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    • 6. 发明授权
    • Light source, optical window, and detector configuration for measurement of a medium
    • 用于测量介质的光源,光学窗口和检测器配置
    • US06462350B1
    • 2002-10-08
    • US09497108
    • 2000-02-03
    • Bernd Stenkamp
    • Bernd Stenkamp
    • G01N1506
    • G01N21/53
    • The invention concerns an opto-electronic sensor, in particular for the measurement of opaqueness in a medium, having a transmitter channel (6) irradiating light waves along a first axis (20) and with at least one receiver channel (8, 10) which detects light waves interacting with the medium and which cooperates within an evaluation unit. In order to optically isolate the transmitter and receiver channels from each other, the sensor is configured in such a fashion that a common window (12) made from an optically transparent material is provided for sealing the transmitter channel (6) and the receiver channel (8, 10) with respect to the medium to be measured and for coupling in and coupling out the light waves. The inner border surface (16) of the window (12) facing the receiver channel (8, 10) is adjacent to an optically thinner medium and is oriented relative to the outer border surface (14) of the window (12) directly adjacent to the medium to be measured and with respect to the orientation of the first axis (20) relative to this outer border surface (14), in such a manner that light waves (D-TR) from the transmitter channel (6) which are reflected back into the window (12) from the outer border surface (14) are incident upon the inner border surface (16) at an angle of incidence (&agr;2) which is larger than the critical angle for total internal reflection so that they do not enter into the receiver channel (8, 10), but are once more reflected.
    • 本发明涉及光电传感器,特别是用于测量介质中的不透明度,其具有沿着第一轴线(20)照射光波的发射器通道(6)和至少一个接收器通道(8,10),所述至少一个接收器通道 检测与介质相互作用并在评估单元内协作的光波。 为了将发射器和接收器通道彼此光学地隔离,传感器被配置为使得由光学透明材料制成的公共窗口(12)被设置用于密封发射器通道(6)和接收器通道( 8,10)相对于待测量的介质并耦合并耦合出光波。 窗口(12)的面向接收器通道(8,10)的内部边界表面(16)与光学更薄的介质相邻,并且相对于窗口(12)的外边界表面(14)定向,直接邻近 相对于第一轴线(20)相对于该外边界表面(14)的取向的介质,以使来自发射器通道(6)的光(D-TR)被反射的方式 从外部边界表面(14)返回到窗口(12)中的入射角(α2)入射到内部边界表面(16)上,该角度大于全内反射的临界角,使得它们不进入 进入接收机通道(8,10),但是再次被反映出来。