| 摘要 |
A photon measurement front-end circuit (200, 400, 800, 900) comprises an integration module (210, 410, 910), a comparator (220, 420, 810, 920), a transmission controller (230, 430, 820, 930), a negative feedback module (240, 440, 830, 940) and a photon measurement module (250, 450, 840, 950). The integration module (210, 410, 910) is used for receiving an initial signal from a photoelectric detector and a feedback signal from the negative feedback module (240, 440, 830, 940), integrate the difference between the initial signal and the feedback signal, and output an integral signal. The comparator (220, 420, 810, 920) is used for comparing the integral signal with a reference level and generating a comparison result. The transmission controller (230, 430, 820, 930) is used for controlling the transmission of the comparison result by using a clock signal, in order to output a digital signal. The negative feedback module (240, 440, 830, 940) is used for converting the digital signal into the feedback signal and feeding the feedback signal back to the integration module. The photon measurement module (250, 450, 840, 950) comprises an energy measurement module (251, 451), and the energy measurement module (251, 451) is used for measuring, by use of the digital signal, the energy of photons detected by the photoelectric detector. The above-mentioned photon measurement front-end circuit (200, 400, 800, 900) has a simple circuit structure, and therefore power consumption can be reduced and costs can be reduced. Besides, energy measurement is not affected by the starting time of the initial signal. |
