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A direct digital synthesis chirped pulse Fourier transform microwave spectrometer

Finneran, Ian A. and Holland, Daniel B. and Carroll, P. Brandon and Blake, Geoffrey A. (2013) A direct digital synthesis chirped pulse Fourier transform microwave spectrometer. Review of Scientific Instruments, 84 (8). Art. No. 083104. ISSN 0034-6748.

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Chirped pulse Fourier transform microwave (CP-FTMW) spectrometers have become the instrument of choice for acquiring rotational spectra, due to their high sensitivity, fast acquisition rate, and large bandwidth. Here we present the design and capabilities of a recently constructed CP-FTMW spectrometer using direct digital synthesis (DDS) as a new method for chirped pulse generation, through both a suite of extensive microwave characterizations and deep averaging of the 10-14 GHz spectrum of jet-cooled acetone. The use of DDS is more suited for in situ applications of CP-FTMW spectroscopy, as it reduces the size, weight, and power consumption of the chirp generation segment of the spectrometer all by more than an order of magnitude, while matching the performance of traditional designs. The performance of the instrument was further improved by the use of a high speed digitizer with dedicated signal averaging electronics, which facilitates a data acquisition rate of 2.1 kHz.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Finneran, Ian A.0000-0003-2506-4652
Holland, Daniel B.0000-0002-3404-4939
Carroll, P. Brandon0000-0002-3191-5401
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 2013 AIP Publishing LLC. Received 4 June 2013; accepted 27 July 2013; published online 15 August 2013. The authors would like to acknowledge the National Science Foundation (Grant No. CHE-1214123 and the Graduate Research Fellowship Program) and National Aeronautics and Space Administration (Grant No. NNX09AM84G) for financial support, the Pate lab for helpful comments and the use of their AWG, Steve Shipman for CP-FTMW advice, Jeff Groseth for electrical support, Bob Dengler for DDS advice, an anonymous referee for a careful and observant review and bringing our attention to the early history of pulsed microwave spectroscopy, and the rest of the Blake lab, especially Brett McGuire, for their support.
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
Subject Keywords:Fourier transform spectrometers, microwave spectrometers
Issue or Number:8
Classification Code:PACS: 07.57.Pt
Record Number:CaltechAUTHORS:20131003-134419078
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41661
Deposited By: Tony Diaz
Deposited On:03 Oct 2013 22:21
Last Modified:10 Dec 2020 20:43

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