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10 条记录 (耗时 0.017 秒)

    Flame atomic absorption spectrophtometer including apparatus and method for logarithmic conversion
    5.
    发明授权
    Flame atomic absorption spectrophtometer including apparatus and method for logarithmic conversion 失效
    火焰原子吸收光谱仪包括对数转换的装置和方法

    公开(公告)号：US4726679A

    公开(公告)日：1988-02-23

    申请号：US835145

    申请日：1986-03-03

    申请人： John T. McCaffrey

    发明人： John T. McCaffrey

    IPC分类号： G01N21/31 ,  G01N21/72

    CPC分类号： G01N21/72 ,  G01N21/3103 ,  G01N2201/127

    摘要： The optical measurement signals in a flame atomic absorption spectrophotometer are first amplified in a substantially linear variable gain amplifier. The gain of the variable gain amplifier is adjusted to provide a predetermined magnitude of output signal during a calibration phase of the spectrophotometer. The resultant output signals from the variable gain amplifier are then converted to a logarithmic function in a logarithmic amplifier during optical absorption measurements.

    摘要翻译： 火焰原子吸收分光光度计中的光学测量信号首先在基本线性的可变增益放大器中放大。 调节可变增益放大器的增益以在分光光度计的校准阶段期间提供预定幅度的输出信号。 然后，在光吸收测量期间，来自可变增益放大器的结果输出信号在对数放大器中被转换成对数函数。

    Power circuit for spectral analysis gaseous discharge lamps
    6.
    发明授权
    Power circuit for spectral analysis gaseous discharge lamps 失效
    用于光谱分析气体放电灯的电源电路

    公开(公告)号：US4716342A

    公开(公告)日：1987-12-29

    申请号：US804948

    申请日：1985-12-05

    申请人： John T. McCaffrey

    发明人： John T. McCaffrey

    IPC分类号： H05B41/34 ,  H05B37/02 ,  H05B39/04 ,  H05B41/36

    CPC分类号： H05B41/34 ,  Y10S315/05 ,  Y10S315/07

    摘要： The circuit includes an inverter to be connected to a source of d.c. power. The inverter has a transformer with a center-tapped primary winding. Separate controllable switching devices are connected to the respective ends of the primary winding. Both switching devices are arranged to be connected in common to one output terminal of the d.c. power source. The center tap of the transformer primary winding is arranged for connection to the other output terminal of the d.c. power source. The transformer has a laminated silicon steel core, and includes a secondary winding arranged for connection across the input terminals of a gaseous discharge lamp. A control circuit is connected to control conduction by the separate controllable switching devices in alternating sequence at a desired frequency of operation.

    摘要翻译： 该电路包括连接到直流电源的逆变器。 功率。 变频器具有带中心抽头的初级绕组的变压器。 单独的可控开关装置连接到初级绕组的相应端。 两个开关装置被布置成共同连接到直流的一个输出端子。 能量源。 变压器初级绕组的中心抽头布置成连接到直流的另一个输出端。 能量源。 变压器具有层压硅钢芯，并且包括布置成连接在气体放电灯的输入端上的次级绕组。 控制电路被连接以通过分离的可控开关装置以期望的操作频率交替地控制导通。

    Methods and apparatus to improve the sensitivity and reproducibility of bioluminescent analytical methods
    7.
    发明授权
    Methods and apparatus to improve the sensitivity and reproducibility of bioluminescent analytical methods 有权
    提高生物发光分析方法的灵敏度和再现性的方法和装置

    公开(公告)号：US06927851B2

    公开(公告)日：2005-08-09

    申请号：US09821571

    申请日：2001-03-29

    申请人： John T. McCaffrey ,  Szilveszter Jando ,  Sunita Carrasko

    发明人： John T. McCaffrey ,  Szilveszter Jando ,  Sunita Carrasko

    IPC分类号： G01N21/76 ,  G01J3/30

    CPC分类号： G01N21/763 ,  G01N2201/0221

    摘要： A hand-held assay device measuring chemiluminescence generated by as ample of ATP or other entity capable of chemically reacting to generate photoluminescence includes a photodiode detecting light which is emitted from the sample to produce a sample signal, another photodiode generating a reference signal in response to environmental changes, switched integrators amplifying the sensor signal over a controllable integration time to detect an output signal indicative of the presence of the sample.

    摘要翻译： 测量由能够化学反应产生光致发光的ATP或其他实体产生的化学发光的手持测定装置包括光电二极管，其从样品发射以产生样品信号，另一光电二极管响应于 环境变化，开关积分器在可控积分时间上放大传感器信号，以检测指示样品存在的输出信号。

    Apparatus for chemiluminescent assays
    9.
    发明授权
    Apparatus for chemiluminescent assays 失效
    化学发光测定仪

    公开(公告)号：US07485262B2

    公开(公告)日：2009-02-03

    申请号：US10326332

    申请日：2002-12-19

    申请人： Joseph L. DiCesare ,  John T. McCaffrey ,  David Clark ,  Michael I. Crockett

    发明人： Joseph L. DiCesare ,  John T. McCaffrey ,  David Clark ,  Michael I. Crockett

    IPC分类号： G01N33/48

    CPC分类号： G01N33/52 ,  B01L3/5029 ,  B01L2300/0672 ,  B01L2300/0832 ,  B01L2300/087 ,  B01L2400/0478 ,  B01L2400/0683 ,  C12Q1/66 ,  G01N1/02 ,  G01N21/76 ,  G01N2001/028 ,  G01N2201/0221 ,  Y10T436/16 ,  Y10T436/25375 ,  Y10T436/2575

    摘要： Disclosed herein is a device and methods for the rapid chemiluminescence assay of surfaces to detect the presence of microbial contamination. The device and methods are suitable for use by untrained personnel under the relatively harsh and variable conditions found in the field, for example in fast food restaurants and other food preparation areas. The chemiluminescence reaction that is the source of the analytical signal in the disclosed assay device and method is preferably based on a luciferase/luciferin system. The method for sampling disclosed herein comprises the steps of pre-wetting the sampling swab to a level below that of absorptive saturation; wiping a surface to be sampled with the swab with sufficient pressure to expel the wetting solution onto the surface; and, after reducing the pressure exerted on the sampling swab, further wiping the surface to re-absorb the moisture from the surface.

    摘要翻译： 本文公开了用于快速化学发光测定表面以检测微生物污染物的存在的装置和方法。 该装置和方法适合于在现场发现的相对苛刻和可变条件下的未经训练的人员使用，例如在快餐店和其他食物制备区域。 作为所公开的测定装置和方法中的分析信号的来源的化学发光反应优选基于荧光素酶/荧光素系统。 本文公开的采样方法包括以下步骤：将采样拭子预润湿至低于吸收饱和度的水平; 用足够的压力用拭子擦拭待采样的表面以将润湿溶液排出到表面上; 并且在降低施加在取样拭子上的压力之后，进一步擦拭表面以从表面再吸收水分。

    Atomic absorption spectrophotometer with improved drain trap interlock
    10.
    发明授权
    Atomic absorption spectrophotometer with improved drain trap interlock 失效
    原子吸收分光光度计具有改进的排水阱互锁

    公开(公告)号：US4647201A

    公开(公告)日：1987-03-03

    申请号：US818453

    申请日：1986-01-13

    申请人： John T. McCaffrey

    发明人： John T. McCaffrey

    IPC分类号： G01N21/72

    CPC分类号： G01N21/72

    摘要： The interlock assures that the end of a drain trap entrance pipe is covered with liquid. The system includes a control circuit with a circuit element which changes impedance with temperature changes. The circuit element is arranged to be thermally coupled with the drain trap liquid when the discharge end of the drain trap entrance pipe is immersed in the liquid. The circuit applies a current to the circuit element to thereby apply energy thereto. The circuit element achieves a lower steady-state temperature when thermally coupled with the liquid. The control circuit is operable to detect the difference in resistance when the circuit element is at the lower temperature. The control circuit is connected to a valve device for controlling combustion gas for the spectrophotometer and is operable to enable the valve device to enable the spectrophotometer when the circuit element is at the lower temperature and to disable the spectrophotometer at a higher temperature.

    摘要翻译： 联锁装置确保排水盘入口管的末端被液体覆盖。 该系统包括具有随着温度变化而改变阻抗的电路元件的控制电路。 电路元件布置成当排水陷阱入口管的排放端浸入液体中时与排水阱液体热耦合。 电路向电路元件施加电流，从而向其施加能量。 当与液体热耦合时，电路元件达到较低的稳态温度。 当电路元件处于较低温度时，控制电路可操作以检测电阻差。 控制电路连接到用于控制用于分光光度计的燃烧气体的阀装置，并且可操作以使阀装置能够在电路元件处于较低温度时启用分光光度计，并在较高温度下禁用分光光度计。