Spatially-resolved atomic oxygen absorption and emission measurements in the Hypersonic Materials Environmental Test System

IF 2 3区物理与天体物理 Q3 OPTICS

Applied Physics B Pub Date : 2025-05-09 DOI:10.1007/s00340-025-08476-1

Tal Schwartz, Scott C. Splinter, Neil S. Rodrigues, Paul M. Danehy, Killian E. Samuels, Christopher B. Kostyk, Ronald K. Hanson

{"title":"Spatially-resolved atomic oxygen absorption and emission measurements in the Hypersonic Materials Environmental Test System","authors":"Tal Schwartz, Scott C. Splinter, Neil S. Rodrigues, Paul M. Danehy, Killian E. Samuels, Christopher B. Kostyk, Ronald K. Hanson","doi":"10.1007/s00340-025-08476-1","DOIUrl":null,"url":null,"abstract":"<div><p>A tunable diode laser absorption spectroscopy sensor and a high-speed camera measuring narrow-band emission are deployed at the NASA Langley Hypersonic Materials Environmental Test System, a hypervelocity arc-heated tunnel. Both sensors target electronically-excited atomic oxygen. The sensors are used in conjunction to measure bulk translational temperatures (from 500 to 3000 K) and number densities of the <span>\\(^5S_2\\)</span> excited state of atomic oxygen (from near 0 to <span>\\(5\\times 10^{16}\\)</span> m<span>\\(^{-3}\\)</span>) in the arc-heated freestream at arc currents ranging from 100 to 250 Amperes, and with varying feed-gas mixtures composed of diatomic oxygen, diatomic nitrogen, and argon. Additionally, spatially-resolved diode laser absorption measurements of the same atomic oxygen energy-state population are collected near a silicon carbide test sample via an inverse Abel transform. Significant temporal flow transients are detected in the freestream on a 60-Hz timescale. These transients also propagate into the near-model shock layer. Further, qualitative agreement is obtained between absorption- and emission-based sensors. This study provides a quantitative, spatiotemporally-resolved dataset for future comparisons to computational models of the facility flowfield. The study also represents the first deployment of tunable diode laser absorption spectroscopy sensors in the Hypersonic Materials Environmental Test System.</p></div>","PeriodicalId":474,"journal":{"name":"Applied Physics B","volume":"131 6","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics B","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s00340-025-08476-1","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"OPTICS","Score":null,"Total":0}

引用次数: 0

Abstract

A tunable diode laser absorption spectroscopy sensor and a high-speed camera measuring narrow-band emission are deployed at the NASA Langley Hypersonic Materials Environmental Test System, a hypervelocity arc-heated tunnel. Both sensors target electronically-excited atomic oxygen. The sensors are used in conjunction to measure bulk translational temperatures (from 500 to 3000 K) and number densities of the \(^5S_2\) excited state of atomic oxygen (from near 0 to \(5\times 10^{16}\) m\(^{-3}\)) in the arc-heated freestream at arc currents ranging from 100 to 250 Amperes, and with varying feed-gas mixtures composed of diatomic oxygen, diatomic nitrogen, and argon. Additionally, spatially-resolved diode laser absorption measurements of the same atomic oxygen energy-state population are collected near a silicon carbide test sample via an inverse Abel transform. Significant temporal flow transients are detected in the freestream on a 60-Hz timescale. These transients also propagate into the near-model shock layer. Further, qualitative agreement is obtained between absorption- and emission-based sensors. This study provides a quantitative, spatiotemporally-resolved dataset for future comparisons to computational models of the facility flowfield. The study also represents the first deployment of tunable diode laser absorption spectroscopy sensors in the Hypersonic Materials Environmental Test System.

查看原文本刊更多论文

高超声速材料环境试验系统中空间分辨原子氧吸收和发射测量

一个可调谐二极管激光吸收光谱传感器和一个测量窄带发射的高速摄像机部署在美国宇航局兰利高超音速材料环境测试系统中，这是一个超高速电弧加热隧道。两个传感器都以电子激发的氧原子为目标。该传感器用于测量体平动温度（从500到3000 K）和数量密度原子氧的\(^5S_2\)激发态（从接近0到\(5\times 10^{16}\) m \(^{-3}\)）在电弧加热的自由流在电弧电流范围从100到250安培，并与不同的原料气混合物组成的双原子氧，双原子氮，和氩。此外，空间分辨的二极管激光吸收测量相同的原子氧的能量态族附近的碳化硅测试样品通过反阿贝尔变换收集。在60赫兹的时间尺度上，在自由流中检测到显著的时间流动瞬态。这些瞬态也传播到近模型激波层。此外，在基于吸收和基于发射的传感器之间获得了定性一致。该研究提供了一个定量的、时空分辨的数据集，以便将来与设施流场的计算模型进行比较。该研究还代表了在高超声速材料环境测试系统中首次部署可调谐二极管激光吸收光谱传感器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.