公开(公告)号：US06441900B1

公开(公告)日：2002-08-27

申请号：US09537010

申请日：2000-03-28

Applicant: Kenichi Fujiyoshi

Inventor： Kenichi Fujiyoshi

IPC: G01J302

CPC classification number: G01J3/28 ,  G01J2003/2866

Abstract: Light having a predetermined wavelength band as issued from a light-emitting diode is launched into a gas absorption cell which is filled with a gas having a plurality of absorption spectra. The light launched into the cell has a plurality of wavelengths absorbed by the gas. The absorption wavelengths are known and their values are preset in a memory in an optical spectrum analyzing section 58. The light passing through the cell is launched into the optical spectrum analyzing section 58, where it receives arithmetic operations to produce an optical spectrum. The optical spectrum analyzing section 58 has a CPU which compares a plurality of wavelengths having dominant absorption in the obtained optical spectrum with the preset reference wavelengths to compute the errors in wavelength measurement. The calibration value is determined on the basis of the average of these errors and the optical spectrum analyzer is accordingly calibrated in wavelength.

Abstract translation: 将从发光二极管发出的具有预定波长带的光发射到填充有具有多个吸收光谱的气体的气体吸收单元中。 发射到电池中的光具有被气体吸收的多个波长。 吸收波长是已知的，并且它们的值被预设在光谱分析部分58的存储器中。通过单元的光被发射到光谱分析部分58中，在那里它接收算术运算以产生光谱。 光谱分析部分58具有CPU，其将获得的光谱中具有主要吸收的多个波长与预设的参考波长进行比较，以计算波长测量中的误差。 基于这些误差的平均值确定校准值，并且相应地以波长校准光谱分析仪。

公开(公告)号：US06452674B1

公开(公告)日：2002-09-17

申请号：US09175290

申请日：1998-10-20

Applicant: Kenichi Fujiyoshi

Inventor： Kenichi Fujiyoshi

IPC: G01J318

CPC classification number: G01J3/06 ,  G01J3/1804 ,  G01J2003/2866

Abstract: A wavelength correction apparatus automatically corrects a deviation of a testing wavelength from a reference spectrum analyzer installed on-site. The apparatus is constructed of a reference light source 62 for outputting a reference light of a specific wavelength; a light input terminal 50 for inputting a testing light whose wavelength is to be measured and compensated; an optical switch 54 for receiving the testing light and the reference light so as to output one either the testing light or the reference light; a control section 60 for controlling the operations of the reference light source 62 and the optical switch 54; and an optical spectrum measuring device 58 for measuring optical spectra output from the optical switch 54 and for operating the control section 60 at a point in time specified by an operator. The in-situ wavelength correction device produce precise compensates for wavelength deviation so that a compact wave correction apparatus can be used on-site of optical communications stations.

Abstract translation: 波长校正装置自动校正测试波长与现场安装的参考频谱分析仪的偏差。 该装置由用于输出特定波长的参考光的参考光源62构成; 用于输入要测量和补偿波长的测试光的光输入端子50; 用于接收测试光和参考光以便输出测试光或参考光的光学开关54; 用于控制参考光源62和光开关54的操作的控制部分60; 以及用于测量从光开关54输出的光谱并用于在由操作者指定的时间点操作控制部分60的光谱测量装置58。 原位波长校正装置对波长偏差进行精确补偿，从而可以在光通信站的现场使用紧凑型波形校正装置。

公开(公告)号：US5748310A

公开(公告)日：1998-05-05

申请号：US791512

申请日：1997-01-30

Applicant: Kenichi Fujiyoshi

Inventor： Kenichi Fujiyoshi

IPC: G01J3/04 ,  G01J3/12 ,  G01J3/18 ,  G02B5/00 ,  G01J3/06

CPC classification number: G01J3/04 ,  G01J3/12 ,  G01J3/18

Abstract: A high-precision spectrum separation apparatus enables to generate an output beam having a specific wavelength from a multi-wavelength input beam. The input beam is focused on a diffraction grating through a focusing lens to generate a number of diffracted component beams, of which a diffracted component beam having a specific wavelength is directed to an output slit, resulting in an output beam having well-defined spectral properties. When the output beam is required to have a band of wavelengths, the fixed focal distance of the focusing lens is shorter than is required to generate well-defined output beam, resulting that the diffracted component beam cannot be focused precisely on the output slit. In such a case, a flat glass plate is introduced between the focusing lens and the output slit to adjust the focal-point of the focusing lens so that the diffracted component beams are focused precisely on the output slit. An output beam having well-defined spectral properties is thus produced from the apparatus.

Abstract translation: 高精度频谱分离装置能够从多波长输入光束产生具有特定波长的输出光束。 输入光束通过聚焦透镜聚焦在衍射光栅上以产生多个衍射分量光束，其中具有特定波长的衍射分量光束被引导到输出狭缝，导致输出光束具有明确的光谱特性 。 当输出光束需要具有波长带时，聚焦透镜的固定焦距比生成明确定义的输出光束所需要的短，导致衍射分量光束不能精确地聚焦在输出狭缝上。 在这种情况下，在聚焦透镜和输出狭缝之间引入平板玻璃板，以调整聚焦透镜的焦点，使得衍射分量光束精确地聚焦在输出狭缝上。 因此，从设备产生具有明确定义的光谱特性的输出光束。