JP2013545111A - 媒体を照射する装置及び方法 - Google Patents
媒体を照射する装置及び方法 Download PDFInfo
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Abstract
【選択図】図7
Description
P=ΓμaΦ (1)
式において、Γは、グリュンアイゼン係数(熱−音響変換効率)である。
fR=fU+fA+fC/N (2)
式において、fUは、非シフト光の周波数であり、fAは、超音波の周波数であり、fCは、CCD612のフレームレートであり、Nは、位相シフト方法における測定回数である。CCD612はローパスフィルタとして作用するため、主に、周波数シフト光619と参照光束617との干渉による干渉像の成分は、時間の経過に伴ってゆっくり変化する干渉縞を含み、そのため、CCD612は干渉像(デジタルホログラム)を効率よく検出することができる。
周波数シフト光と参照光との干渉による干渉パターン(ホログラム)を、CCD又はCMOSなどのアレイセンサによって記録するためにデジタルホログラフィ技術が使用される場合、センサのダイナミックレンジは、重要な要因の1つである。バックグランドノイズが非常に大きい場合、バックグランドノイズによってセンサのダイナミックレンジが縮小されてしまう。従って、散乱媒体の内部に光を集束させるために、信号光の位相共役を生成するように効率よくホログラムを取得するためには、非周波数シフト光であるバックグランドノイズを阻止するか、或いは、減少させることが望ましい。
図2の超音波焦点ボリューム208の特性(例えば、体積、形状、位置)は、超音波装置207及びその制御部(不図示)を動作させることによって調整される。超音波焦点ボリューム208の形状は、線状又は層であってもよい。
上述したように、図1Cの周波数シフト光105の位相共役は、記録処理において、超音波が集束された散乱媒体101の局所的なボリューム102まで元の光路を辿って戻る。
散乱媒体を通して見る(シースルー)ために、又は散乱媒体の内部に光を集束させるために位相共役波を利用する方法に関して、散乱体の運動は、重要な要因の1つであると考えられる。上述した技術は、記録ステップ及び再構成(照射)ステップを含む処理を通して散乱体が動かないという仮定に基づいている。
図2A及び図2Bに示すように、音響光学変調器(AOM)202及び204などの外部変調器は、それらの変調器の周波数の差が超音波システム207に印加される周波数とほぼ等しくなるように調整される周波数のクロックによって、個別に駆動される。
Claims (12)
- 媒体を照射する方法であって、
電磁波によって媒体を照射することと、
前記媒体の位置で前記電磁波を周波数変調することと、
アパーチャを通過する前記変調された電磁波と参照波との干渉によって生成される干渉パターンに関する情報を取得することと、
前記取得された情報に基づいて前記媒体を照射するための位相共役波を生成することと、
を備えることを特徴とする方法。 - 前記電磁波の周波数は、超音波によって変調されることを特徴とする請求項1に記載の媒体を照射する方法。
- 前記変調された電磁波の周波数は、前記参照波の周波数と等しいことを特徴とする請求項1に記載の媒体を照射する方法。
- 前記電磁波の波長は、380nm〜2500nmの範囲であることを特徴とする請求項1に記載の媒体を照射する方法。
- 前記アパーチャ及びレンズユニットを使用することによって焦点を設定することを更に含むことを特徴とする請求項1に記載の媒体を照射する方法。
- 前記位相共役波による照射に応じて前記媒体から出力される信号を検出することと、
前記検出された信号を使用して断層撮影画像を形成することと、
を更に含むことを特徴とする請求項1に記載の媒体を照射する方法。 - 装置であって、
媒体を照射するための電磁波を放射する光源と、
超音波トランスデューサによって特定される前記媒体の位置で前記電磁波を周波数変調する変調器と、
前記媒体から射出する光を選択するアパーチャと、
前記アパーチャを通過する前記変調された電磁波と参照波との干渉によって生成される干渉パターンに関する情報を取得する検出器と、
前記取得された情報に基づいて前記媒体を照射するための位相共役波を生成する生成器と、
を備えることを特徴とする装置。 - 前記生成器は、空間光変調器を含むことを特徴とする請求項7に記載の装置。
- 媒体を照射する方法であって、
電磁波によって媒体を照射することと、
前記媒体の複数の位置で前記電磁波をそれぞれ異なる周波数によって周波数変調することと、
前記変調された電磁波と参照波との干渉によって生成される干渉パターンに関する情報を取得することと、
前記取得された情報に基づいて前記媒体を照射する位相共役波を生成することと、
を備えることを特徴とする方法。 - 媒体を照射する方法であって、
電磁波によって媒体を照射することと、
前記媒体の位置で前記電磁波を周波数変調することと、
前記変調された電磁波と参照波との干渉によって生成される干渉パターンに関する情報を取得することと、
前記取得された情報に基づいて前記媒体を照射するための位相共役波を生成することと、
前記位相共役波による照射に応じて前記媒体から発生される信号を検出することと、
を備えることを特徴とする方法。 - 前記信号の変化に関する情報を表示することを更に含むことを特徴とする請求項10に記載の方法。
- 媒体を照射する方法であって、
電磁波によって媒体を照射することと、
前記媒体の位置で前記電磁波が周波数変調され、前記媒体の前記位置以外の領域で前記電磁波が変調されないように、前記媒体の前記位置で前記電磁波を周波数変調することと、
前記媒体からの周波数変調されていない電磁波と参照波との干渉によって生成される干渉パターンに関する情報を取得することと、
前記取得された情報に基づいて照射するための位相共役波を生成することと、
を備えることを特徴とする方法。
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US201061424553P | 2010-12-17 | 2010-12-17 | |
US61/424,553 | 2010-12-17 | ||
US13/327,581 US8954130B2 (en) | 2010-12-17 | 2011-12-15 | Apparatus and method for irradiating a medium |
US13/327,581 | 2011-12-15 | ||
PCT/IB2011/003236 WO2012080837A2 (en) | 2010-12-17 | 2011-12-16 | Apparatus and method for irradiating a medium |
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JP2017520801A (ja) * | 2014-07-14 | 2017-07-27 | ブルッカー、ゲーリー | 物体の単一面のホログラフィック撮像のシステム及び方法 |
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US8954130B2 (en) | 2015-02-10 |
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