High resolution, high rate X-ray spectrometer
- Lafayette, CA
- Pinole, CA
A pulse processing system (10) for use in an X-ray spectrometer in which a ain channel pulse shaper (12) and a fast channel pulse shaper (13) each produce a substantially symmetrical triangular pulse (f, p) for each event detected by the spectrometer, with the pulse width of the pulses being substantially independent of the magnitude of the detected event and with the pulse width of the fast pulses (p) being substantially shorter than the pulse width of the main channel pulses (f). A pile-up rejector circuit (19) allows output pulses to be generated, with amplitudes linearly related to the magnitude of the detected events, whenever the peak of a main channel pulse (f) is not affected by a preceding or succeeding main channel pulse, while inhibiting output pulses wherein peak magnitudes of main channel pulses are affected by adjacent pulses. The substantially symmetrical triangular main channel pulses (f) are generated by the weighted addition (27-31) of successive RC integrations (24, 25, 26) of an RC differentiated step wave (23). The substantially symmetrical triangular fast channel pulses (p) are generated by the RC integration ( 43) of a bipolar pulse (o) in which the amplitude of the second half is 1/e that of the first half, with the RC time constant of integration being equal to one-half the width of the bipolar pulse.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Number(s):
- US 4658216
- OSTI ID:
- 866218
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10
12
13
19
23
24
25
26
27-31
43
addition
adjacent
affected
allows
amplitude
amplitudes
bipolar
bipolar pulse
channel
channel pulse
channel pulses
circuit
constant
detected
detected event
detected events
differentiated
equal
event
events
fast
fast channel
generated
half
independent
inhibiting
integration
integrations
linearly
linearly related
magnitude
magnitudes
main
main channel
one-half
output
output pulse
output pulses
peak
pile-up
preceding
processing
produce
pulse
pulse processing
pulse shape
pulse shaper
pulse width
pulses
rate
rejector
related
resolution
shaper
shorter
spectrometer
step
substantially
substantially independent
substantially symmetrical
succeeding
successive
symmetrical
time
time constant
triangular
wave
weighted
whenever
width
x-ray
x-ray spectrometer