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| Passive Infrared Ceiling Mount Occupancy Sensors |
| The ultrasonic sensors, using an advanced. omni-directional Doppler principle, works by bouncing ultrasonic sound waves off objects in a space which then measures the time it takes for the waves to return. Movement by a person in the space causes the sound waves to bounce back at a different frequency, resulting in a Doppler shift and occupancy detection. |
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