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    Apparatus and method for measuring the ratio of two signals
    31.
    发明授权
    Apparatus and method for measuring the ratio of two signals 失效
    用于测量两个信号的比率的装置和方法

    公开(公告)号：US4272197A

    公开(公告)日：1981-06-09

    申请号：US70514

    申请日：1979-08-28

    Applicant: Karl Knop

    Inventor： Karl Knop

    IPC: G01J1/16 ,  G06G7/24 ,  G01N21/59

    CPC classification number: G06G7/24 ,  G01J1/16

    Abstract: The ratio of the intensity of two light beams is determined by an apparatus which includes a chopper wheel for chopping one of the light beams, a photodetector for detecting the intensity of both light beams applied simultaneously thereto, and a logarithmic amplifier for amplifying the current produced by the photodetector. The AC component of the logarithmically amplified current represents the ratio of the intensity of the two light beams.

    Abstract translation: 两个光束的强度的比例由包括用于切割光束中的一个的斩波轮的装置确定，用于检测同时施加的两个光束的强度的光电检测器和用于放大产生的电流的对数放大器 通过光电检测器。 对数放大电流的AC分量表示两个光束的强度之比。

    Dual wavelength photometer response circuit
    32.
    发明授权
    Dual wavelength photometer response circuit 失效
    双波长光电子反应电路

    公开(公告)号：US3804535A

    公开(公告)日：1974-04-16

    申请号：US29727972

    申请日：1972-10-13

    Applicant: BAXTER LABORATORIES INC

    Inventor： RODRIGUEZ R

    IPC: G01J3/42 ,  G01J1/16 ,  G01N21/27 ,  G01N21/31 ,  G01N33/16

    CPC classification number: G01J1/16 ,  G01N21/27 ,  G01N21/314

    Abstract: An apparatus to measure the difference in intensity between periodically recurring reference and measure light pulses of different wavelength reaching a photomultiplier tube, the apparatus having alternately keyed steady voltage-generating circuits keyed in synchronism with the light pulses and generating concurrent steady d.c. electrical signals with amplitudes corresponding to the light pulse intensities which are furnished to the respective inputs of a differential amplifier. The output of the differential amplifier is therefore a steady signal representing the difference in intensity between the reference and measure light pulses.

    Abstract translation: 一种用于测量周期性重复参考之间的强度差并测量到达光电倍增管的不同波长的光脉冲的装置，该装置具有与光脉冲同步的键控的稳压产生电路并产生并行稳定的直流。 具有对应于提供给差分放大器的相应输入的光脉冲强度的幅度的电信号。 因此，差分放大器的输出是表示参考和测量光脉冲之间的强度差的稳定信号。

    Color measuring with memory
    33.
    发明授权
    Color measuring with memory 失效
    颜色测量与记忆

    公开(公告)号：US3744919A

    公开(公告)日：1973-07-10

    申请号：US3744919D

    申请日：1971-07-16

    Applicant: HANSCOM G ,  MAGNUSON G ,  MAGNUSON R ,  THOMSON L ,  TRUSTEES OF THE ESTATE OF ROY

    Inventor： BABB R

    IPC: G01J1/16 ,  G01J3/10 ,  G01J3/51 ,  G01J3/48 ,  G01N21/48

    CPC classification number: G01J3/10 ,  G01J1/16 ,  G01J3/51

    Abstract: A manually operable direct reading apparatus and method providing reflectance measurements in two spectral modes, for example red and green without the use of high speed rotating filters, light choppers and synchronizing devices. The signal corresponding to one of these modes is stored in a memory for comparison with the signal from the other mode. Ratios between these modes are automatically computed and displayed either as a mathematical ratio or as a numerical value.

    Abstract translation: 一种可手动操作的直接读取装置和方法，其以两种光谱模式提供反射率测量，例如红色和绿色，而不使用高速旋转滤光器，光斩波器和同步装置。 对应于这些模式之一的信号被存储在存储器中以与来自另一模式的信号进行比较。 这些模式之间的比率将自动计算并显示为数学比例或数值。

    Dark current correction circuit for photosensing devices
    34.
    发明授权
    Dark current correction circuit for photosensing devices 失效
    用于摄影装置的暗电流校正电路

    公开(公告)号：US3684378A

    公开(公告)日：1972-08-15

    申请号：US3684378D

    申请日：1970-09-04

    Applicant: JOSEPH S LORD

    Inventor： LORD JOSEPH S

    IPC: G01J1/16 ,  G01J1/36 ,  H03F1/30 ,  G01J3/42

    CPC classification number: G01J1/16 ,  G01J1/36 ,  H03F1/303

    Abstract: In a flicker-type photosensing device, photosensor dark current is corrected for by applying the output of the photosensor to a current-to-voltage mode amplifier including a special dark current correction loop. In particular, the amplifier has connected between its input and output terminals a loop including a resistor, a grounded capacitor, a gating arrangement adapted to close the loop only during those periods when no light beam is applied to the photosensor, and a second resistor for limiting the capacitor charging rate. In operation, the capacitor charges while the gate is closed during the dark period; and, during pulse periods when the gate is open, it discharges to reduce the photosensor current by an amount nearly equal to the dark current.

    Abstract translation: 在闪烁型感光装置中，通过将光传感器的输出施加到包括特殊暗电流校正环的电流 - 电压模式放大器来校正光电传感器暗电流。 特别地，放大器已经在其输入和输出端之间连接一个环路，该环路包括电阻器，接地电容器，仅在没有光束施加到光电传感器的那些周期期间闭合环路的选通装置，以及第二电阻器 限制电容充电率。 在操作中，在黑暗期间门关闭时，电容器充电; 并且在栅极断开的脉冲周期期间，其放电以将光电传感器电流减小几乎等于暗电流的量。

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