NEUTRON MEASUREMENT APPARATUS AND NEUTRON MEASUREMENT METHOD
First Claim
1. A neutron measurement apparatus comprising:
- an analogue signal processing system configured to amplify alternating current components of detector output signals output from a neutron detector, and to apply filtering to remove high frequency components from the output signals;
a digitizing processing system configured to digitize the output signals output from the analogue signal processing system at a constant sampling period in a time series;
a FFT calculation processing system configured to convert a certain number of the signals in a time domain output from the digitizing processing system into signals in a frequency domain, and to apply filtering to the signals in the frequency domain; and
a signal processing system configured to select and extract signals having required frequency components through the calculation processing on the FFT calculation processing system, so as to calculate power spectral densities of the extracted signals, and to convert the calculated power spectral densities into a neutron measurement value.
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Abstract
A neutron measurement apparatus includes: an analog signal processor; a digitizing processor; an FFT calculation processor; and a signal processor. The analog signal processor amplifies alternating current components of detector output signals output from a neutron detector, and filters to remove high frequency components from the output signals, which the digitizing processor digitizes at a constant sampling period in a time series; the FFT calculation processor converts certain of the signals in a time domain from the digitizing processor into signals in a frequency domain, and filters the signals in the frequency domain; and the signal processor selects and extracts signals having required frequency components through the calculation processing on the FFT calculation processor, to calculate power spectral densities of the extracted signals, and to convert the calculated power spectral densities into a neutron measurement value.
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Citations
13 Claims
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1. A neutron measurement apparatus comprising:
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an analogue signal processing system configured to amplify alternating current components of detector output signals output from a neutron detector, and to apply filtering to remove high frequency components from the output signals; a digitizing processing system configured to digitize the output signals output from the analogue signal processing system at a constant sampling period in a time series; a FFT calculation processing system configured to convert a certain number of the signals in a time domain output from the digitizing processing system into signals in a frequency domain, and to apply filtering to the signals in the frequency domain; and a signal processing system configured to select and extract signals having required frequency components through the calculation processing on the FFT calculation processing system, so as to calculate power spectral densities of the extracted signals, and to convert the calculated power spectral densities into a neutron measurement value. - View Dependent Claims (2, 3, 9, 11)
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4. A neutron measurement apparatus comprising:
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a preamplifier configured to amplify detector output signals from a neutron detector ; an AC amplifier configured to amplify alternating current components of the signals output from the preamplifier; an analogue filter device configured to remove high frequency components from the signals output from the AC amplifier; an AD converter configured to AD-convert the output signals from the analogue filter device at a constant sampling period into digital signals; a recorder configured to record the digital signals converted on the AD converter; a window function multiplier configured to read out a certain number of the digital signals from the recorder, and to multiply the digital signals by window function coefficients; an FFT device configured to apply fast Fourier transform processing to the output signals from the window function multiplier; a signal selecting device configured to select and extract only signals having required frequency components based on a calculation result of the FFT device; a power spectral density calculator configured to calculate power spectral densities of the signals selected and extracted on the signal selecting device; and a neutron signal converter configured to convert the output signals from the power spectral density calculator into a neutron measurement value. - View Dependent Claims (5, 6, 7, 8, 10, 12)
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13. A neutron measurement method comprising:
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amplifying alternating current components of detector output signals output from a neutron detector, and applying filtering to the output signals to remove high frequency components from the output signals on an analogue signal processing system; digitizing the processed detector output signals at a constant sampling period in a time series on a digitizing processing system; applying fast Fourier transform (FFT) processing to the digitized signals in a time domain to convert the signals into signals in a frequency domain on an FFT calculation processing system, and applying filtering to the FFT-processed signals in the frequency domain; and selecting and extracting signals having required frequency components from the FFT-processed signals in the frequency domain, so as to calculate power spectral densities of the extracted signals, and obtain a neutron measurement value based on the power spectral densities of the extracted signals.
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Specification