Modeling the Radiation of a Commercial Sensor, the Fish Fat Meter, in a Multilayer Biological Material

S. Clerjon
Centre INRA de Theix, St Genes Champanelle, France

The Fish Fat Meter sensor is used for in vivo measurement of intramuscular fat content in fishes. It is based on the propagation of a 2 GHz wave along a micro-strip line placed against the fish. It is used at INRA to select fat or lean fish in fish-farming studies.

COMSOL Multiphysics has been used to perform 2D and 3D modeling in order to support recommendations to users of the Fish Fat Meter. The 2D model is useful to quantify radiation in each subdomain. On the other hand, the 3D model was used to simulate wave propagation in tissues.

Modeling allowed for the study of parameters corresponding to potential measurement bias: muscle anisotropy, gradient in fat content, skin thickness, and under-skin fat thickness.