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Luminance decay evaluation of the phosphor screen with nanosecond afterglow for low-light-level image intensifier

TIANNING SU1, FENGGE LIU1,* , RONGSHENG ZHU1, BEIHONG LIU2, SHUAI CHENG1, MING JI1, JIE XIAO1, HANG ZHAO1, LISONG ZHANG1, LE CHANG2, HUIQING YANG1

Affiliation

  1. Department of Operation Support, North Night Vision Technology Co. Ltd., 650217, Kunming, CHN
  2. Department of Research and Development, North Night Vision Technology Co. Ltd., 650217, Kunming, CHN

Abstract

Luminance decay properties of phosphor screen for low-light-level (LLL) image intensifier is efficiently characterized by the objective measurement of afterglow time. Current measurement precision of afterglow time of phosphor screen for LLL image intensifier reaches only microsecond (μs) level. To achieve the measurement of afterglow time at nanosecond (ns) level, this paper has presented some effective strategies. By establishing luminance decay model of phosphor screen, main factors affecting afterglow time are given. Combining laser diode with signal generator whose sampling frequency of 250 megahertz (MHz), ns light pulse satisfying measurement requirements is generated. Using photomultiplier tube with rising and falling time of 0.57ns, high-speed analog-to –digital converter with sampling frequency of 500MHz, and transimpedance differential amplifier, photocurrent signal at microampere (μA) level has been perfectly processed. At last, through filtering noise accompanying luminance data and acquiring these data based on down sampling, the value of ns afterglow time of phosphor screen can be obtained. Specifically, ns afterglow time of P46 and P47 phosphor screen has been measured. Experimental results show that the average afterglow time of P46 and P47 phosphor screen are 329.79ns and 118.09ns, respectively. Both repetitive errors are 0.013 and 0.021, respectively. These measured data clearly demonstrate that effective evaluation of luminance decay of phosphor screen with ns afterglow time for LLL image intensifier can provide a strong tool for reasonable selection of high quality phosphor used in night vision devices..

Keywords

Luminance decay, nanosecond afterglow, phosphor screen, Low-light-level image intensifier.

Submitted at: Aug. 28, 2023
Accepted at: Feb. 12, 2024

Citation

TIANNING SU, FENGGE LIU, RONGSHENG ZHU, BEIHONG LIU, SHUAI CHENG, MING JI, JIE XIAO, HANG ZHAO, LISONG ZHANG, LE CHANG, HUIQING YANG, Luminance decay evaluation of the phosphor screen with nanosecond afterglow for low-light-level image intensifier, Journal of Optoelectronics and Advanced Materials Vol. 26, Iss. 1-2, pp. 28-35 (2024)