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    • 23. 发明授权
    • Optical waveguide vapor sensor
    • 光波导蒸汽传感器
    • US5315673A
    • 1994-05-24
    • US848240
    • 1992-03-09
    • Joseph R. StetterG. Jordan MaclayDavid S. Ballantine, Jr.
    • Joseph R. StetterG. Jordan MaclayDavid S. Ballantine, Jr.
    • G01N21/77G01N21/78G01N21/81G02B6/02
    • G01N21/7703G01N2021/773G01N21/783G01N21/81
    • An optical waveguide sensor for the detection of acid vapors comprises a chemically sensitive reagent coating of bromothymol blue or thymol blue indicator suspended in a Nafion polymer film. The sensor uses a 562-nm light-emitting diode source and a phototransistor detector. The response to HCl and H.sub.2 S vapors is both rapid and reversible, with an estimated detection limit for H.sub.2 S of less than 15 ppmv (parts per million by volume). The sensor exhibits generalized response to protonic acid vapors, but does not produce an indicator response to CO.sub.2, even at large concentrations (60 volume-%) in the presence of water vapor. The sensor exhibits a systematic interference from water vapor which may be corrected by a differential approach, either using a reference sensor (Nafion without an indicator) or by monitoring the sensor responses at two wavelengths.
    • 用于检测酸性蒸气的光波导传感器包括悬浮在Nafion聚合物膜中的溴百里酚蓝或百里酚蓝指示剂的化学敏感性试剂涂层。 该传感器使用562nm发光二极管源和光电晶体管检测器。 对HCl和H2S蒸气的反应是快速和可逆的,H2S的估计检测限低于15ppmv(按体积计百万分之一)。 该传感器对质子酸蒸气表现出广泛的反应,但在水蒸气存在下,即使在大的浓度(60体积%)下也不会产生对二氧化碳的指示剂反应。 该传感器表现出来自水蒸气的系统干扰,可以通过差分方法校正,无论是使用参考传感器(Nafion无指示器)还是通过监测两个波长的传感器响应。
    • 26. 发明授权
    • Optical-type, phase transition humidity-responsive devices
    • 光学型,相变湿度响应装置
    • US5022045A
    • 1991-06-04
    • US547314
    • 1990-07-05
    • Stanley B. Elliott
    • Stanley B. Elliott
    • G01N21/81
    • G01N21/81
    • The invention is directed to chemical compositions suitable for use in salt-solution transition temperature or hot mirror devices. It also provides methods of using these sensors (for the measurement of the humidity of gases) as well as the apparatus. The chemical composition which of itself senses the changes of water vapor pressure is birefringent at a first water vapor pressure and temperature, but non-birefringent at a second vapor pressure and temperature. The optical changes which accompany these phase changes may be amplified with polarizers. The means for heating the chemical composition can vary widely. Various thermometric devices can be used for temperature sensing. The accuracy required of the particular instrument model, the device's configuration, and the other components, selected for the particular system all affect the choice of thermometric device selected. The light detector is responsive to observable changes in the brightness and intensity of the light emerging from the chemical composition, the light from the composition at a particular water vapor pressure and temperature being of sufficient brightness and intensity to provide an optical signal to activate the light-detecting electrical means.
    • 本发明涉及适用于盐溶液转变温度或热反射镜装置的化学组合物。 它还提供了使用这些传感器(用于测量气体湿度)以及设备的方法。 本身感觉到水蒸汽压力变化的化学组成在第一水蒸气压和温度下是双折射的,但在第二蒸气压和温度下是双折射的。 伴随这些相变的光学变化可以用偏振器放大。 用于加热化学成分的方法可以变化很大。 各种测温装置可用于温度检测。 为特定系统选择的特定仪器型号,设备配置和其他组件所需的精度都会影响所选择的温度计设备的选择。 光检测器响应于从化学成分出现的光的亮度和强度的可观察的变化,来自组合物的光在特定水蒸汽压力和温度下具有足够的亮度和强度,以提供光信号来激活光 - 检测电气装置。
    • 27. 发明授权
    • Method for colorimetric analysis of water content
    • 含水量比色分析方法
    • US4786602A
    • 1988-11-22
    • US863602
    • 1986-05-15
    • Harald Dahms
    • Harald Dahms
    • G01N21/81G01N31/16G01N33/18
    • G01N31/168G01N21/81
    • A method for the colorimetric determination of water content of an unknown sample, using the Karl Fischer reaction. The Karl Fischer reagent in a container has added to it a dye whose optical absorption preferably does not overlap with the optical absorption of the Karl Fischer reagent. Measurement of the optical absorption of the reagent/dye mixture is then made at two wavelengths, one wavelength being strongly absorbed by iodine in the reagent while the other wavelength is strongly absorbed by the dye. After the unknown sample is added, optical absorption measurements are again made at the two wavelengths. The measurements made at the wavelength where the dye strongly absorbs are used to correct the optical absorption measurements made at the wavelength where iodine strongly absorbs. This corrects for all factors affecting optical density other than the amount of water in the unknown sample.
    • 使用卡尔费休反应比色测定未知样品的含水量的方法。 容器中的卡尔费休试剂已经加入了一种染料,其光吸收优选不与卡尔费休试剂的光吸收重叠。 然后在两个波长上测量试剂/染料混合物的光吸收,一个波长在试剂中被碘强烈吸收,而另一个波长被染料强烈吸收。 在添加未知样品后,再次在两个波长处进行光学吸收测量。 在染料强烈吸收的波长处进行的测量用于校正在碘强吸收的波长处进行的光吸收测量。 这纠正影响光密度的所有因素,而不是未知样品中的水量。