Method and apparatus for measuring light reflections of an object
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-021/55
G01N-021/47
출원번호
US-0511686
(2003-04-02)
등록번호
US-7298487
(2007-11-20)
우선권정보
DK-2002 00561(2002-04-15)
국제출원번호
PCT/DK03/000222
(2003-04-02)
§371/§102 date
20041013
(20041013)
국제공개번호
WO03/087792
(2003-10-23)
발명자
/ 주소
Hansen,Jan Harries
Nielsen,Hans Ole
S첩rensen,Kai Ove
Offersgaard,Jesper Falden
출원인 / 주소
Delta Dansk Elektronik, Lys & Akustik
대리인 / 주소
Day Pitney LLP
인용정보
피인용 횟수 :
4인용 특허 :
15
초록▼
A method and apparatus for measuring light reflections of an object, comprising a light-source illumination-observation assembly, the assembly comprising: (A) an illumination unit comprising an illumination light source and illumination aperture stop being arranged to provide a confined luminous fie
A method and apparatus for measuring light reflections of an object, comprising a light-source illumination-observation assembly, the assembly comprising: (A) an illumination unit comprising an illumination light source and illumination aperture stop being arranged to provide a confined luminous field, an illumination field stop (307) adapted to provide an illumination beam (305) of light from said confined luminous field, an collimating optical element (309) adapted to collimate said illumination beam and to provide an illumination field (313) on an object; (B) an observation unit comprising: at least one observation field stop adapted to provide an observation beam (306) comprising a ray boundary, at least one focusing optical element (309) adapted to focus said observation beam, an observation light receiver; and (C) at least one common optical element (309) arranged so that said illumination beam and said observation beam form an overlap therein; and (D) a unit separation stop (310) adapted to stop light from said illumination unit in reaching said observation light receiver of said observation unit; wherein said at least one observation field stops (308, 310, 311) comprises at least one limiting field stop (310) adapted to limit said ray boundary of said observation beam and to maintain said overlap of said illumination beam and said observation beam; a diffuser light-source assembly; and use thereof.
대표청구항▼
The invention claimed is: 1. An apparatus for measuring light reflections of an object, the apparatus comprising: (A) an illumination unit for providing an illumination beam (305), said illumination beam illuminating an illumination field (313) on the object; (B) an observation unit for providing a
The invention claimed is: 1. An apparatus for measuring light reflections of an object, the apparatus comprising: (A) an illumination unit for providing an illumination beam (305), said illumination beam illuminating an illumination field (313) on the object; (B) an observation unit for providing an observation beam (306), said observation beam comprising light received from an observation field on said illuminated object; said observation unit comprising at least a first observation field stop (310) adapted to define a ray boundary of said observation beam (306); the observation unit further comprising an observation light receiver (302, 304) adapted to provide a measuring signal for determining a reflection coefficient from said measuring signal; wherein the apparatus comprises a lens (309) common to the illumination unit and the observation unit; characterized in that said lens is arranged so that said illumination beam and said observation beam form an overlap therein; that the illumination unit and the least first observation field stop are configured to cause the observation field and the illumination field to have different sizes; and that said first observation field stop (310) comprises a wall member extending from the observation light receiver towards said lens; wherein the wall member extends only a part of the distance between the observation light receiver and the lens as to limit said ray boundary of said observation beam while maintaining said overlap of said illumination beam and said observation beam inside the lens. 2. The apparatus according to claim 1, comprising a second observation field stop (308) between the observation light receiver and the lens and displaced along the direction of propagation of said observation beam from the first observation field stop. 3. The apparatus according to claim 1 or 2, wherein said illumination unit comprises: (a) an illumination light source, said illumination light source comprising at least one light source (301) and an illumination aperture stop (303), said at least one light source and said illumination aperture stop being arranged to provide a confined luminous field, (b) an illumination field stop (307), said illumination field stop being adapted to provide the illumination beam (305) of light from said confined luminous field, (c) a collimating optical element (309), said collimating optical element being adapted to collimate said illumination beam and to provide the illumination field (313) on the object; wherein said observation unit comprises: at least one focusing optical element (309), said at least one focusing optical element being adapted to focus said observation beam, wherein the observation light receiver comprises a light receiver (302) and an observation aperture stop (304), said light receiver and said observation aperture stop being arranged to provide a confined receiving field of said focused observation beam; wherein said first observation field stop is adapted to stop light from said illumination unit in reaching said observation light receiver of said observation unit. 4. The apparatus according to claim 1 or 2, wherein said first observation field stop (310) extends substantially half the distance between the observation light receiver and the lens. 5. The apparatus according to claim 1 or 2, wherein said first observation field stop is adapted to stop light reflections. 6. The apparatus according to claim 3, wherein said collimating optical element (309) and said focusing optical element (309) are accommodated in said lens (309). 7. The apparatus according to claim 3, wherein said collimating optical element (409A) has an optical axis which is displaced relative to the optical axis of said observation aperture stop (304). 8. The apparatus according to claim 3, wherein said collimating optical element (409B) is tilted so that its optical axis is non-parallel to the optical axis of the said observation aperture stop (404B). 9. The apparatus according to claim 3, wherein said illumination field stop (307) is fixed to said wall member. 10. The apparatus according to claim 3, further comprising a directional optical element (311) for lateral direction of said collimated illumination beam. 11. The apparatus according to claim 10, wherein said collimating optical element, said focusing element, and said directional optical element are selected from the group consisting of refractive optical elements, reflective optical elements, and diffractive optical elements, or a combination thereof. 12. The apparatus according to claim 11 wherein said refractive optical element is a lens, lens assembly, prism, or a combination thereof. 13. The apparatus according to claim 11 wherein said reflective optical elements is a mirror, preferably a planar mirror or a non-planar mirror, or a combination thereof. 14. The apparatus according to claim 3, the apparatus comprising: a housing accommodating said illumination unit and said observation unit. 15. The apparatus according to claim 14 further comprising a diffuser light-source assembly (614, 615). 16. The apparatus according to claim 14 or 15 further comprising means for determining a retroreflection coefficient and/or a reflection coefficient of the measured light reflections of the object. 17. The apparatus according to claim 15, further comprising means for selecting a light source between said illumination unit and said diffuser light-source assembly. 18. A method of measuring at least one of light retroreflection and light reflection, the method comprising: providing an apparatus for measuring light reflections of an object as defined in claim 1; directing an illumination beam generated by said apparatus toward an observation field of an object; receiving by said apparatus an observation beam from an observation field of said object so as to measure light reflections by the object; and determining at least one of a retroreflection and a reflection coefficient of the measured light reflection of the object. 19. The method according to claim 18, wherein the object is chosen from the group consisting of a reflective material, a reflective device, a retroreflector material and a retroreflector device. 20. The method according to claim 18 wherein the object is chosen from the group consisting of a road marking, a road surface, and a raised pavement marking.
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