A Discrimination Method for a Pierced Position by Detecting a Pre-signal in Bubble Measurement Through a Single-Tip Optical Fiber Probe
Bibliographic Information
- Other Title
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- 単一光ファイバープローブによる気泡計測時の プレシグナル検知による接触位置判定法
- タンイツ ヒカリ ファイバープローブ ニ ヨル キホウ ケイソクジ ノ プレシグナル ケンチ ニ ヨル セッショク イチ ハンテイホウ
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Description
We have already developed a Single-Tip Optical fiber Probe (S-TOP): an efficient measurement technique for a velocity and diameter of a bubble or droplet. The objective of the present study is to improve the measurement accuracy of the S-TOP. We use a pre-signal to rationally correct the S-TOP measurement error owing to a random position penetrated by the S-TOP on the bubble surface. Hidden potentials of the pre-signal were revealed through a 3D numerical simulation based on a ray tracing method. The simulator can evaluate the complicated optical signals of the S-TOP by computing the polarization and energy of every incident ray. Based on the numerically simulated result corresponding to the single-bubble measurement, we clarified that the pre-signal was caused by light reflection at the bubble frontal surface. Furthermore, the characteristics of the pre-signal were quantified; the pre-signal intensively appears just before the S-TOP touches the bubble’s central region. Using these characteristic phenomena, we can easily detect the touched position (pre-signal threshold method). This method enables us to achieve an accurate measurement in a bubbly flow. The measured chord lengths via the S-TOP were compared with the lengths of the bubble minor axis obtained from visualization. In consequence, a difference of the results between the pierced chord length and the bubble minor axis was considerably decreased.
Journal
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- Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers
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Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers 30 (1), 21-29, 2013
Japan Society of Refrigerating and Air Conditioning Engineers
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Details 詳細情報について
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- CRID
- 1390282679643685120
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- NII Article ID
- 10031165696
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- NII Book ID
- AA11125910
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- ISSN
- 2185789X
- 13444905
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- NDL BIB ID
- 024618050
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed