JP6704833B2 - 位置検出方法及び光モジュール - Google Patents
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- G01D5/266—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light by interferometric means
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- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/45—Interferometric spectrometry
- G01J3/453—Interferometric spectrometry by correlation of the amplitudes
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N21/84—Systems specially adapted for particular applications
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- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/108—Beam splitting or combining systems for sampling a portion of a beam or combining a small beam in a larger one, e.g. wherein the area ratio or power ratio of the divided beams significantly differs from unity, without spectral selectivity
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- G01B2290/00—Aspects of interferometers not specifically covered by any group under G01B9/02
- G01B2290/15—Cat eye, i.e. reflection always parallel to incoming beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
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Description
Claims (9)
- 所定方向に沿って移動する可動部の位置を検出する位置検出方法であって、
前記可動部に設けられた可動ミラー、及び、位置が固定されたビームスプリッタを有する干渉光学系において、検出光が第1光と第2光とに分割される第1ステップと、
前記可動ミラー及び前記ビームスプリッタによって前記干渉光学系に形成された回帰光路に、前記第1光が入射する第2ステップと、
前記回帰光路において、前記第1光が前記可動ミラーを介して前記ビームスプリッタに至る度に、前記第1光の一部が前記ビームスプリッタを透過すると共に前記第1光の残部が前記ビームスプリッタで反射されて前記可動ミラーを介して前記ビームスプリッタに至る第3ステップと、
前記干渉光学系において、前記ビームスプリッタを透過した前記第1光と、前記第2光とが合成され、多重干渉光が生成される第4ステップと、
前記多重干渉光の第1干渉光信号から、前記検出光の波長の1/p(pは自然数)の波長を有する第2干渉光信号が抽出される第5ステップと、
前記第2干渉光信号に基づいて、前記所定方向における前記可動部の位置が算出される第6ステップと、を備える、位置検出方法。 - 前記第5ステップにおいては、
前記第1干渉光信号がフーリエ変換されることにより、前記検出光の波長の1/q(qは自然数)の各波長においてピークを有する光スペクトルが取得され、
いずれか1つの前記ピークについて前記光スペクトルが逆フーリエ変換されることにより、前記第2干渉光信号が取得される、請求項1に記載の位置検出方法。 - pは、2以上の整数である、請求項1又は2に記載の位置検出方法。
- 前記干渉光学系は、位置が固定された固定ミラーを更に有し、
前記回帰光路は、前記可動ミラー、前記ビームスプリッタ及び前記固定ミラーによって前記干渉光学系に形成され、前記回帰光路が位置する平面に垂直な方向から見た場合に矩形環状を呈している、請求項1〜3のいずれか一項に記載の位置検出方法。 - 前記第1ステップにおいては、前記ビームスプリッタによって前記検出光が前記第1光と前記第2光とに分割される、請求項1〜4のいずれか一項に記載の位置検出方法。
- 所定方向に沿って移動する可動部と、
前記可動部に設けられた可動ミラー、及び、位置が固定されたビームスプリッタを有する干渉光学系と、を備え、
前記干渉光学系には、前記可動ミラー及び前記ビームスプリッタによって回帰光路が形成されており、
前記干渉光学系は、
検出光が第1光と第2光とに分割され、且つ、
前記回帰光路に前記第1光が入射し、且つ、
前記回帰光路において、前記第1光が前記可動ミラーを介して前記ビームスプリッタに至る度に、前記第1光の一部が前記ビームスプリッタを透過すると共に前記第1光の残部が前記ビームスプリッタで反射されて前記可動ミラーを介して前記ビームスプリッタに至り、且つ、
前記ビームスプリッタを透過した前記第1光と、前記第2光とが合成され、多重干渉光が生成される、ように構成されている、光モジュール。 - 前記干渉光学系は、位置が固定された固定ミラーを更に有し、
前記回帰光路は、前記可動ミラー、前記ビームスプリッタ及び前記固定ミラーによって前記干渉光学系に形成され、前記回帰光路が位置する平面に垂直な方向から見た場合に矩形環状を呈している、請求項6に記載の光モジュール。 - 前記干渉光学系において、前記ビームスプリッタによって前記検出光が前記第1光と前記第2光とに分割される、請求項6又は7に記載の光モジュール。
- 前記可動部に設けられた測定用ミラーを有する測定用干渉光学系を更に備え、
前記測定用ミラーは、前記所定方向における前記可動部の一端部に設けられており、
前記可動ミラーは、前記所定方向における前記可動部の他端部に設けられている、請求項6〜8のいずれか一項に記載の光モジュール。
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LU92924B1 (de) * | 2015-12-23 | 2017-08-07 | Leica Microsystems | Abtastvorrichtung zum Abtasten eines Objekts für den Einsatz in einem Rastermikroskop |
JP6628622B2 (ja) * | 2016-02-02 | 2020-01-15 | 浜松ホトニクス株式会社 | 光モジュール |
CN109682830A (zh) * | 2018-11-27 | 2019-04-26 | 新野旭润光电科技有限公司 | 成像光学元件周边光亮检测装置 |
JP6688917B1 (ja) * | 2019-01-30 | 2020-04-28 | 浜松ホトニクス株式会社 | 光モジュール、信号処理システム及び信号処理方法 |
CN111351430B (zh) * | 2020-03-13 | 2021-12-03 | 大连理工大学 | 基于光束自动稳定的半导体激光运动误差测量系统及方法 |
CN111412832B (zh) * | 2020-03-13 | 2021-05-07 | 大连理工大学 | 基于干涉仪模块的半导体激光六自由度误差测量系统 |
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