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Is that warehouse about to collapse? Is that turbine about to throw a blade? Is that oil well going to explode?

All good questions, particularly if you happen to be standing nearby. But for managers at asset-intensive businesses, keeping tabs on heavy machinery and vital infrastructure goes beyond the desire to minimize head wounds. Indeed, tracking the status of far-flung equipment is a crucial part of keeping operations up and running.

It's also expensive. That may explain why so many companies are starting to deploy wireless sensors on and around fixed assets. Sensors go where humans fear to tread — deep inside tanker cars, into the heart of whirring engines, and into countless other environments that can best be described as hellish. And unlike passive radio frequency tags, which transmit small bits of data, the latest generation of wireless sensors produces reams of useful information about machinery, equipment, and structures.

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