JP6022456B2 - 時間領域信号の減衰定数を決定する方法とシステム - Google Patents
時間領域信号の減衰定数を決定する方法とシステム Download PDFInfo
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Description
当該基本周波数における、及び当該基本周波数以外の一の周波数における当該変換時間減衰信号それぞれの大きさを決定することとを含む。
当該基本周波数における、及び当該複数の高調波周波数それぞれの周波数における当該変換時間減衰信号それぞれの大きさを決定する一の決定器とを含む。
当該基本周波数における、及び当該複数の高調波周波数のそれぞれの周波数における当該変換時間領域信号のそれぞれの大きさを決定する一の決定器とを含む。
約10Hzで発射する、ライン幅0.04nmを有するパルスN2レーザ励起色素レーザが、CRDS測定システム用レーザ源として使用された。真空状態キャビティ(圧力P<13Pa(0.1Torr))及び当該キャビティ内にNO2(最初は現行未知濃度)を有するもの双方に対する、各被尋問波長における100シングルショットのリングダウン波形である。例えば、図8A及び8Bそれぞれのプロット810及び820におけるシングルショットのリングダウン波形(実際にはこの場合、逆リングアップ波形)を参照のこと。使用された特定のセットアップにおいて、レーザ源は、出力パワー又は波長いずれにおいても安定しなかった。レーザ源の当該キャビティに対するモードマッチングは、まったく最適とはいえないものであった。それゆえ、リングダウン波形には著しいノイズが予想され、これはプロット810及び820において明確に観測される。
ここに記載されるデジタル復調法は、鋭いオーバラップ吸収フィーチャを有する干渉種が不在の場合に、FTIRインターフェログラムを分析する代替的方法として用いることができる。その結果は、バックグラウンドスペクトルを有する比の取得必要性及びこれが導入するノイズを排除する近ゼロバックグラウンド測定である。
Claims (17)
- 時間領域信号の減衰定数を決定する方法であって、
混合器において、前記時間領域信号を、局所振動子が生成する局所振動子信号と混合し、前記局所振動子信号の基本周波数及び前記基本周波数以外の他の周波数における少なくとも2つのフーリエ変換時間領域信号を含むフーリエ変換時間領域信号を生成することと、
前記基本周波数及び前記他の周波数における前記少なくとも2つのフーリエ変換時間領域信号のそれぞれの大きさを決定することと、
前記基本周波数及び前記他の周波数における前記少なくとも2つのフーリエ変換時間領域信号の大きさとの比を決定すること
を含む方法。 - 前記基本周波数及び前記他の周波数とは異なる2つの周波数における前記少なくとも2つのフーリエ変換時間領域信号の大きさの比を決定することをさらに含む、請求項1に記載の方法。
- 前記少なくとも2つのフーリエ変換時間領域信号の周波数は、前記基本周波数の一以上の高調波周波数を含む、請求項1に記載の方法。
- 前記局所振動子は方形波局所振動子である、請求項1に記載の方法。
- 前記局所振動子信号は、複数の周波数成分を含む複合的波形である、請求項1に記載の方法。
- 時間領域信号の減衰定数を決定するシステムであって、
前記時間領域信号を局所振動子信号と混合し、前記局所振動子信号の基本周波数及び前記基本周波数以外の他の周波数における少なくとも2つのフーリエ変換時間領域信号を含むフーリエ変換時間領域信号を生成する混合信号を得る混合器と、
前記基本周波数及び前記他の周波数における前記少なくとも2つのフーリエ変換時間領域信号のそれぞれの大きさを決定する決定器と
を含み、
前記決定器はさらに、前記基本周波数及び前記他の周波数における前記少なくとも2つのフーリエ変換時間領域信号の大きさの比を決定するシステム。 - 前記時間領域信号は吸収度信号である、請求項6に記載のシステム。
- 前記時間領域信号はキャビティリングダウン信号である、請求項6に記載のシステム。
- 前記時間領域信号はインターフェログラム信号である、請求項6に記載のシステム。
- 連続波源、準連続波源、パルス源、及び変調源からなるグループから選択される励起源をさらに含む、請求項8に記載のシステム。
- 前記励起源はレーザ源である、請求項10に記載のシステム。
- 前記システムは、前記時間領域信号をリアルタイムで分析するべくフィールドプログラマブルゲートアレイを含むデジタルハードウェアによって構成される、請求項6に記載のシステム。
- 前記時間領域信号は吸収種に由来する、請求項6に記載のシステム。
- 変調信号及び前記局所振動子信号を生成する変調器と、
前記変調信号を使用して変調されるべく適合される光源と、
前記光源からの変調光と共振して吸収度信号を出力するべく適合される光キャビティと、
前記吸収度信号を検出して時間領域信号を生成する検出器と
をさらに含み、
前記決定器は、前記少なくとも2つのフーリエ変換時間領域信号の大きさの比を分析してサンプルの吸収度を決定する、請求項6に記載のシステム。 - 前記光キャビティは、吸収サンプルを、使用において共振する前記変調光の少なくとも一部を前記サンプルが吸収するように受け入れるべく適合される、請求項14に記載のシステム。
- 前記時間領域信号は吸収度信号である、請求項1に記載の方法。
- 前記時間領域信号はキャビティリングダウン信号である、請求項1に記載の方法。
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