JP4911606B2 - 全反射減衰型光学プローブおよびそれを用いた水溶液分光測定装置 - Google Patents
全反射減衰型光学プローブおよびそれを用いた水溶液分光測定装置 Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
-
- 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/443—Emission spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/10—Scanning
- G01N2201/105—Purely optical scan
- G01N2201/1056—Prism scan, diasporameter
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Description
近赤外域に現れる水の吸収スペクトルは本来禁制遷移で吸収が弱く、ごく微量の溶解成分の濃度が測定できない。そこで、発明者は、遠紫外スペクトルに着目して研究したところ、純粋な水は遠紫外域の150nm付近に非常に大きなシャープな吸収ピークを有し、そのシャープな吸収の裾部分の変化を測定することにより、水溶液中に水和する極微量の溶解成分の濃度が測定できることを見出した。つまり、水自身は150nm付近の吸収ピークから200nm付近の吸収ボトムまでに非常に急峻な吸収スペクトルの減少を示し、かつ、この吸収バンドのピーク位置やバンド幅がごく微量の溶質成分の水和によっても変化する。そのため、その吸収ピークのわずかな波長シフトは、そのシャープな吸収の傾斜部分では非常に高感度に捉えられ、水溶液中のごく微量成分の濃度測定に利用できる。これについては特開2005−214863号公報に記載されている。すなわち、水の吸収ピークの裾部分のスペクトルを測定し、複数波長での吸光度の多変量解析により検量線を作成することにより、ごく微量の溶解成分を測定できた。たとえば、特開2005−214863号公報の図1は、0〜20ppmの範囲内の11の濃度(1、2、3、4、5、6、8、10、12、16、20ppm)のHCl水溶液の遠紫外スペクトルを示し、特開2005−214863号公報の図2は、HClの濃度を予測する検量線モデルの相関性を示す。モデルの相関係数Rと標準偏差σは、0.9987と0.18ppmであった。少なくとも100ppmまで微量のHClが高精度で定量測定できることが分かった。本測定例での水溶液中のHClの検出限界は0.5ppmであった。
(1)光学プローブの材質の屈折率がサンプル物質の屈折率よりも大きいこと(全反射条件)。
(2)光学プローブの材質が測定波長領域で透明である(光透過率が十分に高い)こと(透過条件)。
しかし、水の屈折率は遠紫外域では波長が短くなるにつれて著しく増加するため(図4参照)、全反射減衰光学プローブとしての2つの条件を満たす材料がない。つまり、石英やサファイアのように屈折率が遠紫外域でも水より高い材質は160nm付近では十分な透過率を有さず、一方、その波長領域の遠紫外線を透過する材質(たとえばフッ化マグネシウム、フッ化カルシウムなど)はすべて遠紫外域で屈折率が水の屈折率よりも低くなり、全反射条件を満足できなくなる。このため、測定波長領域を200nmまたはせいぜい190nm以上に限定する光学プローブしか実用化されていない。すなわち、水の150nm付近のピーク波長まで測定できる光学プローブを用いた全反射減衰吸光法の例は、背景技術で説明した従来の全反射減衰光学プローブを含め、報告されていなかった。
Claims (6)
- 遠紫外域で光透過特性を有する光学材料からなり、サンプルと接する接触面と、サンプルと接触しない入射面および出射面とを備えるプリズムと、
前記プリズムを構成する前記光学材料と同一の光学材料からなり、開口部を備える支持部材であって、前記開口部の近傍で前記プリズムの接触面とオプティカルコンタクトによって気密に接合された支持部材と、
を備え、
前記プリズムにおける前記接触面、前記入射面および前記出射面は、前記入射面を透過した光が臨界角より大きい入射角で前記接触面に入射し、サンプルと接する前記接触面で全反射する光が前記出射面を出ていくように配置される、遠紫外域で全反射減衰を測定するための全反射減衰型光学プローブ。 - 前記プリズムにおける前記入射面から前記接触面を経て前記出射面までの光路長は、前記入射面に垂直に入射した160nmの波長の光が10%以上の内部透過率を有する長さであることを特徴とする、請求項1に記載された、全反射減衰型光学プローブ。
- 前記光学材料が、合成石英、水晶およびサファイアのいずれかからなることを特徴とする請求項1又は2に記載の全反射減衰型光学プローブ。
- 前記プリズムの光学材料が合成石英であり、前記支持部材も合成石英からなることを特徴とする請求項1又は2に記載の全反射減衰型光学プローブ。
- 前記プリズムの光学材料がサファイアであり、前記支持部材もサファイアからなることを特徴とする請求項1又は2に記載の全反射減衰型光学プローブ。
- サンプル物質に接して配置される請求項1から5のいずれか一項に記載の全反射減衰型光学プローブと、
前記全反射減衰型光学プローブに遠紫外光を照射する光源と、
前記全反射減衰型光学プローブからの全反射光を検出する受光素子と、
前記光源から前記受光素子までの光路において遠紫外光を分光する分光素子と、
を備えた水溶液分光測定装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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JP2007058895A JP4911606B2 (ja) | 2007-03-08 | 2007-03-08 | 全反射減衰型光学プローブおよびそれを用いた水溶液分光測定装置 |
TW97104991A TWI461683B (zh) | 2007-03-08 | 2008-02-13 | 衰減式全反射探針及具該探針之光譜儀 |
EP20080003616 EP1970695A1 (en) | 2007-03-08 | 2008-02-28 | Attenuated total reflection probe and spectrometer therewith |
KR1020080020403A KR101477803B1 (ko) | 2007-03-08 | 2008-03-05 | 감쇠 전반사 프로브 및 이를 구비한 분광계 |
US12/073,532 US7791729B2 (en) | 2007-03-08 | 2008-03-06 | Attenuated total reflection probe and spectrometer therewith |
CNA2008100853140A CN101261216A (zh) | 2007-03-08 | 2008-03-07 | 衰减全反射探头及设有该探头的分光计 |
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JP2007058895A JP4911606B2 (ja) | 2007-03-08 | 2007-03-08 | 全反射減衰型光学プローブおよびそれを用いた水溶液分光測定装置 |
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JP2008224240A JP2008224240A (ja) | 2008-09-25 |
JP2008224240A5 JP2008224240A5 (ja) | 2010-12-24 |
JP4911606B2 true JP4911606B2 (ja) | 2012-04-04 |
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US (1) | US7791729B2 (ja) |
EP (1) | EP1970695A1 (ja) |
JP (1) | JP4911606B2 (ja) |
KR (1) | KR101477803B1 (ja) |
CN (1) | CN101261216A (ja) |
TW (1) | TWI461683B (ja) |
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TW200944776A (en) * | 2008-03-04 | 2009-11-01 | Kurashiki Boseki Kk | Total reflection attenuation type far-ultraviolet spectroscopy and concentration measurement device using the spectroscopy |
CA2758113A1 (en) | 2009-04-07 | 2010-10-14 | Rare Light, Inc. | Peri-critical reflection spectroscopy devices, systems, and methods |
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JP5384648B2 (ja) * | 2009-08-21 | 2014-01-08 | 株式会社村田製作所 | 被測定物の特性を測定する方法 |
JP5468344B2 (ja) * | 2009-09-30 | 2014-04-09 | 倉敷紡績株式会社 | 水溶液中の水溶性ラジカル種濃度の測定方法、及び、水溶性ラジカル種濃度測定装置 |
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CN102374974B (zh) * | 2010-08-25 | 2013-03-27 | 中国科学院电子学研究所 | 基于集成光波导的衰减全反射光谱测量式傅里叶光谱仪 |
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WO2016168090A1 (en) | 2015-04-14 | 2016-10-20 | Nueon, Inc. | Method and apparatus for determining markers of health by analysis of blood |
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JP4315771B2 (ja) * | 2003-09-30 | 2009-08-19 | 大日本印刷株式会社 | 有機材料インキの選定方法 |
JP4372567B2 (ja) * | 2004-01-30 | 2009-11-25 | 倉敷紡績株式会社 | 紫外光による水および水溶液測定方法 |
JP2005233884A (ja) * | 2004-02-23 | 2005-09-02 | System Instruments Kk | エバネッセント波を用いた粉末若しくは粉末を固めた試料片の紫外可視吸収スペクトル測定装置 |
WO2006109408A1 (ja) * | 2005-04-11 | 2006-10-19 | Kurashiki Boseki Kabushiki Kaisha | 全反射減衰型光学プローブおよびそれを用いた遠紫外分光測定装置 |
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US7791729B2 (en) | 2010-09-07 |
JP2008224240A (ja) | 2008-09-25 |
US20080218734A1 (en) | 2008-09-11 |
TWI461683B (zh) | 2014-11-21 |
CN101261216A (zh) | 2008-09-10 |
KR101477803B1 (ko) | 2014-12-30 |
KR20080082479A (ko) | 2008-09-11 |
EP1970695A1 (en) | 2008-09-17 |
TW200842338A (en) | 2008-11-01 |
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