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26 November 1983 An Industrial Application Of An Infrared Tunable Diode Laser For The Continuous And Automatic Analysis Of A Process Stream
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Abstract
An application of an infrared tunable diode laser for the continuous and automatic analysis of a process stream is described. In a commercially operating continuous compounding process for the manufacture of room temperature vulcanized (RTV) silicone products, the content of crosslinker, methyltriacetoxysilane (MTAS), is measured by means of the infrared absorption of this carbonyl group. This monitoring and subsequent process control plays a crucial role in manufacturing RTVs with the desired physical properties. The high intensity, narrow line width of the laser overcomes two obstacles which preclude the use of more conventional, commercially available process control instruments; in par-ticular, 1) relatively long optical path lengths are used allowing for timely and representative sampling and 2) an off-center absorption frequency is used to discriminate against non-MTAS carbonyl groups.
© (1983) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A N Schweid and B B Hardman "An Industrial Application Of An Infrared Tunable Diode Laser For The Continuous And Automatic Analysis Of A Process Stream", Proc. SPIE 0438, Tunable Diode Laser Development and Spectroscopy Applications, (26 November 1983); https://doi.org/10.1117/12.937429
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