How sensitive are FLIR's gas detection cameras?

The sensitivity of optical gas imaging (OGI) cameras is extremely high, they can detect small gas leaks from several meters away and large leaks from hundreds of meters away. In addition, they show leaks in moving transport vehicles, such as tankers, ships and rail cars.

HSM HIGH SENSITIVITY MODE

With High Sensitivity Mode (HSM), operators can detect even the smallest leaks. High Sensitivity Mode is an image subtraction video processing technique that enhances the thermal sensitivity of the camera. HSM subtracts a percentage of individual frame pixel signals from the subsequent frame video sequence and enhances the differences between the frames, so leaks stand out more clearly in the resulting images. See HSM in action in the video below: 

CARBON DIOXIDE (CO2) VISUALIZATION

A common concern when imaging CO2 is whether or not the OGI camera detects the gas or sees water vapor.

cows-breathing-co2-sensitivity

Are we seeing the heat from the water vapor exhaled by the cow? No, we are actually seeing CO2 exhaled. 

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OGI cameras image the gas by spectral filtering for infrared absorption in a specific waveband. At 4.3 microns, water vapor does not absorb as much energy as CO2. When we (or cows) exhale, for example, an OGI camera with a 4.3 µm filter would detect the CO2 we exhale much more than any water vapor.

Learn more about how a filter in an infrared camera helps to visualize CO2:

For more information about FLIR's entire line of optical gas imaging cameras, visit www.apliter.com/ogi.

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