Use a specially designed 1,450-nm sensing beam, which is inherently absorbed by water, to make previously challenging clear-bottle/clear-water combination detection a high-contrast application, thereby enabling reliable detection. In addition, sensors have high excess gain to “burn through” colored glass, labeled/decorated bottles, and translucent milk jugs to detect the liquid contents. Sensors consist of an emitter and a choice of either a low-power receiver (for water in clear bottles) or a high-power receiver (for partially opaque containers).
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