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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
Security lighting to prevent intrusions may be counter-productive. Turning off lights halved the number of thefts and burglary in Övertorneå Sweden. [2] [3] A test in West Sussex UK showed that adding all-night lighting in some areas made people there feel safer, although crime rates increased 55% in those areas compared to control areas and to the county as a whole.
Normally, light from the light source shoots straight across and misses the sensor. When smoke enters the chamber, it scatters the light, which then hits the sensor and triggers the alarm. Photoelectric smoke detectors typically respond faster to a fire in its early, smoldering stage, before the source of the fire bursts into flames.
Dementia is a devastating condition that can affect everything from your thinking to your personality. And while you can't always control your risk of developing the disease, new research finds ...
Because cancer cells take up more glucose than most other healthy cells, they light up in the images.” “Glucose and fructose are made up of the exact same atoms,” he continued.
The Billboard Music Awards returned for their 2024 edition, delivering a star-studded lineup of performances and appearances from chart-topping favorites like Tyla, Stray Kids, Teddy Swims ...
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