Fig. 1. Absorption spectra of CO₂ and H₂O at 4.26 μm

Fig. 2. Schematic of infrared fire CO₂ alarming system

Fig. 3. Relationship between voltage ratio and CO₂ gas concentration

Fig. 4. Measured CO₂ concentration curve at static state

Fig. 5. Measured CO₂ concentration curve at vibrational state

Fig. 6. Fire alarming system and vibration reduction module

Fig. 7. Dynamic model with single degree of freedom

Fig. 8. Simulation vibration waveform by MATLAB software

Fig. 9. Measured vibration speed on highway under rough road conditions

Fig. 10. Measured vibration speed on highway

Fig. 11. Measured vibration speed on stone road

Fig. 12. CO₂ concentration curve at damping state