12/2021-              Associated Professor, Center for Combustion Energy, Tsinghua University

12/2015-11/2021 Assistant Professor, Center for Combustion Energy, Tsinghua University

01/2013-12/2015 Chief Scientist, Oxigraf Inc., Mountain View, California, USA

02/2014-02/2015 Visiting Scholar, High Temperature Gasdynamics Laboratory , Stanford University, California, USA

09/2007-01/2013 Research Assistant, High Temperature Gasdynamics Laboratory, Stanford University, California, USA

08/2005-07/2007 Research assistant, Center for Photonics and Electronics, Department of Precision Instruments and Mechanology, Tsinghua University, China

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Optical Diagnostics; Laser Spectroscopy; Combustion Gas Sensing; Practical Combustion System Monitoring; Respiratory Gas Sensing; Environmental Sensing; Instrumentation.

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Patents:

1. Xing Chao, Zhenhai Wang, Weitian Wang, Xiaoliang Chen, Pengfei Fu, ”A deep-learning tomographic reconstruction system based on wavelength modulation absorption spectroscopy,” Faming Zhuanli Shenqing Gongkai Shuomingshu (2021) (China patent) 2021-11-17, CN202111362939.9.

2. Xing Chao, Zhenhai Wang, Weitian Wang, Lingyun Hou, Pengfei Fu, Xiaoliang Chen, Ning Zhu, Zihao Song, “A single-ended multi-species gas sensing system based on diffuse reflected laser absorption spectroscopy,” Faming Zhuanli Shenqing Gongkai Shuomingshu (2021) (China patent) 2021-9-17, CN202111091111.4.

3. Lingyun Hou, Pengfei Fu, Xing Chao, “An integrated online sensing system for temperature and species diagnostics in confined spaces,” Faming Zhuanli Shenqing Gongkai Shuomingshu (2021) (China patent) 2021-02-05, CN202110159754.1.

4. Xun Cao, Yan Zhang, Lijing Cai, Xiaoliang Chen, Xing Chao, Jinli Suo, Qionghai Dai, “A method and system for real-time hyperspectral tomographic videoing,” Faming Zhuanli Shenqing Gongkai Shuomingshu (2021) (China patent) 2022-02-08, CN112229827B

5. Ronald K. Hanson, Jay B. Jeffries, Kai Sun, Ritobrata Sur, Xing Chao, "A method for calibration-free scanned-wavelength-modulation spectroscopy for gas sensing," US patent, PCT/US2012/070523, Stanford Docket Number S11-403.

6. Mali Gong, Ping Yan, Xing Chao, Chen Li, "Method and product capable of avoiding strict control on pumping wavelength of optical fiber amplifier or laser," Faming Zhuanli Shenqing Gongkai Shuomingshu (2010) (China patent) 2010-12-01, CN101281338B.

7. Mali Gong, Ping Yan, Xing Chao, Chen Li, "Amplification method and device for self-seed superradiation optical fiber," Faming Zhuanli Shenqing Gongkai Shuomingshu (2007) (China patent) 2007-03-23, CN200710064755.8.

1. Wang Z, Zhu N, Wang W, Chao X. Y-Net: a dual-branch deep learning network for nonlinear absorption tomography with wavelength modulation spectroscopy. Optics Express. 2022;30:2156-72.

2. Wang Z, Wang W, Ma L, Fu P, Ren W, Chao X. Mid-infrared CO2 sensor with blended absorption features for non-uniform laminar premixed flames. Applied Physics B-Lasers and Optics. 2022;128.

3. Yu Z, Dongmei W, Xiaoliang C, Xing C, Haitao X. Uniform breaking of liquid-jets by modulated laser heating. Physics of Fluids. 2021;33:044115 (14 pp.)- (14 pp.).

4. Wang W, Wang Z, Chao X. Gaussian process regression for direct laser absorption spectroscopy in complex combustion environments. Optics Express. 2021;29:17926-39.

5. Song Z, Wang W, Zhu N, Chao X. Gas velocimetry based on infrared laser-induced fluorescence. Physics of Fluids. 2021;33.

6. Song Z, Chao X. Vibrational energy transfer kinetics for quantitative species diagnostics using infrared laser-induced fluorescence. Combustion and Flame. 2021;224:196-208.

7. Wang Z, Fu P, Hou L, Chao X. Diffuse-reflection-based single-ended laser absorption sensor for H2O temperature and concentration in kerosene-fuelled combustor. Measurement Science and Technology. 2020;31.

8. Wang Z, Fu P, Chao X. Baseline reduction algorithm for direct absorption spectroscopy with interference features. Measurement Science and Technology. 2020;31.

9. Wang Z, Fu P, Chao X. Laser Absorption Sensing Systems: Challenges, Modeling, and Design Optimization. Applied Sciences-Basel. 2019;9.

10. Chao X, Shen G, Sun K, Wang Z, Meng Q, Wang S, et al. Cavity-enhanced absorption spectroscopy for shocktubes: Design and optimization. Proceedings of the Combustion Institute. 2019;37:1345-53.

11. Shen G, Chao X, Sun K. Modeling the optical field in off-axis integrated-cavity-output spectroscopy using the decentered Gaussian beam model. Applied Optics. 2018;57:2947-54.

12. Sun K, Wang S, Sur R, Chao X, Jeffries JB, Hanson RK. Sensitive and rapid laser diagnostic for shock tube kinetics studies using cavity-enhanced absorption spectroscopy. Optics Express. 2014;22:9291-300.

13. Sun K, Wang S, Sur R, Chao X, Jeffries JB, Hanson RK. Time-resolved in situ detection of CO in a shock tube using cavity-enhanced absorption spectroscopy with a quantum-cascade laser near 4.6 mu m. Optics Express. 2014;22:24559-65.

14. Sun K, Sur R, Chao X, Jeffries JB, Hanson RK, Pummill RJ, et al. TDL absorption sensors for gas temperature and concentrations in a high-pressure entrained-flow coal gasifier. Proceedings of the Combustion Institute. 2013;34:3593-601.

15. Sun K, Chao X, Sur R, Jeffries JB, Hanson RK. Wavelength modulation diode laser absorption spectroscopy for high-pressure gas sensing. Applied Physics B-Lasers and Optics. 2013;110:497-508.

16. Sun K, Chao X, Sur R, Goldenstein CS, Jeffries JB, Hanson RK. Analysis of calibration-free wavelength-scanned wavelength modulation spectroscopy for practical gas sensing using tunable diode lasers. Measurement Science and Technology. 2013;24.

17. Chao X, Jeffries JB, Hanson RK. Development of laser absorption techniques for real-time, in-situ dual-species monitoring (NO/NH3, CO/O-2) in combustion exhaust. Proceedings of the Combustion Institute. 2013;34:3583-92.

18. Chao X, Jeffries JB, Hanson RK. Real-time, in situ, continuous monitoring of CO in a pulverized-coal-fired power plant with a 2.3 mu m laser absorption sensor. Applied Physics B-Lasers and Optics. 2013;110:359-65.

19. Chao X, Jeffries JB, Hanson RK. Wavelength-modulation-spectroscopy for real-time, in situ NO detection in combustion gases with a 5.2 mu m quantum-cascade laser. Applied Physics B-Lasers and Optics. 2012;106:987-97.

20. Chao X, Jeffries JB, Hanson RK. In situ absorption sensor for NO in combustion gases with a 5.2 mu m quantum-cascade laser. Proceedings of the Combustion Institute. 2011;33:725-33.

21. Wang F, Cen KF, Li N, Huang QX, Chao X, Yan JH, et al. Simultaneous measurement on gas concentration and particle mass concentration by tunable diode laser. Flow Measurement and Instrumentation. 2010;21:382-7.

22. Chao X, Jeffries JB, Hanson RK. Absorption sensor for CO in combustion gases using 2.3 mu m tunable diode lasers. Measurement Science and Technology. 2009;20.