Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-01-28
1999-10-05
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250221, H01J 516
Patent
active
059628472
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for sensing radiation from a radiation source on a traveling strip-like sample reflected from or transmitted through the sample.
With certain kinds of products, it seems sensible or even necessary, to perform quality controls during the production, for example with regard to the material composition of the product. Such controls are often performed by means of the interaction of radiation, for example infra red radiation, with the samples to be tested. Thereby the sample is exposed to the radiation and the radiation, transmitted through the sample or reflected from the surface of the sample, is guided to a unit of analysis. Thereby it is desired that, the measures for the quality control are integrated into the production process in such a way that this process is disturbed as little as possible.
2. Description of the Prior Art
In the case of traveling strip-like products, as for example paper and textile webs, it is known to admit a radiation to the traveling product at a certain position of the path of the product and to capture a largest possible fracture of the reflected or transmitted radiation with radiation absorption devices, which in a fixed position. To make sure that as little as possible of this radiation is lost, it is favorable to guide these radiation absorption devices as close to the sample to be tested as possible. If the radiation absorption devices are mounted onto the traveling sample directly, it leads to the disadvantage of an effect of the friction, which may impair the product.
SUMMARY OF THE INVENTION
It is the task of the present invention to provide a device of the above mentioned kind which guarantees a high effect of the radiation to be analyzed and which avoids a mechanical damage of the sample to be tested.
With a device of the above mentioned kind this task is solved by a rotary cylindrical roller, whose periphery contacts the strip-like sample with power conformity and which has at least one radiation transparent sensing point at the periphery and a central radiation-transparent decoupling point at one end, and by means positioned inside the roller for the transmission of the radiation from the sensing point(s) to the decoupling point.
Such a roller can be put into the path of the production of a traveling strip-like sample without disturbing the production process. When the strip-like sample is guided via the roller, the radiation absorption devices, sensing the radiation to be analyzed, contact the surface of the sample. That way the entire radiation, deriving from the part covered by the sensing point of the surface of the sample, is captured by the sensing points.
In the running operation of the production the speed of the surface of the roller corresponds to the speed of the traveling sample, so that there is no sliding friction between the two surfaces. If the radiation is sent to the side of the strip-like sample, which is opposite of the periphery of the roller, then the radiation transmitted by the sample is analyzed.
The device according to the invention can also be embodied in such a way that positioned at the other end of the roller it provides a central radiation-transparent coupling point, deriving directly from the radiation source, and that is has means for the transmission of the radiation which is directed in via the coupling point, to each sensing point.
Hereby the radiation, deriving from the radiation source is sent to the surface of the sample to be analyzed via the inside of the roller and the light reflected therefrom is guided back out of the roller to the analysis.
The device according to the invention can also be embodied in such a way that at least two of the sensing points on the roller have different angles of the periphery with regard to the cylinder system of coordinates.
That way it is guaranteed, that if the roller turns one single time, several consecutive points, positioned in the direction of the movement of the sample, of the surface of the samp
REFERENCES:
patent: 4972074 (1990-11-01), Wright
Dederichs Heinz-Wilhelm
Hamedat-Schumacher Ursula
Ischdonat Thomas
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