liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Improved accuracy and extended flow range for a Fleisch pneumotachograph
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
National Defense Research Establishment, Division of Human Sciences, Aviation Medicine, Linköping, Sweden.
1999 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 37, no 4, 456-460 p.Article in journal (Refereed) Published
Abstract [en]

A large linear flow range and a small instrumental dead space volume are incompatible properties for a pneumotachometer (PTM). The linearity of a Fleisch number 2 PTM is studied for flows up to 6 litre s−1 (nominal range 0–2 litre s−1) with various up- and downstream geometries. It is hypothesised that using an array of calibration factors (conductance; flow/pressure), instead of a single calibration factor over the entire flow range, could improve accuracy and also extend the applicable flow range. The conductance against pressure characteristics are calculated with a previously described weighted averaging technique based on multiple strokes from a precision syringe. A single conductance value gives stroke volume errors in the range of −5 to 3% (0–2 litre s−1) and −6 to 11% (0–6 litre s−1) for validation using the same geometry as for calibration. The pressure dependent conductance improves accuracy to within −3% and 1% independent of flow range. However, for validation using a different geometry than for calibration, errors range from −5% to +8%. The degree of non-linearity varies between the geometries (range 3–15%) and is highest when using a one-directional valve upstream of the PTM and a Y-shaped connector. In conclusion, a pressure-dependent conductance improves accuracy and can also be used to extend the applicable flow range up to at least three times the nominal flow range.

Place, publisher, year, edition, pages
1999. Vol. 37, no 4, 456-460 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-32563DOI: 10.1007/BF02513330Local ID: 18476OAI: diva2:253386
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-02-18

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Strömberg, Tomas
By organisation
Department of Biomedical EngineeringThe Institute of Technology
In the same journal
Medical and Biological Engineering and Computing
Medical and Health Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 449 hits
ReferencesLink to record
Permanent link

Direct link