LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning Fork
A carbon dioxide (CO<sub>2</sub>) sensor based on light-induced thermoelastic spectroscopy (LITES) using a 2 μm diode laser and a self-designed low-frequency trapezoidal-head QTF is reported for the first time in this invited paper. The self-designed trapezoidal-head QTF with a low reson...
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2025-03-01
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| author | Junjie Mu Jinfeng Hou Shaoqi Qiu Shunda Qiao Ying He Yufei Ma |
| author_facet | Junjie Mu Jinfeng Hou Shaoqi Qiu Shunda Qiao Ying He Yufei Ma |
| author_sort | Junjie Mu |
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| description | A carbon dioxide (CO<sub>2</sub>) sensor based on light-induced thermoelastic spectroscopy (LITES) using a 2 μm diode laser and a self-designed low-frequency trapezoidal-head QTF is reported for the first time in this invited paper. The self-designed trapezoidal-head QTF with a low resonant frequency of 9464.18 Hz and a high quality factor (<i>Q</i>) of 12,133.56 can significantly increase the accumulation time and signal level of the CO<sub>2</sub>-LITES sensor. A continuous-wave (CW) distributed-feedback (DFB) diode laser is used as the light source, and the strongest absorption line of CO<sub>2</sub> located at 2004.01 nm is chosen. A comparison between the standard commercial QTF with the resonant frequency of 32.768 kHz and the self-designed trapezoidal-head QTF is performed. The experimental results show that the CO<sub>2</sub>-LITES sensor with the self-designed trapezoidal-head QTF has an excellent linear response to CO<sub>2</sub> concentration, and its minimum detection limit (MDL) can reach 46.08 ppm (parts per million). When the average time is increased to 100 s based on the Allan variance analysis, the MDL of the sensor can be improved to 3.59 ppm. Compared with the 16.85 ppm of the CO<sub>2</sub>-LITES sensor with the commercial QTF, the performance is improved by 4.7 times, demonstrating the superiority of the self-designed trapezoidal-head QTF. |
| format | Article |
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| spelling | doaj-art-24f303a6d23947978d6b4f0559c2bf2c2025-08-20T03:08:54ZengMDPI AGSensors1424-82202025-03-01257209910.3390/s25072099LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning ForkJunjie Mu0Jinfeng Hou1Shaoqi Qiu2Shunda Qiao3Ying He4Yufei Ma5National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Physics, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, ChinaNational Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, ChinaA carbon dioxide (CO<sub>2</sub>) sensor based on light-induced thermoelastic spectroscopy (LITES) using a 2 μm diode laser and a self-designed low-frequency trapezoidal-head QTF is reported for the first time in this invited paper. The self-designed trapezoidal-head QTF with a low resonant frequency of 9464.18 Hz and a high quality factor (<i>Q</i>) of 12,133.56 can significantly increase the accumulation time and signal level of the CO<sub>2</sub>-LITES sensor. A continuous-wave (CW) distributed-feedback (DFB) diode laser is used as the light source, and the strongest absorption line of CO<sub>2</sub> located at 2004.01 nm is chosen. A comparison between the standard commercial QTF with the resonant frequency of 32.768 kHz and the self-designed trapezoidal-head QTF is performed. The experimental results show that the CO<sub>2</sub>-LITES sensor with the self-designed trapezoidal-head QTF has an excellent linear response to CO<sub>2</sub> concentration, and its minimum detection limit (MDL) can reach 46.08 ppm (parts per million). When the average time is increased to 100 s based on the Allan variance analysis, the MDL of the sensor can be improved to 3.59 ppm. Compared with the 16.85 ppm of the CO<sub>2</sub>-LITES sensor with the commercial QTF, the performance is improved by 4.7 times, demonstrating the superiority of the self-designed trapezoidal-head QTF.https://www.mdpi.com/1424-8220/25/7/2099carbon dioxide (CO<sub>2</sub>)quartz tuning forklight-induced thermoelastic spectroscopy (LITES)gas sensing |
| spellingShingle | Junjie Mu Jinfeng Hou Shaoqi Qiu Shunda Qiao Ying He Yufei Ma LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning Fork Sensors carbon dioxide (CO<sub>2</sub>) quartz tuning fork light-induced thermoelastic spectroscopy (LITES) gas sensing |
| title | LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning Fork |
| title_full | LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning Fork |
| title_fullStr | LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning Fork |
| title_full_unstemmed | LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning Fork |
| title_short | LITES-Based Sensitive CO<sub>2</sub> Detection Using 2 μm Diode Laser and Self-Designed 9.5 kHz Quartz Tuning Fork |
| title_sort | lites based sensitive co sub 2 sub detection using 2 μm diode laser and self designed 9 5 khz quartz tuning fork |
| topic | carbon dioxide (CO<sub>2</sub>) quartz tuning fork light-induced thermoelastic spectroscopy (LITES) gas sensing |
| url | https://www.mdpi.com/1424-8220/25/7/2099 |
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