Monochromator technology

In an analyzer based on scanning monochromator technology, one should be aware of a number of critical design issues ... 

Fluorescence spectra were measured at wavelength scanning of tunable dye-laser. In spite of the monochromic excitation the fluorescence spectmm has quite complex composition. Such variety of wavelengths allows to optimize fluorescence excitation and registration for any technological conditions. 

One of the most obvious markets for thin-film vapor-deposited organic materials is in flat panel displays [123], a market currently dominated by LCDs. Over the last two decades, a great improvement in the lifetime and efficiency of OLEDs have been achieved. OLED displays can already be found in simple applications such as automobile stereos, mobile phones, and digital cameras. However, to exploit the advantages of the technology fully, it is necessary to pattern the OLEDs to form monochrome, or more preferentially, full-color displays. This section will consider the difficulties involved in addressing such displays (either passively or actively) and the variety of patterning methods that can be used to produce full-color displays. 

Near-infrared Spectroscopy for Process Analytical Technology 119 5.3.2 The scanning grating monochromator and polychromator diode-array... 

Previous NAA raid petrographic studies showed the Iron I Philistine pottery to be locally made in Philistia (3,5, 6). Moreover, several of the wares indicated specified technological aspects of clay selection and treatment this was especially shown by Killebrew in her petrographic and stylistic study of Monochrome pottery from Ekron (3, 7). Thus, the Philistine pottery represents, at least in the early stages, pottery made in Philistia by potters with some Aegean technological skills. 

In this section the mainstream NIRS technologies in current widespread practical use for PAC applications will be examined. These are scanning grating monochromators, grating polychromator PDA spectrometer, AOTF analysers and FTNIR analysers. 

What follows is a detailed discussion of the principles of operation and practical limitations of analysers based on scanning monochromators. Included in this discussion will also be the background information on NIR source and detector technologies, which are in fact common to all of the NIR spectroscopic technologies listed above. 

Fig. 6. Solid-state technology a monochrome chip b mono-chip for color imaging c set-up for 3-CCD color imaging...

The number of devices required to multiplex a monochromic television display of moderate resolution is enormous, about 100,000, and color schemes triple this number (see, e.g., Uchida etal., 1982,1983). To succeed, therefore, a specific technology must demonstrate not only that individual elements meet the (very modest) electrical requirements but also that active matrices, with gate counts comparable to the largest intergrated circuits produced, can be fabricated with acceptable yields. 

Raman scattering was first observed in 1928 and was used to investigate the vibrational states of many molecules in the 1930s. Initially, spectroscopic methods based on the phenomenon were used in research on the structure of relatively simple molecules. Over the past 20 years, however, the development of laser sources and new generations of monochromators and detectors has made possible the application of Raman spectroscopy to the solution of many problems of technological interest. 

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