| DOI: | 10.2172/1044815
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| 报告号: | DOE/10SC000316
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| 报告题名: | Final Scientific/Technical Report. A closed path methane and water vapor gas analyzer |
| 作者: | Xu, Liukang [LI-COR Inc., Lincoln, NE (United States)]; McDermitt, Dayle [LI-COR Inc., Lincoln, NE (United States)]; Anderson, Tyler [LI-COR Inc., Lincoln, NE (United States)]; Riensche, Brad [LI-COR Inc., Lincoln, NE (United States)]; Komissarov, Anatoly [LI-COR Inc., Lincoln, NE (United States)]; Howe, Julie [LI-COR Inc., Lincoln, NE (United States)]
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| 出版年: | 2012
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| 发表日期: | 2012-02-01
|
| 总页数: | 50
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| 国家: | 美国
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| 语种: | 英语
|
| 英文关键词: | Closed-path methane analyzer
; closed-path water vapor gas analyzer
|
| 中文主题词: | 大气科学
; 碳
; 吸收
; 潮湿
; 水蒸汽
; 二氧化碳
; 吸附作用
; 甲烷
|
| 主题词: | ATMOSPHERE
; CARBON
; ABSORPTION
; HUMIDITY
; WATER VAPOR
; CARBON DIOXIDE
; METHANE
|
| 英文摘要: | Robust, economical, low-power and reliable closed-path methane (CH4), carbon dioxide (CO2), and water vapor (H2O) analyzers suitable for long-term measurements are not readily available commercially. Such analyzers are essential for quantifying the amount of CH4 and CO2 released from various ecosystems (wetlands, rice paddies, forests, etc.) and other surface contexts (e.g. landfills, animal husbandry lots, etc.), and for understanding the dynamics of the atmospheric CH4 and CO2 budget and their impact on climate change and global warming. The purpose of this project is to develop a closed-path methane, carbon dioxide gas and water vapor analyzer capable of long-term measurements in remote areas for global climate change and environmental research. The analyzer will be capable of being deployed over a wide range of ecosystems to understand methane and carbon dioxide exchange between the atmosphere and the surface. Measurements of methane and carbon dioxide exchange need to be made all year-round with limited maintenance requirements. During this Phase II effort, we successfully completed the design of the electronics, optical bench, trace gas detection method and mechanical infrastructure. We are using the technologies of two vertical cavity surface emitting lasers, a multiple-pass Herriott optical cell, wavelength modulation spectroscopy and direct absorption to measure methane, carbon dioxide, and water vapor. We also have designed the instrument application software, Field Programmable Gate Array (FPGA), along with partial completion of the embedded software. The optical bench has been tested in a lab setting with very good results. Major sources of optical noise have been identified and through design, the optical noise floor is approaching -60dB. Both laser modules can be temperature controlled to help maximize the stability of the analyzer. Additionally, a piezo electric transducer has been utilized to randomize the noise introduced from potential etalons. It is expected that all original specifications contained within the initial proposal will be met. We are currently in the beginning stages of assembling the first generation prototypes and finalizing the remaining design elements. The first prototypes will initially be tested in our environmental calibration chamber in which specific gas concentrations, temperature and humidity levels can be controlled. Once operation in this controlled setting is verified, the prototypes will be deployed at LI-COR's Experimental Research Station (LERS). Deployment at the LERS site will test the instrument's robustness in a real-world situation. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1044815
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40758
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1044815.pdf（2877KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Xu, Liukang [LI-COR Inc., Lincoln, NE ,McDermitt, Dayle [LI-COR Inc., Lincoln, NE ,Anderson, Tyler [LI-COR Inc., Lincoln, NE ,et al. Final Scientific/Technical Report. A closed path methane and water vapor gas analyzer. 2012-01-01.
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