Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Patent
1998-10-09
2000-12-19
Williams, Hezron
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
356349, 250432R, G01N 2900, G01N 2101, G01B 902
Patent
active
061614262
ABSTRACT:
A photoacoustic flow measuring cell (1a, 1b) for measuring oil residues in water including a photoacoustic sensor principle based on converting optical energy into acoustic energy by absorption of light on oil molecules in water. A measuring cell (1a, 1b) having contamination-free infeed optics (9, 10, 11, 21) is produced by providing a free fall stage (3) for a contactless feed (12) of light into an analyte (4). A sound detector (16) is an externally mounted piezoelectric transducer (16) or an optical interferometer (23) which measures vibrations of a liquid surface (6) without contacting the same. The photoacoustic free fall measuring cell (1a, 1b) provides a high level of detection, well into the ppm concentration range, low susceptibility to faults and is suitable, in particular, for use in high pressure separating tanks (28) for conveyance of crude oil.
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P. Hodgson et al.; "Application of Pulsed Laser Photoacoustic Sensors in Monitoring Oil Contamination in Water"; Sensors and Actuators B29 (1995); pp. 339-344.
H.A. MacKenzie et al.; "A Laser Photoacoustic Sensor for Analyte Detection in Aqueous Systems"; Sensors and Actuators B, 11, pp. 213-220 (1993) (Discussed in Specification).
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Detection of photoacoustic waves in liquids by fibre optic interferometry by D.P. Hand, et al, published in Optics Communications, pp. 1-6.
Byatt John Anthony
Kleiner Thomas
Matter Daniel
Spanner Gunter
ABB Research Ltd.
Politzer Jay L.
Williams Hezron
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