Photonic Analyses for High Knudsen Number Flows(<Special Issue>The 1st Symposium on Micro-Nano Engineering)

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  • NIIMI Tomohide
    Department of Micro-Nano Systems Engineering, Nagoya University

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  • 高クヌッセン数流れの光計測(<小特集>第1回マイクロ・ナノ工学シンポジウム)
  • 高クヌッセン数流れの光計測
  • コウクヌッセンスウ ナガレ ノ ヒカリ ケイソク

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Abstract

Recently, the necessity of high Knudsen number flows, such as highly rarefied gas flows with large mean free path and gaseous flows around nanodevices with small characteristic length have increased significantly. In this paper, we describe mainly the optical diagnostic techniques for the high Knudsen number flows, such as laser induced fluorescence (LIF), resonantly enhanced multi-photon ionization (REMPI) and pressure sensitive molecular film (PSMF), and our experimental results obtained by the use of the techniques, i.e., applications of LIF to visualization of flow field structures including complicated shock wave system and to a measurement of rotational temperature, establishment of a REMPI system and its application to detection of rotational nonequilibrium in highly rarefied gas flows, and development of the suitable PSMF for low density and micro-scale gas flows.

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