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Based on the laser Doppler effect, real-time and on-line measurements of velocity in high-speed flows can be realized using tunable diode laser absorption spectra (TDLAS). The fundamental theory and the method to measure the velocity are presented. A dual-beam system used in the experiments is described. The water vapor absorption feature at 1398 nm is utilized to detect the flows generated within a wind tunnel. The DFB laser is quickly tuned at a rate of 10 kHz to obtain the spectra of the transient flows by using scanned-wavelength direct absorption spectroscopy. The ways to calibrate the frequency and calculate the Doppler shift (DS) are also introduced. The measured velocity is compared with the calculated velocity, and they are in good agreement with each other, which proves that the way combining DS with TDLAS to measure the velocity in high-speed flows is reasonable. The system capability and possible factors to induce measurement deviations are analyzed to improve the system performance in the future.
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Keywords:
- TDLAS /
- Doppler shift /
- velocity
[1] Curl R F, Tittel F K 2002 Annu. Rep. Prog. Chem. Sect. 98 219
[2] Kent L 2005 Development of a real-time diode laser mass flux sensor for simultaneous measurement of density and velocity of oxygen Ph. D. Dissertation (Stanford: Stanford University)
[3] Shawn D W 2000 Development of a tunable diode laser probe for measurements in hypervelocity flows Ph. D. Dissertation (Stanford: Stanford University)
[4] Todd B, Skip W 2006 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference Sacramento, California, 9–12 July 2006 4395
[5] Li G C 2004 Optical Instrumentation for Wind Tunnel Testing (Vol.1)(Beijing: National Defense Industrial Press)pp118–143 (in Chinese)[李桂春 2004 风洞实验光学测量方法 (第1版)(北京:国防工业出版社)第118-143页]
[6] Zhou X 2005 Diode-laser absorption sensors for combustion control Ph. D. Dissertation (Stanford: Stanford University)
[7] Xu Z Y, Liu W Q, Kan R F 2010 Spectrosc. Spect. Anal. 30 2201 (in Chinese)[许振宇,刘文清,阚瑞峰 2010 光谱学与光谱分析 30 2201]
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[1] Curl R F, Tittel F K 2002 Annu. Rep. Prog. Chem. Sect. 98 219
[2] Kent L 2005 Development of a real-time diode laser mass flux sensor for simultaneous measurement of density and velocity of oxygen Ph. D. Dissertation (Stanford: Stanford University)
[3] Shawn D W 2000 Development of a tunable diode laser probe for measurements in hypervelocity flows Ph. D. Dissertation (Stanford: Stanford University)
[4] Todd B, Skip W 2006 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference Sacramento, California, 9–12 July 2006 4395
[5] Li G C 2004 Optical Instrumentation for Wind Tunnel Testing (Vol.1)(Beijing: National Defense Industrial Press)pp118–143 (in Chinese)[李桂春 2004 风洞实验光学测量方法 (第1版)(北京:国防工业出版社)第118-143页]
[6] Zhou X 2005 Diode-laser absorption sensors for combustion control Ph. D. Dissertation (Stanford: Stanford University)
[7] Xu Z Y, Liu W Q, Kan R F 2010 Spectrosc. Spect. Anal. 30 2201 (in Chinese)[许振宇,刘文清,阚瑞峰 2010 光谱学与光谱分析 30 2201]
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