Auto-digital gain balancing: a new detection scheme for high-speed chemical species tomography of minor constituents
Auto-digital gain balancing: a new detection scheme for high-speed chemical species tomography of minor constituents
复制标题
自动数字增益平衡:微量成分高速化学物质断层扫描的新检测方案
DOI:
10.1088/0957-0233/22/11/115304
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发表时间:
2011
影响因子:
2.4
通讯作者:
Pal S
中科院分区:
文献类型:
--
作者:
Pal S
In many dynamic gas-phase reaction processes, there is great interest to measure the distribution of minor constituents, ie< 10− 3 by volume (1000 ppm). One such case is the after-treatment of automotive gasoline engine exhaust by catalytic conversion, where a characteristic challenge is to image the distribution of 10 ppm (average) of carbon monoxide (CO) at 1000 frames per second across a 50 mm diameter exhaust pipe; this particular problem has been pursued as a case study. In this paper, we present a novel electronic scheme that achieves the required measurement of around 10− 3 absorption with 10− 4 precision at kHz bandwidth. This was not previously achievable with any known technology. We call the new scheme Auto-Digital Gain Balancing. It is amenable to replication for many simultaneous measurement channels, and it permits simultaneous measurement of multiple species, in some circumstances. Experimental demonstrations are presented in the near-infrared. In single scans of a tunable diode laser, measurements of both CO and CO 2 have been made with 20 dB signal-to-noise ratio at peak absorption. This work paves the way for chemical species tomography of minor constituents in many dynamic gas-phase systems.
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DOI:
10.1109/icecs.2008.4674989
发表时间:
2008
期刊:
2008 15th IEEE International Conference on Electronics, Circuits and Systems
影响因子:
--
作者:
S. Pal;P. Wright;H. McCann
通讯作者:
H. McCann
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
D. Sonnenfroh;W. Rawlins;M. Allen;C. Gmachl;F. Capasso;A. L. Hutchinson;D. Sivco;J. Baillargeon;A. Cho
通讯作者:
A. Cho
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
C. Sutela;N. Collings;T. Hands
通讯作者:
T. Hands
DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
D. Schweich;J. Leclerc
通讯作者:
J. Leclerc
影响因子:
4.3
作者:
S. So;G. Wysocki;J. P. Frantz;F. Tittel
通讯作者:
F. Tittel