WO2005122875B1 - Device and method for measuring scattering in optical systems - Google Patents

Device and method for measuring scattering in optical systems

Info

Publication number
WO2005122875B1
WO2005122875B1 PCT/ES2005/000338 ES2005000338W WO2005122875B1 WO 2005122875 B1 WO2005122875 B1 WO 2005122875B1 ES 2005000338 W ES2005000338 W ES 2005000338W WO 2005122875 B1 WO2005122875 B1 WO 2005122875B1
Authority
WO
WIPO (PCT)
Prior art keywords
detectors
recording
sheet
polarization
orientation
Prior art date
Application number
PCT/ES2005/000338
Other languages
Spanish (es)
French (fr)
Other versions
WO2005122875A1 (en
Inventor
Garcia Juan Manuel Bueno
Soriano Pablo Artal
Lopez Maria Esther Berrio
Original Assignee
Univ Murcia
Garcia Juan Manuel Bueno
Soriano Pablo Artal
Lopez Maria Esther Berrio
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 Univ Murcia, Garcia Juan Manuel Bueno, Soriano Pablo Artal, Lopez Maria Esther Berrio filed Critical Univ Murcia
Publication of WO2005122875A1 publication Critical patent/WO2005122875A1/en
Publication of WO2005122875B1 publication Critical patent/WO2005122875B1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
    • 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
    • G01J4/00—Measuring polarisation of light
    • G01J4/04—Polarimeters using electric detection means

Abstract

The invention relates to an image polarimeter which is used to determine quantitatively the level of scattering in any optical system, particularly the human eye (4). The instrument uses a double-pass ophthalmoscopic system as a nucleus, said system including a polarisation state-analysis unit (13) comprising a rotary retardation plate (130) and a linear polariser (2, 131). According to the invention, by maintaining the polarisation fixed at the inlet arm, for each of the independent orientations of the fast axis (130a) of the retardation plate (130), the camera or intensity detector (6) records an image of the plane of the retina. Subsequently, said images are used to calculate the Stokes vector of the light that emerges from the eye (4) and, consequently, the degree of polarisation which constitutes a parameter that is directly related to scattering.

Claims

REIVINDICACIONES MODIFICADAS[Recibidas por la Oficina Internacional el 05 de diciembre de 2005 (05.12.2005): reivindicaciones originales 1 - 13, remplazadas por las reivindicaciones modificadas 1 - 11] MODIFIED CLAIMS [Received by the International Bureau on December 05, 2005 (05.12.2005): original claims 1 - 13, replaced by modified claims 1 - 11]
1. Dispositivo para medida de difusión {scatíering) en sistemas ópticos determinando un parámetro, 'grado de polarización', caracterizado porque comprende: primeros medios generadores de polarización (2) para generar luz linealmente polarizada; una unidad analizadora (13) de estados de polarización que comprende: medios generadores para producir 4 estados de polarización independientes; y segundos medios de polarización lineal (131); al menos primeros medios de registro (6) para registrar una señal de entrada para cada uno de los cuatro estados de polarización independientes.1. Device for measuring scattering in optical systems by determining a parameter, 'degree of polarization', characterized in that it comprises: first polarization generating means (2) for generating linearly polarized light; an analyzer unit (13) of polarization states comprising: generating means for producing 4 independent polarization states; and second linear polarization means (131); at least first recording means (6) for recording an input signal for each of the four independent polarization states.
2. El dispositivo de la reivindicación 1, caracterizado porque los medios generadores de polarización comprenden: primeros medios de polarización lineal (2); una lámina (130) rotatoria; y medios de orientación (132) configurados para orientar la lámina (130) rotatoria con un eje rápido (130a) según orientaciones independientes.The device of claim 1, characterized in that the polarization generating means comprise: first linear polarization means (2); a rotating sheet (130); and orientation means (132) configured to orient the rotating plate (130) with a rapid axis (130a) according to independent orientations.
3. El dispositivo de la reivindicación 1, caracterizado porque la unidad analizadora (13) comprende cuatro láminas (130); y los medios de orientación (132) están configurados para orientar cada lámina (130) con un eje rápido (130a) según cada orientación independiente.The device of claim 1, characterized in that the analyzing unit (13) comprises four sheets (130); and the orientation means (132) are configured to orient each sheet (130) with a rapid axis (130a) according to each independent orientation.
4. El dispositivo de cualquiera de las reivindicaciones 2-3, caracterizado porque los medios de registro (6) comprenden detectores (18) seleccionados entre: detectores de imagen para registrar una imagen de doble paso para cada orientación de la lámina (130); detectores de intensidad para registrar una señal de intensidad para cada orientación de la lámina (130); y combinaciones de los mismos.The device of any of claims 2-3, characterized in that the recording means (6) comprise detectors (18) selected from: image detectors for recording a double-pass image for each orientation of the sheet (130); intensity detectors for recording an intensity signal for each orientation of the sheet (130); and combinations thereof.
5. El dispositivo de la reivindicación 4, caracterizado porque además comprende una pluralidad de separadores de haz (19a, 19b, 20) y una pluralidad de polarizadores lineales (131, 21).The device of claim 4, characterized in that it further comprises a plurality of beam splitters (19a, 19b, 20) and a plurality of linear polarizers (131, 21).
6. El dispositivo de la reivindicación 5, caracterizado porque comprende cuatro detectores (18),The device of claim 5, characterized in that it comprises four detectors (18),
HOJAWiODIFlCADA(ARTlCULO IQ) 15HOJAWiODIFlCADA (ARTICLE IQ) fifteen
tres separadores de haz (19a, 19b, 20) y dos polarizadores lineales (131, 21).three beam splitters (19a, 19b, 20) and two linear polarizers (131, 21).
7. El dispositivo de cualquiera de las reivindicaciones 4-6, caracterizado porque los detectores (18) son detectores de intensidad seleccionados entre: fotomultiplicadores, detectores de avalancha, dispositivos capaces de registrar señales de intensidad durante un tiempo determinado y combinaciones de los mismos.The device of any of claims 4-6, characterized in that the detectors (18) are current detectors selected from: photomultipliers, avalanche detectors, devices capable of recording intensity signals during a given time and combinations thereof.
8. El dispositivo de cualquiera de las reivindicaciones 2-7, caracterizado porque además comprende primeros medios de enfoque que comprenden una primera lente (11) fija y una segunda lente (12) móvil para conjugar un plano de interés del sistema óptico a medir con un plano que contiene los medios de registro (6).The device of any of claims 2-7, characterized in that it also comprises first focusing means comprising a first fixed lens (11) and a second mobile lens (12) to conjugate a plane of interest of the optical system to be measured with a plane containing the recording means (6).
9. El dispositivo de cualquiera de las reivindicaciones 2-8, caracterizado porque además comprende segundos medios de enfoque (15) configurados para permitir una corrección de foco variando la distancia del camino óptico entre la primera lente (11) y la segunda lente (12) de forma manual y de forma automática.The device of any of claims 2-8, characterized in that it further comprises second focusing means (15) configured to allow a focus correction by varying the distance of the optical path between the first lens (11) and the second lens (12). ) manually and automatically.
10. El dispositivo de cualquiera de las reivindicaciones 2-9, caracterizado porque las cuatro orientaciones del eje rápido (130a) de la lámina λ/4 (130) están configuradas para generar estados de polarización independientes.The device of any of claims 2-9, characterized in that the four orientations of the fast axis (130a) of the sheet λ / 4 (130) are configured to generate independent polarization states.
11. El dispositivo de cualquiera de las reivindicaciones 2-10, caracterizado porque las orientaciones del eje rápido (130a) de las 4 láminas λ/4 (130) son -45°, 0o, 30° y 60°.The device of any of claims 2-10, characterized in that the orientations of the fast axis (130a) of the 4 sheets λ / 4 (130) are -45 °, 0 or , 30 ° and 60 °.
HOJA MODIFICADA (ARTICUL019) MODIFIED SHEET (ARTICLE 19)
PCT/ES2005/000338 2004-06-15 2005-06-15 Device and method for measuring scattering in optical systems WO2005122875A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200401460A ES2265225B1 (en) 2004-06-15 2004-06-15 DEVICE AND METHOD FOR DIFFUSION MEASUREMENT (SCATTERING) IN OPTICAL SYSTEMS.
ESP200401460 2004-06-15

Publications (2)

Publication Number Publication Date
WO2005122875A1 WO2005122875A1 (en) 2005-12-29
WO2005122875B1 true WO2005122875B1 (en) 2006-02-02

Family

ID=35509391

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES2005/000338 WO2005122875A1 (en) 2004-06-15 2005-06-15 Device and method for measuring scattering in optical systems

Country Status (2)

Country Link
ES (1) ES2265225B1 (en)
WO (1) WO2005122875A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2315171B1 (en) * 2007-05-04 2010-01-08 Universitat Politecnica De Catalunya DEVICE AND METHOD FOR THE MEASUREMENT OF OCULAR DISSEMINATION (SCATTERING) BASED ON THE REGISTRATION AND PROCESSING OF RETINIAN IMAGES.
DE102008027358A1 (en) 2008-06-05 2009-12-10 Carl Zeiss Meditec Ag Ophthalmic laser system and operating procedures
US10182942B2 (en) 2008-06-05 2019-01-22 Carl Zeiss Meditec Ag Ophthalmological laser system and operating method
ES2391192B2 (en) * 2011-04-28 2013-06-18 Universidad De Murcia PROCEDURE AND SYSTEM FOR THE MEASUREMENT OF INTRAOCULAR DISSEMINATION.
ES2441669B2 (en) * 2012-05-04 2015-05-20 Universitat Politècnica De Catalunya METHOD FOR DETECTION OF VISUAL FUNCTION LOSSES
ES2558257A1 (en) 2014-07-31 2016-02-02 Universitat Politècnica De Catalunya Method, system and computer program for measuring the diffusion of light in the globe or ocular region (Machine-translation by Google Translate, not legally binding)
ES2635064B1 (en) * 2016-02-29 2018-08-16 Universidad De Murcia INSTRUMENT FOR OBTAINING IMAGES OF THE EYE AND ASSOCIATED METHOD
DE102016209706A1 (en) * 2016-06-02 2017-12-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device for determining the polarization state by measuring at least three Stokes parameters
CN110448265B (en) * 2018-05-08 2021-07-27 广西师范学院 Birefringent crystal snap Mueller matrix imaging polarization fundus system

Also Published As

Publication number Publication date
WO2005122875A1 (en) 2005-12-29
ES2265225A1 (en) 2007-02-01
ES2265225B1 (en) 2008-01-01

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