Patent ID: 11874291
Assignee: ROBERT BOSCH GMBH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A microelectromechanical sensor, comprising:
a movable structure;
at least one thermal element;
two temperature measurement elements; and
an evaluation unit;
wherein the movable structure is configured to measure a physical stimulus, and the sensor is configured to perform the following:
determining a temperature difference between a first and a second temperature measurement point, the first and second temperature measurement points being spaced apart from one another, a local temperature increase within the sensor being brought about by at least one thermal element, regulation of the temperature increase taking place so that the temperature difference between the first and second temperature measurement points is minimized; and
measuring the physical stimulus using a deflection, so as to provide a measured deflection, of the movable structure;
wherein the deflection caused by the temperature gradient is measured only when a stable temperature profile is obtained, wherein the measurement of the deflection takes place with a time delay relative to activation of the thermal element, and wherein the first and second temperature measurement points are monitored and the measurement of the deflection takes place only when the first and second temperatures have assumed a stable value, and
wherein to separate the deflection brought about by the physical stimulus from a thermal influence of the temperature gradient, the third and fourth temperatures in the two measurement points are determined simultaneously together with the deflection, and wherein together with the third and fourth temperatures, the corrected measured value of the physical stimulus are ascertained from the compensation value, which quantifies the thermal influence of the temperature gradient.