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    • 2. 发明授权
    • Pyroelectric center of mass imaging
    • 热电成像中心
    • US5796104A
    • 1998-08-18
    • US812052
    • 1997-03-07
    • Andrew S. Filo
    • Andrew S. Filo
    • G01J5/34G01T5/10
    • G01J5/34
    • An apparatus and method for forming stabilized thermal images of thermally active objects in an objected scene using a pyroelectric detector and which does not require chopping or rapid panning. The invention includes focusing optics for focusing thermal radiation flux from a thermally active object under investigation onto a pyroelectric detector. The output signal generated by the pyroelectric detector is decoupled of its DC offset component. The output signal is then mixed with the results of the decoupled signal passing through a gain and level control. The result is that the invention acts to track and boost the decay in the pyroelectric image when the detector is staring at a static image. The resulting image is amplified to match the input requirements of a level detector that drives a selected thermal image display. In order to adequately display the thermal center of mass, the thermal image is combined with the visual image of the thermally active object under investigation. This is accomplished by overlaying the thermal image on the visual image using any number of conventional image combining techniques. Preferred image combining techniques include electro-optic combination (Relayed Image), optical combination (Virtual Image), or direct combination (Projected Image).
    • 一种使用热电检测器在对象场景中形成热活性物体的稳定热图像并且不需要斩波或快速平移的装置和方法。 本发明包括聚焦光学器件,用于将来自被研究的热活性物体的热辐射通量聚焦到热电探测器上。 由热电检测器产生的输出信号与其DC偏移分量去耦合。 然后将输出信号与去耦信号的结果混合通过增益和电平控制。 结果是,当检测器盯着静态图像时,本发明用于跟踪和升高热电图像中的衰减。 产生的图像被放大以匹配驱动所选热图像显示器的电平检测器的输入要求。 为了充分显示热质量中心,热图像与正在研究的热活性物体的视觉图像相结合。 这是通过使用任何数量的常规图像组合技术将热图像覆盖在视觉图像上来实现的。 优选的图像组合技术包括电光组合(中继图像),光学组合(虚拟图像)或直接组合(投影图像)。
    • 3. 发明授权
    • Zero-spaced epithermal neutron moisture detection system
    • 零间隔超热中子水分检测系统
    • US5483063A
    • 1996-01-09
    • US249810
    • 1994-05-26
    • Hugh E. Hall, Jr.Dan M. Arnold
    • Hugh E. Hall, Jr.Dan M. Arnold
    • G01V5/10G01T5/10
    • G01V5/107
    • The present invention is directed toward the determination of moisture content per unit volume of material penetrated by a gas filled borehole. An alternate application of the invention is the detection of fractures and vugular cavities in the immediate vicinity of a liquid filled borehole. The apparatus comprises a probe which is conveyed along the borehole. The probe contains a source of neutrons and an epithermal neutron detector at essentially zero longitudinal spacing from the neutron source along the axis of the borehole. In the preferred embodiment, the neutron source is Californium-252 and the epithermal neutron detector comprises a glass scintillator. The response of the system is independent of the thermal neutron absorption properties of the material and the fluid within the borehole.
    • 本发明旨在确定由充满气体的钻孔渗透的每单位体积的水分含量。 本发明的替代应用是在液体填充的钻孔附近检测骨折和节段腔。 该装置包括沿钻孔传送的探针。 探头包含一个中子源和一个超中子探测器,与中子源沿钻孔轴线基本上零距离。 在优选实施例中,中子源为氪-225,超热中子检测器包括玻璃闪烁体。 该系统的响应与钻孔内材料和流体的热中子吸收性能无关。
    • 5. 发明授权
    • Method for correcting for isotope burn-in effects in fission neutron
dosimeters
    • 用于校正裂变中子剂量计中同位素燃烧效应的方法
    • US4744939A
    • 1988-05-17
    • US897555
    • 1986-08-18
    • Raymond GoldWilliam N. McElroy
    • Raymond GoldWilliam N. McElroy
    • G01T3/00G01T5/10G21G1/08G01T5/00
    • G01T3/00G01T5/10
    • A method is described for correcting for effect of isotope burn-in in fission neutron dosimeters. Two quantities are measured in order to quantify the "burn-in" contribution, namely P.sub.Z',A', the amount of (Z', A') isotope that is burned-in, and F.sub.Z', A', the fissions per unit volume produced in the (Z', A') isotope. To measure P.sub.Z', A', two solid state track recorder fission deposits are prepared from the very same material that comprises the fission neutron dosimeter, and the mass and mass density are measured. One of these deposits is exposed along with the fission neutron dosimeter, whereas the second deposit is subsequently used for observation of background. P.sub.Z', A' is then determined by conducting a second irradiation, wherein both the irradiated and unirradiated fission deposits are used in solid state track recorder dosimeters for observation of the absolute number of fissions per unit volume. The difference between the latter determines P.sub.Z', A' since the thermal neutron cross section is known. F.sub.Z', A' is obtained by using a fission neutron dosimeter for this specific isotope, which is exposed along with the original threshold fission neutron dosimeter to experience the same neutron flux-time history at the same location. In order to determine the fissions per unit volume produced in the isotope (Z', A') as it ingrows during the irradiation, B.sub.Z', A', from these observations, the neutron field must generally be either time independent or a separable function of time t and neutron energy E.
    • 6. 发明授权
    • Track recording plastic compositions
    • 跟踪记录塑料成分
    • US4394307A
    • 1983-07-19
    • US235691
    • 1981-02-18
    • Gregory Tarle
    • Gregory Tarle
    • G01T5/10G03F7/039C08K5/11
    • G01T5/10G03F7/039
    • Improved nuclear track recording plastic compositions are provided which exhibit greatly decreased surface roughness when etched to produce visible tracks of energetic nuclear particles which have passed into and/or through said plastic. The improved compositions incorporate a small quantity of a phthalic acid ester into the major plastic component which is derived from the polymerization of monomeric di-ethylene glycol bis allyl carbonate. Di-substituted phthalic acid esters are preferred as the added component, with the further perference that the ester substituent has a chain length of 2 or more carbon atoms. The inclusion of the phthalic acid ester to an extent of from about 1-2% by weight of the plastic compositions is sufficient to drastically reduce the surface roughness ordinarily produced when the track recording plastic is contacted by etchants.
    • 提供了改进的核轨道记录塑料组合物,其在蚀刻时显示出大大降低的表面粗糙度,以产生已经进入和/或通过所述塑料的能量核粒子的可见光轨。 改进的组合物将少量的邻苯二甲酸酯引入主要的塑料组分,其衍生自单体二乙二醇双烯丙基碳酸酯的聚合。 作为添加成分,优选二取代邻苯二甲酸酯,进一步认为酯取代基具有2个以上碳原子的链长。 将邻苯二甲酸酯包含在塑料组合物的约1-2重量%的范围内足以显着降低轨道记录塑料与蚀刻剂接触时通常产生的表面粗糙度。
    • 8. 发明授权
    • Recording of fast neutron images
    • 快速中子图像的记录
    • US3787698A
    • 1974-01-22
    • US3787698D
    • 1972-10-11
    • US ARMY
    • ANTAL JBECKER R
    • G01N23/09G01T3/00G01T5/10G03C5/16G03B41/16
    • G01T5/10G01N23/09G01T3/00G03C5/16
    • The formation of a permanent image of a fast neutron beam on cellulose nitrate film. The cellulose nitrate film is positioned between a converter film made of a suitable hydrogen-containing material, such as polyethylene, and the assembly attached to a back plate of aluminum. The neutron exposure is made with the neutrons impinging on the uncovered polyethylene face. Elastic scattering of fast neutrons by the nuclei of the hydrogen atoms in the polyethylene film produces protons which travel into the cellulose nitrate, leaving sensitized spikes therein. The cellulose nitrate film is etched by suspending in a sodium hydroxide solution and the image on the dry film viewed by transmitted light with the light source off the viewing axis.
    • 在硝酸纤维素膜上形成快速中子束的永久性图像。 硝酸纤维素膜位于由合适的含氢材料(例如聚乙烯)制成的转换膜和附着在铝背板上的组件之间。 中子暴露是用撞击在未覆盖的聚乙烯表面上的中子进行的。 聚乙烯薄膜中氢原子核的快中子的弹性散射产生了进入硝酸纤维素的质子,在其中留下敏化的尖峰。 通过悬浮在氢氧化钠溶液中蚀刻硝酸纤维素膜,并且通过透射光观察干膜上的图像,其中光源离观察轴。