Qi-xin HE, Jia-kun LI, Qi-bo FENG. Development of a Mid-Infrared Cavity Enhanced Formaldehyde Detection System[J]. Spectroscopy and Spectral Analysis, 2021, 41(7): 2077
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 7, 2077 (2021)
Fig. 1. Absorption spectrum of H2CO (1 mL·L-1) around 3.6 μm
Fig. 2. Tuning characteristics of the ICL
Fig. 3. Structure of the cavity enhanced H2CO detection system
EOM: Electro-optic phase modulator; PBS: Polarizing beam splitter; PZT: Piezoelectric transducer; PD: Photodiode detector
EOM: Electro-optic phase modulator; PBS: Polarizing beam splitter; PZT: Piezoelectric transducer; PD: Photodiode detector
Fig. 4. The error signal and the cavity transmitted signal
Fig. 5. The cavity transmission signal with PDH dynamic locking
Fig. 6. (a) The measured signal of H2CO (10 mL·L-1); (b) Absorption spectrum of H2CO (1 mL·L-1)
Fig. 7. Relation between the amplitude of the cavity transmission signal and the concentration
Fig. 8. The Allan variance analysis
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