Determine diffusivity of your sample
The diffusivity sensor enables you to calculate the diffusitivity of e.g. a sediment sample. The diffusivity is an important parameter to know in order to calculate the flux in a sample.
The principle of this sensor is illustrated in the figure below. A tracer gas coming from a gas reservoir inside the sensor is diffusing out of the sensor tip membrane. The tracer gas will diffuse away from the sensor tip with a specific rate depending on the type of sediment, e.g. in a high porous sediment the tracer gas will quickly diffuse away from the sensor tip. The diffusitivity rate is measured as the concentration of tracer gas around the microsensor tip.
Calibration of the diffusivity microsensor is carried out by mounting it vertically with the tip immersed in two different media with known porosity and diffusion coefficient.
|Standard Glass Sensor||Outside tip diameter|