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Apparatus for measuring the density of a liquid, utilizing the law of refraction

  • US 4,037,967 A
  • Filed: 04/29/1974
  • Issued: 07/26/1977
  • Est. Priority Date: 05/14/1973
  • Status: Expired due to Term
First Claim
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1. Apparatus for continuously measuring the density of a liquid within predetermined limits by use of the law of refraction, said apparatus being particularly useful for measuring the density of the electrolytic acid in a motor vehicle storage battery in order to determine its state of charge, comprising:

  • A. a light-transmissive body having a measuring surface thereon,B. a plate of frosted light-transmissive material comprising at least one frosted surface and at least one edge, the frosted surface being mounted in a position facing the measuring surface and spaced therefrom,C. a lamp for directing light into the edge of said plate to cause the frosted surface to function as an illuminating surface of a light source with non-directional light transmissive characteristics,D. the illuminating surface and the measuring surface defining walls of an open chamber which is filled with the liquid, andE. a photosensitive element placed to receive light deflected by the measuring surface,F. said measuring surface being enclosed by an opaque layer, and the light-transmissive body being arranged relative to the direction of rays emanating from said light source, so that only the light rays refracted in the area of the end of the opaque layer into the light-transmissive body strike the photosensitive element.

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