Gas detection method and gas detector
    194.
    发明专利
    Gas detection method and gas detector 有权
    气体检测方法和气体检测器

    公开(公告)号:JP2007040995A

    公开(公告)日:2007-02-15

    申请号:JP2006207393

    申请日:2006-07-31

    CPC classification number: G01N21/39 G01J3/433 G01N21/3504 G01N2201/0691

    Abstract: PROBLEM TO BE SOLVED: To provide a gas detection method and a gas detector with a low degree of dependence on temperature and on a sudden change in a wavelength. SOLUTION: This gas detector comprises at least one surface emission laser light source 1 and at least one light sensor 8 for detecting a light beam passing through a specimen chamber 4 containing a gas to be measured. A detection signal by the light sensor 8 is inputted into lock-in amplifiers 19 and 20 directly or after being differentiated in terms of time in a differential computing unit 25, and outputted therefrom as two different 2f detection signals, that is, measurement signals S MI and S MA . Here, f is the wavelength-modulated frequency of a light source. A ratio between the two measurement signals gives accurate gas concentration. In gas detection, at least first and second modulation reference signals S 2f0 and S 2f1 are used of a frequency 2f of twice the modulated frequency f of the laser light source. This gas detector excels conventional techniques since the use of the 2f modulation reference signals provides a result independent of absolute strength measurement, that is, independent of laser temperature change or mode hopping. Further, a merit is also provided that measurement accuracy is independent of gas concentration. COPYRIGHT: (C)2007,JPO&INPIT

    Abstract translation: 要解决的问题:提供对温度低依赖性和波长突然变化的气体检测方法和气体检测器。 解决方案:该气体检测器包括至少一个表面发射激光光源1和至少一个光传感器8,用于检测通过包含待测气体的试样室4的光束。 光传感器8的检测信号直接输入到锁定放大器19和20,或者在微分计算单元25中在时间上被区分后输出,作为两个不同的2f检测信号,即测量信号S MI 和S MA 。 这里,f是光源的波长调制频率。 两个测量信号之间的比率提供了精确的气体浓度。 在气体检测中,使用激光光源的调制频率f的两倍的频率2f的至少第一和第二调制参考信号S SB2f0和S 。 该气体检测器优于常规技术,因为使用2f调制参考信号提供独立于绝对强度测量的结果,即独立于激光器温度变化或模式跳变。 此外,还提供了测量精度与气体浓度无关的优点。 版权所有(C)2007,JPO&INPIT

    RAMAN SPECTROSCOPY SYSTEMS AND RAMAN SPECTROSCOPY METHODS
    197.
    发明申请
    RAMAN SPECTROSCOPY SYSTEMS AND RAMAN SPECTROSCOPY METHODS 审中-公开
    拉曼光谱系统和拉曼光谱法

    公开(公告)号:WO2016064339A1

    公开(公告)日:2016-04-28

    申请号:PCT/SG2014/000501

    申请日:2014-10-24

    Abstract: According to various embodiments, a Raman spectroscopy method is provided for reduction of background fluorescence signal. The method may utilize a high speed optical chopper configured to periodically interrupt the laser light beam between the laser light source and the sample; and using the high speed optical chopper to provide a synchronized time-gated optical window for receiving mostly Raman signal while rejecting most or some of the fluorescence signal transmitted from the sample in response to the laser light beam before reaching the sensor

    Abstract translation: 根据各种实施方案,提供拉曼光谱法以减少背景荧光信号。 该方法可以利用配置为周期性地中断激光光源和样品之间的激光束的高速光斩波器; 并且使用高速光斩波器来提供用于大部分拉曼信号的同步的时间门控窗口,同时在到达传感器之前响应于激光束排斥从样品传送的大部分或一些荧光信号

    VERFAHREN UND GASANALYSATOR ZUR MESSUNG DER KONZENTRATION EINER GASKOMPONENTE IN EINEM MESSGAS
    198.
    发明申请
    VERFAHREN UND GASANALYSATOR ZUR MESSUNG DER KONZENTRATION EINER GASKOMPONENTE IN EINEM MESSGAS 审中-公开
    方法和气体分析仪测量气体成分的浓度在气体测量

    公开(公告)号:WO2016050577A1

    公开(公告)日:2016-04-07

    申请号:PCT/EP2015/071841

    申请日:2015-09-23

    Abstract: Verfahren und Gasanalysator zur Messung der Konzentration einer Gaskomponente in einem Messgas Zur Messung der Konzentration einer Gaskomponente in einem Messgas (1), wird eine wellenlängenabstimmbare Laserdiode (3) mit einem Strom (i) angesteuert und das von der Laserdiode (3) erzeugte Licht (4) durch das Messgas (1) auf einen Detektor (5) geführt. Dabei wird der Strom (i) in periodisch aufeinanderfolgenden Abtastintervallen variiert, um eine interessierende Absorptionslinie der Gaskomponente wellenlängenabhängig abzutasten. Der Strom (i) kann zusätzlich im Sinne der Wellenlängenmodulationsspektroskopie mit geringer Frequenz und kleiner Amplitude sinusförmig moduliert werden. Ein von dem Detektor (5) erzeugtes Messsignal (14) wird zu einem Messergebnis (16) ausgewertet. Um das Messsignal-Rausch-Verhältnis zu verbessern und so bei gleicher Messstrecke eine deutlich niedrigere Nachweisgrenze zu erreichen, wird der Strom (i) mit mindestens einer hohen (HF-)Frequenz im GHz-Bereich moduliert, so dass keine Wellenlängenmodulation stattfindet. Die Amplitude der HF-Modulation wird unter Ausnutzung des linearen Aussteuerbereichs der Laserdiode (3) mit maximaler Höhe gewählt. Das Messsignal (14) wird vor seiner Auswertung an der Stelle der mindestens einen hohen Frequenz demoduliert.

    Abstract translation: 方法和气体分析仪用于测量气体成分的浓度的测量气体中,用于测量的测量气体中的气体成分的浓度(1)被驱动的波长可调谐激光二极管(3)的电流(i)和所产生的所述激光二极管(3)的光( 4)通过将样品气体(1)到检测器(5)进行。 在这种情况下,电流(i)在周期性地连续采样间隔是变化的扫描线的感兴趣的气体组分的波长依赖性的吸收。 电流(i)可被额外地在波长调制光谱的感与低频小振幅正弦调制。 一个检测器(5)的生成的测量信号(14),在测量结果(16)被评估。 为了提高测量信噪比,从而与至少一个高(HF)实现相同的测量路径的显著检测下限,则电流(i)被调制在GHz范围内的频率,以使没有波长调制发生。 射频调制的幅度是由具有最大高度取激光二极管(3)的线性动态范围的优点选择。 所述测量信号(14)是在至少一个高频的位置其评估之前解调。

    METHOD FOR DETERMINING ABSORPTION BANDS
    199.
    发明申请
    METHOD FOR DETERMINING ABSORPTION BANDS 审中-公开
    用于确定吸收剂的方法

    公开(公告)号:WO2016026735A1

    公开(公告)日:2016-02-25

    申请号:PCT/EP2015/068475

    申请日:2015-08-11

    Abstract: The present invention concerns a method for determining at least one absorption band in a spectrum, the method at least comprising the steps of: - providing a measured absorption spectrum from the sample, - providing a calculation spectrum, - from the calculation spectrum, extracting at least one absorption band, - calculating a residual spectrum by removing each extracted absorption band from the calculation spectrum, - testing whether a predefined stop criterion is fulfilled by the residual spectrum, - if the stop criterion is not fulfilled, using the residual spectrum as the calculation spectrum and iterating the extracting step, the forming step, the calculating step and the testing step, and - if the stop criterion is fulfilled, outputting each extracted absorption band.

    Abstract translation: 本发明涉及一种用于确定光谱中的至少一个吸收带的方法,该方法至少包括以下步骤: - 从样品提供测量的吸收光谱, - 提供计算光谱, - 从计算光谱中提取 至少一个吸收带, - 通过从计算光谱去除每个提取的吸收带来计算残留光谱, - 测试残留光谱中是否满足预定义的停止标准, - 如果不满足停止标准,则使用剩余光谱作为 计算频谱,迭代提取步骤,形成步骤,计算步骤和测试步骤,以及 - 如果满足停止标准,则输出每个提取的吸收带。

Patent Agency Ranking