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    • 4. 发明授权
    • Vapor detection with high speed gas chromatography
    • 用高速气相色谱法进行气相检测
    • US5108705A
    • 1992-04-28
    • US594267
    • 1990-10-03
    • David P. RounbehlerDavid P. LiebEugene K. AchterDavid B. GernesAbdul Tafreshi
    • David P. RounbehlerDavid P. LiebEugene K. AchterDavid B. GernesAbdul Tafreshi
    • G01N1/22G01N21/76G01N30/46G01N30/62G01N30/74G01N30/84
    • G01N30/62G01N30/84G01N2030/623G01N2030/8405G01N21/76G01N30/461G01N30/74
    • Disclosed are a method and apparatus for high speed, selective detection of vapors of specific compounds, particularly nitrogen-containing compounds, utilizing, a bypass branch and high speed gas chromatography for improved selectively and sensitivity of detection. A system with two gas chromatographs (GC's) alternating in series with two pyrolyzers provides two time intervals of detection in a downstream detector, with the second time interval containing signals delayed and further separated relative to signals from the first time interval. The bypass branch, in diverting a portion of the flow of gas samples from passage through the second gas chromatograph and second pyrolyzer, avoids interferences in the first time interval of detection from non-GC-retained compounds decomposed in the second pyrolyzer. Also disclosed is an arrangement for rapid, precise heating of vapor concentrator tubes in which vapors are rapidly focussed and then injected into a GC, and for rapid, precise heating of the GC's.
    • 公开了一种用于高速,选择性地检测特定化合物,特别是含氮化合物的蒸气的方法和装置,利用旁路分支和高速气相色谱法提高选择性和灵敏度。 具有与两个热解器串联交替的两个气相色谱仪(GC)的系统在下游检测器中提供两个检测时间间隔,其中第二时间间隔包含相对于来自第一时间间隔的信号延迟和进一步分离的信号。 旁路分支在将一部分气体样品从通过第二气相色谱仪和第二热解器的过程中转移时,避免了在第二次热解器中分解的非GC保留化合物的第一时间间隔内的干扰。 还公开了一种用于快速精确加热蒸汽浓缩管的装置,其中蒸气快速聚焦,然后注入GC,并快速,精确地加热GC。
    • 9. 发明授权
    • Method and system for sampling and determining the presence of compounds
    • 用于取样和确定化合物存在的方法和系统
    • US5470754A
    • 1995-11-28
    • US20804
    • 1993-02-22
    • David P. RounbehlerDavid H. FineEugene K. AchterStephen J. MacDonaldDaniel B. Dennison
    • David P. RounbehlerDavid H. FineEugene K. AchterStephen J. MacDonaldDaniel B. Dennison
    • B07C5/34B08B9/46B29B17/00B29B17/02G01N1/00G01N1/22G01N1/24G01N21/64G01N21/76G01N21/90G01N33/00G01N33/44
    • B07C5/34B07C5/3408B08B9/46B29B17/00B29B17/02G01N1/2226G01N21/64G01N21/766G01N21/9018B08B2203/005B29B2017/0275G01N1/2202G01N1/24G01N2001/2223G01N2001/2229G01N2033/0081G01N21/76Y02W30/62Y02W30/622Y10T436/113332Y10T436/17Y10T436/206664Y10T436/21
    • A system and method are provided for minimizing the effects of background signals in masking signals indicating the presence of substances to be detected such as contaminants in materials moving rapidly along a conveyor. The contaminants detected may include nitrogen containing compounds and hydrocarbons. The system and method of the present invention minimize during detection of the presence or absence of such substances, the number of falsely positive indications of the presence of such substances due to background signals and changes in background signals. The substances detected are divided into first and second sample portions and the respective portions are heated. The first heated portion is mixed with ozone to cause a chemical reaction therewith in order to generate radiation by chemiluminescence having characteristic wavelengths related to substances in the first portion. The second portion heated is also mixed with ozone to cause a chemical reaction therewith in order to generate radiation by chemiluminescence having characteristic wavelengths related to substances in the second portion. The radiation of the respective first and second portions is selectively detected. The heating and detecting steps are performed in a manner so as to yield a higher level of detected radiation from one of the portions of the sample then the other for at least some of the selected compounds being detected. Electrical signals from the respective first and second portions are generated and compared in order to determine the presence or absence of selected compounds in the sample. Appropriate reject signals for a bottle sorting system are generated accordingly.
    • 提供了一种系统和方法,用于最小化背景信号在屏蔽指示待检测物质的存在的信号中的影响,例如沿着传送器快速移动的材料中的污染物。 检测到的污染物可能包括含氮化合物和碳氢化合物。 本发明的系统和方法在检测到这种物质的存在或不存在期间最小化了由于背景信号和背景信号的变化而导致的这种物质的存在的错误的阳性迹象的数量。 所检测的物质被分成第一和第二样品部分,并且各个部分被加热。 将第一加热部分与臭氧混合以引起与其的化学反应,以通过具有与第一部分中的物质相关的特征波长的化学发光来产生辐射。 加热的第二部分也与臭氧混合以引起与其的化学反应,以通过具有与第二部分中的物质相关的特征波长的化学发光产生辐射。 选择性地检测相应的第一和第二部分的辐射。 加热和检测步骤以这样的方式进行,以便从样品的一个部分产生更高水平的检测到的辐射,然后对于检测到的至少一些所选化合物产生另一个。 产生并比较来自相应的第一和第二部分的电信号,以确定样品中选定化合物的存在或不存在。 相应地生成用于瓶分选系统的适当拒绝信号。