Browse Prior Art Database

Flow-Visualization Technique Combining the Laser-Induced Fluorescence and Dissociation of Iodine MOLECULES in Air Flows

IP.com Disclosure Number: IPCOM000038508D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31

Publishing Venue

IBM

Related People

Authors:
Tzeng, HM [+details]

Abstract

Iodine molecules have high vapor pressure (25 mTorrs) at room temperature. This property, when combined with the strong fluorescence, makes iodine molecules ideal for air flow visualization. The 488 nm (>499 nm) and the 514.5 nm (<499 nm) emissions of the argon-ion laser are utilized to initiate dissociation and induce fluorescence, respectively. Specifically, the 488 nm emission dissociates the iodine molecules into iodine ATOMS in a localized area and the 514.5 nm emission induces fluorescence from the remaining iodine MOLECULES in the flow. The flow field is visualized from monitoring the motion of these iodine atoms. An arrangement implementing the above-mentioned principle is shown in the figure. Seeding of the flow with iodine molecules is readily achieved by passing the air through an iodine crystal reservoir.