儀器概述
TILDAS-mini為大氣痕量氣體成分的在線觀測(cè)研究提供高靈敏、快速響應(yīng)、高精確度和連續(xù)運(yùn)行的測(cè)量手段。它使用單束激光,設(shè)計(jì)緊湊,體積小,經(jīng)濟(jì)實(shí)用。點(diǎn)擊查看儀器彩頁(yè)
圖1.QCL-mini 實(shí)物圖
它可以在線測(cè)量多種大氣痕量氣體,包括: 甲烷(methane, CH4), 氧化亞氮(nitrous oxide, N2O), 一氧化氮(nitric oxide, NO), 二氧化氮(nitrogen dioxide, NO2), 一氧化碳(carbon monoxide, CO), 二氧化碳(carbon dioxide, CO2), 甲醛(formaldehyde, HCHO), 甲酸(formic acid, HCOOH), 乙烯(ethylene, C2H4), 乙炔(acetylene, C2H4), 氧硫化碳(carbonyl sulfide, COS), 丙烯醛(acrolein, CH2CHCHO), 氨氣(ammonia, NH3)和其它痕量氣體;
下面列出了目前比較受歡迎的測(cè)量組合。更多測(cè)量組合請(qǐng)見(jiàn)痕量氣體組合清單。
應(yīng)用范圍
技術(shù)優(yōu)勢(shì)
技術(shù)指標(biāo)
TILDAS的中紅外激光提供高精度和高準(zhǔn)確性的測(cè)量手段.表中列出光程76米激光測(cè)試下每種成分的最優(yōu)波長(zhǎng)(cm-1)、標(biāo)稱測(cè)量精度(ppt/s)、檢出限(2σ/100s)。
Trace gas | Wavenumber [cm-1] |
Precision (1 s) [ppt] |
LOD (100 s) [ppt] |
CO N2O |
2190 1271 |
60 60 |
30 |
N2O NH3 |
2250 967 |
30 40 |
-- 20 |
NO2 HONO |
1600 1279 |
40 300 |
20 150 |
HCHO HCOOH |
1765 1766 |
100 200 |
60 120 |
NO OCS |
1900 2056 |
100 5 |
50 2 |
物理參數(shù)
尺寸/重量:660 mm x 440 mm x 267 mm (L x W x H)/主機(jī)重量: 35 kg
電源:500 W, 120/240 V, 50/60 Hz (連接Varian IDP-3型真空泵):
參考文獻(xiàn)
- 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).