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"Figure 2.30 shows the time-resolved luminescence of Eu2+-doped Sr2Si5N8 measured at varying delay times."
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comehappyon(½ð±Ò+1): delay timeÃ²ËÆÊÇË¥¼õʱ¼ä£¬µ«ÊǾßÌåÓÐʲôÀíÂÛ·½ÃæµÄÀí½âô£¿ 2011-11-30 15:03:14
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comehappyon(½ð±Ò+2): Õâ¸öÌ«³éÏóÁË£¬ÊµÔÚ¿´²»Ã÷°×¡£ 2011-12-01 08:46:13
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1Â¥: Originally posted by comehappyon at 2011-11-30 14:32:07:
"Figure 2.30 shows the time-resolved luminescence of Eu2+-doped Sr2Si5N8 measured at varying delay times."
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Delay Lines
Delay lines, or a way to introduce time delays, are incorporated
into all TCSPC instruments. The need for delay lines
is easily understood by recognizing that there are significant
time delays in all components of the instrument. A
photoelectron pulse may take 20 ns to exit a PMT. Electrical
signals in a cable travel a foot in about 1 ns. It would be
difficult to match all these delays within a couple of
nanoseconds in the start and stop detector channels without
a way to adjust the delays. The need for matching delays
through the components is avoided by the use of calibrated
delay lines. Such delays are part of the NIM bin electronics.
However, lengths of coaxial cable are prone to picking up
RF interference.
Calibrated delay lines are also useful for calibration of
the time axis of the MCA. This is accomplished by providing
the same input signal to the start and stop channels of
the TAC. The preferred approach is to split an electrical signal,
typically from the start detector, and direct this signal
to both inputs of the TAC. Since the pulses arrive with a
constant time difference, one observes a single peak in the
MCA. One then switches the time delay in the start or stop
channel by a known amount, and finds the peak shift on the
MCA display. By repeating this process for several delay
times, the TAC and MCA can be calibrated.

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3Â¥2011-11-30 15:47:43
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xifang8231

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comehappyon(½ð±Ò+1): ¶÷£¬Ð»Ð»~ 2011-12-01 08:46:35
Ó¦¸ÃÊÇÄãµÄÓ«¹âÎïÖÊÒªºÍÀë×ÓEu2+Ö®¼äÓÐÏ໥µÄ×÷Óã¬Õâ¸ö×÷ÓÃÐèҪʱ¼äµÄ
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