JP4376778B2 - テラヘルツ画像処理装置およびテラヘルツ画像処理方法 - Google Patents
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Description
画像を得ることによって、画像処理技術を、多数の画像及び多数のTHz源に適用することができるため、完全なシステムでは、ノイズを除去して、誤警報を減らすことができる。
波のための高速光混合デバイスは、最適な中間周波数において作動するようにデザインすることが好ましい。光混合デバイスは、源及び検出器の両方として機能することができる。標的爆発物に対して必要な、THz周波数スペクトルの特徴のデータベースを提供し、これをシステムと共に用いる。また、THz画像から選択爆発物を識別するために、ニューラルネットワーク・アルゴリズムを連結的に用いることができる。
広い領域の遠隔視検のための50mの距離では、1cm基線アレイは1.5mの空間分解能を持ち、10cm基線アレイは約15cmの空間分解能を持つ。
線の周りに円錐を構成するすべての方向は、同じ位相遅延τg=(b・sinα)/cを持つ。ここで、bは基線の長さであり、cは光速であり、そしてαは相対角度である。源の正確な方向を決定するためには、基線の他の方位における追加の測定を行わなくてはならない。
である。ここで、Aは入射THz平面波の振幅であり、kは入射電磁波の波数であり、Bは検出器対間の間隔であり、そしてαは、図2内に定義する、検出器に対して入射波面が作る角度である。0.5THzの周波数に対する予想実験データのプロットを、図3Bに示す。異なる検出器対のフーリエ成分を含むと、結果として生じる画像は、点THz源の点分布関数に接近する。点分布関数は、例えば、THz干渉計画像を清浄にする、また干渉計画像内のサイドローブ・アーティファクトを取り除くために用いることができる。
d=arob(n−1)
System with Artificial Neural Networks and FT-IR Spectra for the Identification
of Bacteria,"Applied Spectroscopy, 54, no. 10, p.1471(2000))。同様に、ANNを使用して、低SN比のラマン・スペクトルから、高精度で多種類の、塩素処理した炭化水素の混合物内の個々の有機成分を識別した。「分光分析法とハイブリッド・ニューラルネットワーク分析」(T. Lu and J. Lerner, "Spectroscopy and Hybrid Neural Network Analysis,"
Proc. IEEE, 84, no. 6, p.895(1996))。同様に、DNAの異なるセットを識別するために、分析ツールとしてのTHzスペクトルと共にニューラルネットワークの原理を用いた。「DNA高分子の準ミリ波振動分光分析法へのニューラルネットワーク分析の応用」(T. Globus, et. al "Application of Neural Network Analysis to Submillimeter-wave
vibrational spectroscopy of DNA macromoledules", in the Proceedings to the
2001 ISSSR, June 12-15, Quebec City, Canada(2001))。本発明においては、誤り検出率を減少させるために、異なる時に、あるいは異なる空間分解能で撮影した結合画像を分析するのに、疑似ニューラルネットワークを用いることができる。
Claims (24)
- 特定な成分の存在を判定するために、関心領域を検査するためのテラヘルツ画像処理装置であって、
(a)前記検査に適した、0.1から10テラヘルツ(THz)の周波数の電磁放射を発生させるための手段、
(b)前記関心領域に入射する前記周波数の放射を提供するための手段、
(c)前記関心領域から反射した又は前記関心領域を透過した前記周波数の放射を、前記関心領域から間隔を置いた検出器平面内の複数の点において同時に検出するために間隔を有して配置された複数の検出器から構成される干渉法によるアレイを含む検出器手段、そして
(d)前記特定な成分の存在を確定可能なよう、前記検出した前記周波数の放射を前記関心領域の画像へ変換するための手段からなる、テラヘルツ画像処理装置。 - 前記(c)の干渉法によるアレイの複数の検出器が、非周期的パターンに配置された、請求項1に記載の装置。
- 複数の検出器から構成される干渉法によるアレイの前記検出器手段における、非周期的パターンに配置された前記検出器の間隔は、任意の1対の検出器間の距離によって形成されるベクトルが、他の1対の検出器間の距離によって形成されるベクトルと同一ではないような間隔であることを含む、請求項2に記載の装置。
- 複数の検出器から構成される干渉法によるアレイの前記検出器手段における、非周期的パターンに配置された前記検出器は、対数周期間隔に配置される請求項2または3に記載の装置。
- 相関位相と振幅成分とからフーリエ変換再生像を生成するために前記複数の検出器対からの信号出力を合成する手段を含む、請求項1から4のいずれかに記載の装置
- 前記検出器アレイが、複数の半導体光ミキサーからなり、さらに光ミキサー駆動手段を含む、請求項5に記載の装置。
- 前記光ミキサー駆動手段が、普通の光ファイバ・コネクタによって前記光ミキサーに結合した、周波数安定化チューナブル光ヘテロダイン源からなる、請求項6に記載の装置。
- 前記検出器アレイが、一列配置の検出器からなる、請求項5に記載の装置。
- さらに、前記アレイを固定軸の回りに回転させるための手段を含む、請求項8に記載の装置。
- さらに、前記フーリエ成分のフーリエ逆変換によって、前記関心領域における本来の輝度分布を合成するための手段を含む、請求項5に記載の装置。
- さらに、前記フーリエ成分のフーリエ逆変換によって、前記関心領域における本来の輝度分布を合成するための手段を含む、請求項6に記載の装置。
- 前記光ミキサーが光導電デバイスであり、光ミキサーの各対の前記駆動手段が、前記光ミキサーにゲートを付ける差周波数を持つ一対のレーザからなり、前記一対の光ミキサーの各メンバーにおける入射テラヘルツ放射が、前記差周波数にミキシングされて、中間周波数で修正信号アウトプットが提供されることによって、信号処理が促進する、請求項6に記載の装置。
- さらに、前記特定な成分の存在を判定するために、画像処理した関心領域の部分を判定標準に比較するための画像分析手段を含む、請求項10に記載の装置。
- さらに、前記特定な成分の存在を判定するために、画像処理した関心領域の部分を判定標準に比較するための画像分析手段を含む、請求項11に記載の装置。
- 前記分析手段が、爆発性成分に対応する判定標準に、前記部分を比較する、請求項10または11に記載の装置。
- 前記分析手段が、生物兵器に対応する判定標準に、前記部分を比較する、請求項10または11に記載の装置。
- 特定な成分の存在を判定するために、関心領域を検査するためのテラヘルツ画像処理方法であって、
(a)前記検査に適した、0.1から10テラヘルツ(THz)の周波数の電磁放射を発生させること、
(b)前記関心領域に入射する前記周波数の放射を提供すること、
(c)前記関心領域から反射した又は前記関心領域を透過した前記周波数の放射を、前記関心領域から間隔を置いた検出器平面内の複数の点において、間隔を有して配置される複数の検出器から構成される干渉法によるアレイにより、同時に検出すること、そして
(d)前記特定な成分の存在が確定可能なよう、前記検出した前記周波数の放射を前記関心領域の画像へ変換することからなる、テラヘルツ画像処理方法。 - ステップ(c)が、非周期的パターンに配置された複数の検出器を含んで構成される干渉法によるアレイによって検出される、請求項17に記載の方法。
- ステップ(c)において、複数の検出器から構成される干渉法によるアレイの前記検出器手段における非周期的パターンに配置される前記検出器の間隔は、任意の1対の検出器間の距離によって形成されるベクトルが、他の1対の検出器間の距離によって形成されるベクトルと同一ではないような間隔である、請求項18に記載の方法。
- ステップ(c)において、非周期的パターンに配置された前記複数検出器の間隔は、対数周期間隔に配置される複数の検出器から構成される干渉法によるアレイによって検出される、請求項18または19に記載の方法。
- 前記検出器の対からの信号出力が、フーリエ変換再生像を得るために相関位相と振幅成分とから合成される、請求項17から20までのいずれかに記載の方法。
- 前記関心領域における本来の輝度分布が、前記フーリエ成分のフーリエ逆変換によって合
成される、請求項21に記載の方法。 - 前記関心領域が爆発性成分を含む、請求項22に記載の方法。
- 前記関心領域が生物兵器を含む、請求項22に記載の方法。
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