Fig. 1. System block diagram of agricultural fire detector based on NDIR Technology

Fig. 2. The measured volume fraction curve of atmospheric CO₂ concentration level within 0 ℃~40 ℃

Fig. 3. Structure block diagram of temperature control system of the infrared pyroelectric detector

Fig. 4. PT100 wiring diagram

Fig. 5. Buck circuit schematic diagram

Fig. 6. The real object of the temperature control system and the thermostat simulates the ambient temperature

Fig. 7. Response time of the temperature control system and the recorded detector temperature during experiment

Fig. 8. Sensor system calibration

Fig. 9. CO₂ volume fraction is 0 at ambient temperature -40 ℃ and detector 21 ℃ stability test and Allan standard deviation curve

Fig. 10. CO₂ concentration and detector temperature measured at high temperature