JP2012047739A - コーティングを評価するための熱画像化方法および装置 - Google Patents
コーティングを評価するための熱画像化方法および装置 Download PDFInfo
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
- G01B21/085—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness using thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
- G01B11/0658—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating with measurement of emissivity or reradiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0088—Radiation pyrometry, e.g. infrared or optical thermometry in turbines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Radiation Pyrometers (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
【解決手段】コーティング表面において熱パルスを発生させることができるフラッシュランプ光源11と、コーティング表面の連続画像フレームをキャプチャすることができる画像キャプチャ13および処理装置16とを部分的に使用する、基材表面上のコーティング4の不定の厚さを求めるための装置を提供し、各連続画像フレームは経過時間に対応し、ピクセルアレイを含み、そのアレイの各ピクセルはコーティング表面上の位置に対応する。コーティング4の厚さを計算する方法も提供する。
【選択図】図1
Description
4 コーティング
10 装置(全体)
11 フラッシュランプ
13 IRアレイカメラ
14 制御電子回路
15 メモリ
16 プロセッサ
17 表示モニタ
Claims (10)
- 基材(1)上に塗布されるコーティング(4)の不定の厚さを求めるための装置であって、
前記コーティング表面において熱パルスを発生させることができるフラッシュランプ光源(11)と、
前記フラッシュランプ光源に結合され、前記フラッシュランプの発光を開始することができる光トリガと、
前記フラッシュランプ光源に結合され、前記熱パルスを冷却することができるトランジスタと、
前記フラッシュランプからの余熱が前記コーティング表面を加熱することを防ぐことができる、前記フラッシュランプ光源(11)と前記コーティング表面(4)との間に位置する反射フィルタ(18)と、
前記コーティング表面の連続画像フレームをキャプチャするように配置されるIR画像キャプチャ装置(13)であって、各連続画像フレームが経過時間に対応し、ピクセルアレイを含み、前記アレイの各ピクセルが前記コーティング表面上の位置に対応する、IR画像キャプチャ装置(13)と、
前記光トリガおよびトランジスタの動作を制御し、
前記フラッシュランプの発光開始時におよびその後逐次的に前記コーティング表面の前記画像フレームを受け取り、
前記連続画像フレームを部分的に使用し時間−温度応答を計算して、前記基材(1)に沿った様々な点における前記コーティングの前記厚さを求める
ことができる、前記IR画像キャプチャ装置に結合されるプロセッサ(16)と
を備える装置。 - 前記反射フィルタが、前記フラッシュランプ光源上に直接コーティングされ、3〜5ミクロン範囲の放射を反射することができる、請求項1記載の装置。
- 前記プロセッサが、前記時間−温度応答から、変曲点の値およびデルタログを計算するように構成される、請求項1記載の装置。
- 基材の表面に沿った様々な点におけるコーティングの厚さを求めるための方法であって、
フラッシュランプからの余熱が前記コーティング表面を加熱することを防ぐための反射フィルタを備えるフラッシュランプ光源を使用し、前記コーティング表面において短期間の熱パルスを発生させるステップと、
IRキャプチャ装置を使用して前記コーティング表面の連続画像フレームをキャプチャするステップであって、各連続画像フレームが経過時間に対応し、ピクセルアレイを含み、前記アレイの各ピクセルが前記コーティング表面上の位置に対応する、ステップと、
前記連続画像フレームを保存するために、プロセッサを使用して前記連続画像フレームを処理するステップと、
前記ピクセルアレイの2個以上のピクセルについて時間−温度応答曲線を独立して計算するための前記連続画像フレームを構成する基材に沿った前記コーティングの前記厚さおよび熱伝導率を求めるステップとを含む
方法。 - 前記時間−温度応答曲線上の最大勾配の時点が、変曲点時間(t inflection)として定義され、前記時間−温度応答曲線の等式が、
Rは、
次式で定義されるように、Ecは前記コーティングの浸透率であり、Esは、
請求項4記載の方法。 - 前記変曲点時間(t inflection)が、前記時間−温度応答曲線から実験的に測定され、Rが前記コーティングおよび基材の材料特性から求められる、請求項5記載の方法。
- コーティング厚さのばらつきを求めるステップが、前記ピクセルアレイの2個以上のピクセルにおいてLの値を計算するステップを含み、Lは、
τcは、
qは、
- 前記時間−温度応答曲線を生成するために、ガウス関数による前記連続画像フレームデータの時間平滑化を使用する、請求項4記載の方法。
- 前記連続画像フレームデータに画像化フィルタを適用し、前記画像化フィルタが、空間平滑化、初期/終了雑音抑圧、ネガティブコントラスト抑圧、コントラスト閾値処理、およびそれらの組合せを含む、請求項8記載の方法。
- 前記基材に沿った前記コーティングの厚さについての色分けされた画像、またはグレースケールで表現された画像を表示するステップをさらに含む、請求項4記載の方法。
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US12/869,893 US8692887B2 (en) | 2010-08-27 | 2010-08-27 | Thermal imaging method and apparatus for evaluating coatings |
US12/869,893 | 2010-08-27 |
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JP2012047739A true JP2012047739A (ja) | 2012-03-08 |
JP2012047739A5 JP2012047739A5 (ja) | 2014-10-02 |
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US (1) | US8692887B2 (ja) |
EP (1) | EP2423638A2 (ja) |
JP (1) | JP2012047739A (ja) |
CN (1) | CN102445155A (ja) |
BR (1) | BRPI1103714A2 (ja) |
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US20120050537A1 (en) | 2012-03-01 |
CN102445155A (zh) | 2012-05-09 |
EP2423638A2 (en) | 2012-02-29 |
BRPI1103714A2 (pt) | 2013-01-22 |
US8692887B2 (en) | 2014-04-08 |
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