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Proceedings Paper

The investigation of liquid analysis method based on fiber micro-drop sensor
Author(s): Weimin Sun; Xiaomei Li; Youmin Zeng
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Paper Abstract

A portable and practical fiber micro-drop sensor, with which can determine the refractive index and the concentration of the liquid, has be designed and realized. The advantages of this sensors combines simplicity of structure, facility of operation, wide range of measurement and low price. Liquid drops formed at the tip of a liquid sensing head are measured by a fiber sensor. The fiber sensor works as follows: infrared light source is injected into the drop through an optical fiber and the total internal reflections and absorptions are detected by a photo detector. A drop speed independent one-dimensional waveform, fiber fingerprint drop trace (FFDT), is generated. Liquid surface tension, refractive index and dielectric constant can be estimated from the fingerprint. For the effective use of the sensor, a new on-line method of liquid drop analysis is proposed, which is used for liquid discrimination with the orderliness of the fiber fingerprint drop trace. To compare two fingerprints effectively, signal analysis is required. Comparing fiber fingerprint drop trace, which might cause peaks and valleys in the trace at almost the same wavelet, digital signals process is more intuitionist. Analyzing every part of the fingerprint drop trace with impactful signal analysis method, as Fast Fourier Transform algorithm and correlative analysis, some orderliness can be revealed. Colligating the orderliness, we can discriminate all kinds of liquids or their characteristic parameters, such as liquid concentration, refractive index and so on.

Paper Details

Date Published: 5 March 2007
PDF: 6 pages
Proc. SPIE 6595, Fundamental Problems of Optoelectronics and Microelectronics III, 65952S (5 March 2007); doi: 10.1117/12.725905
Show Author Affiliations
Weimin Sun, Harbin Engineering Univ. (China)
Xiaomei Li, Harbin Engineering Univ. (China)
Youmin Zeng, Harbin Engineering Univ. (China)


Published in SPIE Proceedings Vol. 6595:
Fundamental Problems of Optoelectronics and Microelectronics III

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