in elektrische Signale umgewandelt. Die daraus gewonnene Spannung wird in einem Vorverstärker 4 verstärkt. Ein Tiefpaßfilter 5 dient dazu, die höherfrequenten Signalanteile, die außerhalb des menschlichen Wahrnehmungsbereiches liegen, aus den erfaßten Signalen zu eliminieren. Nach dem Tiefpaßfilter 5 erfolgt gleichzeitig die Messung der Spitzenwert-Amplitude des dy namischen Lichtstromanteils in einem Mini mum-Maximum-Spitzenwert-Detektor 6 und die Messung des Mittelwertes des Lichtstroms in einem parallel zum Spitzen wert-Detektor 6 geschalteten Gleichrichter 7. In dem Spit zenwert-Detektor 6 wird der WertThe light 2 generated by a light source 1 is detected by a light sensor 3 and converted into electrical signals. The voltage obtained from this is amplified in a preamplifier 4 . A low-pass filter 5 is used to eliminate the higher-frequency signal components that lie outside the human perception range from the detected signals. After the low-pass filter 5 , the measurement of the peak value amplitude of the dynamic luminous flux component takes place simultaneously in a mini mum maximum peak value detector 6 and the measurement of the mean value of the luminous flux in a rectifier 7 connected in parallel with the peak value detector 6 . The value is in the peak value detector 6
ΦDiff. = Φmax-Φmin Φ diff. = Φ max -Φ min
ermittelt. Der Gleichrichter 7 erzeugt das Signal des ge mittelten Lichtstroms mitdetermined. The rectifier 7 generates the signal of the average luminous flux
Ausgehend von dem letztgenannten Formelwert ist ein Ana log-Dividierer dem Spitzenwert-Detektor 6 und dem Gleich richter 7 nachgeschaltet, der das Flacker-Signal als Span nungswert aufbereitet. Dieser Spannungswert ergibt sich zuStarting from the last-mentioned formula value, an analog divider is connected downstream of the peak value detector 6 and the rectifier 7 , which processes the flicker signal as a voltage value. This voltage value results in
Über einen Impedanzwandler 9 wird das erhaltene Flacker-Signal in einer Anzeigeeinrichtung 10 angezeigt. Entsprechend dem angezeigten Wert können daraufhin Maßnahmen zur Unterbindung des Flackerns vorgenommen werden.The flicker signal obtained is displayed in a display device 10 via an impedance converter 9 . Measures to prevent flickering can then be carried out in accordance with the displayed value.
Die übereinstimmende Zeitkonstante in dem Spitzen wert-Detektor 6 und in dem Gleichrichter 7 definiert die Dauer der gleitenden Meßperiode, innerhalb welcher die Werte für den absoluten Maximalwert des Lichtstroms und für den absoluten Minimalwert des Lichtstroms innerhalb einer Meßperiode erfaßt werden.The corresponding time constant in the peak value detector 6 and in the rectifier 7 defines the duration of the sliding measuring period within which the values for the absolute maximum value of the luminous flux and for the absolute minimum value of the luminous flux are detected within a measuring period.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944428423 DE4428423A1 (en) | 1994-08-11 | 1994-08-11 | Measurement method for measuring flicker intensity of discharge lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944428423 DE4428423A1 (en) | 1994-08-11 | 1994-08-11 | Measurement method for measuring flicker intensity of discharge lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4428423A1 true DE4428423A1 (en) | 1996-02-15 |
Family
ID=6525424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19944428423 Withdrawn DE4428423A1 (en) | 1994-08-11 | 1994-08-11 | Measurement method for measuring flicker intensity of discharge lamp |
Country Status (1)
Country | Link |
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DE (1) | DE4428423A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1067824A2 (en) * | 1999-07-09 | 2001-01-10 | Dialight Corporation | LED driving circuitry with light intensity feedback to control output light intensity of an LED |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3238690A1 (en) * | 1982-10-19 | 1984-04-19 | Siemens AG, 1000 Berlin und 8000 München | METHOD AND ARRANGEMENT FOR EVALUATING AMPLITUDE CHANGES IN THE OUTPUT SIGNAL OF AN OPTICAL SENSOR |
US4464049A (en) * | 1982-01-07 | 1984-08-07 | Westinghouse Electric Corp. | Illumination flicker meter |
DE4025939A1 (en) * | 1990-08-16 | 1992-02-20 | Diehl Gmbh & Co | CIRCUIT ARRANGEMENT FOR THE OPERATION OF A FLUORESCENT LAMP |
-
1994
- 1994-08-11 DE DE19944428423 patent/DE4428423A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4464049A (en) * | 1982-01-07 | 1984-08-07 | Westinghouse Electric Corp. | Illumination flicker meter |
DE3238690A1 (en) * | 1982-10-19 | 1984-04-19 | Siemens AG, 1000 Berlin und 8000 München | METHOD AND ARRANGEMENT FOR EVALUATING AMPLITUDE CHANGES IN THE OUTPUT SIGNAL OF AN OPTICAL SENSOR |
DE4025939A1 (en) * | 1990-08-16 | 1992-02-20 | Diehl Gmbh & Co | CIRCUIT ARRANGEMENT FOR THE OPERATION OF A FLUORESCENT LAMP |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1067824A2 (en) * | 1999-07-09 | 2001-01-10 | Dialight Corporation | LED driving circuitry with light intensity feedback to control output light intensity of an LED |
EP1067824A3 (en) * | 1999-07-09 | 2004-01-07 | Dialight Corporation | LED driving circuitry with light intensity feedback to control output light intensity of an LED |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8127 | New person/name/address of the applicant |
Owner name: DIEHL STIFTUNG & CO., 90478 NUERNBERG, DE |
|
8139 | Disposal/non-payment of the annual fee |