Orthogonal Demodulation Pound-Drever-Hall Technique for Ultra-Low Detection Limit Pressure Sensing
Orthogonal Demodulation Pound-Drever-Hall Technique for Ultra-Low Detection Limit Pressure Sensing
复制标题
用于超低检测限压力传感的正交解调 Pound-Drever-Hall 技术
DOI：
10.3390/s19143223
复制
发表时间：
2019-07-12
期刊：
影响因子：
3.9
通讯作者：
Xu, Lei
中科院分区：
文献类型：
--
作者：
Hu, Jinliang;Liu, Sheng;Xu, Lei
提出了一种基于正交解调的Pound-Drever-Hall（PDH）技术的光学微腔传感方案。我们发现，在较宽的腔品质因数（Q）范围内，可以获得较大的灵敏度。以微泡谐振器（MBR）压力传感为例，实现了比传统波长偏移检测方法更低的检测限。当膜生物反应器腔体Q值为10（5）~ 10（6）时，该技术可使检测限降低一至两个数量级。在850 nm波长处，压频灵敏度为11.6 GHz/bar，检测限可达0.0515 mbar。该技术也可应用于其他类型的微腔传感器，以提高传感性能。
We report on a novel optical microcavity sensing scheme by using the orthogonal demodulation Pound-Drever-Hall (PDH) technique. We found that larger sensitivity in a broad range of cavity quality factor (Q) could be obtained. Taking microbubble resonator (MBR) pressure sensing as an example, a lower detection limit than the conventional wavelength shift detection method was achieved. When the MBR cavity Q is about 10(5)-10(6), the technique can decrease the detection limit by one or two orders of magnitude. The pressure-frequency sensitivity is 11.6 GHz/bar at wavelength of 850 nm, and its detection limit can approach 0.0515 mbar. This technique can also be applied to other kinds of microcavity sensors to improve sensing performance.