Low power vibration sensor and wireless transmitter system
First Claim
1. A measurement instrument for communicating over a control protocol network, the control protocol network configured to transfer control protocol data in a control protocol to and from at least one gateway, the measurement instrument comprising:
- a sensor circuit for sensing a parameter of a machine and producing a dynamic signal based on the sensed parameter;
an analog to digital converter for receiving the dynamic signal and for converting the dynamic signal to a digital signal having a plurality of data points;
a digital filtering circuit for splitting the digital signal into a first filtered signal having a first frequency range bounded by a first lower frequency and a first upper frequency, and a second filtered signal having a second frequency range bounded by a second lower frequency and a second upper frequency, where the first lower frequency is less than the second lower frequency and the first upper frequency is less than the second upper frequency;
a processor connected to receive the first filtered signal and the second filtered signal and configured for;
determining one or more peak amplitude levels of the second filtered signal over the second frequency range and producing peak amplitude level data in the control protocol, the peak amplitude level data representing the one or more determined peak amplitude levels,integrating the first filtered signal over the first frequency range resulting in an integrated signal; and
determining a root-mean-square value from the integrated signal and producing root-mean-square data in the control protocol, the root-mean-square data corresponding to the root-mean-square value; and
a communication module for communicating the peak amplitude level data and the root-mean-square data over the control protocol network.
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Accused Products
Abstract
A low power vibration sensor and wireless transmitter system has one or more sensors that sense parameters of a machine including vibration and produces dynamic signals representing the sensed parameters. The system converts the signals to a digital format, digitally filters the signals, and processes the signals. A processor determines a plurality of levels, which represent the characteristics of the signal such as the peak value of a predetermined set of data points of the digital signal. Together, the levels comprise a PeakVue waveform. The processor determines the peak level value for the PeakVue waveform. Also, a true root-mean-square is calculated as the signal is received at the processor. The peak level and the RMS value are communicated wirelessly by a communication module to a control protocol network such as a daisy chain HART or Fieldbus protocol network. The system power supply and the communication module power supply are separate and allow for low power operation.
49 Citations
21 Claims
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1. A measurement instrument for communicating over a control protocol network, the control protocol network configured to transfer control protocol data in a control protocol to and from at least one gateway, the measurement instrument comprising:
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a sensor circuit for sensing a parameter of a machine and producing a dynamic signal based on the sensed parameter; an analog to digital converter for receiving the dynamic signal and for converting the dynamic signal to a digital signal having a plurality of data points; a digital filtering circuit for splitting the digital signal into a first filtered signal having a first frequency range bounded by a first lower frequency and a first upper frequency, and a second filtered signal having a second frequency range bounded by a second lower frequency and a second upper frequency, where the first lower frequency is less than the second lower frequency and the first upper frequency is less than the second upper frequency; a processor connected to receive the first filtered signal and the second filtered signal and configured for; determining one or more peak amplitude levels of the second filtered signal over the second frequency range and producing peak amplitude level data in the control protocol, the peak amplitude level data representing the one or more determined peak amplitude levels, integrating the first filtered signal over the first frequency range resulting in an integrated signal; and determining a root-mean-square value from the integrated signal and producing root-mean-square data in the control protocol, the root-mean-square data corresponding to the root-mean-square value; and a communication module for communicating the peak amplitude level data and the root-mean-square data over the control protocol network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A measurement instrument for communicating over a control protocol network, the control protocol network configured to transfer control protocol data in a control protocol to and from at least one gateway, the measurement instrument comprising:
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a. a sensor circuit for sensing a parameter of a machine and producing a dynamic signal based on the sensed parameter; b. an analog to digital converter for receiving the dynamic signal and for converting the dynamic signal to a digital signal by sampling the dynamic signal at a rate of at least about 100,000 samples per second and at a twenty-four bit resolution; c. a digital filtering circuit for splitting the digital signal into a first filtered signal having a first frequency range bounded by a first lower frequency and a first upper frequency of about one kilohertz, and a second filtered signal having a second frequency range bounded by a second lower frequency of about one kilohertz and a second upper frequency, wherein the first lower frequency is less than the first upper frequency and the second lower frequency is less than the second upper frequency; d. a processor connected to receive the first filtered signal and the second filtered signal and configured for; i. producing a peak level waveform comprising a plurality of peak amplitude levels each corresponding to one of a plurality of predetermined, non-overlapping ranges of data points of the second filtered signal, ii. determining an overall peak amplitude level from the peak amplitude levels of the peak level waveform, iii. producing overall peak amplitude level data in a control protocol representing the overall peak amplitude level, iv. integrating the first filtered signal in the time domain over a second predetermined range of data points resulting in an integrated signal and v. determining a root-mean-square value from the integrated signal and producing root-mean-square data in the control protocol corresponding to the root-mean-square value; e. a power supply connected to power the processor and controlled by the processor to efficiently manage power consumption; and f. a communication module for communicating the level data and the root-mean-square data over the control protocol network.
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21. A method for communicating control protocol data indicating a machine condition over a control protocol network, the control protocol network configured to transfer the control protocol data in a control protocol to and from at least one gateway, the method comprising:
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a. sensing a parameter of the machine; b. producing a dynamic signal based on the sensed parameter; c. converting the dynamic signal to a digital signal having a plurality of data points; d. splitting the digital signal into a first filtered signal having a first frequency range and a second filtered signal having a second frequency range, the first frequency range having a first lower frequency and a first upper frequency, the second frequency range having a second lower frequency and a second upper frequency, where the first lower frequency is less than the second lower frequency and the first upper frequency is less than the second upper frequency; e. determining a peak amplitude level of the second filtered signal over the second frequency range and producing peak amplitude level data in the control protocol, the peak amplitude level data representing the determined peak amplitude level; f. integrating the first filtered signal over a second predetermined range of data points resulting in an integrated signal; g. determining a root-mean-square value from the integrated signal and producing root-mean-square data in the control protocol corresponding to the root-mean-square value; and h. communicating the peak amplitude level data and the root-mean-square data over the control protocol network.
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Specification