Patent ID: 7388210
Filing Date: 2008-06-17
Classification: G01T

Abstract:
1. A processing circuit for a spectrometry chain including a particle radiation detector ( 21 ), including a charge preamplifier stage ( 20 ) receiving a pulsed current (I 1 ) from the detector, representative of the amount of charges emitted by a particle which has interacted with the detector, an integrator stage ( 26 ), a differentiator stage ( 25 ) connected to the charge preamplifier stage ( 20 ), the differentiator stage ( 25 ) receiving a signal (V 1 ) from the charge preamplifier stage ( 20 ) and delivering to the integrator stage ( 26 ), a signal (V 2 ), image of the detector current (I 1 ), the integrator stage ( 26 ) delivering an image (V 3 ) of the amount of charges emitted by a particle which has interacted with the detector, characterized in that the integrator stage ( 26 ) is formed with an integrator which cooperates with means ( 28 , 29 ), SW′ 1 , SW′ 2 ) for controlling the integration time substantially during the duration of each pulse of the detector current, the differentiator stage ( 25 ) being directly connected to the assembly formed with the integrator and means for controlling the integration time, the differentiator stage ( 25 ) and the assembly forming a band-pass filter with self-adaptive time constants.