Method and apparatus for monitoring and ensuring product quality
First Claim
1. A method of monitoring the product quality of a continuously produced product and comprising the steps ofgenerating a continuous test signal which is representative of a quality parameter of the product,digitizing the test signal,determining a frequency distribution from the digitized test signal, which indicates how often a specific value of the test signal occurs, andintegrating the frequency distribution in segments of the frequency distribution to derive a statistically relevant feature which describes the product quality.
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Abstract
In a quality monitoring method it is proposed that in continuous operation a test signal be generated, digitized, logarithmized, followed by the calculation of a frequency distribution of the test signal amplitude. The frequency distribution can then be integrated in individual areas, the result for each area forming a feature of the test signal. The features of a test signal are combined into vectors, which can be used for a better evaluation of the quality of the production plant.
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Citations
21 Claims
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1. A method of monitoring the product quality of a continuously produced product and comprising the steps of
generating a continuous test signal which is representative of a quality parameter of the product, digitizing the test signal, determining a frequency distribution from the digitized test signal, which indicates how often a specific value of the test signal occurs, and integrating the frequency distribution in segments of the frequency distribution to derive a statistically relevant feature which describes the product quality.
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10. An apparatus for monitoring the product quality of a continuously produced product and comprising
a test unit for generating a continuous test signal which is representative of a quality parameter of the product, a signal processor for digitizing the test signal, determining a frequency distribution from the digitized test signal which indicates how often a specific value of the test signal occurs, and integrating the frequency distribution in segments of the frequency distribution to derive a statistically relevant feature which describes the product quality.
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13. A method of monitoring the product quality of a continuously produced product and comprising the steps of
generating a continuous test signal which is representative of a quality parameter of the product, digitizing the test signal, determining a frequency distribution from the digitized test signal, which indicates how often a specific value of the test signal occurs, integrating the frequency distribution to derive a statistically relevant feature which describes the product quality, and comparing the derived statistically relevant feature with an ideal value thereof.
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15. A method of monitoring the product quality of a continuously produced product and comprising the steps of
generating a continuous test signal which is representative of a quality parameter of the product, digitizing the test signal, determining a frequency distribution from the digitized test signal, which indicates how often a specific value of the test signal occurs, integrating the frequency distribution to derive a statistically relevant feature which describes the product quality, and logarithmizing the amplitude of the frequency distribution prior to the integrating step.
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17. A method of monitoring the product quality of a continuously produced product and comprising the steps of
generating a continuous test signal which is representative of a quality parameter of the product, digitizing the test signal, determining a frequency distribution from the digitized test signal, which indicates how often a specific value of the test signal occurs, integrating the frequency distribution to derive a statistically relevant feature which describes the product quality, and temporarily storing the values of the test signal.
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18. A method of monitoring the product quality of a continuously produced product and comprising the steps of
generating a continuous test signal which is representative of a quality parameter of the product, digitizing the test signal, determining a frequency distribution from the digitized test signal, which indicates how often a specific value of the test signal occurs, integrating the frequency distribution to derive a statistically relevant feature which describes the product quality, and wherein the step of generating a continuous test signal includes generating a plurality of such test signals representing respective quality parameters of the product, with each of the test signals being subjected to the digitizing, determining, and integrating steps.
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19. A method of monitoring the product quality of a continuously produced product and comprising the steps of
generating a continuous test signal which is representative of a quality parameter of the product, digitizing the test signal, determining a frequency distribution from the digitized test signal, which indicates how often a specific value of the test signal occurs, integrating the frequency distribution to derive a statistically relevant feature which describes the product quality, and determining the mean value and standard deviation of the derived statistically relevant feature.
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20. An apparatus for monitoring the product quality of a continuously produced product and comprising
a test unit for generating a continuous test signal which is representative of a quality parameter of the product, a signal processor for digitizing the test signal, determining a frequency distribution from the digitized test signal which indicates how often a specific value of the test signal occurs, and integrating the frequency distribution to derive a statistically relevant feature which describes the product quality, said signal processor including an analog-digital converter, a multiplexer, a logarithmizing circuit, an evaluation device, and a display device for the derived statistically relevant feature.
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21. An apparatus for monitoring the product quality of a continuously produced product and comprising
a test unit for generating a continuous test signal which is representative of a quality parameter of the product, a signal processor for digitizing the test signal, determining a frequency distribution from the digitized test signal which indicates how often a specific value of the test signal occurs, and integrating the frequency distribution to derive a statistically relevant feature which describes the product quality, said signal processor including at least two memory units for storing the test signal and the amplitude of the frequency distribution.
Specification