Fibres infrared

Telephone cable Pneumatic Optical fibre Optical - infrared Radio... 

Changes of fibre optical properties and thus changes of the analyte can be detected in the ultraviolet (UV), visible (VIS), near infrared (NIR) and middle/far infrared (IR) regions. There are only a few materials sufficiently transparent in the UV region, and among them, the pure silica is uniquely suitable for fibre drawing. From Figure 5 it can be seen that the UV... 

Shalem S., German A., Barkay N., Moser F., Katzir A., Mechanical and optical properties of silver-halide infrared transmitting fibres, Fiber and integrated optics 1997 16 27-54. 

Stewart G., Jin W., Culshaw B., Prospects for fibre-optic evanescent-field gas sensors using absorption in near-infrared, Sensors and Actuators B 1997 38-39 42-47. 

Walsh J.E., MacCraith B.D., Meany M., Vos J.G., Regan F., Lancia A., Artjushenko S., Sensing of chlorinated hydrocarbons and pesticides in water using polymer coated mid-infrared optical fibres, Analyst, 1996 121 789-792. 

Scorsone E., Christie S., Persaud K.C., Simon P., Kvasnik F., Fibre-optic evanescent sensing of gaseous ammonia with two forms of a new near-infrared dye in comparison to phenol red, Sensor. Actual. B-Chem. 2003 90 37-45. 

Stueflotten S., Christensen T., Iversen S., Hellvik J. O., Almas K., Wien T., An infrared fibre optic gas detection system, Proc. Ofs-94 int conf, 1986, p. 87. 

The general stability of the polycyclic vat dyes permits many of them to be used as pigments [27]. Several types of polycyclic vat colorants provide structures suitable for use on cellulosic fibres for infrared camouflage [28]. 

Banks etal. (1995) reacted TMP fibres with glycidyl methacrylate (GMA) (Figure 6.4b), maleic anhydride or succinic anhydride and hot-pressed the modified fibres with methyl methacrylate in the presence of BPO. Infrared evidence was presented indicating that copolymerization had occurred between the bonded GMA and methyl methacrylate. However, in a later study, Qetin and Hill (1999) could find no evidence to suggest that a chemical bond had formed between the GMA and wood. 

M. Blanco, J. Coello, H. Iturriaga, S. Maspoch, C. Pezuela and E. Russo, Control analysis of a pharmaceutical preparation by near-infrared reflectance spectroscopy a comparative study of a spinning module and fibre optic probe, Anal. Chim. Acta, 298, 183-191 (1994). 

Reeves, J.B. Ill and McCarty, G.W. (2001) Quantitative analysis of agricultural soils using near infrared reflectance spectroscopy and a fibre-optic probe. Journal of Near Infrared Spectroscopy 9, 25-34. 

Reeves, J.B. Ill and Van Kessel, J.S. (2000) Determination of ammonium-N, moisture, total C and total N in dairy manures using a near infrared fibre-optic spectrometer. Journal of Near Infrared Spectroscopy 8, 151-160. 

Extensive use has been made of NIRA in agriculture where it has been used to determine the protein, fibre, water and triglyceride contents of feedstuffs and the quality of crops. By training the computer to recognise the near-infrared (NIR) spectra of the major components making up a crop, the individual components can be monitored in the crop itself. The components that can be measured by NIRA often cannot be measured by the usual spectroscopic methods. The fundamental work done in the quality control of agricultural products can be readily extended to the quality control of pharmaceutical formulations. 

The elucidation of the crystal structures of polymers from their x-ray diffraction patterns is frequently a difficult and laborious task. The work usually proceeds by trial and error methods in which calculated intensities for likely structures are compared with the observed intensities of diffraction spots. Furthermore, x-ray fibre photographs often contain relatively few reflections and it is always possible that more than one structure may give a reasonable fit with the observed intensity data. Additional information which can be obtained from infrared spectra can often provide considerable help with both these difficulties and in particular many trial structures can be eliminated without recourse to time-consuming calculations of x-ray intensities. 

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