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Research on Short NIR Spectroscopy Applying to Flammable Liquid Detection

Author: WuJuan
Tutor: XuKeXin
School: Tianjin University
Course: Measuring Technology and Instruments
Keywords: Near Infrared Spectroscopy Liquid hazardous materials Discriminant analysis Security check Site testing
CLC: TH744.1
Type: Master's thesis
Year: 2007
Downloads: 152
Quote: 0
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Abstract


With the changing of the current international environment, security issues become increasingly prominent. The widely used security equipment are generally based on the principle of X-ray imaging to carry passengers wrapped with explosive liquid dangerous goods (such as alcohol, gasoline, kerosene, methanol, etc.) check mostly use visual and The odor detection methods, the use of new means and methods of detection of liquid dangerous goods in category is today the most popular research topics in the field. Near Infrared Spectroscopy with high sensitivity, fast response, for on-site rapid testing and real-time online analysis. View of the actual situation, short-wave near infrared spectroscopy on-site rapid detection of liquid. In this paper, the the transmission analysis techniques in the United States Ocean Optics USB2000 spectrometer background container. Measurement band from 350nm-1000nm, trying to find a suitable wavelength in this band. First measurement of the the original transmittance spectra of the various containers, and the absorbance of the container when the air as a background, the measurement results compare to determine a suitable band (739nm-1000nm); were measured for the water to the container as a background identified by the container and to the air as a background when the absorbance the liquid absorbance measurement is not within the range of the selected band. Infrared spectrometer Bruker, Germany measured over anhydrous ethanol, anhydrous methanol, ammonia, turpentine, gasoline, diesel, kerosene, and other liquid dangerous substance and part of the liquor, beverages absorption spectrum in the short-wave near-infrared range (667-1000nm) Savitzky-Golay convolution smoothing the original absorption spectrum is smoothed to remove high-frequency noise signal interference, baseline correction deducted instrument background or drift effect on the signal, the data normalization and preprocessing, this paper is The qualitative data analysis, the modern common statistical software SPSS discriminant analysis to seek the wavelength of the feature points, and selected feature wavelength predictive modeling. Based on this model using three wavelengths (981nm, 935nm, 881nm) can be flammable liquids accurate discrimination. This conduct on-site safety inspections by by three wavelength semiconductor laser (LD) or light emitting diodes (LED) as the light source, low-cost spectrum device flammable liquids to improve the accuracy and efficiency of the security, effective protection of public safety.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments > Spectrometers
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