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Raman Instrumentaion
Diagram of the System
Sample Characteristics
Instrumentation Stability
Instrument Calibration
(Click on pictures for a high quality version)
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Diagram of the System Top
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A diagram of the components of the fiber-coupled diode laser Raman system. The components include: the computer and interface electronics, the diode laser, the f/1.4 spectrograph, the CCD array, the collection fiber bundle, and the remote sample cell.
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Sample Characteristics Top
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| Spectrum Resolution High vs. Low in Gasoline |
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| A spectrum of unleaded premium gasoline obtained with 2 wavenumber resolution compared with a gasoline spectrum obtained with 30 wavenumber resolution. The individual components easily distinquishable with 2 wavenumber resolution are washed out at 30 wavenumber resolution |
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Near-IR Absorbance Spectra: Five Unleaded Gasolines |
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| Five near-IR absorbance spectra of different unleaded gasolines. The change in the spectra are very small requiring chemometrics to pull the differences out of the data. |
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Unleaded Premium Gasoline Spectrum: High Resolution Spectrum |
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| A spectrum of unleaded premium gasoline showing some primary components. The primary components shown are: m-xylene, o-xylene, iso-octane, ethyl benzene, toluene, p-xylene, and benzene. |
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Sample Fluorescence: Unleaded Premium Gasoline |
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| Comparison of a spectrum of unleaded premium gasoline for a variety of wavelengths from 488 nm to 852 nm. The fluorescence background of the gasoline sample decreases significantly with increasing excitation wavelength. |
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Instrumentation Stability Top
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System Stability, 4 Weeks, 7500 Spectra |
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50/50 Toluene / Acetonitrile Solution and a Diamond Reference Standard |
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Peaks Fit to a Gaussian / Lorentzian Combination |
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System Stability, 4 Weeks, 7500 Spectra |
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Histogram of Fitted Gaussian / Lorentzian Mean Toluene : 1003.445 +/- 0.011 |
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Instrument Calibration Top
| PI-200 Neon Calibration Lamp with Andor CCD Camera |
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| Spectrum of a Neon Calibration Lamp taken with the PI-200 Raman analyzer and the Andor CCD camera. We use this spectrum to calibrate the pixels of the CCD Camera in wavelength (nm). |
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| PI-200: Toluene Acetonitrile Calibration |
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| Spectrum of Toluene Acetonitrile taken with the PI-200 Raman analyzer and the Andor CCD camera. We use this spectrum to calibrate the pixels of the CCD Camera in wavelength (nm). |
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| Intensity Calibration with Broadband Source |
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| Spectrum of a Broadband Source. We use this spectrum to calibrate the intensity of the CCD Camera in the Raman Instrument. |
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