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Contamination Detector and Controller

IP.com Disclosure Number: IPCOM000060814D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Dawson, KA: AUTHOR [+3]

Abstract

A technique for determining the amount of contamination in a process solution is accomplished by scanning samples with different levels of solute in solution using ultraviolet spectroscopy. After a series of samples are run on a particular contaminate, the scans are overlaid and the overlays are inspected to determine if a wavelength band shows separation by the amount of contamination in the sample. If so, a narrow band optical filter is specified out covering the area displaying the separation to allow the detection of the level of contamination in solution. Several different solvents may be characterized and the corresponding narrow band optical filters specified. A pulsed xenon light source and detector will display a number representative of the amount of light received at the detector.

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Contamination Detector and Controller

A technique for determining the amount of contamination in a process solution is accomplished by scanning samples with different levels of solute in solution using ultraviolet spectroscopy. After a series of samples are run on a particular contaminate, the scans are overlaid and the overlays are inspected to determine if a wavelength band shows separation by the amount of contamination in the sample. If so, a narrow band optical filter is specified out covering the area displaying the separation to allow the detection of the level of contamination in solution. Several different solvents may be characterized and the corresponding narrow band optical filters specified. A pulsed xenon light source and detector will display a number representative of the amount of light received at the detector. Clean solvent results in the maximum amount of light being received. The last step in the technique is to normalize these signals with neutral density filters. Clean solvent should be approximately 100 and contaminated solvent less; the more contaminated the solution, the smaller the signal. As seen in the drawing, the process works when a pulsed light source 1 emits a light which passes through a narrow band optical filter 2 and neutral density filter 3 into a sample cell 4. The pulsed light source 1 uses a xenon bulb which is rich in UV. This UV signal is transmitted through a fused quartz cell which contains the process sample 4. Note...