High resolution gas volume change sensor

For research on gas exchange processes in biologic systems, such as the middle ear, a gas volume change detector with microliter resolution is available. The sensor is based on optical detection of the movement of a droplet enclosed in a capillary.

The device is easy to use and delivers gas volume data at a rate of more than 15 measurements/s and a resolution better than 0.06 microliter. At the onset of a gas quantity change the sensor shows a small pressure artifact of less than 15 Pa, and at constant change rates the pressure artifact is smaller than 10 Pa or 0.01% of ambient pressure.

For detailed description:
J.J.J. Dirckx, J.E.F. Aernouts, J.R.M. Aerts, ‘High resolution gas volume change sensor’, Review of scientific instruments, 78(5): 054705(1-5), 2007.
doi:10.1063/1.2737778