公开(公告)号：US4755678A

公开(公告)日：1988-07-05

申请号：US78030

申请日：1987-07-28

申请人： Jerald R. Izatt ,  Russell Boulay ,  Richard Gagnon ,  Bernard Drouin

发明人： Jerald R. Izatt ,  Russell Boulay ,  Richard Gagnon ,  Bernard Drouin

IPC分类号： G01N21/31 ,  G01N21/35 ,  G01N21/86 ,  G01N21/39

CPC分类号： G01G9/005 ,  G01G17/02 ,  G01N21/3559 ,  G01N21/3581 ,  G01N2021/3155 ,  G01N2021/3166 ,  G01N2021/8663

摘要： A system for detecting simultaneously the moisture content and basis weight of paper is disclosed utilizing a submillimeter laser source of radiation of two different wavelengths which is subsequently scanned across the face of the paper. A plurality of detectors placed on the side of the paper opposite the laser supplies the transmittance information for each of the wavelengths to a microcomputer which in turn calculates the moisture content and the basis weight of the material. The two different wavelengths of submillimeter radiation are produced by either a pair of submillimeter lasers pumped by a continuous wave CO.sub.2 laser or by a single submillimeter laser pumped by a waveguide type continuous wave CO.sub.2 laser whose output is controlled by a piezoelectric crystal tuned resonator in order to provide the required two separate wavelengths alternating in time which are output in the single beam of the submillimeter laser.

摘要翻译： 公开了一种用于同时检测纸张的水分含量和基重的系统，其利用随后在纸面上扫描的两种不同波长的亚毫米波辐射源。 放置在与激光相反的一侧的多个检测器将每个波长的透射率信息提供给微型计算机，微计算机依次计算材料的水分含量和基重。 亚毫米辐射的两种不同波长是由连续波CO2激光器泵浦的一对亚毫米级激光器或由波导型连续波CO2激光器泵浦的单个亚毫米激光器产生的，该激光器的输出由压电晶体调谐谐振器按顺序控制 以提供在亚毫米波激光器的单个波束中输出的时间上所需的两个分离的波长。

公开(公告)号：US4785185A

公开(公告)日：1988-11-15

申请号：US924273

申请日：1986-10-29

申请人： Jerald R. Izatt ,  Russell Boulay

发明人： Jerald R. Izatt ,  Russell Boulay

IPC分类号： G01N21/35 ,  G01F23/00

CPC分类号： G01N21/3581 ,  G01N21/3559

摘要： A method and apparatus for detecting the moisture or filler content of dielectric material is disclosed which utilizes a submillimeter laser source of radiation scanned across the face of the material. A plurality of detectors, placed on the side of the material opposite the laser, supplies the material transmittance information to a microcomputer for calculating the moisture or filler content of the material. When thin dielectric materials and/or continuous scanning are utilized the submillimeter laser is pumped by a single CW (continuous wave) CO.sub.2 laser and when thicker dielectrics are measured with discrete pulses the submillimeter laser is pumped by a single TEA (Transversely Excited Atmospheric) CO.sub.2 laser. Depending on the transmission properties of the environment in which the apparatus operates, either the submillimeter laser beam or the infrared pump laser beam can be transmitted through the medium surrounding the apparatus in order to minimize pre-measurement attenuation of the beam.

摘要翻译： 公开了一种用于检测电介质材料的水分或填料含量的方法和装置，该方法和装置利用在材料表面上扫描的辐射的亚毫米激光源。 放置在与激光相反的材料一侧的多个检测器将材料透射率信息提供给用于计算材料的水分或填料含量的微型计算机。 当使用薄介电材料和/或连续扫描时，亚毫米波激光器通过单个CW（连续波）CO 2激光器泵浦，并且当用离散脉冲测量较厚的电介质时，亚毫米波激光器通过单个TEA（横向激发大气）CO 2 激光。 根据设备工作环境的传输特性，亚毫米波激光束或红外激光束激光束可通过设备周围的介质进行传输，以使波束的预测量衰减最小化。

公开(公告)号：US4654529A

公开(公告)日：1987-03-31

申请号：US823459

申请日：1986-01-28

申请人： Russell Boulay ,  Bernard Drouin ,  Richard Gagnon

发明人： Russell Boulay ,  Bernard Drouin ,  Richard Gagnon

IPC分类号： G01N21/23 ,  G01N21/86 ,  G01N21/21

CPC分类号： G01N21/23 ,  G01N2021/869

摘要： A method and a device for measuring the fibre orientation anisotropy in a fibrous structure such as a sheet of paper or a textile. According to this method, a linearly polarized, far infrared laser beam is directed towards one side of the fibrous structure whose fibre orientation anisotropy is to be measured. The incident energy of the laser beam is measured before this beam traverses the fibrous structure, and its transmitted energy is measured on the other side of the fibrous structure. The transmission coefficient T of the laser beam is determined in at least two different orientations of the polarization plane of the beam with respect to the fibrous structure, this coefficient T being the ratio of the transmitted-to-incident energies. This coefficient T varies exponentially with the basis weight of the fibrous structure and the ratio .alpha. of the absorption coefficients that can be derived from two measurements of coefficient T in two different orientations of the polarized beam, gives a quantitative evaluation of the amount of fibre orientation anisotropy, the value of this ratio .alpha. be equal to 1 when no anisotropy is present in the fibrous structure.

摘要翻译： 用于测量诸如纸或织物之类的纤维结构中的纤维取向各向异性的方法和装置。 根据该方法，将线性偏振的远红外激光束朝向要测量纤维取向各向异性的纤维结构的一侧。 在该光束穿过纤维结构之前测量激光束的入射能量，并且在纤维结构的另一侧测量其透射能量。 激光束的透射系数T以相对于纤维结构的光束的偏振面的至少两个不同取向来确定，该系数T是发射到入射能量的比率。 该系数T随着纤维结构的基重而变化，并且可以从偏振光束的两个不同取向的两个测量系数T得出的吸收系数的比α，给出纤维取向量的定量评估 各向异性，当纤维结构中不存在各向异性时，该比α的值等于1。