Fiber optic spectrometers

An industrial microscope with a long-working distance 20 X objective is used for the collection of the chromatic interference patterns. They are produced by the recombination of the light beams reflected at both the glass/chromium layer and lubricant/steel ball interfaces. The contact is illuminated through the objective using an episcopic microscope illuminator with a fiber optic light source. The secondary beam splitter inserted between the microscope illuminator and an eyepiece tube enables the simultaneous use of a color video camera and a fiber optic spectrometer. 

Figure 1. Schematic (a) of the overall fiber optic spectrometer and (b) magnified view of the optical coupler. (Reproduced from ref. 5. Copyright 1986 American Chemical Society.)...

The fiber-optic spectrometer used for this work is shown in Figure 2. The illumination block consists of a 5-watt quartz-halogen lamp whose output is chopped at 30 Hz and imaged onto the excitation optical fiber. The UV wavelengths are removed from the excitation light with a long-wavelength pass... 

Figure 1. Multi-wavelength transmission (right) and reflection (left) measurements of colloidal systems using miniaturized fiber optics spectrometers.

For the optical characterization, the samples were cut directly from the extruded material. Absorption spectra were recorded on a Perkin-Elmer Lambda 9 spectrophotometer and on an Ocean Optics fiber optic spectrometer. The reflectance spectra were recorded using the fiber optics spectrometer with a reflectance probe. 

PIM-l thin films exhibit excellent optical sensing properties by changing their color on adsorbing organic vapor, even at very low concentration (Figure 10.12). Although the performance of a fiber-optic spectrometer is better than this, for PIM-l the hindrance effect due to humidity is less due to the hydrophobicity. The microporous nature, as well as the behavior towards solvent, is the key to fabricate sensor-based devices with PIMs. ... 

Fiber optic spectrometers with reflectance probes build an additional degree of flexibility into reflectance spectroelectrochemical measurements. Fiber optic reflectance probes are typically made of multiple fiber optics which direct the light from the source to the sample surrounding one or more fiber optics which collect the reflected light and direct it to the detector. These fibers are usually combined within a single cable which is bifurcated... 

Figure 14.11 Fiber optic spectroelectrochemical arrangement for electronic spectroscopy. A conventional electrochemical ceU is combined with a fiber optic spectrometer in which the optical fiber is directed in front of the working electrode at the bottom of the cell.

Figure 13-24 shows a photograph of a miniature fiber-optic spectrometer using a linear CCD array. The optical diagram is similar to that shown in Figure 13-14, except that fiber optics are used to transport the radiation to and from the sample cell. In the version shown, the spectrometer is external to the computer. The output of the array connects to an analog-to-digital converter board in the computer. In other models, the spectrometer contains the converter and interfaces to the computer via a USB port. Such spectrometers are available from about 1800 to about 5000. 

FIGURE 13-24 A multichannel miniature fiber-optic spectrometer. A fiber-optic cable transports the light beam from the cell holder on the left to the spectrograph detector on the right. In some models, the spectrograph and detector are mounted on a circuit board inserted into the computer. (Courtesy of Ocean Optics, Inc.. Dunedin. FL.)... 

LabX P.O. Box 216 478 Bay Street Midland, ON, Canada L4R 1K9 ToUFree 888-781-0328 TEL 705-528-6888 FAX 705-528-0270 Email help labx.com Fiber-optic spectrometers Up to 2200 nm... 

Zeiss Optronics, GmbH Carl Zeiss Str. 22 73447 Oberkochen Germany TEL (-F49) 73 64 20 01 Fax (-F49) 73 64 20 45 88 Email zeo zeiss.de URL www.zeiss-optronik.de DA, fiber-optic spectrometers 195-2150 nm... 

Klinkhammer, G.P. (1994). Fiber optic spectrometers for in-situ measurements in the oceans The ZAPS probe. Mar. Chem., 47,13-20. 

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