Methods and apparatus to generate an acoustic emission spectrum using chirp demodulation
AssigneeFisher Controls International LLC
InventorBret Anthony Dahme
Life of this patent
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Abstract
Methods, apparatus, and articles of manufacture are disclosed. An example pre-amplifier includes a demodulator to combine a chirp signal with an acoustic emission signal to generate a sideband acoustic emission signal, sample spectral data of the sideband acoustic emission signal at an intermediate center frequency in an intermediate frequency bandwidth, and generate demodulated acoustic emission data based on mapping the sampled spectral data to a measurement center frequency, the measurement center frequency different from the intermediate center frequency, and a transmitter to transmit the demodulated acoustic emission data to a computing device.
Claims24
A pre-amplifier comprising:
- a demodulator to:
- combine a chirp signal with an acoustic emission signal to generate a sideband acoustic emission signal;
- sample spectral data of the sideband acoustic emission signal at an intermediate center frequency in an intermediate frequency bandwidth;
- and
- generate demodulated acoustic emission data based on mapping the sampled spectral data to a measurement center frequency, the measurement center frequency different from the intermediate center frequency;
- and
- a transmitter to transmit the demodulated acoustic emission data to a computing device.
A non-transitory computer readable storage medium comprising instructions that, when executed, cause a pre-amplifier to at least:
- combine a chirp signal with an acoustic emission signal to generate a sideband acoustic emission signal;
- sample spectral data of the sideband acoustic emission signal at an intermediate center frequency in an intermediate frequency bandwidth;
- generate demodulated acoustic emission data based on mapping the sampled spectral data to a measurement center frequency, the measurement center frequency different from the intermediate center frequency;
- and
- transmit the demodulated acoustic emission data to a computing device.
A method comprising:
- combining a chirp signal with an acoustic emission signal with a pre-amplifier to generate a sideband acoustic emission signal;
- sampling spectral data of the sideband acoustic emission signal at an intermediate center frequency in an intermediate frequency bandwidth;
- generating demodulated acoustic emission data based on mapping the sampled spectral data to a measurement center frequency, the measurement center frequency different from the intermediate center frequency;
- and
- transmitting the demodulated acoustic emission data to a computing device.
Dependencies are inferred from the claim text.