Monitoring of fluid contamination level wherein the light energy is focused on the fluid passage means
Patent 5438420 Issued on August 1, 1995. Estimated Expiration Date: 
August 9, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 9, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3141094 3740155 3784307 3794428 Apparatus for counting particle contamination in a liquid Instrument for measuring concentration of substance in suspension Comparative colorimeter Particle size measuring instrument with direct scattered light detection Particle measuring fluid cell having non-corrodible shims Light scattering method and apparatus for detecting particles in liquid sample InventorsAssigneeApplicationNo. 103352 filed on 08/09/1993US Classes:356/440, With significant sample holder or supply356/442With light detectorExaminersPrimary: Rosenberger, Richard A.Assistant: Kim, Robert H. Attorney, Agent or FirmForeign Patent References
International ClassG01N 021/00AbstractApparatus for monitoring fluid contaminant level that includes a light source positioned on one side of a fluid sample path for directing light energy into fluid flowing in the sample path, a photosensor positioned on the same side of the sample path, and a reflector positioned on an opposing side of the sample path for receiving light from the source transmitted through the sample fluid and reflecting such light back through the fluid to the photosensor. The photosensor provides an electrical signal as a function of intensity of light incident thereon from the light source after having twice passed through the fluid, and the concentration or level of contaminants in the fluid is indicated as a function of such electrical signal. Thus, the concentration of contaminants that extinguish light energy transmitted through the fluid is indicated as an inverse function of light intensity at the photosensor, and may be compared to a preset target threshold level for indicating an undesirably high contamination level.Other References
| |
