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30 September 2003 Liquid drop analysis using photonic sensors
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Proceedings Volume 5264, Optomechatronic Systems IV; (2003)
Event: Photonics Technologies for Robotics, Automation, and Manufacturing, 2003, Providence, RI, United States
This paper describes a multispectral liquid drop analyzer for liquid chemical and physical properties analysis. Liquid drops formed at the tip of a liquid head are measured in parallel by a fiber sensor and a capacitive sensor. The fiber sensor works as follows: multispectral light sources are injected into the drop through an optical fiber and the total internal reflections and absorptions are detected by a photodetector. By combining fiber and capacitive sensor outputs, a drop speed independent one-dimensional waveform (liquid fingerprint) is generated. Liquid surface tension, refractive index and di-electric constant can be estimated from the fingerprint. To compare two fingerprints, the sensor outputs are normalized to have the same unit of measurement and drop starting position. After that, a reference liquid based calibration is applied to correct of fingerprint distortion due to variations in environment conditions, such as changes in temperature and humidity. Finally, a normalized correlation algorithm analyses the fingerprint difference. The repeatability and sensitivity of the system are demonstrated using different liquid samples. On-line applications show that the analyzer is able to detect 2% change in alcohol density.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jian Xu, Z. R. Qiu, Z. P. Fang, Qing Sung, Ivan Reading, and Xiang Li "Liquid drop analysis using photonic sensors", Proc. SPIE 5264, Optomechatronic Systems IV, (30 September 2003);

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