Integrated microstructure sensor element for detecting...

Details Integrated microstructure sensor element for detecting... Integrated microstructure sensor element for detecting...

2008-04-22

2008-04-22

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

A material property using electrostatic phenomenon

In a liquid

C324S451000, C073S061760, C374S044000

Reexamination Certificate

active

10150425

ABSTRACT:
An integrated microstructure sensor element is proposed for detecting thermodynamic measured variables of a fluid. To that end, a supporting body, particularly a board or a wafer having at least one microstructured heating element in contact with the fluid during operation, is provided, on which or in whose vicinity are arranged first arrangement for at least intermittently acting on the heating element with an electric alternating current of defined frequency or a defined frequency band, as well a second arrangement for detecting the amplitude of the third harmonic wave of the electric voltage applied to the heating element. The proposed microstructure sensor element in the form of a compact, integrated component is suitable in particular for determining or monitoring the thermal conductivity and/or the thermal capacity of a fluid, particularly an oil in a motor vehicle.

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N.O. Birge et al., “Specific Heat Specroscopy: Origins, Status and Applications of the 3ω-Method”, Thermochimica Acta, 304/305, pp. 51-66 (1997).

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