发明名称 |
CAVITY ENHANCED TRACE GAS DETECTION GRADIOMETER |
摘要 |
A method and device for measuring trace levels of particles in an air sample is described. A device operating in a gradiometer configuration with two cavities built from a monolithic structure and utilizing a single probe laser, provides common mode subtraction of acoustic, vibrational, laser intensity and other noise sources, which allows sensitivity more closely approaching the quantum limit. Differential measurements between the two cavities occur simultaneously, which reduces errors due to cavity drift. Absorptive gradiometry can therefore provide noise immune detection for trace gasses, including broad linewidth absorbers where frequency-noise immune schemes are not practical. Differential measurements can be used for background subtraction, sensing vapor plume gradients and determining vapor plume propagation direction. |
申请公布号 |
WO2010042178(A2) |
申请公布日期 |
2010.04.15 |
申请号 |
WO2009US05495 |
申请日期 |
2009.10.07 |
申请人 |
ENTANGLEMENT TECHNOLOGIES, LLC;TUCHMAN, ARI, K.;STOCKTON, JOHN, K. |
发明人 |
TUCHMAN, ARI, K.;STOCKTON, JOHN, K. |
分类号 |
G01N21/39;G01N33/497 |
主分类号 |
G01N21/39 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|