Abstract
The dynamic performance of a new fibre optic sensor intended for measuring physiological fluid pressures is assessed in water. The sensor's sensitivity is evaluated at 23°, 35° and 37°C against a Millar pressure catheter for sinusoidal pressure inputs with frequency ranging from 0.5 to 10 Hz. We found that sensitivity versus frequency is flat to 6 Hz and decreases slightly between 6 and 10 Hz. The sensitivity is slightly lower at 23°C than at 37°C. The reproducibility of measurements is excellent (two separate calibration tests in two consecutive days). The output of the fibre optic system used shows a constant time delay (0.13 s) for all frequencies tested. Experiments suggest that, with current sensor design, its immersion in degassed water prior to use ensures a reliable performance.
Original language | English (US) |
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Pages (from-to) | N13-N19 |
Journal | Physiological Measurement |
Volume | 26 |
Issue number | 4 |
DOIs | |
State | Published - Aug 1 2005 |
Keywords
- Fibre optic sensor
- Fluid pressure
- Measuring instruments
ASJC Scopus subject areas
- Biophysics
- Physiology
- Biomedical Engineering
- Physiology (medical)