Infrared and Laser Engineering, Volume. 51, Issue 9, 20210925(2022)
Wavelength selection and detection performance of DIAL for formaldehyde gas detection
Figures & Tables(12)
Fig. 1. System structure of DIAL for formaldehyde gas concentration detection
Fig. 5. Simulated detection results of formaldehyde at different heights and concentrations
Fig. 6. Effects of different formaldehyde concentrations on echo signal power and detection distance
Fig. 7. Simulation inversion errors corresponding to different formaldehyde concentrations
Table 1. Absorption cross section of formaldehyde, vapor and methane
View tableView in ArticleTable 1. Absorption cross section of formaldehyde, vapor and methane
Absorption cross section/cm2·molecule−1 Formaldehyde Vapor Methane ${\sigma _{{\rm{on}}} }$ ${\text{2} }{\text{.907 190 05} } \times {10^{ - 19} }$ ${\text{1} }{\text{.401 362 6} } \times {10^{ - 26} }$ ${\text{4} }{\text{.958 401 5} } \times {10^{ - 22} }$ ${\sigma _{\rm off} }$ ${\text{1} }{\text{.551 551 58} } \times {10^{ - 19} }$ ${\text{9} }{\text{.131 776 4} } \times {10^{ - 27} }$ ${\text{7} }{\text{.142 580 7} } \times {10^{ - 22} }$
Table 2. System parameters of DIAL
View tableView in ArticleTable 2. System parameters of DIAL
Parameter Value Laser wavelength/cm−1 λon: 2 778.48 λoff: 2 777.51 Pulse energy/mJ 1 Detector bandwidth/MHz 5 Detect active area/mm2 1×1 Pulse width/ns 25 Pulse repetition frequency/Hz 250 Laser divergence angle/mrad <1 Detector type VIGO-PVI-4 TE-4 Detector sensitivity/A·W−1 ≥1 Receiving area diameter 300 Telescope type MEADE-LX600-ACF12 Occlusion ratio 16.86%
Table 3. Performance parameters of VIGO-PVI-4 TE-4
View tableView in ArticleTable 3. Performance parameters of VIGO-PVI-4 TE-4
Parameter Detector：VIGO-PVI-4 TE-4 Material HgCdTe Optium wavelength ${\lambda _{\rm opt} }$ /$\text µ{\text{m} }$ 2.2-4.2 Detectivity $ {D^*} $ /$\rm cm \cdot H{z^{1/2} }\cdot W^{-1}$ $ \geqslant 6.0 \times {10^{11}} $ Current responsivity Ri/A·W−1 $ \geqslant 1.0 $ Time constant t/ns $ \leqslant 100 $ Resistance-optical area product $ R \cdot A $ /$\Omega \cdot \rm c{m^{-2}}$ $ \geqslant 800 $ Optical area A/ $\rm mm^2$ 1
Tools
Get Citation
Copy Citation Text
Wenhui Xin, Yuanshuo Bi, Shichun Li, Yaofei Li, Dengxin Hua. Wavelength selection and detection performance of DIAL for formaldehyde gas detection[J]. Infrared and Laser Engineering, 2022, 51(9): 20210925
Paper Information
Category: Lasers & Laser optics
Received: Dec. 21, 2021
Accepted: --
Published Online: Jan. 6, 2023
The Author Email:
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20