JP6596636B2 - 流速分布計測方法及び粒径計測方法 - Google Patents
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Description
2 微細(トレーサ)粒子
3 分散媒
5 光学セル(カラム)
6 レーザー光照射部
8 撮像部
8a カメラ
10 解析部
21、31 セルブロック
Claims (10)
- 光学セルの流路内の流動場における流速分布の計測方法であって、
前記流路内に波長λのレーザー光を照射するレーザー光照射部と、前記レーザー光を照射された前記流路内を撮像するカメラと、時間間隔Δt毎に露光時間τで撮像された少なくとも複数の画像から前記流動場の流速分布を求める解析部と、を含む装置において、
前記流路内に前記レーザー光の前記波長λよりも小さい径のトレーサ粒子を与え、前記カメラで前記トレーサ粒子による光散乱の輝点を撮像し、
前記解析部は、前記輝点の移動から前記トレーサ粒子のそれぞれの移動量を得て、前記移動量のばらつきの平均値とブラウン運動の相関からブラウン運動成分を補正し前記流速分布を求めることを特徴とする流速分布計測方法。 - 前記平均値は、アンサンブル平均、又は時間平均によることを特徴とする請求項1記載の流速分布計測方法。
- 前記レーザー光照射部は前記流路内に光束を絞って前記レーザー光を照射するとともに、前記カメラは前記光束内の前記トレーサ粒子からの前記輝点を撮像することを特徴とする請求項1記載の流速分布計測方法。
- 前記流路は横幅に対する厚さを小さくするよう、前記カメラの撮像軸方向に沿って対向する一対の板状体の間隙に設けられていることを特徴とする請求項3記載の流速分布計測方法。
- 前記トレーサ粒子の粒径は10nmから1μmであることを特徴とする請求項1記載の流速分布計測方法。
- 光学セルの流路内の流動場でブラウン運動する計測対象粒子の粒径を計測する計測方法であって、
前記流路内に波長λのレーザー光を照射するレーザー光照射部と、前記レーザー光を照射された前記流路内を撮像するカメラと、時間間隔Δt毎に露光時間τで撮像された少なくとも複数の画像から前記流動場の流速分布を求め且つ前記計測対象粒子の粒径を求める解析部と、を含む装置において、
前記流路内に前記レーザー光の前記波長λよりも小さい径のトレーサ粒子を与え前記カメラで前記トレーサ粒子による光散乱の輝点を撮像し、前記解析部において、前記輝点の移動から前記トレーサ粒子のそれぞれの移動量を得て、前記移動量のばらつきの平均値とブラウン運動の相関からブラウン運動成分を補正し前記流速分布を求め、且つ、
前記流路内に前記計測対象粒子を与え前記カメラでこれを撮像し、前記解析部において、前記計測対象粒子の変位から前記流速分布による前記流動場の移動成分を除いた補正変位を得て、前記計測対象粒子の前記粒径を与えることを特徴とする粒径計測方法。 - 前記トレーサ粒子及び前記計測対象粒子は同一であって単一の工程で撮像することを特徴とする請求項6記載の粒径計測方法。
- 前記トレーサ粒子及び前記計測対象粒子は10nmから1μmの範囲内の粒径であることを特徴とする請求項7記載の粒径計測方法。
- 前記計測対象粒子の前記粒径をdとし、kBをボルツマン定数、Tを絶対温度、ηを前記流動場の分散媒における粘性係数として、前記計測対象粒子の前記補正変位の2乗平均値がkBT/3πηdに比例することから前記粒径であるdを算出することを特徴とする請求項8記載の粒径計測方法。
- 前記計測対象粒子の撮像の露光時間を前記計測対象粒子の計測粒径範囲に基づいて変化させることを特徴とする請求項9記載の粒径計測方法。
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