JP7336695B2 - 光学装置 - Google Patents
光学装置 Download PDFInfo
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- JP7336695B2 JP7336695B2 JP2021554076A JP2021554076A JP7336695B2 JP 7336695 B2 JP7336695 B2 JP 7336695B2 JP 2021554076 A JP2021554076 A JP 2021554076A JP 2021554076 A JP2021554076 A JP 2021554076A JP 7336695 B2 JP7336695 B2 JP 7336695B2
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
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- G01J1/0455—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings having a throughhole enabling the optical element to fulfil an additional optical function, e.g. a mirror or grating having a through-hole for a light collecting or light injecting optical fibre
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- G01N21/3151—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using two sources of radiation of different wavelengths
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Description
図1は、水分検知装置1の外観構成を示す斜視図である。
図5は、水分検知装置1の回路部の構成を示すブロック図である。
次に、堆積物の種類の判定方法について説明する。
次に、集光ミラー30の反射面30aの形成方法について説明する。
次に、反射面30aおよび光検出器40の受光面の調整方法について説明する。
調整方法1では、図8に示した第2焦点位置FP2が、計測距離レンジの最遠距離位置(15m)と最近距離位置(2m)との間の距離位置(たとえば4m)に設定され、光検出器40の受光面は、第1焦点位置FP1の位置に位置付けられる。また、最遠距離位置において反射された反射光R1の受光面上におけるスポットサイズが受光面以下のサイズとなるように、受光面のサイズが設定される。
調整方法2では、図8に示した第2焦点位置FP2が、計測距離レンジの最遠距離位置(15m)に設定され、光検出器40の受光面が第1焦点位置FP1の位置に位置付けられる。また、最近距離位置において反射された反射光R1の受光面上におけるスポットサイズよりも受光面のサイズが小さくなるように、受光面が設定される。
調整方法3では、図8に示した第2焦点位置FP2が、計測距離レンジの最遠距離位置(15m)に設定され、光検出器40の受光面が第1焦点位置FP1に対して反射面30a側にシフトした位置に位置付けられる。また、最遠距離位置において反射された反射光R1の受光面上におけるスポットサイズが受光面のサイズと同等となり、且つ、最近距離位置において反射された反射光R1の受光面上におけるスポットサイズよりも受光面のサイズが小さくなるように、受光面が設定される。
次に、上記実施形態1に係る水分検知装置1を用いたシステム構成例について説明する。
実施形態1によれば、以下の効果が奏される。
図13は、実施形態1の変更例に係る水分検知装置1の構成を示す斜視図である。
上記実施形態1では、貫通孔30bの出口で散乱された照明光L1が、遮光部材60の遮光マスク60aによって遮光された。これに対し、実施形態2では、光検出器40に対向する貫通孔の内側面に切り欠きを設けることにより、光検出器40に対する散乱光の入射が抑制される。
上記実施形態1、2では、集光ミラー30に貫通孔30bを形成することにより、光源部20の光軸A1と集光ミラー30の光軸A2とを整合させた。これに対し、実施形態3では、小さなミラーを用いて、光源部20の光軸A1と集光ミラーの光軸A2とを整合させる。
上記実施形態1~3および変更例では、3種類の波長の光が照明光L1として用いられたが、照明光L1として用いる波長の種類は3つに限られるものではない。たとえば、参照波長の照明光L1と吸収波長の照明光L1とをそれぞれ出射する2つの光源と、路面の温度を検出する放射温度センサとを用いて、堆積物の種類を判定してもよい。この場合、光源部20から、ダイクロイックミラー24、25の何れか一方が省略される。
3a1、3a2 検知領域
20 光源部
20a 整合光学系
27 光学素子
21a、21b、21c 光源
30、31、32、33 集光ミラー
30a、31a、32a、33a 反射面
30b、31b、32b 貫通孔
30d、31d、32d、33b 柱状部
32f 切り欠き
40 光検出器
40a 受光面
60a 遮光マスク
111 判定部
FP1 第1焦点位置
FP2 第2焦点位置
AX1 長軸
A1、A2、A10 光軸
L1 照明光
R1 反射光
P0 四角柱(柱体)
Claims (15)
- 検知領域に向かって照明光を投射する光源部と、
前記検知領域で反射された前記照明光の反射光を受光する光検出器と、
前記反射光を前記光検出器に集光させる集光ミラーと、を備え、
前記集光ミラーは、前記光源部から出射された前記照明光を通過させて、前記光源部の光軸と前記集光ミラーの光軸とを互いに整合させる貫通孔を有し、
前記集光ミラーの反射面は、前記照明光の投射方向に延びる柱体を、長軸を回転軸とする回転楕円面で切り取った形状を有し、
前記集光ミラーに対して前記集光ミラーの第1焦点位置に向かう方向に前記光検出器が配置され、前記集光ミラーに対して前記集光ミラーの第2焦点位置に向かう方向に前記検知領域が設定される、
ことを特徴とする光学装置。
- 請求項1に記載の光学装置において、
前記柱体は、四角柱である、
ことを特徴とする光学装置。
- 請求項1または2に記載の光学装置において、
前記貫通孔は、前記光検出器に対向する内側面に切り欠きを有する、
ことを特徴とする光学装置。
- 請求項1または2に記載の光学装置において、
前記貫通孔の出口と前記光検出器との間に、前記貫通孔の出口で散乱した前記照明光を遮光するための遮光マスクを備える、
ことを特徴とする光学装置。
- 請求項1ないし4の何れか一項に記載の光学装置において、
前記第2焦点位置は、計測距離レンジの最遠距離位置に設定される、
ことを特徴とする光学装置。
- 請求項5に記載の光学装置において、
前記光検出器の受光面は、前記第1焦点位置に配置される、
ことを特徴とする光学装置。
- 請求項5に記載の光学装置において、
前記光検出器の受光面は、前記最遠距離位置において反射された前記反射光のスポットサイズが前記光検出器の受光面と同等サイズとなるように、前記第1焦点位置に対して前記反射面側にシフトした位置に配置される、
ことを特徴とする光学装置。 - 請求項1ないし4の何れか一項に記載の光学装置において、
前記第2焦点位置は、計測距離レンジの最遠距離位置と最近距離位置との間の距離位置に設定され、
前記光検出器の受光面は、前記第1焦点位置に配置され、
前記光検出器は、前記最遠距離位置において反射された前記反射光の前記光検出器の受光面上におけるスポットサイズが前記受光面以下のサイズとなるように、受光面のサイズが設定される、
ことを特徴とする光学装置。 - 請求項5ないし7の何れか一項に記載の光学装置において、
前記光検出器の受光面は、計測距離レンジの最近距離位置において反射された前記反射光の前記受光面上におけるスポットサイズよりも小さい、
ことを特徴とする光学装置。 - 請求項1ないし9の何れか一項に記載の光学装置において、
前記光源部は、
互いに異なる波長の光を出射する複数の光源と、
前記各光源の出射光軸を互いに整合させる整合光学系と、を備える、
ことを特徴とする光学装置。
- 請求項10に記載の光学装置において、
前記光検出器の検出信号に基づいて前記検知領域における堆積物を判定する判定部を備える、
ことを特徴とする光学装置。
- 請求項11に記載の光学装置において、
前記光源部は、互いに異なる第1波長、第2波長および第3波長の光をそれぞれ出射する第1光源、第2光源および第3光源を備え、
前記第1光源、前記第2光源および前記第3光源のうち2つの光源は、それぞれ、水および氷に対する吸収係数が高い波長の検出用の光を出射し、残り1つの光源は、水および氷に対する吸収係数が低い波長の参照用の光を出射し、
前記判定部は、前記2つの検出用の光に対する前記検出信号を、前記参照用の光に対する前記検出信号により規格化した信号に基づいて、前記堆積物を判定する、
ことを特徴とする光学装置。
- 請求項12に記載の光学装置において、
前記判定部は、前記堆積物として、水、氷および雪を判定する、
ことを特徴とする光学装置。
- 検知領域に向かって照明光を投射する光源部と、
前記検知領域で反射された前記照明光の反射光を受光する光検出器と、
前記反射光を前記光検出器に集光させる集光ミラーと、を備え、
前記集光ミラーの反射面は、前記照明光の投射方向に延びる柱体を、前記投射方向に平行な長軸を回転軸とする回転楕円面で切り取った形状を有し、
前記集光ミラーに対して前記集光ミラーの第1焦点位置に向かう方向に前記光検出器が配置され、前記集光ミラーに対して前記集光ミラーの第2焦点位置に向かう方向に前記検知領域が設定される、
ことを特徴とする光学装置。
- 請求項14に記載の光学装置において、
前記光源部の光軸と前記集光ミラーの光軸とを互いに整合させる光学素子を備える、
ことを特徴とする光学装置。
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