WO2010140095A2 - Détecteur de lumière - Google Patents

Détecteur de lumière Download PDF

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Publication number
WO2010140095A2
WO2010140095A2 PCT/IB2010/052389 IB2010052389W WO2010140095A2 WO 2010140095 A2 WO2010140095 A2 WO 2010140095A2 IB 2010052389 W IB2010052389 W IB 2010052389W WO 2010140095 A2 WO2010140095 A2 WO 2010140095A2
Authority
WO
WIPO (PCT)
Prior art keywords
light
absorbing
detector
light absorbing
sensor
Prior art date
Application number
PCT/IB2010/052389
Other languages
English (en)
Other versions
WO2010140095A3 (fr
Inventor
Ties Van Bommel
Eduard Johannes Meijer
Rifat Ata Mustafa Hikmet
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2010140095A2 publication Critical patent/WO2010140095A2/fr
Publication of WO2010140095A3 publication Critical patent/WO2010140095A3/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
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/06—Restricting the angle of incident light
    • 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
    • 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
    • G01J1/0266—Field-of-view determination; Aiming or pointing of a photometer; Adjusting alignment; Encoding angular position; Size of the measurement area; Position tracking; Photodetection involving different fields of view for a single detector
    • 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
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • G01J1/06—Restricting the angle of incident light
    • G01J2001/063—Restricting the angle of incident light with selectable field of view
    • G01J2001/065—Restricting the angle of incident light with selectable field of view by changing elements

Definitions

  • the technical field of the present invention is lighting.
  • the present invention relates to a light detector for detecting light within an incident light angle range.
  • the other prerequisite is that the light attributes of the light sources, such as intensity, color point and color rendering index, can be monitored, preferably for multiple sources at the same time.
  • a control feedback system can then be realized that controls, monitors and adjusts light settings in a room according to the preferences of the user.
  • light detectors are required, for instance to measure the flux, the color point, or even the full spectral distribution of the light illuminating a certain part of the room.
  • EP08104428.1 discloses light detectors arranged to admit incident light within an angle range. In order to provide different incident angle ranges, several different light detecting sensors are required. In view of the above, it would therefore be desirable to achieve an improved light detector. In particular, it would be advantageous to achieve a light detector with an adjustable incident light angle range.
  • a light detector for detecting light within an incident light angle range
  • the light detector comprises: a light absorbing arrangement for blocking incident light outside the incident light angle range and for admitting incident light within the incident light angle range, and at least one sensor for detecting incident light admitted by the at least one light absorbing arrangement, wherein structural characteristics of said light absorbing arrangement are locally controllable between a light absorbing state and a non- absorbing state, thereby allowing adjustment of said incident light angle range.
  • the incident light angle range for which the sensor is able to detect incident light may be adjusted.
  • the tuning of the incident light angle range may provide for a more intelligent lighting system in which ambient light and lighting effects may be controlled with higher precision.
  • Local change of structural characteristics of a light absorbing arrangement is to be construed as at least a portion or part of the arrangement in question changing its light absorbing characteristics, i.e. the whole arrangement does not necessarily have to change its light absorbing characteristics. Further, it is to be understood that the structural characteristics may change from locally absorbing to locally non-absorbing and also from locally non- absorbing to locally absorbing.
  • Incident light angle range may be defined by an angle ⁇ where -90° ⁇ ⁇ ⁇ 90° with respect to a normal to a light receiving surface of the sensor.
  • the above range may be seen as forming a plane in which the angle can vary.
  • the angle ⁇ may vary from -90° ⁇ ⁇ ⁇ 90° along a normal axis of the above mentioned plane. Note that the incident angle range also may be divided into separate sub-ranges.
  • the at least one light absorbing arrangement may comprise at least two light absorbing elements arranged to extend from the sensor for admittance of light onto the sensor i
  • the incident light angle range may be contolled by controlling the light absorbance or non-absorbance of the various elements.
  • At least one of the elements may be movable in relation to another element, providing for easy adjustment of the incident angle range.
  • the light absorbing arrangement may comprise at least one chamber comprising a light absorbing fluid and adjusting means for adjusting a fluid level of the fluid in the chamber. By adjusting the fluid level of the at least one chamber, with respect to the light receiving surface, the incident light angle range may be adjusted.
  • the fluid level of each of the at least one light absorbing element may be individually controllable by the adjustment means. This provides an even greater freedom for adjustment of the incident light angle, possibly composed of several sub-ranges.
  • the adjusting means may be arranged to adjust the fluid level transversely to the light receiving surface.
  • the optical path to the sensor may be adjusted, i.e. the incident light angle range may be adjusted.
  • an increased level of light absorbing fluid in the light absorbing element may provide a smaller incident light angle range compared to that provided by a decreased level of light absorbing fluid therein.
  • the light absorbing arrangement may be electrically controllable between being locally absorbing and locally non-absorbing. For instance, by applying a voltage across electrodes of the light absorbing arrangement, the structural characteristics may be changed. By continuously adjusting the voltage level, the incident light angle range may be adjusted continuously.
  • the at least one light absorbing arrangement may comprise a chamber containing light absorbing particles and electrodes controlling the orientation of the light absorbing particles. Depending on the orientation of the light absorbing particles, light within a specific range may be admitted to the sensor.
  • the light detector may be used in a lighting system comprising at least one luminaire, and a control unit for controlling the at least one luminaire based on a light measurement by the at least one light detector.
  • a lighting parameter in this context is to be construed as e.g. an intensity, color point and color rendering index of the luminaire(s) in the system.
  • light effects can be controlled locally in e.g. a room comprising the lighting system.
  • user-specified ambient lighting can thereby be achieved.
  • Fig. 1 shows a schematic view of a light detector according to one embodiment of the invention.
  • Fig. 2 shows a schematic view of a lighting system comprising the light detector in Fig. 1.
  • Figs. 3-5 show various solutions for control of an incident light angle range.
  • Figs. 6a-b show an embodiment of the light detector in Fig. 1.
  • Figs. 7a-d show an embodiment of the light detector in Fig. 1.
  • Figs. 8a-c show an embodiment of the light detector in Fig. 1.
  • Fig. 9 shows an embodiment of the light detector in Fig. 1.
  • Fig. 10 shows an embodiment of the light detector in Fig. 1.
  • Fig. 1 la-f show an embodiment of the light detector in Fig. 1.
  • Fig. 12 shows a light detector with a rotatable light absorbing wall.
  • the light detector 1 in Fig.1 comprises inter alia at least one light absorbing arrangement 2, which is electrically controllable by applying a voltage thereon, and a light sensor 4 for sensing the light intensity of light incident on its surface 41.
  • a voltage By applying a voltage to the light absorbing arrangement 2, an incident light angle range ⁇ with respect to a light receiving surface of the sensor 4 can be adjusted.
  • the light detector 1 is adapted to selectively admit light from different angles in e.g. a room.
  • the sensor 4 can accept light within an acceptance range provided by the light absorbing arrangement 2. More specifically, the light absorbing arrangement 2 function as a controllable light absorber in the optical path to the sensor 4.
  • the light detector 1 can also comprise at least one filter 3, wherein the sensor 4 can detect a specific wavelength or wavelengths of incident light at different angles.
  • Fig. 2 an example of an application of the light detector 1 is shown.
  • the light detector 1 is for use in a lighting system 5 in which a control unit 7 can receive information regarding detected light from light detectors 1 , and communicate with luminaires 6a and 6b for control thereof.
  • the information can for instance be transmitted from the light detector 1 via a wireless network utilizing e.g. RF communication, Bluetooth or any other suitable protocol as would be apparent to the skilled artisan.
  • each data packet communicated by the light detector 1 can also comprise identification data in order for the light detector 1 to identify itself to the control unit 7.
  • the control unit 7 will know which light detector 1 provided the data packet.
  • the control unit can control the luminaires 6a and 6b according to a desired ambient lighting effect in the surroundings of the specific light detector 1.
  • the information can be transmitted by wire.
  • local lighting control in e.g. a room comprising the lighting system 5 can be achieved.
  • Local lighting control is to be understood in the sense that at a particular location in the room, light control is enhanced since a light detector 1 placed in the proximity of that particular location will be able to detect light from a specific direction or range of directions, whereby by means of the control unit 7, it can be decided which lighting device 6a or 6b should give rise to a specific ambient lighting effect in that particular location.
  • enhanced light control of that specific location can be achieved via the feedback of the information received by the sensor 4 and transmitted to the control unit 7, which controls the light output of luminaires in the system 5.
  • the control of luminaires 6a and 6b in Fig. 2 is enhanced and hence a more advanced lighting system can be achieved.
  • Luminaires 6a and 6b can have several controllable lighting parameters such as light intensity, color point and color rendering index.
  • Light detectors 1 can be placed freely in e.g. a room comprising lighting system 5.
  • a luminaire can comprise the light detector 1, as illustrated by luminaire 6b.
  • light detectors 1 By placement of light detectors 1 at locations in a room/space, it may be possible to determine a light intensity for a specific incident light angle range. In embodiments comprising the filter 3 the spectral content of incident light can also be determined.
  • Figs 3 to 5 show various solutions for control of an incident light angle range.
  • the light absorbing arrangement comprises two elements 20 extending from the sensor surface and being movable in relation to each other.
  • Fig. 3 shows the concept that a spacing between the elements 20 is changeable.
  • Fig. 4 shows the concept of an adjustable height of the elements 20.
  • Fig. 5 shows the concept of angles between the elements 20 being changeable.
  • Figs 6a-b show an embodiment of the light detector in Fig. 1.
  • the light absorbing arrangement 2 comprises a chamber 21 (e.g. an electro-wetting cell) comprising a light absorbing fluid 8 termed a first liquid phase.
  • the chamber 21 also comprises a non-absorbing fluid 8' termed a second liquid phase.
  • the first liquid phase 8 can e.g. contain a light absorbing dye or light absorbing particles.
  • the second liquid phase 8' is advantageously transparent.
  • the light absorbing arrangement is placed on a light receiving surface 41 of the sensor 4.
  • the first and second liquid phases 8 and 8' are immiscible liquid phases.
  • the first and second liquid phases 8 and 8' can be a first oil phase and a second aqueous phase respectively.
  • an interface between the first liquid phase 8 and the second liquid phase 8' can be tilted by applying a voltage across electrodes positioned in the light absorbing arrangement 2 (not shown).
  • the voltage applied to the light absorbing arrangement 2 results in an electrostatic potential that effectively modifies the surface potential energy.
  • the wettability of the first and the second liquid phases 8 and 8' is influenced.
  • intermediate states between the first and second liquid phases 8 and 8' is achievable (shown in Fig. 6b).
  • the acceptance range of incident light i.e. the incident light angle range
  • the light absorbing arrangement 2 also comprises light absorbing layer 9 for absorbing any light incident on sides of the light absorbing arrangement 2.
  • incident light within a selected incident light angle range will efficiently pass through the second liquid phase 8', wherein incident light outside the selected incident light angle range will efficiently be absorbed by the first liquid phase 8.
  • the sensor 4 can thus register incident light within the allowed incident light angle range.
  • Figs 7a-d show another embodiment of the light detector in Fig. 1.
  • the present embodiment utilizes the principles of electro-wetting. The general idea is to adjust the light absorbing fluid level in the light absorbing arrangement 2 in a plane transverse to the light receiving surface of the sensor 4.
  • the light absorbing arrangement 2 comprises a chamber 21 containing the light absorbing fluid 8 referred to as first liquid phase 8.
  • the chamber 21 may also comprise a second liquid phase 8'. Examples of first and second liquid phases 8 and 8' are described with reference to Figs 6a-b above.
  • the chamber 21 extends from the light receiving surface 41, and an absorbing element 8" is arranged next to the chamber 21.
  • an absorbing element 8" is arranged next to the chamber 21.
  • absorbing elements 8" are arranged on either side of the chamber 21, resulting in an incident light angle range comprised of two sub-ranges, one on either side of the chamber.
  • the arrangement comprises two chambers 21, providing control of the incident light angle range from both sides with respect to the normal of the light receiving surface 41.
  • the incident light is admitted between the chambers 21 to the light receiving surface 41.
  • FIG. 7d several chambers 21 are arranged on the sensor, with an incident light angle range defined between each adjacent pair of chambers.
  • the chambers are connected to a common reservoir of light absorbing fluid.
  • Fig. 8 shows a variation of the light detector in Figs 7a-d.
  • control of the fluid level is here achieved by a pump 10.
  • Fig. 9 shows an embodiment of the light detector in Fig. 1.
  • the arrangement 2 here comprises a plurality of light absorbing elements 22 extending from the surface of the sensor 4.
  • the elements 22 are arranged in parallel with each other, starting with innermost light absorbing elements 22, and each additional light absorbing element 22 being located axially outwardly (in both directions) along an axis parallel to the light receiving surface 41 of the sensor 4.
  • Each light absorbing element 22 can shift between being absorbing and non- absorbing by varying a voltage across electrodes (not shown) of each light absorbing element 22.
  • the incident light angle range can be adjusted.
  • the incident light angle range i.e. the light path to the sensor 4 can be adjusted.
  • Implementations of light absorbing elements 22 in this embodiment can for instance be based on liquid crystal technology, electro-wetting technology e.g. developed by Liquavista, electrophoretic technology, or electrochromic technology.
  • Fig. 10 shows an embodiment of the light detector in Fig. 1.
  • the light absorbing arrangement 2 here comprises a chamber 23, and first and second electrode layers 12 and 12' respectively. Further, between the electrodes 12 and 12', a plurality of light absorbing particles 24 are suspended in a fluid. The light absorbing particles 24 thus absorb light incident thereon.
  • the chamber 21 is advantageously placed on the sensor 4, or in the light path between the sensor and e.g. a light source.
  • Each light absorbing particle 24 has a high aspect ratio with respect to its dimensions. For instance each light absorbing particle 24 can have dimensions 50*50 micrometer with a thickness of 100 nanometers.
  • the light absorbing particles 24 change orientation when a voltage across the electrode layers 12 and 12' changes. Thereby, the optical path to the sensor 4 can be selectively adjusted and continuously scanned (the incident light angle range is tuned).
  • Figs 1 la-f show an embodiment of the light detector in Fig. 1.
  • the light absorbing arrangements 2 here comprise light absorbing Micro-Electromechanical Systems ⁇ abbreviated MEMS) with electrically switchable surfaces.
  • actuator element 11 can for instance change shape or position when e.g. a voltage is applied.
  • the actuator element 11 utilizes roll blind technology.
  • the rollable actuator element 11 in the form of an electrode can be moveable from a wound up state (a first position) to a rolled out state (a second position) with respect to the sensor 4.
  • the control of the actuator arrangement can be performed electrically by varying the voltage U across the electrodes 12 and 12'.
  • the corresponding actuator element 11 can be independently controlled.
  • Each electrode layer 12' is mounted on a substrate 13 (e.g. a glass substrate) mounted in parallel with a normal of the light receiving surface 41 on opposite sides next to the sensor 4.
  • the substrate 13 extends away from the light receiving surface of the sensor 4.
  • the electrode layer 12' and the substrate 13 are preferably transparent.
  • the actuator element 11 When completely rolled out, the actuator element 11 is parallel to the substrate 13 as shown in Fig. l ie.
  • the substrate 13 supports the actuator element 11.
  • Light is admitted to the sensor 4 between two actuator elements 2.
  • a first circumferential side of the substrate 13 can be substantially in level with the light receiving surface 41 of the sensor 4, wherein a second opposite circumferential side can extend in a direction away from the light receiving surface 41 of the sensor 4.
  • a dielectric layer 14 is located between the electrode layer 12' and the actuator arrangement 11.
  • the actuator arrangement 11 can be controlled to be only partly wound up (or, equivalent Iy, partly rolled out) depending on the voltage U applied between electrode 12' and actuator element 11 as shown in for instance Fig. 1 Ib and Figs 1 ld-f.
  • Each actuator element 11 is can be rolled out in the same direction parallel to the normal to the light receiving surface 41 of the sensor 4.
  • incident light is not blocked by the actuator element 10.
  • the incident light angle range is greater than when the actuator element is rolled out.
  • Fig. 12 shows yet another embodiment of a light absorbing arrangement 2. This embodiment is advantageous separately from previously described embodiments, and is not restricted thereto.
  • the arrangement here comprises a rotatable light absorbing wall 15.
  • the light absorbing wall 15 can be driven electrically to rotate around an axis normal to the light IU
  • the rotatable wall 15 is located in the optical path to the sensor 4.
  • the light absorbing wall has at least one cut-out 16 through which incident light can pass within a predefined range. By rotation of the light absorbing wall 15, the incident light angle range can be controlled.
  • a light detector for detecting light within an incident light angle range comprising: a rotatable light absorbing wall for blocking incident light outside said incident light angle range and for admitting incident light within said incident light angle range, and at least one sensor having a light receiving surface, said sensor being arranged to detect incident light admitted by said rotatable light absorbing wall, wherein said light absorbing wall comprises at least one cut-out, and wherein said wall is rotatable around an axis normal to said light receiving surface 41.
  • additional light absorbing walls 8" can be placed around the sensor 4 in order to block incident light incident from e.g. directions other than those in the plane in which the angle ⁇ varies.
  • a transparent structure of e.g. a plastic material can be placed above the sensor 4 on the light receiving surface 41.
  • the transparent structure preferably has a refraction index which is the same as that of the light absorbing arrangement 2 when no liquid or the (transparent) second liquid phase is present and allows for incident light within a large incident light angle interval. Thereby light incident from sides passing through the light absorbing arrangement towards the sensor 4 will not be refracted. Hence the measurements (regarding incident light angle) of the sensor 4 will be correct.
  • Applications of the present invention include, but are not limited to, indoor environments such as office environments, hotels, and shopping centers, as well as outdoor environments comprising lighting systems. Less efficient methods for measuring incident light from different angles may consequently be replaced by the invention presented herein.

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

Abstract

La présente invention concerne un détecteur de lumière (1), comprenant au moins un agencement absorbant la lumière (2) et un capteur (4). L'agencement absorbant la lumière (2) peut être commandé pour régler une plage d'angle de lumière incidente dans laquelle le capteur (4) peut détecter la lumière. Le détecteur de lumière peut être utilisé dans un système d'éclairage (1) comprenant des luminaires. En particulier, en réglant la plage d'angle de lumière incidente du détecteur de lumière (1), il est possible de déterminer l'angle de lumière incidente sur une surface réceptrice de lumière (41) du capteur (4), et de ce fait d'augmenter la commande de lumière du système d'éclairage.
PCT/IB2010/052389 2009-06-03 2010-05-28 Détecteur de lumière WO2010140095A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09161840.5 2009-06-03
EP09161840 2009-06-03

Publications (2)

Publication Number Publication Date
WO2010140095A2 true WO2010140095A2 (fr) 2010-12-09
WO2010140095A3 WO2010140095A3 (fr) 2011-03-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/052389 WO2010140095A2 (fr) 2009-06-03 2010-05-28 Détecteur de lumière

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2556998R1 (es) * 2014-07-21 2016-02-12 Universidad De Zaragoza Dispositivo para medida de iluminancias en vías públicas y otros espacios
JP6317533B1 (ja) * 2016-12-20 2018-04-25 株式会社芝浦電子 赤外線温度センサ
WO2018116535A1 (fr) * 2016-12-20 2018-06-28 株式会社芝浦電子 Capteur de température à infrarouge

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295232B (de) * 1967-11-16 1969-05-14 Prontor Werk Gauthier Gmbh Lichtleitsystem, welches einem lichtempfindlichen Organ, wie Photowiderstand, Photozelle od. dgl., vorgeschaltet ist
JPS6021425A (ja) * 1983-07-15 1985-02-02 Nippon Denso Co Ltd 光学的検出装置
DE4421383A1 (de) * 1994-06-18 1996-01-04 Geggerle Sigmund Zoomobjektiv-Sonnenblende mit variabler Bildwinkeleinstellung
NL1001199C2 (nl) * 1994-12-14 1996-08-12 Etap Nv Verlichtingsinrichting met lichtgevoelig besturingselement.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2556998R1 (es) * 2014-07-21 2016-02-12 Universidad De Zaragoza Dispositivo para medida de iluminancias en vías públicas y otros espacios
JP6317533B1 (ja) * 2016-12-20 2018-04-25 株式会社芝浦電子 赤外線温度センサ
WO2018116535A1 (fr) * 2016-12-20 2018-06-28 株式会社芝浦電子 Capteur de température à infrarouge
CN109073468A (zh) * 2016-12-20 2018-12-21 株式会社芝浦电子 红外线温度传感器
US10533898B2 (en) 2016-12-20 2020-01-14 Shibaura Electronics Co., Ltd. Infrared temperature sensor
CN109073468B (zh) * 2016-12-20 2020-04-28 株式会社芝浦电子 红外线温度传感器及其制造方法

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