photodiode

Exhaust gas analysis

LEDs are used in exhaust gas analysis in the following ways: 1. **Non-Dispersive Infrared (NDIR) Analysis**: Infrared LEDs emitting specific wavelengths are used in NDIR sensors. For example, to detect carbon monoxide (CO) in exhaust gases, LEDs emitting around 4.6 - 4.7 µm are commonly employed. For carbon dioxide (CO₂) detection, LEDs with wavelengths around 4.2 - 4.3 µm are used. 2. **Chemiluminescence Detection**: In the analysis of nitrogen oxides (NOx) in exhaust, ultraviolet LEDs are used to initiate chemiluminescent reactions. These LEDs typically emit in the ultraviolet range (e.g., 365 - 400 nm). 3. **Optical Particle Sensing**: LEDs can also be used to illuminate the exhaust stream to measure the particle matter (PM) content. By scattering the light from the LEDs, the number and size of the particles in the exhaust can be determined. 4. **Flame Ionization Detection (FID)**: While not directly involved in the ionization process, LEDs can be used for indicator lights or in control circuits of FID-based systems used for hydrocarbon detection in exhaust gases.

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