
闪烁频率
Nowadays, the photoelectric flame detector is widely used in the power plants. The principle is to analyze the intensity or flicker frequency of radiation.
目前国内外电厂使用的多为光电式火焰检测器,其原理是分析火焰燃烧时辐射光的强度或闪烁频率。
At present, our country power quality national standard was chiefly stipulated five quotas: frequency, harmonic and voltage deviation, three-phase unbalance and the voltage fluctuation and flicker.
目前我国电能质量国家标准主要规定了五个指标:频率、谐波、电压偏差、三相不平衡及电压波动与闪变。
Second , the noise of double balanced mixer was analyzed, which involved analysis of low frequency flicker noise and high frequency thermal noise.
接着对双平衡混频器的噪声进行理论分析,包括低频闪烁噪声和高频热噪声。
This method not only can achieve the distortionless envelope detection of voltage flicker, but also can detect the time, frequency and amplitude of the signal accurately.
该方法不仅能够对电压闪变信号进行不失真地包络检波,而且能够精确地检测电压闪变信号的时间和包络信号的频率分量及其幅度。
It covers five aspects: supply voltage tolerance, utility harmonic, three-phase voltage unbalance, power system frequency tolerance, voltage fluctuation and flicker.
它涵盖五个方面:供电电压允许偏差、公用电网谐波、三相电压不平衡度、电力系统频率允许偏差、电压允许波动和闪变。
在电气工程和照明技术领域,“flicker frequency”(闪烁频率)指光源亮度随时间周期性波动的速率,其单位为赫兹(Hz)。这种现象主要由交流电供电系统引起,例如普通白炽灯在50Hz交流电下会产生每秒100次的亮度波动(因电流方向每周期改变两次)。
该参数对视觉健康至关重要。国际照明委员会(CIE)的研究表明,当闪烁频率低于80Hz时,人眼可能感知到光线抖动,长期暴露可能引发头痛、眼疲劳等不适症状。现代LED照明系统通过驱动电路优化,可将闪烁频率提升至1000Hz以上,有效消除可察觉的闪烁现象。
在显示技术中,国际电工委员会(IEC)制定的62471标准明确规定:显示器件的闪烁频率应高于90Hz以确保视觉舒适度。航空管制系统等特殊场景则要求设备达到200Hz以上的超高刷新率,防止关键信息显示出现残影。
“Flicker frequency”是一个技术性术语,主要用于描述光源或显示设备的闪烁特性。以下是详细解释:
Flicker(闪烁)
Frequency(频率)
Flicker frequency 指光源或显示设备中光线明暗交替的频率,即每秒闪烁的次数。例如:
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