ApplicationNo. 454270 filed on 12/21/1989
US Classes:374/17, By change in optical property (e.g., transmission)374/20, Controlling heating or cooling374/27Between gaseous and liquid states
ExaminersPrimary: Cuchlinski, William A. Jr.
Assistant: Gutierrez, Diego
Attorney, Agent or Firm
Foreign Patent References
International ClassesG01N 025/04
Foreign Application Priority Data1988-02-10 CA
AbstractApparatus 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.
Field of SearchBy change in optical property (e.g., transmission)
By reflection (e.g., polished surface)
Sensed by instrument (e.g., photocell)
Controlling heating or cooling
TRANSFORMATION POINT DETERMINATION (E.G., DEW POINT, BOILING POINT)
Between gaseous and liquid states
Moisture or humidity (e.g., rain)