儀器概述
TILDAS-dual采用了兩重量子級聯(lián)激光，可以同時在線測量多種大氣痕量氣體成分。具有高靈敏度、高精度、連續(xù)、快速測量的特點。點擊查看儀器彩頁。
圖1.QCL-dual 實物圖
對多種痕量大氣成分具有極高的靈敏度：甲烷、一氧化二氮、氧化亞氮、二氧化氮、一氧化碳、二氧化碳、甲醛(formaldehyde), 甲酸(formic acid), 乙烯(ethylene), 乙炔(acetylene), 氧硫化碳(carbonyl sulfide), 丙烯醛(acrolein), 氨氣(ammonia, NH3）和其它氣體；
下面列出了目前比較受歡迎的測量組合。更多測量組合請見痕量氣體組合清單。
應用范圍
技術優(yōu)勢
技術指標
TILDAS的中紅外激光提供高精度和高準確性的測量手段.表中列出部分光程210米激光測試下每種成分的最優(yōu)波長(cm-1)、標稱測量精度(ppt/s)、檢出限(2σ/100s)。詳細指標見各儀器彩頁。
| Trace gas | Wavenumber [cm-1] | Precision (1 s) [ppt] | LOD (100 s) [ppt] |
|---|---|---|---|
| CH4 | 1271 | 200 | -- |
| CO | 2190 | 20 | 10 |
| N2O | 1271 | 60 | -- |
| N2O | 2250 | 30 | -- |
| NH3 | 967 | 20 | 10 |
| NO2 | 1600 | 10 | 5 |
| HONO | 1279 | 150 | 80 |
| HCHO | 1765 | 50 | 20 |
| HCOOH | 1766 | 80 | 40 |
| NO | 1900 | 40 | 20 |
| C2H6 | 2990 | 20 | 10 |
| OCS | 2056 | 2 | 1 |
物理參數
尺寸/重量：770 mm x 560 mm x 640 mm (L x W x H)/主機重量: 75 kg
電源：250-500 W, 120/240 V, 50/60 Hz (連接Varian IDP-3型真空泵)
參考文獻
- Nelson, D.D. et al., Optics Let.31, 2012-2014, 2006.
- McManus, J.B. et al., Applied Physics B, DOI: 10.1007/s00340-006-2407-7 (2006).
- McManus, J.B., M.S. Zahniser, D.D. Nelson, L.R. Williams, and C.E. Kolb, Infrared laser spectrometer with balanced absorption for measurements of isotopic ratios of carbon gases, Spectrochim. Acta A,58, 2465-2479, (2002).
- McManus, J.B., D.D. Nelson, J.H. Shorter, R. Jiménez, S. Herndon, S. Saleska, and M.S. Zahniser, A high precision pulsed QCL spectrometer for measurements of stable isotopes of carbon dioxide, J. Modern Optics,52, 2309-2321 (2005).
- Saleska, SR; J. Shorter, S. Herndon, R. Jimenéz, B. McManus, D. Nelson, M. Zahniser, What are the instrumentation requirements for measuring the isotopic composition of net ecosystem exchange of CO2 using eddy covariance methods? Isotopes in Environmental and Health Studies,42 (1), 117 (2006).
- Nelson, D.D., J. B. McManus, S. C. Herndon, M. S. Zahniser, B. Tuzson and L. Emmenegger, New Method for Isotopic Ratio Measurements of Atmospheric Carbon Dioxide Using a 4.3 μm Pulsed Quantum Cascade Laser, Appl. Phys. B90, 301–309 (2008).
- Tuzson, B , J. Mohn, M. J. Zeeman, R. A. Werner, W. Eugster, M. S. Zahniser, D. D. Nelson, J. B. McManus, L. Emmenegger, High precision and continuous field measurements of δ13C and δ18O in carbon dioxide with a cryogen-free QCLAS, Appl. Phys. B92, 451-458 (2008).