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    • 6. 发明专利
    • Apparatus for detecting gas selectivity
    • 检测气体选择性的装置
    • JPS5926040A
    • 1984-02-10
    • JP13469682
    • 1982-08-03
    • Shinkosumosu Denki Kk
    • KITAGUCHI HISAO
    • G01N27/04G01N27/16G01N27/18G01N33/00
    • G01N33/0031
    • PURPOSE:To detect an aimed gas (CH4) with high accuracy, by adding two series resistance and compensating resistance to a bridge circuit connected so that the outputs of both sensors may become differential by two kinds of gas sensors and two resistors. CONSTITUTION:Resistors pi5, pi6 are connected in parallel with the first gas sensor pi1 and a resistor pi2 which are connected in series and a compensating resistor pi0 is inserted between a connecting point (c) of the gas sensor pi1 and the resistor pi2 and a connecting point (b) of the resistors pi5, pi6. An output V is generated between a connecting point (a) of the second gas sensor pi3 with a resistor pi4 and the connecting point (b). Resistance values of the resistors pi5, pi6 are selected so as to satisfy the following equation pi5/pi6=pi1/pi2 (=pi3/pi4) in the air. When either CH4 or H2 is mixed in the air, electric potential of the connecting points c and b, is displaced but the variation rate of the connecting point (b) is lowered by the resistor pi0. Then, the sensor pi1 desired to cancell for one gas (H2) is made accorded with the sensor pi3 by selecting suitably the value of the resistor pi0, and the aimed gas (CH4) is detected with high accuracy.
    • 目的:为了高精度地检测目标气体(CH4),通过增加两个串联电阻和对连接的桥接电路的补偿电阻,两个传感器的输出可能会被两种气体传感器和两个电阻差分。 构成:电阻器pi5,pi6与第一气体传感器pi1和串联连接的电阻器pi2并联,并且补偿电阻器pi0插入在气体传感器pi1的连接点(c)和电阻器pi2之间, 电阻器pi5,pi6的连接点(b)。 在第二气体传感器pi3的连接点(a)与电阻器pi4之间产生输出V和连接点(b)。 选择电阻器pi5,pi6的电阻值,以满足空气中的下列等式pi5 / pi6 = pi1 / pi2(= pi3 / pi4)。 当空气中混合CH4或H2时,连接点c和b的电位发生位移,但连接点(b)的变化率由电阻器pi0降低。 然后,通过适当地选择电阻器pi0的值,使希望取消一种气体(H2)的传感器pi1与传感器pi3一致,并且以高精度检测目标气体(CH4)。