JP4046997B2 - Structure of open end of integrating sphere light source - Google Patents

Structure of open end of integrating sphere light source Download PDF

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Publication number
JP4046997B2
JP4046997B2 JP2001378110A JP2001378110A JP4046997B2 JP 4046997 B2 JP4046997 B2 JP 4046997B2 JP 2001378110 A JP2001378110 A JP 2001378110A JP 2001378110 A JP2001378110 A JP 2001378110A JP 4046997 B2 JP4046997 B2 JP 4046997B2
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Japan
Prior art keywords
light source
integrating sphere
open end
image
sphere light
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JP2001378110A
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JP2003177061A (en
Inventor
宏和 吉村
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Japan Science and Technology Agency
National Institute of Japan Science and Technology Agency
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Japan Science and Technology Agency
National Institute of Japan Science and Technology Agency
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Priority to JP2001378110A priority Critical patent/JP4046997B2/en
Priority to PCT/JP2002/010256 priority patent/WO2003050486A1/en
Publication of JP2003177061A publication Critical patent/JP2003177061A/en
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    • 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
    • G01J1/02—Details
    • G01J1/04—Optical or mechanical part supplementary adjustable parts
    • 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
    • G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
    • G01J1/0474—Diffusers
    • 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
    • G01J2001/0481—Preset integrating sphere or cavity

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

Description

【０００１】
【発明の属する技術分野】
本発明は、光源のみの像を撮像する場合の積分球光源の開放端の構造に関するものである。
【０００２】
【従来の技術】
従来、積分球は一様な光源として、スペース・クラフトの設計・テストから、小規模な実験用に至るまで、様々な用途で使われている。また、ＣＣＤカメラがフィルムにとって代わっていくにつれて、今後一様な光源として積分球がＣＣＤカメラと組み合わせて、撮像することが、多くなると考えられる。
【０００３】
本願発明者は、特願２００１−３０５１９３として、積分球光源とＣＣＤカメラの組み合わせを提案した。
【０００４】
このような場合、光源の一様性とその時間変化をテストし、補正するため、フラット・フィールド法を使う。このとき、ＣＣＤカメラで撮像する対象をはずして、光源のみの像を撮像する。
【０００５】
また、ＣＣＤカメラで撮像しない場合も、光源のみの像のデータが必要になる場合がある。このようなとき、現在の積分球の一般的な開放端の構造では、その開放端を通して撮像すると積分球内部の様々な構造を撮像することになって、一様な光源を提供するという積分球の本来の像が得られない。
【０００６】
このため、現在、一般的に使われている方法は、撮像するカメラのレンズのフォーカスを変えて意図的にフォーカスをぼかして撮像するようにしていた。
【０００７】
【発明が解決しようとする課題】
しかしながら、上記した従来の意図的にフォーカスをぼかして撮像する方法では、ＣＣＤカメラと積分球を使って多くの対象を高速で大量に撮像するような場合、カメラのフォーカスを変えることは、高速性を失うばかりでなく、得られた像の一様性にも問題を生じる。また、機器によってはフォーカスを変えることができない場合もある。
【０００８】
本発明は、上記状況に鑑みて、カメラのフォーカスを変えることなく、迅速、的確に光源のみの像を撮像することができる積分球光源の開放端の構造を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明は、上記の目的を達成するために、
〔１〕積分球光源の開放端の構造において、写真乾板又はフィルムである撮像部材の像をカメラで撮像するための照射が空間的に一様な光源としての積分球光源の開放端の構造であって、照射が空間的に一様な光源として光源のみの像を撮影するため、積分球光源の開放端に、前記撮像部材の下に平面光拡散板を有する平面光拡散装置を配置することを特徴とする。
【００１０】
〔２〕上記〔１〕記載の積分球光源の開放端の構造において、前記撮像部材の上に較正用ガラスを配置することを特徴とする。
【００１１】
〔３〕上記〔１〕記載の積分球光源の開放端の構造において、前記平面光拡散板の表面の拡散素子が、撮像系の二次元画像撮像単位素子に対応する細かさを持った、すりガラスであることを特徴とする。
【００１２】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照しながら説明する。
【００１３】
図１は本発明の第１実施例を示す積分球光源装置の模式図である。
【００１４】
この図において、１は基台、２は支柱、３は支持軸、４は積分球光源（内面を拡散反射する白色で塗布した球の内部に光源を有し、開放端の面でのみ、光源の一様性が保障される）、５は積分球光源４の開放端、６はその開放端５に設けられる平面光拡散装置（平面光拡散板）である。
【００１５】
このように、積分球光源４の開放端５に、一様性を保ち、かつ光を通し、また、その光の方向性をできるだけ無くすことができる平面光拡散装置（平面拡散板）６を置き、この平面光拡散装置（平面拡散板）６の平面の像を撮像する。この平面光拡散装置６は目的に応じて、恒久的に開放端５に置くこともできる。
【００１６】
図２は本発明の第２実施例を示す積分球光源装置の模式図、図３はその積分球光源装置の開放端の構造を示す模式図である。
【００１７】
これらの図において、１１は基台、１２は支柱、１３は支持軸、１４は積分球光源、１５は積分球光源１４の開放端、１６はその開放端１５に設けられる平面光拡散装置であり、この平面光拡散装置１６は、下部よりすりガラス（光拡散ガラス）１７、撮像部材である写真乾板又はフイルム１８、その上に較正用ガラス１９を配置する。つまり、撮像部材である写真乾板又はフイルム１８の下にすりガラス（光拡散ガラス）１７を配置するようにしている。２０は撮像装置としてのカメラである。
【００１８】
この実施例では、細かい砂を吹き付けた光拡散ガラス（すりガラス、あるいは、フロスト・ガラス）１７を積分球光源１４の開放端１５に置き、較正用ガラス１９で撮像対象である写真乾板又はフイルム１８を挟むようにした。フラット・フィールド法に使う光源の像としては、この撮像対象を取り除いた、すりガラスの像を使う。このすりガラスを作る場合の砂の大きさは、撮像した場合、ＣＣＤの一素子の大きさ以下でなければならない。
【００１９】
しかし、本発明では、一様性を保ち、かつ光を通し、またその光の方向性をできるだけ無くすことができる平面であればよく、すりガラスに限定するものではない。半透明のセラミックス、プラスティック等、各種の材料を用いることができる。
【００２０】
なお、積分球光源はもともと、開放端の面でのみ、光源の一様性が保障されるように設計されているが、本発明の平面光拡散装置（平面光拡散板）を置くことにより、開放端より少し離れた場所でも、光源の一様性が、平面光拡散装置（光拡散板）がない場合より良く保たれるという利点もある。
【００２１】
また、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づいて種々の変形が可能であり、これらを本発明の範囲から排除するものではない。
【００２２】
【発明の効果】
以上、詳細に説明したように、本発明によれば、以下のような効果を奏することができる。
【００２３】
（Ａ）カメラのフォーカスを変えることなく、迅速、的確に光源のみの像を撮像することができる。
【００２４】
（Ｂ）一様性を保ち、かつ光を通し、またその光の方向性をできるだけなくすことができる平面光拡散装置を設けるようにしたので、光源のみの像を確実に撮像することができる。
【図面の簡単な説明】
【図１】 本発明の第１実施例を示す積分球光源装置の模式図である。
【図２】 本発明の第２実施例を示す積分球光源装置の模式図である。
【図３】 本発明の第２実施例を示す積分球光源装置の開放端の構造を示す模式図である。
【符号の説明】
１，１１ 基台
２，１２ 支柱
３，１３ 支持軸
４，１４ 積分球光源
５，１５ 積分球光源の開放端
６，１６ 平面光拡散装置（平面光拡散板）
１７ すりガラス（光拡散ガラス）
１８ 写真乾板又はフイルム（撮像部材）
１９ 較正用ガラス
２０ カメラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of an open end of an integrating sphere light source when an image of only a light source is picked up.
[0002]
[Prior art]
Traditionally, integrating spheres are used as a uniform light source for a variety of purposes, from space craft design and testing to small-scale experiments. In addition, as the CCD camera is replaced by a film, it is considered that an integrating sphere as a uniform light source will be imaged in combination with the CCD camera in the future.
[0003]
The inventor of the present application has proposed a combination of an integrating sphere light source and a CCD camera as Japanese Patent Application No. 2001-305193.
[0004]
In such a case, the flat field method is used to test and correct the uniformity of the light source and its change over time. At this time, the object to be imaged by the CCD camera is removed and an image of only the light source is captured.
[0005]
Even when the image is not picked up by the CCD camera, image data of only the light source may be required. At this time, in the general open end structure of the present integrating sphere, when the image is taken through the open end, various structures inside the integrating sphere are imaged, and the integrating sphere provides a uniform light source. The original image of cannot be obtained.
[0006]
For this reason, the currently commonly used method is to change the focus of the lens of the camera to be imaged to intentionally blur the image.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional method of intentionally defocusing and imaging, when a large number of objects are imaged at high speed using a CCD camera and an integrating sphere, changing the camera focus is fast. As well as problems with the uniformity of the resulting image. In addition, the focus may not be changed depending on the device.
[0008]
In view of the above situation, an object of the present invention is to provide an open end structure of an integrating sphere light source capable of capturing an image of only the light source quickly and accurately without changing the focus of the camera.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention
[1] An open-ended structure of an integrating sphere light source, which is an open-ended structure of an integrating sphere light source as a light source that is spatially uniform for irradiating an image of an imaging member that is a photographic dry plate or film with a camera. there, since the irradiation to shoot an image of only the light source as a spatially uniform light source, the open end of the integrating sphere light source, placing the planar light diffuser having a flat light diffusion plate below the imaging member It is characterized by.
[0010]
[2] In the structure of the open end of the integrating sphere light source described in [1] above, a calibration glass is disposed on the imaging member.
[0011]
[3] In the structure of the open end of the integrating sphere light source described in [1] above, the diffusing element on the surface of the planar light diffusing plate has a fineness corresponding to the two-dimensional image imaging unit element of the imaging system. It is characterized by being.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0013]
FIG. 1 is a schematic diagram of an integrating sphere light source device showing a first embodiment of the present invention.
[0014]
In this figure, 1 is a base, 2 is a support column, 3 is a support shaft, 4 is an integrating sphere light source (a light source is provided inside a white-coated sphere that diffusely reflects the inner surface, and the light source is only on the open end surface. 5 is an open end of the integrating sphere light source 4, and 6 is a planar light diffusing device (planar light diffusing plate) provided at the open end 5.
[0015]
In this way, a flat light diffusing device (planar diffusing plate) 6 that maintains uniformity and allows light to pass through and eliminates the direction of the light as much as possible is placed at the open end 5 of the integrating sphere light source 4. Then, a planar image of the planar light diffusing device (planar diffusing plate) 6 is taken. The planar light diffusing device 6 can be permanently placed at the open end 5 according to the purpose.
[0016]
FIG. 2 is a schematic diagram of an integrating sphere light source device showing a second embodiment of the present invention, and FIG. 3 is a schematic diagram showing a structure of an open end of the integrating sphere light source device.
[0017]
In these drawings, 11 is a base, 12 is a support, 13 is a support shaft, 14 is an integrating sphere light source, 15 is an open end of the integrating sphere light source 14, and 16 is a planar light diffusing device provided at the open end 15. The flat light diffusing device 16 includes ground glass (light diffusing glass) 17 from the bottom, a photographic dry plate or film 18 as an imaging member, and a calibration glass 19 thereon. That is, the ground glass (light diffusion glass) 17 is disposed under the photographic dry plate or film 18 that is an imaging member. Reference numeral 20 denotes a camera as an imaging device.
[0018]
In this embodiment, a light diffusing glass (ground glass or frosted glass) 17 sprayed with fine sand is placed on the open end 15 of the integrating sphere light source 14, and a photographic plate or film 18 to be imaged is calibrated with a calibration glass 19. I tried to pinch it. As the image of the light source used in the flat field method, a ground glass image from which this imaging target is removed is used. The size of the sand for making this frosted glass must be less than the size of one element of the CCD when imaged.
[0019]
However, in the present invention, any flat surface can be used as long as it is uniform, allows light to pass through, and can eliminate the directionality of the light as much as possible, and is not limited to ground glass. Various materials such as translucent ceramics and plastics can be used.
[0020]
Incidentally, the integrating sphere light source is originally designed to ensure the uniformity of the light source only on the open end surface, but by placing the planar light diffusing device (planar light diffusing plate) of the present invention, There is also an advantage that the uniformity of the light source is better maintained even in a place slightly away from the open end than when there is no planar light diffusing device (light diffusing plate).
[0021]
The present invention is not limited to the above-described embodiments, and various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
[0022]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
[0023]
(A) An image of only the light source can be taken quickly and accurately without changing the focus of the camera.
[0024]
(B) Since the planar light diffusing device capable of maintaining uniformity and transmitting light and eliminating the direction of the light as much as possible is provided, an image of only the light source can be reliably captured.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an integrating sphere light source device showing a first embodiment of the present invention.
FIG. 2 is a schematic diagram of an integrating sphere light source device showing a second embodiment of the present invention.
FIG. 3 is a schematic diagram showing a structure of an open end of an integrating sphere light source device according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,11 Base 2,12 Support | pillar 3,13 Support shaft 4,14 Integrating sphere light source 5,15 Open end of integrating sphere light source 6,16 Planar light diffusion device (planar light diffusion plate)
17 Ground glass (light diffusion glass)
18 Photographic plate or film (imaging member)
19 Calibration glass 20 Camera

Claims (3)

写真乾板又はフィルムである撮像部材の像をカメラで撮像するための照射が空間的に一様な光源としての積分球光源の開放端の構造であって、照射が空間的に一様な光源として光源のみの像を撮影するため、積分球光源の開放端に、前記撮像部材の下に平面光拡散板を有する平面光拡散装置を配置することを特徴とする積分球光源の開放端の構造。 The structure of the open end of an integrating sphere light source as a spatially uniform light source for imaging an image of an imaging member that is a photographic plate or film with a camera, and the illumination as a spatially uniform light source A structure of an open end of an integrating sphere light source, wherein a flat light diffusing device having a flat light diffusing plate is disposed under the imaging member at the open end of the integrating sphere light source in order to capture an image of only the light source. 請求項１記載の積分球光源の開放端の構造において、前記撮像部材の上に較正用ガラスを配置することを特徴とする積分球光源の開放端の構造。2. The open end structure of an integrating sphere light source according to claim 1, wherein a glass for calibration is disposed on the imaging member. 請求項１記載の積分球光源の開放端の構造において、前記平面光拡散板の表面の拡散素子が、撮像系の二次元画像撮像単位素子に対応する細かさを持った、すりガラスであることを特徴とする積分球光源の開放端の構造。  The structure of the open end of the integrating sphere light source according to claim 1, wherein the diffusing element on the surface of the planar light diffusing plate is a ground glass having a fineness corresponding to a two-dimensional imaging unit element of an imaging system. The open end structure of the integrating sphere light source.
JP2001378110A 2001-12-12 2001-12-12 Structure of open end of integrating sphere light source Expired - Fee Related JP4046997B2 (en)

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PCT/JP2002/010256 WO2003050486A1 (en) 2001-12-12 2002-10-02 Structure of open end of integrating sphere light source

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WO2006030597A1 (en) * 2004-09-17 2006-03-23 Japan Science And Technology Agency Object digitizing device using integrating sphere wave source
KR101090594B1 (en) 2009-09-14 2011-12-06 최혁재 The equipment and method of securing a light source uniformity to test picture quality of image sensor,without changing of Color Temperature according to change illuminance,materializing various Color Temperature by using single light source,and testing camera picture quality by using this.
KR100996881B1 (en) * 2010-01-06 2010-11-26 유병소 Integrating sphere

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