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Measurement and Analysis of Overlapping Ammonia Spectral Lines via Dual‐Comb Spectroscopy.

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Title: Measurement and Analysis of Overlapping Ammonia Spectral Lines via Dual‐Comb Spectroscopy.
Authors: Rong, Shuangquan1 (AUTHOR), Sun, Xiaocong1,2 (AUTHOR) sunxiaocong@tyust.edu.cn, Zhou, Yueting2 (AUTHOR), Gong, Ting2 (AUTHOR), Tian, Yali2 (AUTHOR), Qiu, Xuanbing2 (AUTHOR), Li, Chuanliang1,2 (AUTHOR) clli@tyust.edu.cn
Source: Microwave & Optical Technology Letters. Mar2026, Vol. 68 Issue 3, p1-6. 6p.
Subjects: Spectral lines, Atmospheric ammonia, Light absorption, Measurement, Spectrometry, Near infrared spectroscopy, Detection limit
Abstract: Ammonia (NH₃) emissions pose significant hazards to both the environment and human health, making high‐precision monitoring of ambient NH₃ concentrations particularly crucial. In this study, a high‐precision NH₃ detection system was designed based on near‐infrared dual‐comb spectroscopy (DCS). A laser source with a central wavelength of 1531 nm is employed as the laser relay; by locking the relative frequencies of two optical combs to the relay laser separately, dual‐comb with a central frequency of 1531 nm, a repetition rate of 518.25 Hz, and an output power of 30 μW is generated. A multi‐pass gas absorption cell with a base length of 0.113 m and 250 reflections is utilized to achieve an effective optical path length of approximately 25 m. Under conditions of 296.15 K and 1 atm, three overlapping absorption lines at 6528.78 cm⁻¹, 6528.88 cm⁻¹, and 6529.18 cm⁻¹ of 1000 ppm NH₃ are detected, verifying the feasibility of high‐resolution dual‐comb spectroscopy for measuring overlapping spectral lines. Allan variance analysis is performed on the experimental data, yielding a minimum detection limit (MDL) of 0.00128 for absorbance at an integration time of 972 s, corresponding to a concentration MDL of ~2 ppm. This research provides technical insights for achieving high‐precision measurement and analysis of overlapping spectral lines. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Ammonia (NH₃) emissions pose significant hazards to both the environment and human health, making high‐precision monitoring of ambient NH₃ concentrations particularly crucial. In this study, a high‐precision NH₃ detection system was designed based on near‐infrared dual‐comb spectroscopy (DCS). A laser source with a central wavelength of 1531 nm is employed as the laser relay; by locking the relative frequencies of two optical combs to the relay laser separately, dual‐comb with a central frequency of 1531 nm, a repetition rate of 518.25 Hz, and an output power of 30 μW is generated. A multi‐pass gas absorption cell with a base length of 0.113 m and 250 reflections is utilized to achieve an effective optical path length of approximately 25 m. Under conditions of 296.15 K and 1 atm, three overlapping absorption lines at 6528.78 cm⁻¹, 6528.88 cm⁻¹, and 6529.18 cm⁻¹ of 1000 ppm NH₃ are detected, verifying the feasibility of high‐resolution dual‐comb spectroscopy for measuring overlapping spectral lines. Allan variance analysis is performed on the experimental data, yielding a minimum detection limit (MDL) of 0.00128 for absorbance at an integration time of 972 s, corresponding to a concentration MDL of ~2 ppm. This research provides technical insights for achieving high‐precision measurement and analysis of overlapping spectral lines. [ABSTRACT FROM AUTHOR]
ISSN:08952477
DOI:10.1002/mop.70519