Method and device for automatic spectrometric analysis of a liquid, particularly of milk
First Claim
1. Method of spectrometric analysis of a liquid, by measurement of the absorption in various frequency bands of an infrared radiation, characterized in that the following operations are carried out in succession:
- a small volume of the liquid to be analyzed is accurately dispensed and is deposited on the planar upper surface of a small plaque (7) of a material which is transparent to the radiation employed.this volume of liquid is spread on the small plaque over a well-defined surface area with the aid of a rotary device,the liquid spot thus produced is dried, until a dry spot is obtained,the small plaque (7) carrying its dry spot is subjected to spectrometic analysis in the absence of the solvent of the liquid, andthe upper surface of the small plaque is cleaned by wiping and polishing before the next measurement.
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Accused Products
Abstract
A method and device for automatic spectrometric analysis of a liquid, particularly of milk, is provided. A plate with an aperture is inserted into a cell containing the liquid. The plate is then withdrawn from the cell, leaving the aperture filled with a defined volume of the liquid. A jet of air is used to deposit the volume of liquid onto a plaque. The plaque is then moved into vertical alignment with the spreading device. The spreading device includes a bent wire rotatable by, for example, a motor for spreading the liquid into a circular spot. Preferably, the spot is dried while it is being spread. The plaque is then moved adjacent to a spectrometric analysis device for, for example, passing infrared radiation through the sample and to a detector, preferably configured to detect several wavelengths. The plaque carrying the sample is then moved to a cleaning station where it is cleaned by wiping the spot, preferably with a tape of filter paper wetted with detergent or solvent.
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Citations
20 Claims
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1. Method of spectrometric analysis of a liquid, by measurement of the absorption in various frequency bands of an infrared radiation, characterized in that the following operations are carried out in succession:
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a small volume of the liquid to be analyzed is accurately dispensed and is deposited on the planar upper surface of a small plaque (7) of a material which is transparent to the radiation employed. this volume of liquid is spread on the small plaque over a well-defined surface area with the aid of a rotary device, the liquid spot thus produced is dried, until a dry spot is obtained, the small plaque (7) carrying its dry spot is subjected to spectrometic analysis in the absence of the solvent of the liquid, and the upper surface of the small plaque is cleaned by wiping and polishing before the next measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 13)
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10. A device for spectrometric analysis of a liquid comprising:
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first means for dispensing of a precise volume of liquid and depositing said volume liquid on a small plaque (7), second means for spreading of this volume over a determined surface area to allow said liquid to dry into a spot, third means for spectrometric analysis of the small plaque (7) carrying its dry spot, and a device for wiping with the aid of a filter-paper tape (48) with suitable detergents and solvents, a device for producing movement (8, 9,
10), ensuring the movement of a small support-plaque (5) carrying at least one small plaque (7) to cause it to occupy the various stations in succession. - View Dependent Claims (11, 12, 14, 15, 16, 17, 18, 19, 20)
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Specification