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An investigation of electro-optical 1/f noise reduction in an open-path tunable diode laser spectrometer.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	An investigation of electro-optical 1/f noise reduction in an open-path tunable diode laser spectrometer./
作者:	Mahdi, Samira A.
面頁冊數:	1 online resource (184 pages)
附註:	Source: Dissertations Abstracts International, Volume: 75-06, Section: B.
Contained By:	Dissertations Abstracts International75-06B.
標題:	Aerospace engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3601565click for full text (PQDT)
ISBN:	9781303530128

An investigation of electro-optical 1/f noise reduction in an open-path tunable diode laser spectrometer.
Mahdi, Samira A.

An investigation of electro-optical 1/f noise reduction in an open-path tunable diode laser spectrometer. - 1 online resource (184 pages)

Source: Dissertations Abstracts International, Volume: 75-06, Section: B.

Thesis (Ph.D.)--University of Arkansas at Little Rock, 2013.

Includes bibliographical references

A mobile spectrometer system has been designed to scan the near-surface atmosphere for ammonia gas over a wide range of distances (10 m to 1 Km). Since the system is designed for space applications, it needs to be small, light weight, and low power, which dictates the use of relatively low frequency measurement scans. The spectrometer uses a diode laser, which is subject to a large of electro-optical 1/f noise component at these low frequencies. In this work, digital signal processing techniques are developed to reduce the effects of 1/f noise in gas measurements. A Double Fast Fourier Transform-Based Filter (DFFT-BF) method is developed to maximize the measurement sensitivity of a low frequency Tunable Diode Laser Spectrometer (TDLS) system. The 1/f noise spectrum and the uncertainty in the wavelength of the diode laser emission due to 1/f frequency noise is investigated in both simulations and experiments. Also, measurements of ammonia gas using its 1543 nm absorption peak were performed using a sinusoidal waveform to drive the diode laser. A signal processing method is proposed that reduces the effects of electro-optical 1/f noise while keeping the measurement signal relatively constant. Measurements with different modulated waveforms are also examined, including a sawtooth with superimposed sine wave and a sinusoidal wave with a multiple step offset to drive the diode laser. In addition, the system is tested in outdoor measurements of ammonia gas concentrations. The results show that the DFFT-BF method reduces the effects of the 1/f noise in the measurement.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781303530128Subjects--Topical Terms:

1002622
Aerospace engineering.
Subjects--Index Terms:

AmmoniaIndex Terms--Genre/Form:

542853
Electronic books.

An investigation of electro-optical 1/f noise reduction in an open-path tunable diode laser spectrometer.
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504 $a Includes bibliographical references
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