Xu LIU, Peng-shuai SUN, Xi YANG, Tao PANG, Hua XIA, Bian WU, Zhi-rong ZHANG, Zhi-feng SHU, Chi-min SHU. High Precision Temperature Control Design for TDLAS Gas Detection System[J]. Acta Photonica Sinica, 2020, 49(12): 93
- Acta Photonica Sinica
- Vol. 49, Issue 12, 93 (2020)
Fig. 1. System design scheme
Fig. 2. Bootstrap current source
Fig. 3. PT00 Resistance-temperature characteristic curve
Fig. 4. Dual channel temperature acquisition and conditioning circuit
Fig. 5. TEC temperature control system
Fig. 6. System software diagram
Fig. 7. PID control diagram
Fig. 8. Schematic of internal structure of temperature control box
Fig. 9. Temperature control experimental system
Fig. 10. Stability of temperature control system at 35℃
Fig. 11. Change curves of measured values of temperature and concentration
Fig. 12. 1-hour variation curves of 7 different temperature sets
Fig. 13. Concentration and second harmonics at relative steady state
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Table 1. Selected temperature parameters in the stable period
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