Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process
The division process used in a DFB diode laser-based optical gas sensor was studied to improve the immunity to laser power variation. Residual amplitude modulation (RAM) in wavelength modulation spectroscopy (WMS) detection was eliminated by intensity normalization using a division process. As a res...
| Hauptverfasser: | , , , , , , |
|---|---|
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
MDPI AG
2015-04-01
|
| Schriftenreihe: | Sensors |
| Schlagworte: | |
| Online Zugang: | http://www.mdpi.com/1424-8220/15/4/9582 |
| _version_ | 1828115927933124608 |
|---|---|
| author | Hengtai Chang Jun Chang Qingjie Huang Qiang Wang Changbin Tian Wei Wei Yuanyuan Liu |
| author_facet | Hengtai Chang Jun Chang Qingjie Huang Qiang Wang Changbin Tian Wei Wei Yuanyuan Liu |
| author_sort | Hengtai Chang |
| collection | DOAJ |
| description | The division process used in a DFB diode laser-based optical gas sensor was studied to improve the immunity to laser power variation. Residual amplitude modulation (RAM) in wavelength modulation spectroscopy (WMS) detection was eliminated by intensity normalization using a division process. As a result the detected harmonic signals showed a significant improvement in line shape. For the first harmonic (1f) signal, Bias was improved from 38.7% to 1.2%; Baseline Difference was improved from 2.7% to 0.69% and Asymmetry was improved from 15.4% to 0.22%. For the second harmonic (2f) signal, the Asymmetry Coefficient was improved from 103% to 5.1%. Moreover the division process can further suppress the influence of unstable laser power. As a result, for the 1f signal, stable detection with a variation coefficient of 0.59% was obtained over a wide dynamic range (0.38–8.1 mW). For the 2f signal, stable detection with a variation coefficient of 0.53% was obtained from 0.64 mW to 8.27 mW. The test results showed a good agreement with the theoretical analysis and the proposed method has considerable potential application in gas sensing. |
| first_indexed | 2024-04-11T12:47:55Z |
| format | Article |
| id | doaj.art-d9f3f4b4d9b04d579b6236b51e9c1c0d |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T12:47:55Z |
| publishDate | 2015-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-d9f3f4b4d9b04d579b6236b51e9c1c0d2022-12-22T04:23:17ZengMDPI AGSensors1424-82202015-04-011549582959110.3390/s150409582s150409582Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division ProcessHengtai Chang0Jun Chang1Qingjie Huang2Qiang Wang3Changbin Tian4Wei Wei5Yuanyuan Liu6School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, ChinaSchool of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, ChinaThe division process used in a DFB diode laser-based optical gas sensor was studied to improve the immunity to laser power variation. Residual amplitude modulation (RAM) in wavelength modulation spectroscopy (WMS) detection was eliminated by intensity normalization using a division process. As a result the detected harmonic signals showed a significant improvement in line shape. For the first harmonic (1f) signal, Bias was improved from 38.7% to 1.2%; Baseline Difference was improved from 2.7% to 0.69% and Asymmetry was improved from 15.4% to 0.22%. For the second harmonic (2f) signal, the Asymmetry Coefficient was improved from 103% to 5.1%. Moreover the division process can further suppress the influence of unstable laser power. As a result, for the 1f signal, stable detection with a variation coefficient of 0.59% was obtained over a wide dynamic range (0.38–8.1 mW). For the 2f signal, stable detection with a variation coefficient of 0.53% was obtained from 0.64 mW to 8.27 mW. The test results showed a good agreement with the theoretical analysis and the proposed method has considerable potential application in gas sensing.http://www.mdpi.com/1424-8220/15/4/9582optical gas sensordivision processresidual amplitude modulationwavelength modulation spectroscopyunstable laser power |
| spellingShingle | Hengtai Chang Jun Chang Qingjie Huang Qiang Wang Changbin Tian Wei Wei Yuanyuan Liu Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process Sensors optical gas sensor division process residual amplitude modulation wavelength modulation spectroscopy unstable laser power |
| title | Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process |
| title_full | Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process |
| title_fullStr | Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process |
| title_full_unstemmed | Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process |
| title_short | Immunity to Laser Power Variation in a DFB Diode Laser Based Optical Gas Sensor Using a Division Process |
| title_sort | immunity to laser power variation in a dfb diode laser based optical gas sensor using a division process |
| topic | optical gas sensor division process residual amplitude modulation wavelength modulation spectroscopy unstable laser power |
| url | http://www.mdpi.com/1424-8220/15/4/9582 |
| work_keys_str_mv | AT hengtaichang immunitytolaserpowervariationinadfbdiodelaserbasedopticalgassensorusingadivisionprocess AT junchang immunitytolaserpowervariationinadfbdiodelaserbasedopticalgassensorusingadivisionprocess AT qingjiehuang immunitytolaserpowervariationinadfbdiodelaserbasedopticalgassensorusingadivisionprocess AT qiangwang immunitytolaserpowervariationinadfbdiodelaserbasedopticalgassensorusingadivisionprocess AT changbintian immunitytolaserpowervariationinadfbdiodelaserbasedopticalgassensorusingadivisionprocess AT weiwei immunitytolaserpowervariationinadfbdiodelaserbasedopticalgassensorusingadivisionprocess AT yuanyuanliu immunitytolaserpowervariationinadfbdiodelaserbasedopticalgassensorusingadivisionprocess |