The photon-counting technique is used where light intensity is extremely low (i.e., in the range of pW to nW) and widely applied in the field of meteorology, space, biotechnology, quantum information, and medical. Various quantum metrology laboratories and research institutes working in the low-intensity light measurement use commercially available SR400 gated photon-counting systems due to their high-count rates (200 MHz) and ability to detect pulses of the order of up to 5 ns. Low-level light detectors (such as photomultiplier tube and avalanche photodiode) generate a discrete pulse output. The manual counting of these pulses from the photon counter is both time-consuming and challenging. This article reports the instrument control LabVIEW program designed to operate the two gates (A and B) of the SR400 gated photon counter. Histogram plot, mean count, standard deviation, and type A uncertainty calculation features are incorporated. This program is useful for photon-counting applications where continuous monitoring and relative variations need to be studied, which is not possible with the standalone SR400.

光子计数技术用于光强度极低（即pW到nW范围内）的地方，广泛应用于气象、空间、生物技术、量子信息和医学领域。从事低强度光测量的各种量子计量实验室和研究机构使用市售的 SR400 门控光子计数系统，因为它们具有高计数率 (200 MHz) 和检测高达 5 ns 数量级脉冲的能力。低电平光检测器（如光电倍增管和雪崩光电二极管）产生离散脉冲输出。从光子计数器手动计数这些脉冲既耗时又具有挑战性。本文报告了仪器控制 LabVIEW 程序，该程序旨在操作 SR400 门控光子计数器的两个门（A 和 B）。直方图，包含平均计数、标准偏差和 A 类不确定度计算功能。该程序对于需要研究连续监测和相对变化的光子计数应用非常有用，而这对于独立的 SR400 来说是不可能的。