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    Collimator particularly for high resolution radioactivity distribution detection systems
    15.
    发明授权
    Collimator particularly for high resolution radioactivity distribution detection systems 失效
    特别适用于高分辨率放射性分布检测系统

    公开(公告)号：US3793520A

    公开(公告)日：1974-02-19

    申请号：US3793520D

    申请日：1972-01-27

    Applicant: BAIRD ATOMIC INC

    Inventor： GRENIER R

    IPC: G01T1/164 ,  G01T1/29 ,  G21K1/02 ,  G21F5/02

    CPC classification number: G01T1/2978 ,  G01T1/1644 ,  G21K1/025

    Abstract: Radiation emitted from a subject positioned on a programmable X, Y platform is directed through a multi-plane focused collimator and is detected by means of an array of sensing devices. The collimator comprises a registered stack of photoetched plates, each plate formed with a series of hole sets and each stack of hole sets defines downwardly converging collimator bores. One hole set is distinguished from another hole set by different hole profiles, each hole profile defining a specific focal length. The platform, which is in spaced relationship with the collimator, is moved incrementally along its X and Y axes in steps defining a programmed scanning pattern, each step being an integral multiple of the distance between adjacent sensing devices. The number of radioactive events detected at each step is temporarily held in a buffer memory and then applied to a digital data storage unit in a computer. Upon completion of the programmed scanning sequence, the stored data, which represents the radioactivity detected at various depth of the subject, is applied to a display for presentation as a composite half tone pictorial representation of the detected radioactive events.

    Abstract translation: 从位于可编程X，Y平台上的被摄体发射的辐射被引导通过多平面聚焦准直仪，并且通过感测装置的阵列来检测。 准直器包括注册的光刻板堆叠，每个板形成有一系列孔组，每个堆叠的孔组限定向下收敛的准直器孔。 一个孔组与另一个通过不同孔轮廓设置的孔不同，每个孔轮廓定义一个特定的焦距。 与准直器间隔开的平台沿着其X轴和Y轴沿着限定编程扫描图案的步骤逐渐移动，每个步距是相邻传感装置之间的距离的整数倍。 在每个步骤检测到的放射性事件的数量暂时保存在缓冲存储器中，然后施加到计算机中的数字数据存储单元。 在编程扫描序列完成时，将表示在被摄体的各种深度处检测到的放射性的存储数据应用于显示器以作为检测到的放射性事件的复合半色调图示表示。

    Forced zero subsystem, particularly for electro-optic background cancellation systems
    16.
    发明授权
    Forced zero subsystem, particularly for electro-optic background cancellation systems 失效
    强制零子系统，特别适用于电光背景取消系统

    公开(公告)号：US3650630A

    公开(公告)日：1972-03-21

    申请号：US3650630D

    申请日：1970-06-12

    Applicant: BAIRD ATOMIC INC

    Inventor： HABOSIAN KASPAR

    IPC: G01J3/28 ,  G01J3/30

    CPC classification number: G01J3/28

    Abstract: Line spectra and background energy superimposed thereon is alternately positioned ''''on'''' and ''''off'''' a slit. During the ''''off'''' period only background energy is positioned on the slit. Measuring and reference capacitors associated with photomultipliers, integrate the signal in such a manner that long time constant background energy is canceled. Short time constant background energy is canceled by detecting the polarity of the residual charge on the reference capacitor and by integrating, on each measuring capacitor, a signal representing the opposite polarity of the detected charge. In consequence, the residual charge on each of the measuring capacitors is driven to zero.

    Abstract translation: 叠加在其上的线谱和背景能量交替地定位在狭缝上“开”和“关”。 在“关闭”期间，只有背景能量位于狭缝上。 与光电倍增管相关联的测量和参考电容器以使得长时间恒定的背景能量被消除的方式集成信号。 通过检测参考电容器上的残余电荷的极性并且通过在每个测量电容器上积分表示检测到的电荷的相反极性的信号来消除短时间常数背景能量。 因此，将每个测量电容器上的剩余电荷驱动为零。

    Background suppression system for optical spectrometer
    17.
    发明授权
    Background suppression system for optical spectrometer 失效
    用于光学光谱仪的背景抑制系统

    公开(公告)号：US3588252A

    公开(公告)日：1971-06-28

    申请号：US3588252D

    申请日：1969-09-17

    Applicant: BAIRD ATOMIC INC

    Inventor： HABOSIAN KASPAR

    IPC: G01J3/28 ,  G01J3/20 ,  G01J3/30

    CPC classification number: G01J3/28

    Abstract: OPTICAL SPECTROMETERS CURRENTLY EMPLOY PHOTODETECTING DEVICES TO CHARGE CAPACITOR IN MEASURING THE INTENSITY OF MONITORED LINE SPECTRA. THE RADIANT ENERGY FALLING UPON THE PHOTODETECTORS, IN ADDITION TO THE SPECTRAL LINE OF INTEREST ALSO INCLUDES BACKGROUND ENERGY WHICH IS THE BANDSPECTRA SUPERIMPOSED ON THE LINE SPECTRA. THE BACKGROUND AMOUNTS TO NOISE AND ADVERSELY AFFECTS THE ACCURACY OF THE INSTRUMENT. THIS INVENTION INVOLVES THE ELIMINATION OF THE BACKGROUND NOISE BY OSCILLATING THE LINE SPECTRA ACROSS THE SLIP AND SEQUENTIALLY CHARGING AND DISCHARGING THE MEASURING CAPACI-

    TORS ASSOCIATED WITH THE PHOTODETECTORS TO AVERAGE OUT THE BACKGROUND NOISE.

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