Related Experiment Video
Updated: Jun 20, 2026
08:25
Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
Published on: April 30, 2018
Planar temperature measurement in compressible flows using laser-induced iodine fluorescence
Optics Letters
|September 24, 2009
Summary
This study introduces a laser-induced iodine fluorescence method for measuring temperature in cold, compressible air flows. The technique accurately maps temperature distributions in complex, low-temperature environments.
Area of Science:
- Aerospace Engineering
- Optical Diagnostics
- Fluid Dynamics
Background:
- Accurate temperature measurement is crucial for understanding compressible fluid flows.
- Existing methods face challenges in low-temperature, three-dimensional, and nonreacting flow fields.
- Laser-induced fluorescence (LIF) offers a non-intrusive diagnostic approach.
Purpose of the Study:
- To investigate and demonstrate a laser-induced iodine fluorescence (LIIF) technique for planar temperature measurements.
- To assess the suitability of LIIF for cold, nonreacting, compressible air flows.
- To enable spatially resolved temperature surveys in complex flow environments.
Main Methods:
- Analytical investigation of the LIIF technique.
- Experimental demonstration in a calibrated flow field.
- Utilizing the temperature-dependent broadband fluorescence of iodine excited by an argon-ion laser (514 nm).
Main Results:
- Successful planar temperature measurements were achieved in a known flow field.
- Temperatures ranging from 165 K to 245 K were accurately measured.
- The LIIF technique proved effective for low-temperature compressible flows.
Conclusions:
- The laser-induced iodine fluorescence technique is a viable method for planar temperature mapping.
- This technique facilitates practical, spatially resolved temperature surveys in complex, low-temperature compressible flows.
- It offers a valuable tool for aerodynamic research and flow diagnostics.
Related Concept Videos
01:16Flame Photometry: Lab
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
01:02Flame Photometry: Overview
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...