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    Spectrophotometer
    71.
    发明公开
    Spectrophotometer 失效
    分光光度计

    公开(公告)号：EP0115902A3

    公开(公告)日：1985-06-26

    申请号：EP84300008

    申请日：1984-01-03

    Applicant: MILTON ROY CO.

    Inventor： Casey, William T.

    IPC: G01N21/85 ,  G01N21/27

    CPC classification number: F21V19/04 ,  G01J1/1626 ,  G01J2001/161 ,  G01N21/0317 ,  G01N21/05 ,  G01N21/255 ,  G01N21/85

    Abstract: A spectrophotometer is provided with a deuterium lamp (20) which emits a beam (32) comprising radiation of a plurality of frequencies. The beam (32) passes through a filter (34) for selecting the wavelength of the light desired to be incident onto a sample and then onto a beam splitting plate (26) which diverts a relatively small fraction of the beam (28) to a first reference photocell (30). The remaining portion of the beam (32) is incident directly on a sample tube (54). The sample tube (54) may be so designed that its transparent walls form a lens focussing the beam (32) on the sample to be tested. The beam (32) then passes through the further wall of the sample tube (54) and is detected by a second testing photocell (42), the output of which may be compared to the output of the reference photocell (30) to provide a signal indicative of the relative amplitude of the testing beam. The reference photocell (30) may be used to insure that the intensity of the beam (32) incident on the beam splitter (26) remains constant over time so that values output by the testing photocell (42) may be comparable to measurements taken at a later time, without the use of a reference sample for calibration purposes. The sample cell (54) is constructed so as to allow the use of the instrument in on-line applications in high pressure systems.

    IMPROVED GAS SAMPLE CHAMBER
    74.
    发明公开
    IMPROVED GAS SAMPLE CHAMBER 失效
    VERBESSERTE GASPROBENKAMMER。

    公开(公告)号：EP0568549A1

    公开(公告)日：1993-11-10

    申请号：EP92901709.0

    申请日：1991-11-25

    Applicant: GAZTECH INTERNATIONAL CORPORATION

    Inventor： WONG, Jacob, Y.

    IPC: G01N21 ,  G01N1 ,  G08B17 ,  G08B29 ,  G01J1

    CPC classification number: G01N21/0303 ,  G01J2001/161 ,  G01J2001/182 ,  G01N1/2258 ,  G01N21/0332 ,  G01N21/05 ,  G01N21/255 ,  G01N21/314 ,  G01N21/3504 ,  G01N2001/2261 ,  G01N2021/0321 ,  G01N2021/0385 ,  G01N2021/052 ,  G01N2201/0228 ,  G01N2201/06186 ,  G01N2201/0696 ,  G08B17/117 ,  G08B29/20

    Abstract: On décrit une chambre d'échantillonnage (10) de gaz conçue pour être utilisée dans un analyseur de gaz et qui se compose d'un tube creux allongé (21) pourvu d'une surface interne à réflexion spéculaire (22) ce qui permet au tube de fonctionner comme un guide de la lumière afin de transmettre par conduction un rayonnement à partir d'une source (20) vers un détecteur (16) en traversant le gaz de l'échantillon. Un nombre d'ouvertures (24) dans la paroi du tube creux allongé permet au gaz de l'échantillon d'entrer et sortir. Des particules de fumée et de poussière de taille supérieure à 0,1 micron sont maintenues à l'extérieur de la chambre à l'aide d'une membrane semi-perméable (28) qui couvre les ouvertures du tube creux. On évite la condensation des constituants du gaz de l'échantillon en chauffant la chambre d'échantillonnage électriquement à une température supérieure au point de rosée du constituant en question.

    Abstract translation: 用于测量辐射在其通过腔室内的气体时的吸收的样品室包括具有延伸的蛇形通道的块体。 延伸通道的壁涂覆有高反射材料，使得延伸通道用作用于传输辐射的光管。 许多较小的通道允许在样品室周围的空间中的气体扩散到辐射通过的延伸通道中。 采样室通过连接两个半部制成，每个半部具有制造细长凹槽的平面。 一半由塑料模制而成，而且室内价格相当便宜。

    A dual beam multichannel spectrophotometer with a unique logarithmic data converter
    76.
    发明公开
    A dual beam multichannel spectrophotometer with a unique logarithmic data converter 失效
    具有唯一对数数据转换器的双光束多通道光谱仪

    公开(公告)号：EP0329061A3

    公开(公告)日：1991-11-13

    申请号：EP89102478.8

    申请日：1989-02-14

    Applicant: APPLIED BIOSYSTEMS, INC.

    Inventor： Sapp, Edwin R. ,  Kinast, Eric K.

    IPC: G01N21/27 ,  G01J1/16 ,  G01J3/42

    CPC classification number: G01N21/27 ,  G01J3/2803 ,  G01J3/42 ,  G01J2001/161 ,  G01J2001/1673 ,  G01N30/74 ,  G01N2201/1232 ,  G01N2201/126

    Abstract: The present invention relates to an improved dual beam multichannel spectrophotomer employing a simple and novel optical system in combination with photodiode arrays and a unique logrithmic data converter to convert light signals to absorbance. In particular, the optical system utilizes optical elements in a novel arrangement to direct a pair of equivalent sample and reference beams in an essentially parallel formation respectively through a sample and reference cell and to focus and direct the emergent sample and reference beams to a single flat horizontally ruled grating which disperses each of the sample and reference beams respectively onto a pair of vertically disposed photodiode arrays whereby the light signals are converted into absorbance units (AU) by an unique logarithmic data converter. The spectrophotometer is highly accurate, has very low drift, less than 2 x 10⁻⁴ AU/°C, and very low noise, less than ±2 x 10⁻⁵AU. The dual beam multichannel spectrophotomer is particularly suitable for use in high pressure liquid chromatography to record the absorbance spectrum of the samples as they are being eluted from the chromatographic column.

    Two-wavelength type respiratory gas concentration measuring apparatus
    77.
    发明公开
    Two-wavelength type respiratory gas concentration measuring apparatus 失效
    双波长类型呼吸气浓度测量装置

    公开(公告)号：EP0385256A3

    公开(公告)日：1991-10-16

    申请号：EP90103363.9

    申请日：1990-02-21

    Applicant: Nihon Kohden Corporation

    Inventor： Kurahashi, Muneshige ,  Kato, Naoki

    IPC: G01N21/31 ,  A61B5/00

    CPC classification number: G01N21/314 ,  A61B5/0836 ,  G01J2001/161 ,  G01J2001/1684 ,  G01J2001/1689 ,  G01J2001/444 ,  G01N21/3504 ,  G01N2021/317

    Abstract: A two-wavelength type respiratory gas concentration measuring device includes a connector tube (22) which is held in the mouth of an examinee (1) and which has airtight windows (23), a light source (24) which applies infrared rays through the windows (23) of the connector tube (22), and first and second filters (27, 28). The first filter (27) allows the transmission of a light component whose wavelength is such that it is absorbed by the respiratory gas, and the second filter (28) allows the transmission of a light component whose wavelength is such that it is not absorbed by the respiratory gas. A photodetector (30) converts the infrared rays transmitted through the filters (27, 28) into an electric signal. A first detector (31) receives the electric signal and detects the light output of the first filter (27). A second detector (32) receives the electric signal and detects the light output of the second filter (28). A power computing circuit (33) performs a power computation of the output of the second detector (32) with a power exponent m . A divider circuit (34) divides the output of the first detector (31) by the output of the first power computing circuit (33). A DC level detector (36) detects the DC level of the photodetector (30) when no infrared rays are applied. A second power computing circuit (37) performs a power computation of the output of the DC-level detector (36) with a power exponent of 2(m-­1). A multiplier circuit (38) multiplies the output of the second power computing circuit (37) by the output of the divider (34).

    Method and apparatus for dual-beam spectral transmission measurements
    79.
    发明公开
    Method and apparatus for dual-beam spectral transmission measurements 失效
    Verfahren und VorrichtungfürspektraleZweistrahldurchlässigkeitsmessungen。

    公开(公告)号：EP0176826A2

    公开(公告)日：1986-04-09

    申请号：EP85111475.1

    申请日：1985-09-11

    Applicant: KOLLMORGEN TECHNOLOGIES CORPORATION

    Inventor： Kravetz, Alan G. ,  Kishner, Stanley J.

    IPC: G01J3/42

    CPC classification number: G01N21/5907 ,  G01J1/36 ,  G01J2001/161 ,  G01N2021/5992

    Abstract: In the measurement of the optical transmittance of a sample, a beam which is split from a source of illumination is . directed through the sample and then redirected back through the sample. The redirected beam and a reference beam which is also split from the source of illumination are alternately applied to a photodetector. Both the sample beam and the reference beam pass through a monochromator prior to application to the photodetector. The output of the photodetector is processed by an electronic circuit and applied to a computer. Data representative of the two beams can be compared in order to provide an indication of the amount of light the sample transmits at certain optical wavelengths.

    Abstract translation: 在测量样品的光透射率时，从照明源分离的光束被引导通过样品，然后被重新定向回通过样品。 重新定向的光束和也从光源分割的参考光束被交替地施加到光电检测器。 在施加到光电检测器之前，采样光束和参考光束都通过单色仪。 光电检测器的输出由电子电路处理并应用于计算机。 可以比较表示两个光束的数据，以便提供样品在某些光波长处透射的光量的指示。

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