JP2016101519A - 媒質に照射を行うシステムおよびその制御方法 - Google Patents
媒質に照射を行うシステムおよびその制御方法 Download PDFInfo
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Abstract
Description
式中、Γはグリュナイゼン係数(熱-音響変換効率)である。
式中、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且つNは位相シフト方法の測定回数である。CCD612はローパスフィルタとして作用するので、主に周波数シフト光619と参照光617との間の干渉像の成分が干渉縞を生成し、この成分は時間の経過に伴ってゆっくりと変化するため、CCD612が干渉像(デジタルホログラム)を効率よく検出できる。
本発明の第2の側面のシステムの制御方法は、媒質中の任意の位置を設定する工程と、前記任意の位置で光の周波数を変調させて変調光を発生させる工程と、前記変調光の位相分布を取得する取得する工程と、前記位相分布に基づいて前記媒質に再構成光を照射する工程と、を有する。
Claims (33)
- 電磁波を放射する電磁波源を含み、媒質中で散乱される前記電磁波を前記媒質に照射する第1の照射ユニットと、
前記媒質中のある特定位置で前記電磁波の周波数を変調するために前記媒質へ超音波を送信する超音波装置と、
前記変調された電磁波と参照波との間の干渉により生成される干渉パターンに対応する情報を記録するために参照波をホログラフィック材料に照射する第2の照射ユニットとを備え、
前記第1の照射ユニットは、前記情報が前記ホログラフィック材料に記録された後、前記媒質中の前記位置で前記媒質に照射される再構成波を前記ホログラフィック材料が発生するように、前記ホログラフィック材料に照射を行うように構成されることを特徴とする装置。 - 前記再構成波は、前記媒質中の前記位置に向かって進む位相共役波であることを特徴とする請求項1記載の装置。
- 前記ホログラフィック材料は、前記再構成波を生成するように、前記参照波の方向に対して実質的に逆の方向から照射がなされることを特徴とする請求項1記載の装置。
- 前記再構成波の強度が前記変調された電磁波を得るために使用される前記電磁波の強度とは異なるように前記再構成波の強度を制御するコントローラを更に備えることを特徴とする請求項1記載の装置。
- 前記電磁波源は可視光線又は近赤外線を発生することを特徴とする請求項1記載の装置。
- 前記ホログラフィック材料をモニタする光検出器を更に備えることを特徴とする請求項1記載の装置。
- 前記再構成波による前記媒質の照射に応答して前記媒質から出力される信号を検出する光検出器を更に備えることを特徴とする請求項1記載の装置。
- 前記再構成波による前記媒質の照射に応答して前記媒質から出力される信号を検出する超音波検出器を更に備えることを特徴とする請求項1記載の装置。
- 前記第1の照射ユニットは、前記ホログラフィック材料にパルス波を照射することを特徴とする請求項8記載の装置。
- 前記再構成波による前記媒質の照射に応答して前記媒質から出力される信号を使用して断層撮影画像を形成する画像形成ユニットを更に備えることを特徴とする請求項1記載の装置。
- 媒質中で散乱される電磁波を媒質に照射するための第1の電磁波源を含む第1の照射ユニットと、
前記媒質中のある特定位置で前記電磁波の周波数を変調するために前記媒質に向かって超音波を送信する超音波装置と、
前記変調された電磁波と参照波との間の干渉により生成される干渉パターンに対応する情報を記録するために参照波をホログラフィック材料に照射する第2の照射ユニットと、
前記ホログラフィック材料が前記媒質中の前記位置で前記媒質に照射される再構成波を発生するように、前記ホログラフィック材料に照射を行うための第2の電磁波源を含む第3の照射ユニットと、
を備えることを特徴とする装置。 - 前記再構成波は、前記媒質中の前記位置へ進む位相共役波であることを特徴とする請求項11記載の装置。
- 前記ホログラフィック材料は、前記第3の照射ユニットにより前記参照波の方向に対して実質的に逆の方向から、照射がなされることを特徴とする請求項11記載の装置。
- 前記再構成波の強度が前記変調された電磁波を得るために使用される前記電磁波の強度とは異なるように前記再構成波の強度を制御するコントローラを更に備えることを特徴とする請求項11記載の装置。
- 前記第1の照射ユニットは、可視光線又は近赤外線を発生する電磁波源であることを特徴とする請求項11記載の装置。
- 前記ホログラフィック材料をモニタする光検出器を更に備えることを特徴とする請求項11記載の装置。
- 前記再構成波による前記媒質の照射に応答して前記媒質から出力される信号を検出する検出器を更に備えることを特徴とする請求項11記載の装置。
- 前記再構成波による前記媒質の照射に応答して前記媒質から出力される信号を使用して断層撮影画像を形成する画像形成ユニットを更に備えることを特徴とする請求項11記載の装置。
- 媒質に照射を行う方法であって、
媒質中で散乱され且つ前記媒質中のある特定位置で周波数変調される電磁波を前記媒質に照射することと、
前記変調された電磁波と参照波との間の干渉により生成される干渉パターンに対応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、前記媒質を照射する位相共役波を発生することと、
を備えることを特徴とする方法。 - 前記再構成波の強度は、前記変調された電磁波を得るために使用される前記電磁波の強度とは異なることを特徴とする請求項19記載の方法。
- 前記電磁波の周波数は超音波により変調されることを特徴とする請求項19記載の方法。
- 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19記載の方法。
- 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19記載の方法。
- 前記情報は、ホログラフィック材料を使用することにより取得されることを特徴とする請求項19記載の方法。
- 前記情報は、デジタルホログラフィ技術を使用することにより取得されることを特徴とする請求項19記載の方法。
- 前記位相共役波による前記媒質の照射に応答して前記媒質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備えることを特徴とする請求項19記載の方法。
- 前記情報が記録されている間に前記ホログラフィック材料をモニタすることを更に備えることを特徴とする請求項24記載の方法。
- 前記媒質中の前記位置を深くしていくことを更に備えることを特徴とする請求項19記載の方法。
- 電磁波を放射する電磁波源を含み、媒質中で散乱される前記電磁波を前記媒質に照射する照射装置と、
前記媒質中のある特定位置で前記電磁波の周波数を変調する変調器と、
前記変調された電磁波と参照波との間の干渉により生成される干渉パターンに対応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、前記媒質に照射される位相共役波を発生する発生器と、
を備えることを特徴とする装置。 - 前記変調器は超音波装置を備えることを特徴とする請求項29記載の装置。
- 前記検出器はCCDセンサ又はCMOSセンサを備えることを特徴とする請求項29記載の装置。
- 前記発生器は、前記位相共役波を形成する空間光変調器を備えることを特徴とする請求項29記載の装置。
- 前記装置は、音響光学イメージングシステムを光音響イメージングシステムと組み合わせるように構成されることを特徴とする請求項29記載の装置。
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