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    • 4. 发明授权
    • Differential frequency meter
    • 差分频率计
    • US3681689A
    • 1972-08-01
    • US86624869
    • 1969-10-14
    • COMMISSARIAT ENERGIE ATOMIQUE
    • CORREARD DANIELFRIESS EMMANUELSALVI ANTOINETREGOURES ROGER
    • G01R23/14G01R23/00G01R23/02G01R33/022G01R33/24G01N23/02G01N23/14
    • G01R33/022G01R23/00G01R23/02H03F2200/261
    • Apparatus for measuring the frequency difference (F1 - F2) between two signals comprises two frequency change ways, each having generator means providing reference signals at frequencies fR1 and fR2 respectively higher than F1 and F2, first mixing means respectively receiving F1 and fR1, or F2 and fR2 signals, and low pass filter means fed by said first mixing means and selecting the frequency (fR1 - F1) or (fR2 - F2). The apparatus also has a common frequency change way receiving the said signals at frequencies (fR1 - F1) and (fR2 - F2) and having second mixing means of frequency (FR1 - F1) and (fR2 - F2) signals, low-pass filter means fed by second mixing means and selecting the frequency (fR1 - F1) - (fR2 - F2) and means for measuring the (fR1 - F1) - (fR2 - F2) frequency.
    • 用于测量两个信号之间的频率差(F1-F2)的装置包括两个频率改变方式,每个发生装置具有分别高于F1和F2的频率fR1和fR2的参考信号,第一混合装置分别接收F1和fR1或F2 和fR2信号,以及由所述第一混合装置馈送并选择频率(fR1-F1)或(fR2-F2)的低通滤波器装置。 该装置还具有以频率(fR1-F1)和(fR2-F2)接收所述信号并具有频率(FR1-F1)和(fR2-F2)信号的第二混频装置的共同频率改变方式,低通滤波器 通过第二混合装置馈送并且选择频率(fR1-F1) - (fR2-F2)的装置和用于测量(fR1-F1) - (f R2-F2)频率的装置。
    • 9. 发明授权
    • System and method for measuring ash content and calorified value of coal
    • 测量煤灰含量和煤热值的系统和方法
    • US08953741B2
    • 2015-02-10
    • US13656177
    • 2012-10-19
    • Tsinghua University
    • Hongchang YiLin Qian
    • G01N23/087G01N23/12G01N23/14G01N23/083G01N33/22
    • G01N23/083G01N33/222G01N2223/617G01N2223/643
    • A system and a method for measuring an ash content and a calorific value of a coal are provided. The system comprises: at least two dual-energy gamma ray transmission measuring devices and a computing device, in which at least one first dual-energy gamma ray transmission measuring device is disposed before an inlet of a coal combustion apparatus for measuring a first attenuation coefficient of a gamma ray from the at least one first dual-energy gamma ray transmission measuring device with regard to the coal; at least one second dual-energy gamma ray transmission measuring device is disposed after an outlet of the coal combustion apparatus for measuring a second attenuation coefficient of a gamma ray from the at least one second dual-energy gamma ray transmission measuring device with regard to a coal ash; and the computing device is configured to compute the ash content and the calorific value of the coal.
    • 提供了一种用于测量煤的灰分含量和发热量的系统和方法。 该系统包括:至少两个双能γ射线透射测量装置和计算装置,其中至少一个第一双能量γ射线透射测量装置设置在用于测量第一衰减系数的煤燃烧装置的入口之前 来自所述至少一个第一双能量γ射线传输测量装置的关于煤的γ射线; 至少一个第二双能γ射线透射测量装置设置在煤燃烧装置的出口之后,用于测量来自至少一个第二双能γ射线透射测量装置的γ射线的第二衰减系数 煤灰; 并且计算装置被配置为计算煤的灰分含量和热值。