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Line noise analysis and detection and measurement error reduction

A noise component and line technology, applied in noise figure or signal-to-noise ratio measurement, physical parameter compensation/prevention, code conversion, etc., can solve problems such as slow update rate, undesired, and increased power consumption of process measurement systems

Active Publication Date: 2012-03-14
ROSEMOUNT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, constant filtering (e.g., a decimation filter) reduces the update rate and can increase the power consumption of the process measurement system
In general, a slower update rate is less desirable than a faster update rate

Method used

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  • Line noise analysis and detection and measurement error reduction
  • Line noise analysis and detection and measurement error reduction
  • Line noise analysis and detection and measurement error reduction

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Embodiment Construction

[0013] In general, the present invention provides a system and method for detecting, analyzing and reducing line noise in sensor signals. The present invention can help reduce the undesired effects of line noise coupled with substantially DC processes or data signals that are digitized by analog-to-digital (A / D) converters. The above may include adjusting the sampling rate of the A / D converter, and may also include adjusting the decimation period of a filter associated with the A / D converter to reduce sensor signal errors due to line noise components of the sensor signal. Systems according to the present invention may include circuitry configured to automatically perform various associated noise detection, analysis and reduction functions. In one aspect of the invention, a method comprises: sensing a process parameter to generate a sensor signal comprising a process signal and a line noise component; digitizing the sensor signal at a sampling rate; detecting a line noise zero ...

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Abstract

A method includes sensing a process parameter to generate a sensor signal that includes a process signal and line noise components (102), digitizing the sensor signal at a sample rate (102), detecting line noise zero crossings in the sensor signal (104), determining a line noise frequency as a function of the detected line noise zero crossings (106), and adjusting the sample rate as a function of the line noise frequency to reduce an impact of line noise on the digitized sensor signal (110).

Description

Background technique [0001] The present invention relates to noise management and, more particularly, to sensor measurement conditioning due to the noise signature of line noise coupled with sensor signals. [0002] Sensors are used in a variety of settings, such as monitoring processes in industrial process equipment, to generate data signals. These data signals may be transmitted to circuitry that performs digitization, analysis, communication delay, or other functions. For data acquisition, fast updating yet highly accurate process measurements are generally desired. In the field of industrial process measurement, an update generally refers to the transmission of information to a control room or other control device, and a given process update can include multiple discrete sensor measurements tied together, multiple discrete sensor measurements averaged together and many more. [0003] However, line noise can often couple with the data signal from the sensor during opera...

Claims

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Application Information

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IPC IPC(8): G01R29/26G01R13/06
CPCH03M1/08H03M1/1255
Inventor 杰森·哈洛德·鲁德道格拉斯·韦恩·阿恩岑
Owner ROSEMOUNT INC