JP2004138387A - Photocatalyst function evaluating apparatus and photocatalyst function evaluation method using the same - Google Patents

Photocatalyst function evaluating apparatus and photocatalyst function evaluation method using the same Download PDF

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JP2004138387A
JP2004138387A JP2002300519A JP2002300519A JP2004138387A JP 2004138387 A JP2004138387 A JP 2004138387A JP 2002300519 A JP2002300519 A JP 2002300519A JP 2002300519 A JP2002300519 A JP 2002300519A JP 2004138387 A JP2004138387 A JP 2004138387A
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light
sample
photocatalytic function
detection unit
evaluation
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Japanese (ja)
Inventor
Yoichi Takasaki
高崎　洋一
Hiroshi Sagara
相良　宏
Junichi Ishikawa
石川　淳一
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Ulvac Riko Inc
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Ulvac Riko Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a photocatalyst function evaluating apparatus and a photocatalyst function evaluation method that can cope with both ultraviolet rays and visible rays and can measure the activity of photocatalysts with a sufficient sensitivity. <P>SOLUTION: The photocatalyst function evaluating apparatus comprises an activation light source L for causing photocatalysts; and a plurality of quantity-of-light detection sections S having light-emitting elements 6, 11 for irradiating a specific sample with measuring light and light receiving elements 7, 12 for receiving light that arrive via the sample. The activation light source L has a black light lamp 3 and a fluorescent lamp 4. The quantity-of-light detection sections S comprises a detection section 20 for reference samples for a sample that becomes a reference when evaluating photocatalyst functions; and a detection section 21 for evaluating samples for the sample whose photocatalyst functions are evaluated. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、光触媒機能の評価装置及び評価方法に関し、特に、紫外光及び可視光の両方で光触媒の活性度を評価する光触媒機能評価装置及びこれを用いた光触媒の評価方法に関する。
【０００２】
【従来の技術】
近年、アナターゼ型の酸化チタンの結晶が付着された水を紫外光の照射によって分解し、その時に発生する活性酸素が抗菌作用や有機物質を分解する防汚性をもつことが見い出され、「光触媒機能」として知られるようになった。
【０００３】
そして、この技術を応用した製品、たとえば抗菌性便器、エアコン用抗菌フィルターなどが開発、市販されるようになった。
【０００４】
ところで、紫外光は、太陽光では全体の３％、１ｃｍ２当り１ｍＷ程度、室内灯では、１ｃｍ２当り１μＷ程度とわずかしか含まれていないため、従来は、太陽光の大部分を占める可視光領域の光で光触媒機能を発揮できるような可視光応答型光触媒の研究が盛んに行われている。
【０００５】
その一方、近年、光触媒機能を有する材料の表面に、有機染料の水溶液を塗布、乾燥させた後、紫外線を照射して光触媒機能による吸光度の減少を測定し、この減少速度などを測定することによって光触媒の活性度を評価するものが知られている（例えば、下記特許文献１、２参照）。
【０００６】
【特許文献１】
特開２０００−１６２１２９号公報
【０００７】
【特許文献２】
特開２０００−１６２２０２号公報
【０００８】
【発明が解決しようとする課題】
上述したように、従来技術は、可視光か紫外光かのいずれかに反応する光触媒の活性度を測定するものであるが、近年、紫外光と可視光の両方に反応する光触媒の活性度を高感度で測定して評価する装置が望まれている。
【０００９】
また、上記の従来技術では、発光素子と受光素子とで光触媒機能の弱い試験片を測定する場合に、受光素子から得られる出力変化が非常にわずかな場合があり、これがゆえに測定感度が十分でないという問題があった。
【００１０】
本発明は、このような従来の技術の課題を解決するためになされたもので、紫外光と可視光とのいずれにも対応可能な光触媒機能評価装置及び評価方法を提供することを目的とする。
【００１１】
また、本発明は、光触媒の活性度を十分な感度で測定する光触媒機能評価装置及び評価方法を提供することを目的とする。
【００１２】
【課題を解決するための手段】
上記目的を達成するためになされた請求項１記載の発明は、光触媒を起こさせるための活性化光源と、測定光を所定の試料に照射するための発光素子と、当該試料を介して到達した光を受光する受光素子とを有する光量検出部とを備え、前記受光素子にて得られた結果に基づいて光触媒機能を評価する光触媒機能評価装置であって、前記活性化光源は波長の異なる複数のランプを有し、前記光量検出部は、光触媒機能を評価する際の基準となる試料のための基準試料用検出部と、光触媒機能が評価される試料のための評価試料用検出部とを備え、前記基準試料用検出部と評価試料用検出部の前記複数のランプに対する光学的配置が同一であることを特徴とする。
請求項２記載の発明は、請求項１記載の発明において、前記活性化光源が、紫外線領域の光を照射するためのランプと、可視光領域の光を照射するためのランプとを有することを特徴とする。
請求項３記載の発明は、請求項１又は２のいずれか１項記載の発明において、前記基準試料用検出部と評価試料用検出部との間に所定の高さの仕切り部が設けられていることを特徴とする。
請求項４記載の発明は、請求項１乃至３のいずれか１項記載の光触媒機能の評価装置を用いて光触媒機能を評価する光触媒機能の評価方法であって、前記活性化光源から光触媒機能を起こさせる光を前記基準試料と前記評価試料とに照射しつつ、前記基準試料と前記評価試料に対して前記基準試料用検出部及び前記評価試料用検出部の発光素子から光触媒機能を評価するための光を照射し、前記基準試料と前記評価試料を介して到達した光を前記基準試料用検出部及び前記評価試料用検出部の受光素子によってそれぞれ受光し、当該各受光素子で受光した光の光量を比較し、当該比較の結果に基づいて光触媒機能を評価することを特徴とする。
【００１３】
本発明にあっては、基準試料に照射して得られた光と評価試料に照射して得られた光の光量を比較し比較の結果に基づいて光触媒機能を評価するようにしたので、受光素子や、受光素子の検出結果を処理する増幅回路等で発生する変動が相殺され光触媒の活性力による出力変化だけが高感度で検出されるようになり、正確に光触媒機能を評価することが可能になる。
【００１４】
特に、本発明の光触媒評価装置においては、基準試料用検出部と評価試料用検出部の波長の異なる複数のランプに対する光学的配置が同一であるので、例えば紫外光及び可視光を用いて光触媒機能を評価する際に基準試料及び評価試料における条件を同一にすることができ、これにより広範囲の光に対して正確に光触媒機能を評価することが可能になる。
【００１５】
また、本発明において、基準試料用検出部と評価試料用検出部との間に仕切り部を設けるようにすれば、基準試料用検出部で検出される光と評価試料用検出部で検出される光とが互いに影響し合うことがなくなるので、基準試料用検出部及び評価試料用検出部で検出される光量がより正確になる。
【００１６】
【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て説明する。
【００１７】
図１は、本発明の第１の実施の形態の光触媒機能評価装置の概略構成を示す平面図、図２は、同光触媒機能評価装置に試料が設置された状態を示す平面図である。
図３は、同光触媒機能評価装置の概略構成を示す側面図、図４は、同光触媒機能の評価装置の試料周辺の拡大図である。
【００１８】
図５は、同光触媒機能評価装置の蛍光ランプが発光する光の波長と発光強度との関係を示すグラフ、図６は、同光触媒機能評価装置において蛍光ランプに装着される紫外線カットフィルターの特性を示すグラフである。
【００１９】
図１及び図３に示すように、本実施の形態の光触媒機能の評価装置１は、基台２の上に設けられた細長箱型形状のケース１０を有し、このケース１０の中に各構成部材が収容されている。
【００２０】
なお、このケース１０内の一方の端部には、外気を導入してケース１０内を冷却するためのファン８が設けられている。
【００２１】
本実施の形態の光触媒機能の評価装置１は、光触媒を起こさせるための活性化光源Ｌとして、ブラックライトランプ３と蛍光ランプ４とを備えている。
【００２２】
ブラックライトランプ３と蛍光ランプ４は細長形状に形成され、ケース１０内の中央上部においてケース１０の長手方向に沿って平行に隣接配置されている。
【００２３】
そして、ブラックライトランプ３と蛍光ランプ４の上方を取り囲むように、凹面状の反射鏡５が設けられている。
【００２４】
ブラックライトランプ３と蛍光ランプ４は、後述する基準試料３０及び評価試料３１に対して等距離の位置に配置されている。
【００２５】
ブラックライトランプ３と蛍光ランプ４は、それぞれ発光する光の波長が異なるものである。
【００２６】
本実施の形態の場合、ブラックライトランプ３は、３４０ｎｍ〜４００ｎｍ程度の波長の光を発光する。
【００２７】
一方、蛍光ランプ４は、３００ｎｍ〜７５０ｎｍ程度の波長の光を発光するが（図５参照）、蛍光ランプ４から発光される光は紫外線領域の光も含まれるので、本実施の形態では、蛍光ランプ４の外周に紫外線カットフィルター４ａを装着し、これにより蛍光ランプ４は、紫外光を除く波長４００ｎｍ〜７５０ｎｍの光を発光するようになっている（図６参照）。
【００２８】
なお、ブラックライトランプ３と蛍光ランプ４との切換は図示しない切換器によって行われる。
【００２９】
本実施の形態の光触媒機能の評価装置１は、光触媒機能を評価するための光量検出部Ｓとして、光触媒機能が評価される際の基準となる基準試料３０についての光量を検出するための基準試料用検出部２０と、評価対象である評価試料３１についての光量を検出するための評価試料用検出部２１とを備えている。
【００３０】
ここで、基準試料用検出部２０は、対となる発光素子６と受光素子１１を備えており、また、評価試料用検出部２１は、対となる発光素子７と受光素子１２を備えている。
【００３１】
発光素子６、７は、例えば発光ダイオードを用い、一定周期のパルス光（照射光２６、２７）を発するように構成されている。
【００３２】
本実施の形態の場合、基準試料用検出部２０の発光素子６及び受光素子１１は、ブラックライトランプ３と蛍光ランプ４を挟んで同じ高さで対称となる位置に配置されている。
【００３３】
さらに、測定試料用検出部２２の発光素子７及び受光素子１２も、ブラックライトランプ３と蛍光ランプ４を挟んで同じ高さで対称となる位置に配置されている。
【００３４】
そして、基準試料用検出部２０の発光素子６及び受光素子１１と、測定試料用検出部２２の発光素子７及び受光素子１２は、ブラックライトランプ３と蛍光ランプ４のそれぞれに対して同一の光学的配置となるように構成されている。
【００３５】
図２に示すように、本実施の形態の場合、基準試料３０は、基準試料用検出部２０の発光素子６及び受光素子１１の間で、ブラックライトランプ３と蛍光ランプ４の直下に配置されるようになっている。
【００３６】
この基準試料３０としては、光触媒機能を有しない試料、例えば基材上に後述する評価試料３１の着色層３１ｃと同一の着色層が形成されたものを用いる。
【００３７】
一方、測定試料３１は、測定試料用検出部２２の発光素子７及び受光素子１２の間で、ブラックライトランプ３と蛍光ランプ４の直下に配置されるようになっている。
【００３８】
図３に示すように、これら基準試料３０又は評価試料３１は、基台２上に配置された反射紙４０又は４１の上に載置される。
【００３９】
図４に示すように、評価試料３１は、透明な基材３１ａ上に光触媒機能を有する光触媒機能膜３１ｂが形成され、この光触媒機能膜３１ｂ上に、光触媒機能膜３１ｂの光触媒作用によって光の透過率が変化する着色層３１ｃが形成されている。
【００４０】
また、図３に示すように、基準試料用検出部２０の受光素子６は検出回路９に接続され、また評価試料用検出部２１の受光素子１２は検出回路１３に接続されている。
【００４１】
これら検出回路９及び１３は、受光素子６及び１２で受光した反射光２７及び２８の光量に応じた電気信号を出力するように構成されている。
【００４２】
図７は、本実施の形態の光触媒機能評価装置の制御系の主要部を示すブロック図である。
図７に示すように、本実施の形態のブラックライトランプ３、蛍光ランプ４、発光素子６、発光素子１２、検出回路９及び検出回路１３は、それぞれ図示しないコンピュータの制御部１４に接続されている。
【００４３】
制御部１４は、検出回路９又は１３において検出された受光量を測定し、この測定された受光量データの差分を取る演算を行い、所定のアルゴリズムに基づいて評価試料３１の光触媒機能を評価する機能を有している。
【００４４】
このような構成を有する本実施の形態において光触媒機能を評価するには、まず、基準試料３０及び評価試料３１を上記所定の位置に配置し、ブラックライトランプ３又は蛍光ランプ４を発光させ、基準試料３０及び評価試料３１に対してブラックライトランプ３及び蛍光ランプ４の光を照射する。
【００４５】
これにより、評価試料３１は、光の照射によって光触媒機能膜３０ｂが活性化され、時間の経過に伴って着色層３１ｃの光透過率が変化して反射光の強度が変化する。
【００４６】
一方、基準試料３０は、ブラックライトランプ３又は蛍光ランプ４によって光が照射されても着色層の光透過率は変化しない。
【００４７】
この状態で、基準試料用検出部２０の発光素子６と評価試料用検出部２１の発光素子１２からそれぞれ基準試料３０及び評価試料３１に対して照射光２５及び２６を照射し、基準試料３０及び評価試料３１によって反射された反射光２７及び２８を、基準試料用検出部２０及び評価試料用検出部２１の受光素子７及び１１で受光する。
【００４８】
受光した反射光２７及び２８は、検出回路９及び１３で受光量に応じた電気信号に変換され制御部１４に出力される。
【００４９】
制御部１４では、この出力された電気信号から受光素子７及び１１における受光量を測定し、それぞれ測定されたデータの差分をとる演算を行い（示差法）、これに基づいて吸光度の変化（減少速度等）を測定して評価試料３１の光触媒機能を評価する。
【００５０】
以上述べたように、本実施の形態によれば、基準試料３０に照射して得られた光と評価試料３１に照射して得られた光の光量を比較し比較の結果に基づいて光触媒機能を評価するようにしたので、受光素子６、１１や、受光素子６、１１の検出結果を処理する増幅回路等で発生する変動が相殺され光触媒の活性力による出力変化だけが高感度で検出されるようになり、正確に光触媒機能を評価することができる。
【００５１】
特に、本実施の形態においては、基準試料用検出部２０と評価試料用検出部２１のブラックライトランプ３及び蛍光ランプ４に対する光学的配置が同一であるので、紫外光及び可視光を用いて光触媒機能を評価する際に基準試料３０及び評価試料３１における条件を同一にすることができ、これにより広範囲の光に対して正確に光触媒機能を評価することができる。
【００５２】
以下、本発明の第２の実施の形態について説明する。
図８は、本実施の形態の光触媒機能評価装置の概略構成を示す平面図、図９は、同光触媒機能評価装置の概略構成を示す断面図であり、以下、上記実施の形態と対応する部分には同一の符号を付してその詳細な説明を省略する。
【００５３】
図８及び図９に示すように、本実施の形態の光触媒機能の評価装置１Ａは、基準試料用検出部２０と評価試料用検出部２１との間に矩形平板状の仕切り板（仕切り部）３３が配設されている。
【００５４】
図９に示すように、この仕切り板３３は、その上端部が、各発光素子６、７の発光部分及び各受光素子１１、１２の受光部分より高く、かつ、ブラックライトランプ３及び蛍光ランプ４との間に所定の隙間ができる高さを有している。
【００５５】
本発明の場合、仕切り板３３の上端部とブラックライトランプ３及び蛍光ランプ４との間の隙間の大きさについては特に限定されることはないが、導入した大気を円滑に循環させるためには、９ｍｍ〜１５ｍｍとすることが好ましい。
【００５６】
また、仕切り板３３の幅については、基準試料用検出部２０及び評価試料用検出部２１相互間の光の影響を防止する観点から、各発光素子６、７の発光部分及び各受光素子１１、１２の受光部分の間隔より若干大きくなるように設定することが好ましい。
【００５７】
このような構成を有する本実施の形態によれば、基準試料用検出部２０と評価試料用検出部２１との間に仕切り板３３を設けたことにより、基準試料用検出部２０で検出される光と評価試料用検出部２１で検出される光とが互いに影響し合うことがなくなるので、基準試料用検出部２０及び評価試料用検出部２１で検出される光量がより正確になる。その他の構成及び作用効果については上述の実施の形態と同一であるのでその詳細な説明を省略する。
【００５８】
なお、本発明は上述の実施の形態に限られることなく、種々の変更を行うことができる。
例えば、上記実施の形態においては、基準試料用検出部と評価試料用検出部の発光素子を活性化光源に対して同じ側に配置するようにしたが、光学的配置が同一である限り、各発光素子を活性化光源を挟んで反対側に配置するようにすることも可能である。
【００５９】
また、上記実施の形態においては、評価試料用検出部と基準試料用検出部を一つずつ設けるようにしたが、一つの基準試料用検出部に対して二つ以上の評価試料用検出部を設けることも可能である。
【００６０】
さらに、活性化光源のランプの数も上述の実施の形態の数に限られず、波長の異なるランプを三つ以上設けることも可能である。
【００６１】
さらにまた、仕切り部の大きさ、形状等も、上述の実施の形態ものには限られない。例えば、仕切り部をケースの内部をほぼ仕切るように大きさ及び形状に形成し、この仕切り部をケース内の大気を循環させるための微細な孔を設けるようにしてもよい。また、同様の大きさ及び形状の仕切り部にメッシュを設ける構成にしてもよい。
【００６２】
加えて、上記実施の形態においては、基準試料及び評価試料に光を照射しその反射光を受光して測定を行うようにしたが、基準試料及び評価試料に光を照射しその透過光を受光して測定を行うようにすることも可能である。
【００６３】
【発明の効果】
以上述べたように、本発明によれば、基準試料に照射して得られた光と評価試料に照射して得られた光の光量を比較し比較の結果に基づいて光触媒機能を評価するようにしたので、受光素子や、受光素子の検出結果を処理する増幅回路等で発生する変動が相殺され光触媒の活性力による出力変化だけが高感度で検出されるようになり、正確に光触媒機能を評価することができる。
【００６４】
特に、本発明の光触媒評価装置においては、基準試料用検出部と評価試料用検出部の波長の異なる複数のランプに対する光学的配置が同一であるので、例えば紫外光及び可視光を用いて光触媒機能を評価する際に基準試料及び評価試料における条件を同一にすることができ、これにより広範囲の光に対して正確に光触媒機能を評価することができる。
【００６５】
また、本発明の光触媒評価装置において、基準試料用検出部と評価試料用検出部との間に仕切り部を設けるようにすれば、基準試料用検出部で検出される光と評価試料用検出部で検出される光とが互いに影響し合うことがなくなるので、基準試料用検出部及び評価試料用検出部においてより正確な光量の検出を行うことができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の光触媒機能評価装置の概略構成を示す平面図である。
【図２】同光触媒機能評価装置の試料が設置された状態を示す平面図である。
【図３】同光触媒機能評価装置の概略構成を示す側面図である。
【図４】同光触媒機能の評価装置の試料周辺の拡大図である。
【図５】同光触媒機能評価装置の蛍光ランプが発光する光の波長と発光強度との関係を示すグラフである。
【図６】同光触媒機能評価装置において蛍光ランプに装着される紫外線カットフィルターの特性を示すグラフである。
【図７】同光触媒機能評価装置の制御系の主要部を示すブロック図である。
【図８】本発明の第２の実施の形態の光触媒機能評価装置の概略構成を示す平面図である。
【図９】同光触媒機能の評価装置の概略構成を示す断面図である。
【符号の説明】
１　光触媒機能評価装置
３　ブラックライトランプ
４　蛍光ランプ
６　発光素子
７　受光素子
１１　発光素子
１２　受光素子
２０　基準試料用検出部
２１　評価試料用検出部
３０　基準試料
３１　評価試料
３３　　仕切り板（仕切り部）
Ｌ　活性化光源
Ｓ　光量検出部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an evaluation device and an evaluation method for a photocatalytic function, and more particularly to a photocatalytic function evaluation device for evaluating the activity of a photocatalyst using both ultraviolet light and visible light, and a photocatalyst evaluation method using the same.
[0002]
[Prior art]
In recent years, it has been discovered that water to which anatase-type titanium oxide crystals are attached is decomposed by irradiation with ultraviolet light, and the active oxygen generated at that time has antibacterial action and antifouling properties to decompose organic substances. Function ".
[0003]
Products using this technology, such as antibacterial toilet bowls and antibacterial filters for air conditioners, have been developed and marketed.
[0004]
By the way, since ultraviolet light contains only 3% of the total amount of sunlight and about 1 mW per 1 cm 2 , and room light contains only about 1 μW per 1 cm 2 , conventionally, visible light occupies most of the sunlight. 2. Description of the Related Art Visible light responsive photocatalysts capable of exerting a photocatalytic function with light in a region have been actively studied.
[0005]
On the other hand, in recent years, an aqueous solution of an organic dye is applied to the surface of a material having a photocatalytic function, dried, and then irradiated with ultraviolet light to measure a decrease in absorbance due to the photocatalytic function, and the rate of decrease is measured. A device for evaluating the activity of a photocatalyst is known (for example, see Patent Documents 1 and 2 below).
[0006]
[Patent Document 1]
JP 2000-162129 A
[Patent Document 2]
JP 2000-162202 A
[Problems to be solved by the invention]
As described above, the prior art measures the activity of a photocatalyst that reacts to either visible light or ultraviolet light.In recent years, the activity of a photocatalyst that reacts to both ultraviolet light and visible light has been measured. There is a need for an apparatus that measures and evaluates with high sensitivity.
[0009]
Further, in the above-described conventional technology, when a test piece having a weak photocatalytic function is measured with a light emitting element and a light receiving element, the output change obtained from the light receiving element may be very small, and therefore the measurement sensitivity is not sufficient. There was a problem.
[0010]
The present invention has been made in order to solve such problems of the related art, and an object of the present invention is to provide a photocatalytic function evaluation apparatus and an evaluation method that can respond to both ultraviolet light and visible light. .
[0011]
Another object of the present invention is to provide a photocatalyst function evaluation device and an evaluation method for measuring the activity of a photocatalyst with sufficient sensitivity.
[0012]
[Means for Solving the Problems]
The invention according to claim 1, which has been made to achieve the above object, has an activation light source for causing a photocatalyst, a light emitting element for irradiating a predetermined sample with measurement light, and has arrived via the sample. A light amount detection unit having a light receiving element that receives light, and a photocatalytic function evaluation device that evaluates a photocatalytic function based on a result obtained by the light receiving element, wherein the activation light sources have different wavelengths. The light amount detection unit includes a reference sample detection unit for a sample serving as a reference when evaluating the photocatalytic function, and an evaluation sample detection unit for a sample whose photocatalytic function is evaluated. Wherein the optical arrangement of the reference sample detection unit and the evaluation sample detection unit with respect to the plurality of lamps is the same.
According to a second aspect of the present invention, in the first aspect of the present invention, the activation light source has a lamp for irradiating light in an ultraviolet region and a lamp for irradiating light in a visible light region. Features.
According to a third aspect of the present invention, in the first aspect of the invention, a partition having a predetermined height is provided between the reference sample detecting section and the evaluation sample detecting section. It is characterized by having.
An invention according to claim 4 is a method for evaluating a photocatalytic function using the apparatus for evaluating a photocatalytic function according to any one of claims 1 to 3, wherein the photocatalytic function is evaluated from the activation light source. In order to evaluate the photocatalytic function from the light-emitting elements of the reference sample detection unit and the evaluation sample detection unit with respect to the reference sample and the evaluation sample, while irradiating the reference sample and the evaluation sample with the light to be caused. Irradiating the light, the light arrived via the reference sample and the evaluation sample is received by the light receiving element of the detection unit for the reference sample and the detection unit for the evaluation sample, respectively, of the light received by each light receiving element The amount of light is compared, and the photocatalytic function is evaluated based on the result of the comparison.
[0013]
In the present invention, since the light amount obtained by irradiating the reference sample and the evaluation sample is compared with the light amount obtained by irradiating the reference sample, the photocatalytic function is evaluated based on the comparison result. Fluctuations that occur in the elements and amplifier circuits that process the detection results of the light-receiving elements are canceled out, and only changes in output due to photocatalytic activity are detected with high sensitivity, enabling accurate photocatalytic function evaluation. become.
[0014]
In particular, in the photocatalyst evaluation device of the present invention, since the optical arrangement of the detection unit for the reference sample and the detection unit for the evaluation sample for a plurality of lamps having different wavelengths is the same, for example, the photocatalytic function using ultraviolet light and visible light is used. Can be made to have the same conditions in the reference sample and the evaluation sample, whereby the photocatalytic function can be accurately evaluated for a wide range of light.
[0015]
In the present invention, if a partition is provided between the reference sample detection unit and the evaluation sample detection unit, the light detected by the reference sample detection unit and the light detected by the evaluation sample detection unit are detected. Since the light does not influence each other, the light amount detected by the reference sample detection unit and the evaluation sample detection unit becomes more accurate.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a plan view illustrating a schematic configuration of a photocatalytic function evaluation device according to a first embodiment of the present invention, and FIG. 2 is a plan view illustrating a state where a sample is installed in the photocatalytic function evaluation device.
FIG. 3 is a side view showing a schematic configuration of the photocatalytic function evaluation device, and FIG. 4 is an enlarged view around a sample of the photocatalytic function evaluation device.
[0018]
FIG. 5 is a graph showing the relationship between the wavelength of light emitted by the fluorescent lamp of the photocatalytic function evaluation device and the emission intensity. FIG. 6 shows the characteristics of an ultraviolet cut filter mounted on the fluorescent lamp in the photocatalytic function evaluation device. It is a graph shown.
[0019]
As shown in FIGS. 1 and 3, the evaluation device 1 for photocatalytic function of the present embodiment has an elongated box-shaped case 10 provided on a base 2. The components are housed.
[0020]
At one end of the case 10, a fan 8 for introducing outside air to cool the inside of the case 10 is provided.
[0021]
The photocatalytic function evaluation apparatus 1 of the present embodiment includes a black light lamp 3 and a fluorescent lamp 4 as an activation light source L for causing a photocatalyst to occur.
[0022]
The black light lamp 3 and the fluorescent lamp 4 are formed in an elongated shape, and are arranged adjacent to each other in the upper part of the center of the case 10 in parallel along the longitudinal direction of the case 10.
[0023]
A concave reflecting mirror 5 is provided so as to surround above the black light lamp 3 and the fluorescent lamp 4.
[0024]
The black light lamp 3 and the fluorescent lamp 4 are arranged at the same distance from a reference sample 30 and an evaluation sample 31, which will be described later.
[0025]
The black light lamp 3 and the fluorescent lamp 4 emit light of different wavelengths.
[0026]
In the case of the present embodiment, the black light lamp 3 emits light having a wavelength of about 340 nm to 400 nm.
[0027]
On the other hand, the fluorescent lamp 4 emits light having a wavelength of about 300 nm to 750 nm (see FIG. 5), but the light emitted from the fluorescent lamp 4 includes light in the ultraviolet region. An ultraviolet cut filter 4a is mounted on the outer periphery of the lamp 4, whereby the fluorescent lamp 4 emits light having a wavelength of 400 nm to 750 nm excluding ultraviolet light (see FIG. 6).
[0028]
The switching between the black light lamp 3 and the fluorescent lamp 4 is performed by a switch (not shown).
[0029]
The photocatalytic function evaluation apparatus 1 according to the present embodiment includes, as a light amount detection unit S for evaluating the photocatalytic function, a reference sample for detecting the light amount of the reference sample 30 serving as a reference when the photocatalytic function is evaluated. And an evaluation sample detecting unit 21 for detecting the light amount of the evaluation sample 31 to be evaluated.
[0030]
Here, the reference sample detecting section 20 includes the light emitting element 6 and the light receiving element 11 that form a pair, and the evaluation sample detecting section 21 includes the light emitting element 7 and the light receiving element 12 that form a pair. .
[0031]
The light emitting elements 6 and 7 are configured to emit pulse light (irradiation light 26 and 27) having a constant period by using, for example, a light emitting diode.
[0032]
In the case of the present embodiment, the light emitting element 6 and the light receiving element 11 of the reference sample detecting section 20 are arranged at the same height and symmetrically with the black light lamp 3 and the fluorescent lamp 4 interposed therebetween.
[0033]
Further, the light emitting element 7 and the light receiving element 12 of the measurement sample detecting section 22 are also arranged at the same height and symmetrically with respect to the black light lamp 3 and the fluorescent lamp 4.
[0034]
The light emitting element 6 and the light receiving element 11 of the reference sample detecting section 20 and the light emitting element 7 and the light receiving element 12 of the measuring sample detecting section 22 are the same optical elements for the black light lamp 3 and the fluorescent lamp 4 respectively. It is configured so as to have a strategic arrangement.
[0035]
As shown in FIG. 2, in the case of the present embodiment, the reference sample 30 is disposed between the light emitting element 6 and the light receiving element 11 of the reference sample detecting section 20 and directly below the black light lamp 3 and the fluorescent lamp 4. It has become so.
[0036]
As the reference sample 30, a sample having no photocatalytic function, for example, a sample in which the same colored layer as a colored layer 31c of an evaluation sample 31 described later is formed on a base material is used.
[0037]
On the other hand, the measurement sample 31 is arranged between the light-emitting element 7 and the light-receiving element 12 of the measurement sample detection unit 22 directly below the black light lamp 3 and the fluorescent lamp 4.
[0038]
As shown in FIG. 3, the reference sample 30 or the evaluation sample 31 is placed on a reflection paper 40 or 41 disposed on the base 2.
[0039]
As shown in FIG. 4, in the evaluation sample 31, a photocatalytic function film 31b having a photocatalytic function is formed on a transparent base material 31a, and light is transmitted on the photocatalytic function film 31b by the photocatalytic action of the photocatalytic function film 31b. The coloring layer 31c whose rate changes is formed.
[0040]
As shown in FIG. 3, the light receiving element 6 of the reference sample detecting section 20 is connected to the detecting circuit 9, and the light receiving element 12 of the evaluation sample detecting section 21 is connected to the detecting circuit 13.
[0041]
These detection circuits 9 and 13 are configured to output electric signals corresponding to the amounts of reflected light 27 and 28 received by the light receiving elements 6 and 12, respectively.
[0042]
FIG. 7 is a block diagram showing a main part of a control system of the photocatalytic function evaluation device of the present embodiment.
As shown in FIG. 7, the black light lamp 3, the fluorescent lamp 4, the light emitting element 6, the light emitting element 12, the detection circuit 9, and the detection circuit 13 of the present embodiment are connected to a control unit 14 of a computer (not shown). I have.
[0043]
The control unit 14 measures the amount of received light detected by the detection circuit 9 or 13, performs an operation for obtaining a difference between the measured amounts of received light data, and evaluates the photocatalytic function of the evaluation sample 31 based on a predetermined algorithm. Has a function.
[0044]
In order to evaluate the photocatalytic function in the present embodiment having such a configuration, first, the reference sample 30 and the evaluation sample 31 are arranged at the predetermined positions, and the black light lamp 3 or the fluorescent lamp 4 emits light. The sample 30 and the evaluation sample 31 are irradiated with light from the black light lamp 3 and the fluorescent lamp 4.
[0045]
Thus, in the evaluation sample 31, the photocatalytic function film 30b is activated by light irradiation, and the light transmittance of the colored layer 31c changes over time, and the intensity of the reflected light changes.
[0046]
On the other hand, when the reference sample 30 is irradiated with light by the black light lamp 3 or the fluorescent lamp 4, the light transmittance of the colored layer does not change.
[0047]
In this state, the reference sample 30 and the evaluation sample 31 are irradiated with irradiation light 25 and 26 from the light emitting element 6 of the reference sample detecting unit 20 and the light emitting element 12 of the evaluation sample detecting unit 21, respectively. The reflected lights 27 and 28 reflected by the evaluation sample 31 are received by the light receiving elements 7 and 11 of the detection unit 20 for the reference sample and the detection unit 21 for the evaluation sample.
[0048]
The received reflected lights 27 and 28 are converted by the detection circuits 9 and 13 into electric signals corresponding to the amount of received light and output to the control unit 14.
[0049]
The control unit 14 measures the amount of light received by the light receiving elements 7 and 11 from the output electric signal, performs an operation to obtain a difference between the measured data (differential method), and changes (decreases) the absorbance based on the difference. Speed, etc.) to evaluate the photocatalytic function of the evaluation sample 31.
[0050]
As described above, according to the present embodiment, the amount of light obtained by irradiating the reference sample 30 and the amount of light obtained by irradiating the evaluation sample 31 are compared, and the photocatalytic function is determined based on the comparison result. Is evaluated, the fluctuations generated in the light receiving elements 6, 11 and the amplification circuit for processing the detection results of the light receiving elements 6, 11 are canceled out, and only the output change due to the activation force of the photocatalyst is detected with high sensitivity. As a result, the photocatalytic function can be accurately evaluated.
[0051]
In particular, in the present embodiment, since the optical arrangement of the reference sample detection unit 20 and the evaluation sample detection unit 21 with respect to the black light lamp 3 and the fluorescent lamp 4 is the same, the photocatalyst using ultraviolet light and visible light is used. When evaluating the function, the conditions in the reference sample 30 and the evaluation sample 31 can be made the same, whereby the photocatalytic function can be accurately evaluated for a wide range of light.
[0052]
Hereinafter, a second embodiment of the present invention will be described.
FIG. 8 is a plan view illustrating a schematic configuration of the photocatalytic function evaluation device of the present embodiment, and FIG. 9 is a cross-sectional view illustrating a schematic configuration of the photocatalytic function evaluation device. Are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0053]
As shown in FIGS. 8 and 9, the photocatalytic function evaluation device 1 </ b> A of the present embodiment includes a rectangular flat plate-shaped partition (partition) between the reference sample detection unit 20 and the evaluation sample detection unit 21. 33 are provided.
[0054]
As shown in FIG. 9, the upper end of the partition plate 33 is higher than the light emitting portions of the light emitting elements 6 and 7 and the light receiving portions of the light receiving elements 11 and 12, and the black light lamp 3 and the fluorescent lamp 4 Has a predetermined gap.
[0055]
In the case of the present invention, the size of the gap between the upper end portion of the partition plate 33 and the black light lamp 3 and the fluorescent lamp 4 is not particularly limited, but in order to smoothly circulate the introduced atmosphere. , 9 mm to 15 mm.
[0056]
Further, regarding the width of the partition plate 33, from the viewpoint of preventing the influence of light between the detection unit 20 for the reference sample and the detection unit 21 for the evaluation sample, the light emitting portions of the light emitting elements 6, 7 and the light receiving elements 11, It is preferable to set the distance slightly larger than the interval between the twelve light receiving portions.
[0057]
According to the present embodiment having such a configuration, since the partition plate 33 is provided between the reference sample detection unit 20 and the evaluation sample detection unit 21, the detection is performed by the reference sample detection unit 20. Since the light and the light detected by the evaluation sample detecting section 21 do not affect each other, the light amounts detected by the reference sample detecting section 20 and the evaluation sample detecting section 21 become more accurate. The other configuration and operation and effect are the same as those of the above-described embodiment, and a detailed description thereof will be omitted.
[0058]
Note that the present invention is not limited to the above-described embodiment, and various changes can be made.
For example, in the above-described embodiment, the light-emitting elements of the detection unit for the reference sample and the detection unit for the evaluation sample are arranged on the same side with respect to the activation light source, but as long as the optical arrangement is the same, It is also possible to arrange the light emitting element on the opposite side across the activation light source.
[0059]
Further, in the above embodiment, one detection unit for the evaluation sample and one detection unit for the reference sample are provided, but two or more detection units for the evaluation sample are provided for one detection unit for the reference sample. It is also possible to provide.
[0060]
Further, the number of lamps of the activation light source is not limited to the number of the above-described embodiments, and three or more lamps having different wavelengths can be provided.
[0061]
Furthermore, the size, shape, and the like of the partition are not limited to those in the above-described embodiment. For example, the partition may be formed in a size and shape so as to substantially partition the inside of the case, and the partition may be provided with fine holes for circulating the atmosphere in the case. Further, a configuration may be adopted in which a mesh is provided in a partition part having a similar size and shape.
[0062]
In addition, in the above embodiment, measurement is performed by irradiating the reference sample and the evaluation sample with light and receiving the reflected light thereof, but irradiating the reference sample and the evaluation sample with light and receiving the transmitted light thereof It is also possible to perform the measurement.
[0063]
【The invention's effect】
As described above, according to the present invention, the amount of light obtained by irradiating the reference sample and the amount of light obtained by irradiating the evaluation sample are compared, and the photocatalytic function is evaluated based on the comparison result. As a result, fluctuations occurring in the light-receiving element and the amplifier circuit that processes the detection result of the light-receiving element are offset, and only changes in output due to the activation force of the photocatalyst can be detected with high sensitivity. Can be evaluated.
[0064]
In particular, in the photocatalyst evaluation device of the present invention, since the optical arrangement of the detection unit for the reference sample and the detection unit for the evaluation sample for a plurality of lamps having different wavelengths is the same, for example, the photocatalytic function using ultraviolet light and visible light is used. Can be made the same in the reference sample and the evaluation sample, whereby the photocatalytic function can be accurately evaluated for a wide range of light.
[0065]
In the photocatalyst evaluation device of the present invention, if a partition is provided between the reference sample detection unit and the evaluation sample detection unit, the light detected by the reference sample detection unit and the evaluation sample detection unit Since the light detected in step (1) does not affect each other, the light quantity can be detected more accurately in the reference sample detection section and the evaluation sample detection section.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic configuration of a photocatalytic function evaluation device according to a first embodiment of the present invention.
FIG. 2 is a plan view showing a state where a sample of the photocatalytic function evaluation device is installed.
FIG. 3 is a side view showing a schematic configuration of the photocatalytic function evaluation device.
FIG. 4 is an enlarged view around a sample of the photocatalytic function evaluation apparatus.
FIG. 5 is a graph showing a relationship between a wavelength of light emitted by a fluorescent lamp of the photocatalytic function evaluation device and an emission intensity.
FIG. 6 is a graph showing characteristics of an ultraviolet cut filter mounted on a fluorescent lamp in the photocatalytic function evaluation device.
FIG. 7 is a block diagram showing a main part of a control system of the photocatalytic function evaluation device.
FIG. 8 is a plan view illustrating a schematic configuration of a photocatalytic function evaluation device according to a second embodiment of the present invention.
FIG. 9 is a cross-sectional view illustrating a schematic configuration of the photocatalytic function evaluation device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Photocatalytic function evaluation device 3 Black light lamp 4 Fluorescent lamp 6 Light emitting element 7 Light receiving element 11 Light emitting element 12 Light receiving element 20 Detector for reference sample 21 Detector for evaluation sample 30 Reference sample 31 Evaluation sample 33 Partition plate (partition part)
L Activating light source S Light amount detection unit

Claims (4)

光触媒を起こさせるための活性化光源と、測定光を所定の試料に照射するための発光素子と、当該試料を介して到達した光を受光する受光素子とを有する光量検出部とを備え、前記受光素子にて得られた結果に基づいて光触媒機能を評価する光触媒機能評価装置であって、
前記活性化光源は波長の異なる複数のランプを有し、前記光量検出部は、光触媒機能を評価する際の基準となる試料のための基準試料用検出部と、光触媒機能が評価される試料のための評価試料用検出部とを備え、前記基準試料用検出部と評価試料用検出部の前記複数のランプに対する光学的配置が同一であることを特徴とする光触媒機能評価装置。An activation light source for causing a photocatalyst, a light emitting element for irradiating a predetermined sample with measurement light, and a light amount detection unit having a light receiving element for receiving light that has reached via the sample, A photocatalytic function evaluation device that evaluates a photocatalytic function based on a result obtained by a light receiving element,
The activation light source has a plurality of lamps having different wavelengths, the light quantity detection unit is a reference sample detection unit for a sample serving as a reference when evaluating the photocatalytic function, and a sample for which the photocatalytic function is evaluated. A photocatalyst function evaluation device, comprising: a detection unit for an evaluation sample for detecting the reference sample; and an optical arrangement of the detection unit for the reference sample and the detection unit for the evaluation sample with respect to the plurality of lamps. 前記活性化光源は、紫外線領域の光を照射するためのランプと、可視光領域の光を照射するためのランプとを有することを特徴とする請求項１記載の光触媒機能評価装置。The photocatalytic function evaluation device according to claim 1, wherein the activation light source includes a lamp for irradiating light in an ultraviolet region and a lamp for irradiating light in a visible light region. 前記基準試料用検出部と評価試料用検出部との間に所定の高さの仕切り部が設けられていることを特徴とする請求項１又は２のいずれか１項記載の光触媒機能評価装置。The photocatalytic function evaluation device according to claim 1, wherein a partition having a predetermined height is provided between the reference sample detection unit and the evaluation sample detection unit. 請求項１乃至３のいずれか１項記載の光触媒機能の評価装置を用いて光触媒機能を評価する光触媒機能の評価方法であって、
前記活性化光源から光触媒機能を起こさせる光を前記基準試料と前記評価試料とに照射しつつ、
前記基準試料と前記評価試料に対して前記基準試料用検出部及び前記評価試料用検出部の発光素子から光触媒機能を評価するための光を照射し、前記基準試料と前記評価試料を介して到達した光を前記基準試料用検出部及び前記評価試料用検出部の受光素子によってそれぞれ受光し、
当該各受光素子で受光した光の光量を比較し、当該比較の結果に基づいて光触媒機能を評価することを特徴とする光触媒機能の評価方法。A photocatalytic function evaluation method for evaluating a photocatalytic function using the photocatalytic function evaluation apparatus according to claim 1,
While irradiating the reference sample and the evaluation sample with light for causing a photocatalytic function from the activation light source,
The reference sample and the evaluation sample are irradiated with light for evaluating a photocatalytic function from the light-emitting elements of the detection unit for the reference sample and the detection unit for the evaluation sample, and reach through the reference sample and the evaluation sample. The received light is received by the light receiving elements of the detection unit for the reference sample and the detection unit for the evaluation sample, respectively.
A method for evaluating a photocatalytic function, comprising comparing the amounts of light received by the respective light receiving elements and evaluating the photocatalytic function based on the result of the comparison.
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