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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.
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.
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.
Melania also commented on whether her son, Barron Trump, will be joining them at the White House.Barron, 18, recently moved from the family's Mar-a-Lago mansion in Palm Beach up to New York City ...
January's full moon may have you howling! Nicknamed the Wolf Moon, this month's lunation will reach peak fullness at 2:27 p.m. PT on Jan. 13, marking the first full moon of 2025 and rising two ...
New Year’s Eve in Taipei, the capital city of the island of Taiwan, is a masterpiece of visual spectacle.The city’s tallest building, Taipei 101, is the launching pad for the vibrant, vertical ...
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