WO2009046753A1 - Dispositif de mesure et procédé de mesure de l'intensité d'une lumière d'une source lumineuse - Google Patents

Dispositif de mesure et procédé de mesure de l'intensité d'une lumière d'une source lumineuse Download PDF

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Publication number
WO2009046753A1
WO2009046753A1 PCT/EP2007/060562 EP2007060562W WO2009046753A1 WO 2009046753 A1 WO2009046753 A1 WO 2009046753A1 EP 2007060562 W EP2007060562 W EP 2007060562W WO 2009046753 A1 WO2009046753 A1 WO 2009046753A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
light
light source
reference signal
unit
Prior art date
Application number
PCT/EP2007/060562
Other languages
German (de)
English (en)
Inventor
Oskar Schallmoser
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
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 Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Priority to PCT/EP2007/060562 priority Critical patent/WO2009046753A1/fr
Publication of WO2009046753A1 publication Critical patent/WO2009046753A1/fr

Links

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
    • G01J1/02—Details
    • G01J1/08—Arrangements of light sources specially adapted for photometry standard sources, also using luminescent or radioactive material
    • 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
    • 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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • 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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J2001/4238—Pulsed light

Definitions

  • the present invention relates to a measuring arrangement for measuring an intensity of a light of a light source comprising: a reference signal unit for providing a reference signal, a transmitting unit, a receiving ⁇ unit for receiving a reception measurement light, and means coupled to the receiving unit evaluation unit for loading ⁇ woman on top of the intensity of the Light of the light source dependent measurement signal.
  • the transmitting unit includes fully a drive unit for the light source to the Be ⁇ woman on top of a modulated with the reference signal operation signal and the light source, wherein the Anêtein ⁇ integrated is coupled to the light source so that the light source can be supplied with the operation signal.
  • the Emp ⁇ capturing unit is adapted for receiving a reception measurement light by ⁇ collectively light of the light source and for providing egg ⁇ nes reception signal which is dependent on the intensity of the measuring light receiving ⁇ .
  • the invention also relates to a method for measuring an intensity of a light of a light source.
  • the present invention basically relates to the problem of measuring the intensity (brightness) of the light of a light source in an environment in which stray light is present.
  • a light source may be in particular ⁇ sondere an LED.
  • a typical case of intensity measurement is a light source that is in its Intensity fluctuates, for example due to aging, and is readjusted by an intensity measurement.
  • Such an interference light is, for example, the ambient light. The superimposition of measurement light and stray light leads to a falsification of the measurement results.
  • Pulse width modulation (PWM) of the light to be measured The light is switched on and off quickly, generating a rectangular modulation signal.
  • the Stahlsig ⁇ nal is subtracted from the object signal by successive light and dark measurements, whereby an adjustment of the light to be measured by the Störlichtan negligence is possible.
  • the method only works if the disturbance light modulation frequency is not close to the PWM frequency.
  • the method is not applicable if the light intensity to be measured or regulated has to be constant due to the application or is to be modulated with another signal form.
  • Incident disturbing light is thereby basically faded out, except that which has the frequency of the modulation signal. This is a serious limitation of this method. Measurements in the presence of light sources that radiate on the modulation frequency or have a broad spectrum, for example, can not be performed.
  • Optical filters This suppresses spectral components in the interfering light that are outside the spectrum of the lying measuring signal. A large part of the interference signal is thereby masked out, but it remains a not eli ⁇ minierbarer noise component in the frequency range of the light to be measured. The problem here is similar, as in the modulation of light with a signal of constant frequency, in addition there is a lack of flexibility and ei ⁇ ne certain cumbersomeness due to the handling and the nature of optical filters.
  • the present invention is therefore based on the problem to create a measuring arrangement and a method of the type mentioned above such that a size ⁇ res range of applications is made possible than with the known prior art procedures.
  • the invention relates to a measuring arrangement for measuring an intensity of a light of a light source, comprising a reference signal unit for providing a reference signal, a transmitting unit with an on ⁇ control unit for the light source for providing ei ⁇ nes modulated with the reference signal operating signal, and with the light source, and a receiving unit for receiving a received measuring light comprising at least a subset of the light of the light source and for providing a received signal, which is dependent on the intensity of the received measuring light.
  • the driving ⁇ unit is coupled to the light source so that the light source ⁇ can be supplied with the operation signal.
  • the invention provides that the reference signal is a pseudonoise sequence ⁇ formed sequence of signal levels and the evaluation unit comprises at least one multiplier and at least one integration unit for integrating an output signal of the multiplier, wherein the multiplier coupled on the input side with the received signal and the reference ⁇ signal and the output side with the integration unit and the integration unit is designed for the output-side provision of the measurement signal.
  • the inventive method for measuring a Intensi ⁇ ty a light of a light source comprising the steps of: generating a reference signal as a pseudo noise sequence of signal levels, driving the light source with a modulated with the reference signal Radiosig ⁇ nal, receiving a reception measurement light through a Emp ⁇ capture unit, wherein the received measurement light comprises at least a subset of the light of the light source, providing a received signal by the receiving unit, where ⁇ the received signal depends on the intensity of the receiving ⁇ measuring light, providing a product signal by a multiplier, the product signal with the product is correlated from the received signal and the reference signal and integrating the product signal to egg ⁇ nem measurement signal.
  • the present invention is based on the finding that the above object can be achieved if the light whose intensity is to be measured is modulated with a reference signal that is generally orthogonal to harmonic signals.
  • a reference signal is a formed as a pseudo noise sequence or pseudonoise sequence from ⁇ sequence of signal levels.
  • the autocorrelation of the pseudonoise signal has a significantly higher value than the correlation with other signal sequences. Consequently, a pseudonoise signal additively added to any transmission signal can be precisely extracted from the received signal mixture and evaluated.
  • pseudo-noise mo ⁇ -modulated signal via the mentioned application in the Un ⁇ suppression of unwanted noise is also, advantageously, can also be used in light-transmission lines for regulating the light intensity transmitted.
  • a pseudo noise modu ⁇ lated signal is superimposed on the useful signal to be transmitted.
  • the pseudonoise signal is decoupled from the received signal mixture and fed back to the transmitter for controlling the light intensity. This works largely independently dependent on the modulation method of the useful signal used in the transmission.
  • the measuring arrangement is insensitive to rapid switching on and off of stray light.
  • immunity to interference is ensured with respect to simultaneous, independently operated interference sources or with respect to other light transmission paths, which are modulated, for example, with PWM.
  • the reference signal is cyclic, with a cycle having a presettable length.
  • the selectable Zyk ⁇ lus comprise one of the parameters that can be determined with a view to opti ⁇ male orthogonality of the reference signal to other signals.
  • the reference signal is formed as a sequence of discrete and / or continuous signal levels.
  • the reference signal over a cycle length is the average of zero, which contributes to noise light signals can be filtered out by a Mul ⁇ ti bearing with the reference signal and subsequent integration.
  • the reference signal is a series of binary high and low signal levels. With a view to a digital signal ⁇ processing in the transmitter and the receiver, such a design is particularly favorable.
  • the measuring arrangement is arranged such that it comprises interference light of at least one interference light source which is designed to emit at least one interference light.
  • the received measuring light results from the superposition of the light of the light source and the disturbing light.
  • Disturbance light which is modulated with one or more harmonic signals, can be faded out particularly effec- tively.
  • the operating signal is a signal with the reference korre ⁇ profiled current signal. With a high correlation si is ⁇ cheruci that the transmitted signal identifies the favorable for a Blend of noise characteristics of the reference signal.
  • the principle according to the invention is also effective when the reference signal and the operating signal are not maximally correlated, for example because the operating signal comprises another useful signal to be transmitted.
  • this configuration performs a control engineering Aufga ⁇ be.
  • the reference signal is to other signal sequences, in particular to harmonic signals and / or white noise and / or white light, such as daylight, or ⁇ thogonal.
  • harmonic signals and / or white noise and / or white light such as daylight, or ⁇ thogonal.
  • Extensive orthogonal to a multi ⁇ number of noise signals is practicable if the pseudo noise signal decor with dark ⁇ tet and is optimized according to specific criteria.
  • Cheap orthogonality inherent shanks allow efficient hiding of corresponding noise components.
  • the light source ⁇ comprises at least one light emitting diode and the receiving unit comprises at least a light-sensitive diode, a linear dependence between the Empfangssig- nal and the intensity of the received measuring light. This ensures that the received signal is sufficiently correlated with the operating signal, whereby the favorable orthogonality properties of the reference signal are fully usable.
  • the integrated Empfangsein ⁇ comprises an amplifier for amplifying the reception signal, the input of the amplifier to the reception ⁇ signal and the output of the amplifier is coupled to the input of the evaluation unit.
  • the kerausgang coupled to the reinforce- integration unit comprises before Trains t ⁇ a low pass filter.
  • the evaluation unit preferably comprises a demodulator for carrying out a synchronous demodulation of the received signal. This ensures that no phase shift exists between the reference signal and the received signal, whereby the Ortgon Rundeigentician of Refe rence ⁇ signal is optimally usable.
  • a measured at the output of the integration unit Messsig ⁇ nal has a linear dependence on an average of the intensity of the light transmitted from the light source, this dependence is determined by a constant Para ⁇ meter.
  • the absolute magnitude of the average value of the light intensity or the said parameters are determined by Ka ⁇ libr michs horren.
  • FIGURE shows the structure of a measuring arrangement according to the invention in a schematic representation.
  • the exemplary embodiment shown in FIG. 1 of a measuring arrangement initially has a reference signal unit 10 for providing a reference signal z to a transmitting unit 12 coupled thereto, which serves to provide a light ⁇ . Furthermore, an interference light source 14 is provided for providing an interference light ⁇ a , which is superposed on the light transmission path to the light ⁇ . A receiving unit 16 receives a received measuring light ⁇ e , resulting from the superposition of the light ⁇ and the disturbing light ⁇ a .
  • the reference signal unit 10 for providing a reference signal z to a transmitting unit 12 coupled thereto, which serves to provide a light ⁇ .
  • an interference light source 14 is provided for providing an interference light ⁇ a , which is superposed on the light transmission path to the light ⁇ .
  • a receiving unit 16 receives a received measuring light ⁇ e , resulting from the superposition of the light ⁇ and the disturbing light ⁇ a .
  • Receiving unit 16 provides a received signal s to an evaluation unit 18 coupled thereto, which depends on the intensity of the received measuring light ⁇ e .
  • the Auswer ⁇ teech 18 finally processes the received signal s and the reference signal z.
  • the transmitting unit 12 comprises a light source 20 and ei ⁇ ne drive unit 22 for providing a modulated with the reference signal z operating signal i.
  • the on ⁇ control unit 22 is coupled to the light source 20, so that the light source 20 with the operating signal i can be fed.
  • the receiving unit 16 includes, which is not shown in detail in the figure, a photosensitive diode and an amplifier connected thereto. Accordingly, the light source 20 comprises a light-emitting diode, preferably an LED.
  • the output signal of the amplifier is then Klaver ⁇ works either analog or digital. In the case of digital processing, it is sampled by a sample-and-hold stage at the input of an A / D converter. In this case, the multiplier 24 and the integration unit 26 also operate on a digital or numerical basis. In an analog processing, the integration unit 26 is realized by a low-pass filter.
  • the coupled with the receiving unit 16 evaluation unit 18 serves to provide a ⁇ of the intensity of the light from the light source 20 dependent measurement signal D.
  • the control unit 18 includes a multiplier 24 and ei ⁇ ne integration unit 26.
  • the multiplier 24 is the input side with the reception signal ⁇ and the latter is used with the refer- ence signal z supplied, and the output side coupled to the Integra ⁇ tion unit 26 for integrating an output signal d of the multiplier 24th
  • the multiplication is also feasible with multiple multipliers, which is not detailed in the figure.
  • first multiplier of the first multiplier is fed with a first modified reference signal which is obtained from the original Refe rence ⁇ signal, wherein the values of Refe rence ⁇ be converted signal is less than zero to zero.
  • the second multiplier is fed by a second modified reference signal derived from the original reference signal. received signal, wherein those values greater than zero are converted to zero.
  • the signals supplied by the multipliers are then separated voneinan ⁇ integrated.
  • the output signals of the integration units are subtracted from each other. The difference is the desired output signal of the evaluation unit.
  • the reference signal z is designed as a cyclic sequence pseudonoise sequence of discrete signal levels with the Pe ⁇ Riode T and the zero-mean formed, ie
  • the pseudonoise sequence has a mean of zero even if it is not cyclic, that is, for T -> ⁇ .
  • the reference signal z is seen to other signal sequences, in particular ⁇ sondere to harmonic signals and / or white suede, orthogonal. Summarizing such a signal sequence as a signal proportional to the disturbance light ⁇ a interfering light signal on, then the orthogonality between the reference signal z ⁇ and the interfering light signal as follows can be expressed:
  • the signal provided by the control unit 22 operation ⁇ ⁇ signal i is denmoduliert with the reference signal z as follows amplitu:
  • S 0 is a constant.
  • the Gl. (5a) can be simplified as follows: using the mean property in Eq. (Ia) is the first term of the sum is approximately equal to zero, and groove ⁇ wetting the orthogonality in Eq. (Ib), the third term of the sum is approximately equal to zero. Thus, the following results for the measurement signal D:
  • the measurement signal D is li ⁇ near dependent on the average intensity of the light ⁇ m to be measured.
  • the constant C in Eq. (6) are metrologically recorded.
  • a calibration measurement is carried out in advance of the actual measurement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

La présente invention concerne un dispositif de mesure conçu pour mesurer l'intensité d'une lumière (F ) d'une source lumineuse (20), comprenant une unité de signal de référence (10) conçue pour fournir un signal de référence (z) et une unité d'émission (12) qui comprend une unité de commande (22) pour la source lumineuse (20), conçue pour fournir un signal de fonctionnement (i) modulé avec le signal de référence (z), et la source lumineuse (20). L'unité de commande (22) est connectée à la source lumineuse (20) de manière à pouvoir fournir le signal de fonctionnement (i) à la source lumineuse (20). Le dispositif de mesure comprend également une unité de réception (16) conçue pour recevoir une lumière de mesure à recevoir ( F e ) comprenant au moins une partie de la lumière (F ) de la source lumineuse (20) et pour fournir un signal de réception (s) qui dépend de l'intensité de la lumière de mesure à recevoir ( F e ), ainsi qu'une unité d'analyse qui est connectée à l'unité de réception (16) et est conçue pour fournir un signal de mesure qui dépend de l'intensité de la lumière (F ) de la source lumineuse (20). Le signal de référence (z) est une séquence de niveaux de signal se présentant sous forme de séquence de bruits pseudo-aléatoires. L'unité d'analyse comprend au moins un multiplicateur (24) et au moins une unité d'intégration (26) conçue pour intégrer un signal de sortie (d) du multiplicateur (24). Le multiplicateur (24) est connecté côté entrée au signal de réception (s) et au signal de référence (z), et côté sortie à l'unité d'intégration. L'unité d'intégration est conçue pour fournir le signal de mesure côté sortie.
PCT/EP2007/060562 2007-10-04 2007-10-04 Dispositif de mesure et procédé de mesure de l'intensité d'une lumière d'une source lumineuse WO2009046753A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/060562 WO2009046753A1 (fr) 2007-10-04 2007-10-04 Dispositif de mesure et procédé de mesure de l'intensité d'une lumière d'une source lumineuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/060562 WO2009046753A1 (fr) 2007-10-04 2007-10-04 Dispositif de mesure et procédé de mesure de l'intensité d'une lumière d'une source lumineuse

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009093191A2 (fr) * 2008-01-25 2009-07-30 Koninklijke Philips Electronics N.V. Système d'éclairage comportant une source lumineuse, un contrôleur et un capteur de lumière

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0632262A1 (fr) * 1993-06-29 1995-01-04 Boehringer Mannheim Gmbh Procédé et dispositif pour déterminer et évaluer des signaux photométriques analogues d'un système d'analyse d'un support d'essai
USH1626H (en) * 1993-01-28 1997-01-07 Kersey; Alan D. Fiber optic network system with low crosstalk using code-division multiplexing
US5737077A (en) * 1994-05-31 1998-04-07 Recon Exploration Apparatus and method for time resolved spectroscopy
WO2006017798A1 (fr) * 2004-08-06 2006-02-16 UNITED STATES OF AMERICA as represented by THE SECRATARY OF THE NAVY Systemes de fibres optiques a reseau de detection differentielle virtuelle
US20060274022A1 (en) * 2003-03-28 2006-12-07 Mitsuo Ohashi Photometric device of liquid crystal display and liquid crystal display

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USH1626H (en) * 1993-01-28 1997-01-07 Kersey; Alan D. Fiber optic network system with low crosstalk using code-division multiplexing
EP0632262A1 (fr) * 1993-06-29 1995-01-04 Boehringer Mannheim Gmbh Procédé et dispositif pour déterminer et évaluer des signaux photométriques analogues d'un système d'analyse d'un support d'essai
US5737077A (en) * 1994-05-31 1998-04-07 Recon Exploration Apparatus and method for time resolved spectroscopy
US20060274022A1 (en) * 2003-03-28 2006-12-07 Mitsuo Ohashi Photometric device of liquid crystal display and liquid crystal display
WO2006017798A1 (fr) * 2004-08-06 2006-02-16 UNITED STATES OF AMERICA as represented by THE SECRATARY OF THE NAVY Systemes de fibres optiques a reseau de detection differentielle virtuelle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009093191A2 (fr) * 2008-01-25 2009-07-30 Koninklijke Philips Electronics N.V. Système d'éclairage comportant une source lumineuse, un contrôleur et un capteur de lumière
WO2009093191A3 (fr) * 2008-01-25 2009-10-29 Koninklijke Philips Electronics N.V. Système d'éclairage comportant une source lumineuse, un contrôleur et un capteur de lumière

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