Two-beam colorimeter

Details Two-beam colorimeter Two-beam colorimeter

G - Physics

01

J

73/56, 73/57

G01J 3/46 (2006.01) G01N 21/25 (2006.01)

Patent

CA 1061593

ABSTRACT Two-beam colorimeters, used for the colorimetric determination of a liquid component, have the disadvantages that the reference filter which is used is not, by itself, adequate to produce precise colorimetric measurement. In addition, when the colorimeter is in continuous operation, the intensity of the light source diminishes. This invention overcomes these difficulties through the use of a movable adjusting filter, and through the use of a resistor connected in series with the light source. The invention provides a two-beam colorimeter comprising an incandescent lamp, a resistor connected electrically in series with the incandescent lamp, a condenser, an interfer- ence filter, and a two-hole diaphragm disposed sequentially along a path of light transmission from the lamp. The diaphragm develops a comparison light beam and a measuring light beam. A reference filter is disposed in the path of the comparison light beam, and an adjusting filter is movable into and out of the path of the measuring light beam.

251181

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