Method for digitally controlling a sensor system

Details Method for digitally controlling a sensor system Method for digitally controlling a sensor system

2006-03-14

2006-03-14

Oen, William (Department: 2855)

Measuring and testing

Fluid pressure gauge

Combined

Reexamination Certificate

active

07010983

ABSTRACT:
Systems and methods for digitally controlling sensors. In one embodiment, a digital controller for a capacitance diaphragm gauge is embedded in a digital signal processor (DSP). The controller receives digitized input from a sensor AFE via a variable gain module, a zero offset module and an analog-to-digital converter. The controller automatically calibrates the received input by adjusting the variable gain and zero offset modules. The controller also monitors and adjusts a heater assembly to maintain an appropriate temperature at the sensor. The controller utilizes a kernel module that allocates processing resources to the various tasks of a gauge controller module. The kernel module repetitively executes iterations of a loop, wherein in each iteration, all of a set of high priority tasks are performed and one of a set of lower priority tasks are performed. The controller module thereby provides sensor measurement output at precisely periodic intervals, while performing ancillary functions as well.

REFERENCES:
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patent: 6125291 (2000-09-01), Miesel et al.
patent: 6182019 (2001-01-01), Wiklund
patent: 6289259 (2001-09-01), Choi et al.
International Search Report for PCT/US03/16911 mailed Nov. 3, 2003.

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