Optical measuring device for test strips
First Claim
1. An optical measuring device for detecting the coloring of test fields of a test strip to be wetted with a liquid for detecting substances in said liquid, whereupon the reflectivity of the test fields changes depending on the concentrations of the substances to be detected, comprising:
- a measuring plane upon which said test strip is to be placed;
an illumination device for illuminating the measuring plane and the test strip;
a planar image sensor;
an optical system for providing an image of the test strip onto said planar image sensor;
an electronic evaluation unit for evaluating at least one signal generated by said planar image sensor, wherein said illumination device comprises at least two light sources of different colors to alternatively illuminate said test strip in said different colors such that said electronic evaluation unit detects the coloring of said test fields under different color illuminations; and
an adjustable reference surface that is movable between a first position in which it takes on the position of a test strip during measurement and a second position in which it cannot be imaged by said optical system onto said image sensor.
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Accused Products
Abstract
An optical measuring device (10) for detecting the coloring of test fields of a test strip (12), which is to be wetted with a liquid for detecting substances in said liquid, whereupon the reflectivity of the test fields changes depending on the concentrations of the substances to be detected, comprising: a measuring plane (14) wherein said test strip (12) is to be placed; an illumination device (16) for illuminating the measuring plane (14); a planar image sensor (36); an optical system for imaging said measuring plane (14) onto the image sensor (36); and an electronic evaluation unit (52) for evaluation of the signals detected by said image sensor (36), said illumination device (16) comprises light sources (18, 20, 22) or other means of different colors which serve to alternatively illuminate said measuring plane (14) in different colors, wherein said electronic evaluation unit (52) detects the coloring of the test fields from the images obtained under different color illuminations.
17 Citations
20 Claims
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1. An optical measuring device for detecting the coloring of test fields of a test strip to be wetted with a liquid for detecting substances in said liquid, whereupon the reflectivity of the test fields changes depending on the concentrations of the substances to be detected, comprising:
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a measuring plane upon which said test strip is to be placed; an illumination device for illuminating the measuring plane and the test strip; a planar image sensor; an optical system for providing an image of the test strip onto said planar image sensor; an electronic evaluation unit for evaluating at least one signal generated by said planar image sensor, wherein said illumination device comprises at least two light sources of different colors to alternatively illuminate said test strip in said different colors such that said electronic evaluation unit detects the coloring of said test fields under different color illuminations; and an adjustable reference surface that is movable between a first position in which it takes on the position of a test strip during measurement and a second position in which it cannot be imaged by said optical system onto said image sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification