Measuring apparatus
First Claim
1. A measuring apparatus adapted to receive a test piece, to which a specimen is applied, that measures a concentration of the specimen on the basis of a change of color of a test material which is housed in said test piece and which reacts with said specimen, comprising:
- irradiation means for irradiating said test material with light;
loading detection means for detecting whether the test piece is inserted into a main body of the apparatus;
time measurement means for measuring a predetermined time period in which the reaction of said test material with the specimen is substantially completed, after the insertion of said test piece is detected by means of said loading detecting means;
detection means for detecting an intensity of the light reflected from said test material and outputting a corresponding analog signal;
digital conversion means for sampling said analog signal a plurality of times before and after the predetermined time period has elapsed and converting each sample into a digital signal; and
computation means for computing an average value of said digital signals sampled by said digital conversion means and determining the constituent concentration of said specimen by referring to a stored conversion table on the basis of said average value.
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Accused Products
Abstract
The present invention is an apparatus for measuring the constituent concentration of a specimen on the basis of the color change in a test material housed in a test piece, which has reacted because of the specimen. The apparatus irradiates the test material which is a test piece loaded in the apparatus'"'"'s main body and detects the intensity of the light reflected by the test material. A detection signal detected in the above way is sampled in a time period before and after the measurement timing at which the test material changes in color because of the specimen. An average value of the sampled detection signals is determined. The constituent concentration of the specimen is computed by referring to a stored conversion table on the basis of the average value determined in the above way.
42 Citations
14 Claims
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1. A measuring apparatus adapted to receive a test piece, to which a specimen is applied, that measures a concentration of the specimen on the basis of a change of color of a test material which is housed in said test piece and which reacts with said specimen, comprising:
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irradiation means for irradiating said test material with light; loading detection means for detecting whether the test piece is inserted into a main body of the apparatus; time measurement means for measuring a predetermined time period in which the reaction of said test material with the specimen is substantially completed, after the insertion of said test piece is detected by means of said loading detecting means; detection means for detecting an intensity of the light reflected from said test material and outputting a corresponding analog signal; digital conversion means for sampling said analog signal a plurality of times before and after the predetermined time period has elapsed and converting each sample into a digital signal; and computation means for computing an average value of said digital signals sampled by said digital conversion means and determining the constituent concentration of said specimen by referring to a stored conversion table on the basis of said average value. - View Dependent Claims (2, 3, 4, 5, 6, 11)
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7. A measuring apparatus adapted to receive a test piece, to which a specimen is applied, that measures a concentration of the specimen on the basis of a change of color of a test material which is housed in said test piece and which reacts with said specimen, comprising:
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loading detection means for detecting whether the test piece is inserted into a main body of said apparatus; time measurement means for measuring a predetermined time period in which the reaction of said test material with the specimen is substantially completed, after the insertion of said test piece is detected by means of said loading detection means; irradiation means for irradiating said test material with light before and after the predetermined time period has elapsed; detection means for detecting an intensity of light reflected from said test material irradiated by said irradiation means and outputting a corresponding analog signal; digital conversion means for sampling said analog signal a plurality of times before and after said predetermined time period has elapsed and converting each sample into a digital signal; computation means for computing an average measurement value by computing the average value of said digital signals sampled by said digital conversion means; and arithmetic operation means for determining the constituent concentration of said specimen by referring to a stored conversion table on the basis of said average measurement value. - View Dependent Claims (8, 9, 10, 12, 13, 14)
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Specification