{"created":"2023-05-15T15:23:26.960072+00:00","id":10268,"links":{},"metadata":{"_buckets":{"deposit":"e4fdcc23-5111-43be-b52e-87ec5f0ca173"},"_deposit":{"created_by":15,"id":"10268","owners":[15],"pid":{"revision_id":0,"type":"depid","value":"10268"},"status":"published"},"_oai":{"id":"oai:sucra.repo.nii.ac.jp:00010268","sets":["94:429:431:432:502"]},"author_link":["17553"],"item_113_biblio_info_9":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1998","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"111","bibliographicPageStart":"1"}]},"item_113_date_35":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2011-10-25","subitem_date_issued_type":"Created"}]},"item_113_description_23":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"分光放射測定や検出器の分光応答度の測定に用いられる放射検出器として、分光応答度が広い波長波長範囲で一定であるような放射検出器が要望されていて、その目的で熱形放射検出器が使用されている。熱形放射検出器の放射吸収層は、入射した放射に対する吸収率が高く、入力した放射を熱に変換し、それを熱電変換素子面に効率よく伝達させるために熱伝導度が大きいことも必要となる。これらの要求を満たす放射吸収層材料として、金属黒が用いられている。先行研究により、吸収層が十分厚いときには、放射吸収層の分光吸収特性が、検出器の分光応答特性とよく一致すること、また、金黒を放射吸収材とした熱形放射検出器の応答度が金黒膜厚依存性を有することが明らかになった。\n本研究では、その結果を解析して、まず、金黒を受光面(放射吸収層)とした平面形状の熱形放射検出器の金黒膜厚が変化したときに、分光応答度が変化する状態を放射吸収層内の入射エネルギーの吸収、反射を考慮したモデルを導入して検討して、まず、入射光が放射吸収層の表面付近で吸収され、そこから放射吸収層内を熱となって伝導すると仮定するモデルを定式化し、その式と実測値を用いて、吸収係数と損失係数を見積もった。\nさらに、より正確なモデルとして、入射光が放射吸収層内で徐々に吸収され、吸収された位置で熱に変換され、そこから放射吸収層を熱となって伝導すると仮定したモデルを考案し、見積もった吸収係数と損失係数を用いて、有効発熱量の金黒膜厚依存性の計算結果と実測値を比較した。この結果、今回考案したモデルで、分光応答度の金黒膜厚依存性が説明できることが分かった。\nしかし、紫外・可視域で良好な応答特性を示す条件で作製した金黒を比較的薄く塗布した検出器は、可視長波長端から赤外域では分光応答特性に波長依存性が生じた。そこでこれらの問題を解決する方策として、筆者らは検出器の受光面を内に凹の空洞円錐形状(コーン形)に作り、入射光を繰り返し反射させて実効的な反射率を下げ、かつ波長依存性をなくすことを考案した。この形状の受光面の有効性を定量的に検証するために、受光面の円錐の頂角及び受光面の吸収材の反射率を変え、それらが実効的な反射率に及ぼす影響を調べた。 実験は製作の比較的容易なC a S O4 (石膏)で模形的な受光面を作り、この受光面に波長依存性の少ない反射率0.1~0.6程度の聞の5種類の灰色塗料(つやあり、なし)を塗布したモデル試料を用いて行った。 この結果、モデル試料の実効的な反射率は円錐の頂角及び、塗料の反射率に依存し、一般に頂角が小さく、かつ、塗料の反射率が低くなるほど、塗料自体の反射率よりも低下する度合いが大きいこと、また、その効果はつやのある塗料の方がより大きいことが認められた。そしてこれらの結果を説明するために、吸収と繰り返し反射のモデルによる近似計算式を立て、反射の減少の度合いを定量的に予測することを試みた。 この結果、金黒を円錐形状の受光面の吸収材として塗布した場合の実効的な反射率を見積もることが可能になった。\n上記円錐形状受光面の基礎的検討を基に金黒塗布空洞円錐形状熱形放射検出器の特性の検討を行った。まず、紫外・可視域における検出器の分光反射率および分光応答度を測定した。これにより、金黒膜厚が11μmの平面形状検出器の反射率0.8%が、空洞円錐形状にすることにより、0.15%程度になり、約1/5に減少することが分かった。また、分光応答度の平坦性(波長に対する一定性)の外れが±0.3%以内である放射検出器を実現する見通しを得た。\n次に、赤外域における金黒塗布空洞状熱形放射検出器の特性を検討した。紫外・可視域で良好な特性を示した金黒膜厚11μmの検出器は、可視域と比較して赤外域では金黒の吸収率が低くなり、従ってこの領域での応答度の低下と波長選択性が生じた。そこで、改めて、紫外・可視域とは異なる条件で、応答度ができるだけ高く、かつ波長に対して非選択性である金黒の製作条件を検討した。この結果窒素ガス圧2.0torrで作製した膜厚70μm以上の金黒を塗布した平面形状試料が波長0.6~2. 2μmにおいて、反射率が1%未満となることが確認でき、さらに空洞円錐形状に加工することにより、頂角30度の検出器は反射率が0.2%以下になることが分かった。この金黒塗布空洞円錐形状検出器の反射率の頂角及び金黒の反射率依存性をモデル試料(灰色塗料)で導いた計算式を用いて説明した。これらの検討により3%程度の反射率の金黒を70μm程度付着し、これを頂角60度の円錐形状にすることによって赤外域においても、反射率が1% 以内で反射率、応答度が一定であるような波長非選択性の熱形放射検出器の実現の可能性が確認できた。\n\nA radiation detector with constant spectral responsivity is needed as a reference standard when measuring optical radiation power and the spectral responsivity of a radiation detector. Until now thermal radiation detectors have been used as the reference standard. A thermal detector is one of the photosensors which absorbs optical radiation and transfers it to heat. Then an increase in temperature generates an electric signal through a thermoelectric or pyroelectric effect. Although the spectral responsivity of a thermal radiation detectors has been considered to be dependant on spectral absorption characteristics of the receiving surface, it has not been investigated thoroughly yet. Therefore the authors fabricated a plain type thermal radiation detector with evaporating gold-black as the surface absorbent attached to a thermoelectric detector. The spectral responsivity of the thermal radiation detector under different evaporating conditions was investigated and the best conditions for the highest degree of spectral responsivity were reported.\nThe dependence of the relative spectral responsivity of thermal radiation detectors on the thickness of the gold-black layer was studied using models that consider absorption and reflection of incident radiant energy within the absorber. In the models, incident radiant energy is absorbed near the surface and transmitted through the gold-black absorber as heat. The models were formulated, and the absorption and loss coefficients were estimated using the formulation and real data. In an effect to gain more accurate models, incident radiant energy was assumed to be absorbed gradually within the absorber and transmitted through it as heat. The dependence calculated using the models corresponded well with the experimental data.\nIn order to attain a highly sensitive thermal radiation detector with constant spectral responsivity, conical cavity type detectors were fabricated. The detectors were expected to increase effective absorptance through repeated mutual reflections. The dependence of the effective reflectance of cavity type thermal radiation detectors on reflectance of the absorbent on the core and the cone apex were studied by making model samples. Using the samples, data concerning the correlation between the cone apex angle(90°、60°、45°) and the various reflectance (0.1～0.6) of the absorbents on the cone was collected. The dependence of the effective reflectance of the conical cavity on the reflectance of the absorbent was formulated with a model considering the first step of reflection of uniform incident light and the second step of repeated mutual reflections. The model illustrates well the dependence of the effective reflectance on the reflectance of the absorbent.\nOn the basis of the fundamental considerations mentioned above, characteristivs of conical cavity type thermal radiation detectors with gold-black coating were studied. The reflectance and relative spectral responsivity of a thermal radiation detector were measured in the UV region. It was shown that the effective reflectance of the conical cavity type detector with the cone apex angle 45°decreased reflection by 1/5 of that of the plain type one. In the IR region, different conditions for fabricating gold-black absorbents were suggested. Under the fabricating conditions of 2 torr nitrogen pressure, the reflectance of the plain type sample was less than 1% and the conical cavity type less was than 0.25%. These results were explained in the models mentioned above. It was concluded that thermal radiation detectors with a cone vertex of 60% showed constant reflectance of less than 1% with 3% reflectance of gold-black absorbent in the wave range of UV to IR was possible.","subitem_description_type":"Abstract"}]},"item_113_description_25":{"attribute_name":"注記","attribute_value_mlt":[{"subitem_description":"主指導教官 : 中川靖夫教授","subitem_description_type":"Other"}]},"item_113_description_33":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"text","subitem_description_type":"Other"}]},"item_113_description_34":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_113_record_name_8":{"attribute_name":"書誌","attribute_value_mlt":[{"subitem_record_name":"博士論文(埼玉大学大学院理工学研究科(博士後期課程))"}]},"item_113_text_3":{"attribute_name":"著者 ローマ字","attribute_value_mlt":[{"subitem_text_value":"ARAKI, Yoshikazu"}]},"item_113_text_36":{"attribute_name":"アイテムID","attribute_value_mlt":[{"subitem_text_value":"GD0000283"}]},"item_113_text_4":{"attribute_name":"著者 所属","attribute_value_mlt":[{"subitem_text_value":"埼玉大学大学院理工学研究科情報数理科学専攻"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"荒木, 慶和","creatorNameLang":"ja"},{"creatorName":"アラキ, ヨシカズ","creatorNameLang":"ja-Kana"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-01-23"}],"displaytype":"detail","filename":"GD0000283.pdf","filesize":[{"value":"54.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"GD0000283.pdf","url":"https://sucra.repo.nii.ac.jp/record/10268/files/GD0000283.pdf"},"version_id":"a782770e-bf35-4ff0-bcfc-15063c81d0f7"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"thesis","resourceuri":"http://purl.org/coar/resource_type/c_46ec"}]},"item_title":"空洞状熱形放射検出器に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"空洞状熱形放射検出器に関する研究","subitem_title_language":"ja"}]},"item_type_id":"113","owner":"15","path":["502"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2011-10-21"},"publish_date":"2011-10-21","publish_status":"0","recid":"10268","relation_version_is_last":true,"title":["空洞状熱形放射検出器に関する研究"],"weko_creator_id":"15","weko_shared_id":-1},"updated":"2023-07-31T07:49:50.519756+00:00"}