Apparatus and method for reducing microphonic susceptibility...

G - Physics – 01 – J

Patent

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G01J 1/00 (2006.01)

Patent

CA 2644568

The invention provides a system for removing or minimizing microphonic noise from a radiation detector signal, such as from a neutron detector, without creating excessive false counts in the electronics that count the radiation events. The system solves the microphonic noise problem using a 3-prong approach: (1) maintaining high dynamic range by avoiding large amplification and the possibility of saturation in the analog stages, (2) sampling the amplified analog signal using a high-resolution analog-to-digital converter (ADC), and (3) implementing a digital filtering algorithm that rejects the noise due to microphonics while passing the signal of interest from the neutron interactions.

L'invention concerne un système servant à supprimer ou minimiser le bruit microphonique d'un signal d'un détecteur de rayonnement, tel que d'un détecteur de neutrons, sans créer de faux comptes excessifs dans l'électronique qui compte les événements de rayonnement. Le système résout le problème du bruit microphonique en utilisant une approche à 3 fronts : (1) maintenir une gamme dynamique élevée en évitant une amplification importante et la possibilité d'une saturation dans les étapes analogiques, (2) échantillonner le signal analogique amplifié en utilisant un convertisseur analogique à numérique (ADC) à résolution élevée, et (3) appliquer un algorithme de filtrage numérique qui rejette le bruit dû à l'effet microphonique tout en passant le signal d'intérêt depuis les interactions de neutrons.

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