Electrical Engineering by E.E. Kimberly

By E.E. Kimberly

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3 Parasitic and Cross-effects in Sensing Elements There exists also a large group of simple sensing elements with electrical properties that can be characterized with a single electrical network element whose main value depends on the physical signal to be measured. e. besides the sensitivity for the measurand, they also show an undesired sensitivity for other physical quantities, such as temperature, mechanical vibrations, etc. The use of additional sensing elements can provide additional information to improve the reliability and compensate for cross-effects.

Reproduced by permission of G. 17 Block diagram of the UTI system A number of sensing elements, a reference element, and optionally a biasing element have been connected to the input terminals of the UTI chip. A selector (MUX) connects sequentially each of these elements to one of the specific front ends. The selector (MUX) is controlled by a phase counter, which counts 3, 4 or 5 phases, as discussed further on in this section. 3. The mode-specific front end is connected to a modulator, which consists of a relaxation oscillator.

Only smart sensors make this economically viable. 22). 23. 24). 21 Sensors in a car P1: OTA/XYZ P2: ABC c01 JWBK268-Meijer August 13, 2008 17:27 Printer Name: Yet to Come Smart Sensor Systems: Why? Where? How? 3 Smart Domestic Appliances Domestic appliances still do not take over all the housework. But the time will come when the vacuum cleaner will automatically move from its socket once a week and vacuum the rooms, without running over a cat or knocking over a vase. 25). The refrigerator will detect when the supply of certain items is running low and will communicate this, so that it can be refurnished.

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