Method and device for checking the liquid take up of a test layer of an analysis element
First Claim
1. A method for checking the taking up of a liquid by an absorbent test layer of an analysis element, which absorbent test layer is in contact with a segment of optically transparent foil, the method comprising the steps of:
- taking up liquid by absorption in the test layer, illuminating the test layer with primary light, and detecting secondary light emerging from the circumferential surface of the foil segment of the analysis element for generating a light signal which is characteristic of the liquid take up by absorption in the test layer.
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Abstract
Method and device for checking the liquid take up of a test layer of an analysis element. The test layer is absorbent and takes up a liquid when an analysis is carried out. The test layer is illuminated with primary light to generate a light signal characteristic of the liquid take up. Secondary light emerging here from the analysis element is detected. The test layer is in contact with an optically transparent foil segment. Reliably checking liquid take up is achieved by detecting secondary light emerging from the circumferential surface of the foil.
39 Citations
32 Claims
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1. A method for checking the taking up of a liquid by an absorbent test layer of an analysis element, which absorbent test layer is in contact with a segment of optically transparent foil, the method comprising the steps of:
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taking up liquid by absorption in the test layer, illuminating the test layer with primary light, and detecting secondary light emerging from the circumferential surface of the foil segment of the analysis element for generating a light signal which is characteristic of the liquid take up by absorption in the test layer. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14, 31)
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7. An analytical system comprising
at least one analysis element having an absorbent test layer in surface contact with an optically transparent foil segment having a circumferential surface, an evaluation instrument with a light source directed onto the test layer, by which the test layer located in a measuring position in the evaluation instrument is illuminated with primary light, the evaluation instrument further including evaluation electronics adapted for generating information about the take up of liquid by the absorbent test layer on the basis of a change of the light signal during take up of the liquid, and a light receiver adapted and arranged for detecting secondary light emerging from the analysis element and to generate a light signal and is further adapted and arranged such that the light receiver and the circumferential surface are juxtaposed and the light receiver detects secondary light emerging from the circumferential surface of the foil segment.
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15. A method for analyzing a sample liquid, the method comprising the steps of:
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providing an analysis element having at least one test layer of absorbent material, which test layer is fixed to the analysis element and is in contact with a segment of an optically transparent foil, contacting the analysis element with the sample liquid, absorbing a quantity of the sample liquid into the test layer, said quantity corresponding to the absorbency of the test layer, and checking the taking up of the sample by the absorbent test layer, said checking step comprising a) illuminating the test layer with primary light, b) detecting secondary light emerging from the circumferential surface of the foil segment thereby generating a transversal signal and c) generating a signal characteristic of the liquid take up from the transversal signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. An analytical system comprising
an analysis element having at least one test layer of absorbent material, which test layer is fixed to the analysis element and is in contact with a segment of an optically transparent foil, and an evaluation instrument formed to check the taking up of the sample by the absorbent test layer, the evaluation instrument including evaluation electronics comprising a) means for illuminating the test layer with primary light, b) means for detecting secondary light emerging from the circumferential surface of the foil segment thereby generating a transversal signal and c) means for generating a signal characteristic of the liquid take up from the transversal signal.
Specification