Thermal measuring and testing – Transformation point determination – By change in optical property
Patent
1989-12-21
1992-02-18
Cuchlinski, Jr., William A.
Thermal measuring and testing
Transformation point determination
By change in optical property
374 20, 374 27, G01N 2504, G01N 2512
Patent
active
050888331
ABSTRACT:
Apparatus for monitoring the cloud point of a liquid, or the temperature at which any light scattering phase occurs therein, comprising a light-proof and light-absorbing chamber, and a liquid sample-receiving receptacle within the chamber having a bottom formed by a non-light-scattering surface; this surface being in thermal contact with a heating or cooling device, such as a thermoelectric cooler, and with a temperature measurement device. The chamber can be opened to allow access to the receptacle so that sample liquid can be placed therein. A light beam source is located to direct a beam of light onto the surface at an incident angle so that light from the beam is reflected or absorbed by the surface. A light detector including a lens and an array of detection cells is arranged so as to detect scattered light which is produced when solid material forms in the liquid as it is cooled or disappears on heating. The melting point of a solid, or the boiling point of a liquid, can be detected, in additoin to cloud points.
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Ker Victoria S.
Tsang Charles Y.
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Nova Husky Research Corporation
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