压电管作为气相光声的共振换能器。

Piezoelectric tube as resonant transducer for gas-phase photoacoustics.

机构信息

University of Basel, Department of Chemistry, Klingelbergstrasse 80, 4056, Basel, Switzerland; Department of General Sciences, King Mongkut's Institute of Technology Ladkrabang, Prince of Chumphon Campus, Chumphon, 86160, Thailand.

University of Basel, Department of Chemistry, Klingelbergstrasse 80, 4056, Basel, Switzerland.

出版信息

Anal Chim Acta. 2021 Feb 22;1147:165-169. doi: 10.1016/j.aca.2020.12.063. Epub 2020 Dec 30.

DOI:10.1016/j.aca.2020.12.063

PMID:33485575

Abstract

The use of a piezoelectric tube for the photoacoustic gas-phase determination of NO as a model analyte is demonstrated. The tube is made from lead zirconate titanate with 30 mm length and 5.35 mm internal diameter. Its inner and outer surfaces are coated with electrodes. The tube serves as both, resonance body and transducer. The design is thus simpler than the usual combination of resonance tube and microphone as the two functions are embodied in the same component. The main resonance frequency of the tube was found to be 5341 Hz. A blue laser diode emitting at 450 nm was employed as light source for the determination of NO. The limit of detection was determined as 83 ppbV and the calibration curve was linear with a coefficient of determination (r) of 0.9998 up to the highest concentration of 15 ppmV tested.

摘要

利用压电管进行光声气相法测定 NO 作为模型分析物的实验得到了验证。该管由锆钛酸铅制成，长度为 30mm，内径为 5.35mm。其内外表面均涂有电极。该管既是共振体又是换能器。因此，与通常的共振管和麦克风组合相比，设计更为简单，因为两个功能都包含在同一个组件中。该管的主共振频率被发现为 5341Hz。使用发射波长为 450nm 的蓝色激光二极管作为测定 NO 的光源。检测限确定为 83ppbV，校准曲线在测试的最高浓度 15ppmV 范围内呈线性，相关系数(r)为 0.9998。