Optical sensors work just like photocell sensors, but they emit infrared light as opposed to visible light. Only detect smaller objects within a limited range (40 feet or 12.19 m or less).Require professional installation due to height requirement.Detect movement beyond glass and through other objects.They also have a limited range of 40 feet (12.19 m) or less, so you’ll need more than one for most homes. Microwave sensors are expensive and often require professional installation due to their height requirement. They can detect movement beyond glass because microwaves are reflected off of the person or object, even when they’re behind glass. These sensors use microwave technology rather than infrared or visible light. Here’s a rundown of these alternatives and their pros and cons: Microwave Sensors So far, I’ve only discussed PIR and photocell technologies, but there are other types of motion sensors to consider. Typically, when the bulb picks a change in the visible spectrum, it has detected motion.Īnd since glass doesn’t absorb this part of the light spectrum, you can get motion detection beyond any glass obstacle. Since light travels through glass, this type of bulb can detect movement beyond the glass. These bulbs use photocell sensors that detect infrared and visible light. In general, a radar motion sensor bulb works through glass. Which Motion Sensor Bulb Works Through Glass? Here’s a video that describes how these sensors work: Other types of motion sensors that use PIR technology suffer from the same shortcoming. Therefore, the sensors can’t detect movement beyond the glass because there’s no heat. However, when there’s a glass barrier between the sensor and object, the glass absorbs all of the heat. However, humans detect this energy in the form of heat, which is why most motion sensor light bulbs are equipped with infrared emitters. In simple terms, infrared means the type of energy invisible to the human eye. However, if that person stands behind a pane of glass, then no infrared energy will reach one sensor and set off the motion sensor light bulb. When a human being enters the detection zone of a PIR sensor, it detects infrared energy and triggers the lights. Passive infrared radiation (PIR) is a type of radiation with wavelengths from 0.7 to 1 millimeters. They typically feature two pyroelectric sensors positioned at an angle to each other. Motion sensor light bulbs use PIR technology. To understand why your motion sensor light bulbs won’t detect any movement beyond glass obstacles, you need to have a basic sense of how these sensors work. The Bottom Line Why Motion Sensor Light Bulbs Don’t Work Through Glass
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