Recording human breathing for reproduction (part 1)
Reproducing human breathing accurately can be required for a number of reasons in laboratory conditions. This requires a recording method that allows the free movement of airflow while recording that movement. One type of device capable of this is the “screen pneumotachograph”. This uses a small low back pressure screen through which the airflow is passed, back and forth. This produces a small back pressure across the screen, which can be measured with a differential pressure gauge or manometer.
The two halves of the device can be separated and the screen removed for cleaning between test subjects (particularly important at this time). The differential pressure transducer provides a calibrated output that can be read by a computer data acquisition system.
With the Warwick Technology Digital Breathing Machine such a device can be supplied as an option. It takes the form of a screen pneumotachograph coupled with a rack mounting digital differential pressure unit. These are paired together with a UKAS calibration certificate. The pressure unit can provide signals back through the data acquisition system built in to the machine. Recording and manipulation software is provided with the option.