Journal
APPLIED OPTICS
Volume 60, Issue 26, Pages 8206-8212Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.433294
Keywords
-
Categories
Funding
- National Natural Science Foundation of China [61475085]
Ask authors/readers for more resources
Direct absorption spectroscopy is a practical and effective technology for gas concentration detection. A dual-logarithmic demodulation method is proposed and proven to be robust in situations where optical thickness is much greater than linear region.
Direct absorption spectroscopy (DAS) is an extremely practical and effective technology to detect gas concentration in site applications. Dual-beam subtraction is one of the most common demodulation methods in DAS, yet this method cannot solve the problem of absolute absorption curve nonlinearization in a wide optical thickness range. A real-time and practical dual-logarithmic demodulation method is proposed and proved to be robust when the optical thickness is much greater than linear region. Moreover, the error of optical thickness peak is only 1.18% between the dual-logarithmic demodulation system and simulation after correcting the dual-beam subtraction demodulation system under a 300 K, 1 atm, and 3 m absorption path. When the range of optical thickness peak of acetylene is from 0.0252 to 2.5335 at 1532.83 nm, the peak voltages always maintain satisfactory linearity (R-square = 0.9989). (C) 2021 Optical Society of America
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available