Doppler measurement instrument and doppler measurement processing method
First Claim
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1. A fluid flow measurement instrument, comprising:
- a sensor configured to measure a fluid flowing within a fluid channel, said sensor;
emitting a signal towards or into the fluid; and
producing a time domain signal representative of reflections of the emitted signal; and
a meter coupled to the sensor and comprising a processing system that is configured to;
receive the time domain signal;
successively decimate the time domain signal to generate a series of time domain decimated signal sets, wherein each successive decimation stage comprises a replica of a previous decimation stage and has an output sample rate lowered by a decimation factor;
thereafter compute a frequency transform for one or more of the series of time domain decimated signal sets, wherein each frequency transform provides a spectral quantification set having a different frequency resolution;
average spectral quantification sets associated with a frequency range to produce spectral estimates;
compute therefrom one or more frequency offset values; and
provide a fluid flow velocity estimate based upon the one or more frequency offset values so obtained.
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Abstract
A fluid flow measurement instrument is provided. The measurement instrument includes a sensor producing a time domain signal representative of reflections of an emitted signal; and a meter being coupled to the sensor and configured to: receive the time domain signal; create two or more spectral estimates for the time domain signal, wherein said two or more spectral estimates have different frequency ranges and resolutions; determine a frequency offset value using one or more of the two or more spectral estimates; and convert the frequency offset value into a fluid velocity. Other aspects are described and claimed.
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Citations
15 Claims
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1. A fluid flow measurement instrument, comprising:
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a sensor configured to measure a fluid flowing within a fluid channel, said sensor; emitting a signal towards or into the fluid; and producing a time domain signal representative of reflections of the emitted signal; and a meter coupled to the sensor and comprising a processing system that is configured to; receive the time domain signal; successively decimate the time domain signal to generate a series of time domain decimated signal sets, wherein each successive decimation stage comprises a replica of a previous decimation stage and has an output sample rate lowered by a decimation factor; thereafter compute a frequency transform for one or more of the series of time domain decimated signal sets, wherein each frequency transform provides a spectral quantification set having a different frequency resolution; average spectral quantification sets associated with a frequency range to produce spectral estimates; compute therefrom one or more frequency offset values; and provide a fluid flow velocity estimate based upon the one or more frequency offset values so obtained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A fluid flow measurement method, comprising:
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emitting, from a sensor configured to measure a fluid flowing within a fluid channel, a signal towards or into the fluid; producing a time domain signal representative of reflections of the emitted signal; successively decimating the time domain signal to generate a series of time domain decimated signal sets, wherein each successive decimation stage comprises a replica of a previous decimation stage and has an output sample rate lowered by a decimation factor; thereafter computing a frequency transform for one or more of the series of time domain decimated signal sets, wherein each frequency transform provides a spectral quantification set having a different frequency resolution; averaging spectral quantification sets associated with a frequency range to produce spectral estimates; computing therefrom one or more frequency offset values; and providing a fluid flow velocity estimate based upon the one or more frequency offset values so obtained. - View Dependent Claims (12, 13, 14)
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15. A program product for fluid flow measurement, comprising:
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a non-transitory, device readable program storage device storing device readable program code, the device readable program code being executable by a processor and comprising; device readable program code configured to emit, from a sensor configured to measure a fluid flowing within a fluid channel, a signal towards or into the fluid; device readable program code configured to produce a time domain signal representative of reflections of the emitted signal; device readable program code configured to successively decimate the time domain signal to generate a series of time domain decimated signal sets, wherein each successive decimation stage comprises a replica of a previous decimation stage and has an output sample rate lowered by a decimation factor; device readable program code configured to thereafter compute a frequency transform for one or more of the series of time domain decimated signal sets, wherein each frequency transform provides a spectral quantification set having a different frequency resolution; device readable program code configured to average spectral quantification sets associated with a frequency range to produce spectral estimates; device readable program code configured to compute therefrom one or more frequency offset values; and device readable program code configured to provide a fluid flow velocity estimate based upon the one or more frequency offset values so obtained.
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Specification