Nitric oxide flow tagging in unseeded air
Related Experiment Video
Updated: Jul 9, 2026

A Novel Inhalation Mask System to Deliver High Concentrations of Nitric Oxide Gas in Spontaneously Breathing Subjects
Published on: May 4, 2021
Abstract:
A scheme for molecular tagging velocimetry is presented that can be used in air flows without any kind of seeding. The method is based on the local and instantaneous creation of nitric oxide (NO) molecules from N(2) and O(2) in the waist region of a focused ArF excimer laser beam. This NO distribution is advected by the flow and can be visualized any time later by laser-induced fluorescence in the gamma bands. The creation of NO is confirmed by use of an excitation spectrum. Two examples of the application of the new scheme for air-flow velocimetry are given in which single laser pulses are used for creation and visualization of NO.
Related Concept Videos
Nitric Oxide Signaling Pathway
General External Flow Characteristics
Steady, Laminar Flow in Circular Tubes
Rapidly Varying Flow
Laminar Flow
