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    • 5. 发明申请
    • Use of a Broad Band UV Light Source for Reducing The Mercury Interference in Ozone Measurements
    • 使用宽带UV光源降低臭氧测量中的汞干扰
    • US20090302230A1
    • 2009-12-10
    • US12480544
    • 2009-06-08
    • John W. BirksCraig J. WillifordPeter C. Andersen
    • John W. BirksCraig J. WillifordPeter C. Andersen
    • G01J1/42
    • G01J3/42G01J3/10G01N33/0024G01N33/0039Y02A50/247
    • The present disclosure provides a means of greatly reducing the interference of mercury vapor in the UV absorbance measurement of ozone. Currently, commercial ozone monitors make use of a low pressure Hg lamp as the radiation source. Because the lamp spectral lines are extremely narrow and resonant with the Hg vapor absorption spectrum, ozone monitors typically detect Hg with approximately three orders of magnitude greater sensitivity than ozone itself. The replacement of the low pressure mercury lamp with a broad band UV source centered near 254 nm greatly reduces the Hg interference. The optimal band width (FWHM) for the radiation source is approximately 1-10 nm. For band widths in this range, the Hg interference is reduced by a factor of 140 (for 1 nm) to 1,400 (for 10 nm) with minimal effect on the sensitivity toward ozone and linear dynamic range. Although conventional broad band sources such as medium and high pressure Hg lamps, hydrogen lamps, deuterium lamps and xenon arc lamps could be used in conjunction with a monochromator and/or band pass filter to produce radiation of the desirable band width, recently developed UV LEDs are used in the disclosed embodiments because of their small size and low power consumption.
    • 本公开提供了在臭氧的紫外吸收测量中大大降低汞蒸气的干扰的方法。 目前,商用臭氧监测仪采用低压汞灯作为辐射源。 由于灯光谱线非常窄并且与Hg蒸气吸收光谱共振,所以臭氧监测器通常会检测Hg的灵敏度比臭氧本身大约三个数量级。 以254nm左右为中心的宽带紫外光源替代低压汞灯大大降低了汞的干扰。 辐射源的最佳带宽(FWHM)约为1-10nm。 对于此范围内的带宽,Hg干扰降低到140(1 nm)至1,400(10 nm),对臭氧敏感度和线性动态范围影响最小。 尽管常规的宽带光源(例如中压和高压汞灯),氢灯,氘灯和氙弧灯可以与单色仪和/或带通滤波器结合使用以产生所需带宽的辐射,最近开发的UV LED 由于其小尺寸和低功耗,在所公开的实施例中使用。
    • 6. 发明授权
    • Fluid component detection method
    • 流体成分检测方法
    • US5134080A
    • 1992-07-28
    • US536165
    • 1990-06-11
    • William E. BellJohn J. McNerney
    • William E. BellJohn J. McNerney
    • C23G5/00G01N27/12G01N33/00
    • G01N33/0024C23G5/00G01N27/12G01N33/0029Y10T436/182Y10T436/184Y10T436/186Y10T436/188
    • A selected component of a fluid mixture, for example a reduced sulfur compound vapor in air, is detected by selectively adsorbing the component onto a conductive thin layer of material having a chemical affinity for such component and observing the resultant change of electrical resistivity of the layer. The sensitivity of the detector changes with accumulation of the component on the sensor. The accumulation of the component on the sensor is removed by oxidizing and evolving the component from the sensor to restore the sensor to a linear operating region. The accumulated component is preferably oxidized by reacting the component with ozone. The dynamic range of the sensor is increased by counteracting the tendency for the component to accumulate by continuously feeding back ozone to or controlling the temperature of the sensor so that the sensor operates in a linear region near null.
    • 流体混合物的选定组分,例如空气中还原的硫化合物蒸气,通过选择性地将组分吸附到对这种组分具有化学亲合力的材料的导电薄层上,并观察所得层的电阻率变化 。 检测器的灵敏度随着部件在传感器上的积累而变化。 通过从传感器氧化和演化组件来将组件的累积消除在传感器上,以将传感器恢复到线性操作区域。 优选地,通过使该组分与臭氧反应来使所累积的组分氧化。 传感器的动态范围通过连续反馈臭氧或控制传感器的温度来抵消部件累积的趋势而增加,使得传感器在接近零的线性区域中运行。