초록 ▼

An apparatus for continuously measuring the density of a liquid within prespecified limits, utilizing the law of refraction, particularly an apparatus for measuring the acid density of a motor vehicle storage battery for the purpose of determining its state of charge. The apparatus has an optical sy

An apparatus for continuously measuring the density of a liquid within prespecified limits, utilizing the law of refraction, particularly an apparatus for measuring the acid density of a motor vehicle storage battery for the purpose of determining its state of charge. The apparatus has an optical system with a photosensitive element and a light transmissive body with a measuring surface which is in contact with the liquid, and with a light source which illuminates the measuring surface. The light source has an illuminated surface with a non-directional transmission. The illuminated surface facing the measuring surface is spaced therefrom. The illuminating surface together with said measuring surface define an open container filled with the said liquid. A frosted glass disc illuminated by a lamp forms the illuminated surface. The optical system contains a convergent lens whose main plane, together with the measuring surface encloses a precisely defined acute angle.

대표청구항 ▼

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, comprisi

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, and E. 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.