Mid-infrared LEDs manufactured by GSS are used at the core of all GSS Non-Dispersive Infrared (NDIR) gas sensors.

The gas concentration is measured by shining this unique mid-infrared LED onto the target gas and detecting the amount of light absorbed by the gas using a unique optical system and optical sensor.

Achieve uncompromising sensor performance
As an example, CO2 gas is strongly absorbed by light outside 4.25um. The mid-infrared LEDs for CO2 gas manufactured by GSS are specially designed to emit narrow band light centered on 4.25 μm. By limiting the light other than the measurement wavelength, the measurement accuracy is improved and the power consumption is suppressed.

This solid-state technology ultra-low power LED light source provides low power consumption and is ideal for applications that run on battery power for years.

It works by measuring the amount of infrared light absorbed by CO2 gas. The more light that is absorbed, the more CO2 is present. This method is known as non-dispersive infrared (NDIR) gas sensing. Light is emitted from the LED, passes through CO2 gas, and is reflected by the gold optics. The reflected light is converted into an electric current by the photodiode. This output provides accurate CO2 measurements.