Shoulin Jiang, Wei Jin, Feifan Chen, Shoufei Gao, Hoi Lut Ho. Carbon Dioxide Detection with High Sensitivity Based on Photo-Thermal Spectroscopy in Hollow-Core Optical Fiber[J]. Acta Optica Sinica, 2021, 41(13): 1306004
- Acta Optica Sinica
- Vol. 41, Issue 13, 1306004 (2021)
Fig. 1. Calculated absorption lines of CO2 and H2O at 296 K and 1.01×105 N/m2 from HITRAN2016
Fig. 2. Photo-thermal gas detection system. (a) Experimental setup; (b) SEM image of HC-ARF; (c) F-P gas cell
Fig. 3. Reflection spectra of the fabricated F-P cavities with low quality factors
Fig. 4. Effect of modulation depth and modulation frequency on the amplitude of the signal. (a) Relationship between the normalized amplitude and modulation depth with 10 kHz modulation frenquency; (b) frequency response of the normalized amplitude and noise with 0.14 cm-1 modulation depth
Fig. 5. Influence of AR coating on the rear end face. (a) 2f spectra at V(CO2)=10-4; (b) noise with pure N2
Fig. 6. Detection performance of CO2 concentration. (a) 2f spectrum at V(CO2)=10-5; (b) 2f signal amplitude at different volume fractions
Fig. 7. Measuremental results of the CO2 standard gas within 1 h at V(CO2)=10-5. (a) 2f spectrum; (b) peak-to-peak value
Fig. 8. Influence of pump power on the 2f signal amplitude/noise. (a) 2f signal spectra at V(CO2)=10-4; (b) relationship between the 2f signal amplitude/noise and the pump power
Fig. 9. Influence of intensity noise and phase noise. (a) Relationship between the noise and received power in 15-cm-long gas cell; (b) relationship between the noise and F-P cavity length with received power of 620 μW
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