Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1974-04-29
1977-07-26
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
G01N 2146
Patent
active
040379671
ABSTRACT:
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.
REFERENCES:
patent: 2474044 (1949-06-01), Forrest
patent: 2972926 (1961-02-01), Goldberg et al.
Reissland Martin-Ulrich
Schweizer Walter
Clark Conrad
Corbin John K.
Munz Otto John
VDO Adolf Schindling AG
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