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A new pressure sensor array, positioned on the bottom plate of a standardtorsional rheometer is presented. It is built from a unique piezo-capacitivepolymeric foam, and consists of twenty-five capacitive pressure sensors (ofsurface 4.5$\times$4.5 mm$^2$ each) built together in a 5$\times$5 regulararray. The sensor array is used to obtain a local mapping of the normalstresses in complex fluids, which dramatically extends the capability of therheometer. We demonstrate this with three examples. First, the pressure profileis reconstructed in a polymer solution, which enable the simultaneousmeasurement of the first and the second normal stress differences $N_1$ and$N_2$, with a precision of 2 Pa. In a second part, we show that negative normalstresses can also be detected. Finally, we focus on the normal stressfluctuations that extend both spatially and temporally ina shear-thickeningsuspension of cornstarch particles. We evidence the presence of local a uniqueheterogeneity rotating very regularly. In addition to their low-cost and highversatility, the sensors show here their potential to finely characterize thenormal stresses in viscosimetric flows.

A new pressure sensor array for local normal stress measurement in complex fluids