Characterization of a density-corrected ultrasonic pneumotachometer for horses.

The research focuses on evaluating and examining the characteristics of a density-corrected ultrasonic pneumotachometer, named UF202, specially designed for horses. The study aims to ensure this device can accurately measure the breath-by-breath airflow of exercising horses.

Research Methodology

• A custom-built apparatus was used to evaluate and characterize the UF202.
• The UF202 was designed to give voltage outputs for airflow through and gas density within the flowhead.
• Different aspects of the UF202 such as baseline stability, linearity, accuracy, repeatability, resolution, rise time, frequency response, gain, and resistance were investigated during the characterization.

Findings

• The baseline stability of the flow channel output (VUF202) was found to be less than 0.35% full scale (FS).
• VUF202 demonstrated linearity over a range of +/- 50 l/s with R2 more than or equal to 0.9976.
• Under optimal conditions, the accuracy of VUF202 stood at +/- 1.00% FS and its repeatability at +/- 0.78% FS.
• The resolution of VUF202 was recognized as 24 ml/s.
• The rise time for VUF202 was measured to be 18 ms, and the -3-dB point was 18 Hz.
• Digital compensation provided a flat frequency response to VUF202 up to 32 Hz.
• VUF202 gain remained stable over an 8-day period.
• Density channel output (PUF202) was linear within a range of 1.11-1.23 g/l with an R2 of more than or equal to 0.9645.
• The accuracy of PUF202 was calculated as +/- 0.50% FS, while its repeatability was noted as +/- 0.30% FS.
• The resistance of the flowhead was gauged to be 0.013 cmH2O.l-1.s at a flow rate of 40 l/s.

Conclusion

The researchers concluded that their findings endorse the efficacy of UF202 in facilitating precise measurement of breath-by-breath airflow in exercising horses. The UF202’s accurate measurements and stable performance make it suitable for its intended use.