A robust, portable H-TDMA for field use

Johnson, Graham R., Fletcher, Catherine A., Meyer, Nickolas K., Modini, Robin L., & Ristovski, Zoran (2008) A robust, portable H-TDMA for field use. Journal of Aerosol Science, 39(10), pp. 850-861.

PDF (293kB)
Author version.

View at publisher


The complexity of a typical hygroscopicity tandem differential mobility analyser (H-TDMA) can make it an awkward instrument for fieldwork. An improved design is presented here which is both light weight and portable and permits very accurate, reliable hygroscopic growth, deliquescence and efflorescence measurements for aerosols over a continuous relative humidity range from 10% to 98% without reconfiguration.

The method achieves this through three significant advances in H-TDMA design: Firstly, the approach regulates the humidity by rapidly alternating the air flow between a dryer and a saturator, with the time spent in each path controlled by a feedback loop connected to the humidity sensor. Secondly the temperature of the aerosol humidifier is directly coupled to that of the wet DMA by enveloping the humidifier in the wet DMA's excess air flow. Thirdly, a novel arrangement of two NafionTM tubes in the humidifier allows for high humidities without needing to pre-wet the aerosol flow.

Impact and interest:

12 citations in Scopus
12 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

347 since deposited on 21 Feb 2008
15 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 12606
Item Type: Journal Article
Refereed: Yes
Keywords: H-TDMA, Relative humidity, hygroscopic growth, deliquescence
DOI: 10.1016/j.jaerosci.2008.05.005
ISSN: 0021-8502
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Synchrotrons; Accelerators; Instruments and Techniques (029904)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2008 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 21 Feb 2008 00:00
Last Modified: 21 Jun 2017 14:39

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page