Use of higher order signal moments and a high speed digital sampling technique for neutron flux measurements

Bruno Bärs, Gutierrez Rivero, Santana, Jimenez, R. Carrillo Mendoza

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

The second (conventional variance or Campbell signal), the third, and the modified fourth order central signal moments associated with the amplified and filtered currents from two electrodes of an ex-core neutron sensitive fission detector were measured versus the reactor power of the 1-MW TRIGA reactor in Mexico City.
Two channels of a high-speed (400-MHz) multiplexing data sampler and an analog-to-digital converter with 12-b resolution and 1-Mword buffer memory were used. The data were further retrieved into a PC, and estimates for autocorrelation and cross-correlation moments up to the fifth order, coherence, skewness, excess, etc., quantities were calculated offline. Five-mode operation of the detector was achieved, including conventional counting rates and currents in agreement with theory and the authors' previous results with analog techniques.
The signals are proportional to the neutron flux and reactor power in some flux ranges. The suppression of background noise is improved and the lower limit of the measurement range is extended as the order of moment is increased, in agreement with theory.
Original languageEnglish
Pages (from-to)832-839
JournalIEEE Transactions on Nuclear Science
Volume40
Issue number4
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

Fingerprint

Neutron flux
flux (rate)
power reactors
sampling
high speed
Sampling
Detectors
moments
Digital to analog conversion
Multiplexing
Autocorrelation
Neutrons
samplers
skewness
detectors
rangefinding
analog to digital converters
Mexico
background noise
Fluxes

Cite this

Bärs, Bruno ; Rivero, Gutierrez ; Jimenez, Santana, ; Carrillo Mendoza, R. / Use of higher order signal moments and a high speed digital sampling technique for neutron flux measurements. In: IEEE Transactions on Nuclear Science. 1993 ; Vol. 40, No. 4. pp. 832-839.
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abstract = "The second (conventional variance or Campbell signal), the third, and the modified fourth order central signal moments associated with the amplified and filtered currents from two electrodes of an ex-core neutron sensitive fission detector were measured versus the reactor power of the 1-MW TRIGA reactor in Mexico City. Two channels of a high-speed (400-MHz) multiplexing data sampler and an analog-to-digital converter with 12-b resolution and 1-Mword buffer memory were used. The data were further retrieved into a PC, and estimates for autocorrelation and cross-correlation moments up to the fifth order, coherence, skewness, excess, etc., quantities were calculated offline. Five-mode operation of the detector was achieved, including conventional counting rates and currents in agreement with theory and the authors' previous results with analog techniques. The signals are proportional to the neutron flux and reactor power in some flux ranges. The suppression of background noise is improved and the lower limit of the measurement range is extended as the order of moment is increased, in agreement with theory.",
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Use of higher order signal moments and a high speed digital sampling technique for neutron flux measurements. / Bärs, Bruno; Rivero, Gutierrez; Jimenez, Santana,; Carrillo Mendoza, R.

In: IEEE Transactions on Nuclear Science, Vol. 40, No. 4, 1993, p. 832-839.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Use of higher order signal moments and a high speed digital sampling technique for neutron flux measurements

AU - Bärs, Bruno

AU - Rivero, Gutierrez

AU - Jimenez, Santana,

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AB - The second (conventional variance or Campbell signal), the third, and the modified fourth order central signal moments associated with the amplified and filtered currents from two electrodes of an ex-core neutron sensitive fission detector were measured versus the reactor power of the 1-MW TRIGA reactor in Mexico City. Two channels of a high-speed (400-MHz) multiplexing data sampler and an analog-to-digital converter with 12-b resolution and 1-Mword buffer memory were used. The data were further retrieved into a PC, and estimates for autocorrelation and cross-correlation moments up to the fifth order, coherence, skewness, excess, etc., quantities were calculated offline. Five-mode operation of the detector was achieved, including conventional counting rates and currents in agreement with theory and the authors' previous results with analog techniques. The signals are proportional to the neutron flux and reactor power in some flux ranges. The suppression of background noise is improved and the lower limit of the measurement range is extended as the order of moment is increased, in agreement with theory.

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