Understanding Infrared Sensors
What is an Infrared Sensor?
An infrared sensor finds or sends out infrared light. Because of this, it can sense its surroundings. For example, it measures heat or detects motion.
Some sensors only measure infrared light. However, others also detect movement or create thermal images.
How Does an Infrared Sensor Work?
Infrared (IR) gas sensors use light to find gases. Since each gas is different, it absorbs certain light waves.
As a result, gases leave a unique “fingerprint.” When light passes through, each gas absorbs a different amount. Then, the sensor measures the changes.
There are two main types:
- NDIR sensors – Use light, a gas chamber, and a detector. First, light moves through the gas. Then, the detector checks how much light remains. By comparing this, the sensor calculates gas levels.
- PAS sensors – Work differently but also detect gases with IR light.
Where Are Infrared Sensors Used?
Because they are useful, IR sensors appear in many places. For example:
- Security – Trigger alarms and cameras when they detect motion.
- Military – Help with night vision.
- Homes – Control lights, heating, and security based on movement.
- Factories – Track heat and motion to improve safety.
- Environment – Measure gas levels and pollution.
Popular Gas Detectors Featuring Infrared Sensors
Several leading gas detection devices incorporate infrared sensor technology, including:
• Honeywell BW Ultra
• Crowcon Gasman
• Blackline G7
• Blackline EXO 8
• Crowcon Gas – Pro
• Honeywell BW Flex
Download the ‘Understand Infrared Sensor’ guide today.
