一种用于脉冲光探测磁共振的微处理器控制光子计数器。

A microprocessor-controlled photon counter for pulsed optically detected magnetic resonance.

作者信息

Power R K, Nishimura A M

机构信息

Department of Chemistry, Wichita State University, Wichita, Kansas 67208, USA.

出版信息

Rev Sci Instrum. 1979 Aug;50(8):969-71. doi: 10.1063/1.1135980.

DOI:10.1063/1.1135980

PMID:18699646

Abstract

In pulsed optically detected magnetic resonance (ODMR) spectroscopy, a lock-in amplifier is used to monitor the signal which is phase-matched to the duty cycle of an applied sequence of pulses. However, since the desired signals reside atop a much larger amplitude-modulated signal, lock-in amplification methods are difficult to use. Commerically available photon counters are of limited use, because the pulsed ODMR method requires sequential counting over several time intervals, often with minimum time delay between the intervals. The multiaccumulator photon counter described here is capable of such sequential counting over as many as four intervals. The microprocessor which controls the counter algebraically manipulates the photon counts during each of the duty cycles. The result is an inexpensive yet versatile photon counter which is suited for pulsed ODMR and other applications in which sequential counting is necessary.

摘要

在脉冲光探测磁共振（ODMR）光谱学中，锁相放大器用于监测与所施加脉冲序列的占空比相位匹配的信号。然而，由于所需信号位于幅度调制大得多的信号之上，锁相放大方法难以使用。市售的光子计数器用途有限，因为脉冲ODMR方法需要在几个时间间隔内进行顺序计数，且这些间隔之间通常具有最小时间延迟。这里描述的多累加器光子计数器能够在多达四个间隔内进行这种顺序计数。控制计数器的微处理器在每个占空比期间对光子计数进行代数运算。结果是得到一种价格低廉但用途广泛的光子计数器，适用于脉冲ODMR以及其他需要顺序计数的应用。