Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism
A right-angle prism was used to enhance the acoustic signal of a quartz-enhanced photoacoustic spectroscopy (QEPAS) system. The incident laser beam was parallelly inverted by the right-angle prism and passed through the gap between two tuning fork prongs again to produce another acoustic excitation....
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-02-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/16/2/214 |
| _version_ | 1811187194321174528 |
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| author | Yongning Liu Jun Chang Jie Lian Zhaojun Liu Qiang Wang Zengguang Qin |
| author_facet | Yongning Liu Jun Chang Jie Lian Zhaojun Liu Qiang Wang Zengguang Qin |
| author_sort | Yongning Liu |
| collection | DOAJ |
| description | A right-angle prism was used to enhance the acoustic signal of a quartz-enhanced photoacoustic spectroscopy (QEPAS) system. The incident laser beam was parallelly inverted by the right-angle prism and passed through the gap between two tuning fork prongs again to produce another acoustic excitation. Correspondingly, two pairs of rigid metal tubes were used as acoustic resonators with resonance enhancement factors of 16 and 12, respectively. The QEPAS signal was enhanced by a factor of 22.4 compared with the original signal, which was acquired without resonators or a prism. In addition, the system noise was reduced a little with double resonators due to the Q factor decrease. The signal-to-noise ratio (SNR) was greatly improved. Additionally, a normalized noise equivalent absorption coefficient (NNEA) of 5.8 × 10−8 W·cm−1·Hz−1/2 was achieved for water vapor detection in the atmosphere. |
| first_indexed | 2024-04-11T13:57:58Z |
| format | Article |
| id | doaj.art-70ba5274c3f1448a8a8e6defb1ddec85 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T13:57:58Z |
| publishDate | 2016-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-70ba5274c3f1448a8a8e6defb1ddec852022-12-22T04:20:11ZengMDPI AGSensors1424-82202016-02-0116221410.3390/s16020214s16020214Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle PrismYongning Liu0Jun Chang1Jie Lian2Zhaojun Liu3Qiang Wang4Zengguang Qin5School of Information Science and Engineering, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering, Shandong University, Jinan 250100, ChinaA right-angle prism was used to enhance the acoustic signal of a quartz-enhanced photoacoustic spectroscopy (QEPAS) system. The incident laser beam was parallelly inverted by the right-angle prism and passed through the gap between two tuning fork prongs again to produce another acoustic excitation. Correspondingly, two pairs of rigid metal tubes were used as acoustic resonators with resonance enhancement factors of 16 and 12, respectively. The QEPAS signal was enhanced by a factor of 22.4 compared with the original signal, which was acquired without resonators or a prism. In addition, the system noise was reduced a little with double resonators due to the Q factor decrease. The signal-to-noise ratio (SNR) was greatly improved. Additionally, a normalized noise equivalent absorption coefficient (NNEA) of 5.8 × 10−8 W·cm−1·Hz−1/2 was achieved for water vapor detection in the atmosphere.http://www.mdpi.com/1424-8220/16/2/214right-angle prismQEPASgas detectionDFB-LD |
| spellingShingle | Yongning Liu Jun Chang Jie Lian Zhaojun Liu Qiang Wang Zengguang Qin Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism Sensors right-angle prism QEPAS gas detection DFB-LD |
| title | Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism |
| title_full | Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism |
| title_fullStr | Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism |
| title_full_unstemmed | Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism |
| title_short | Quartz-Enhanced Photoacoustic Spectroscopy with Right-Angle Prism |
| title_sort | quartz enhanced photoacoustic spectroscopy with right angle prism |
| topic | right-angle prism QEPAS gas detection DFB-LD |
| url | http://www.mdpi.com/1424-8220/16/2/214 |
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