公开(公告)号：US4927269A

公开(公告)日：1990-05-22

申请号：US304697

申请日：1989-01-31

申请人： Axel Keens ,  Arno Simon

发明人： Axel Keens ,  Arno Simon

IPC分类号： G01J3/45

CPC分类号： G01J3/45

摘要： An interferogram is formed as in the prior art by dividing a beam of radiation from the source into two beams and interfering these beams so as to form an interferogram on the detector. A Fourier transform is then made of this interferogram. This transform has a signal spectrum above the cutoff frequency of the detector; and because of non-linearities in the detector and in the electronic signal processing circuitry, this transform also has a spectrum below the cutoff frequency of the detector. In accordance with the invention, two correction factors are calculated from this Fourier transform and these correction factors are then used to calculate a corrected interferogram. The first correction factor is evaluated by determining from the portion of the spectrum below the cutoff frequency a valve for the spectral signal at zero frequency. In addition, the integral of the square of the spectrum signal above the cutoff frequency is determined and the correction factor is found by dividing the signal at zero frequency by the integral of the square of the spectrum above the cutoff. The second correction factor is a function of the first correction factor and the integral of the spectrum signal above cutoff. These two corrections factors are then used in calculating a second order approximation to a corrected interferogram. Finally to produce the corrected Fourier transform, a Fourier transformation is made.

摘要翻译： 通过将来自源的辐射束分成两束并干涉这些光束以形成在现有技术中形成干涉图，以便在检测器上形成干涉图。 然后由该干涉图进行傅里叶变换。 该变换的信号频谱高于检测器的截止频率; 并且由于检测器和电子信号处理电路中的非线性，该变换也具有低于检测器的截止频率的频谱。 根据本发明，从该傅里叶变换计算出两个校正因子，然后使用这些校正因子来计算校正的干涉图。 通过从零频率处的频谱信号的频谱的截止频率以下的频谱的部分确定来评估第一校正因子。 此外，确定高于截止频率的频谱信号的平方的积分，并且通过将零频率处的信号除以高于截止频率的频谱的平方的积分来确定校正因子。 第二校正因子是第一校正因子和高于截止频谱信号的积分的函数。 然后将这两个校正因子用于计算校正干涉图的二阶近似。 最后，为了产生经校正的傅里叶变换，进行傅里叶变换。

公开(公告)号：US5923422A

公开(公告)日：1999-07-13

申请号：US17172

申请日：1998-02-02

申请人： Axel Keens ,  Norbert Rapp

发明人： Axel Keens ,  Norbert Rapp

IPC分类号： G01B9/02 ,  G01J3/45 ,  G01J3/453

CPC分类号： G01J3/45 ,  G01B9/02071 ,  G01B9/02084 ,  G01B9/0209 ,  G01J3/4535 ,  G01N2021/3595

摘要： A method of obtaining an FT spectrum according to Brault is improved in that the compensation filter is determined by recording a broad-band effective interferogram, carrying out complex Fourier transformation, forming a mean value of the phase spectra, converting the abscissa values into electrical frequencies, and establishing the transfer function of the detector and of the further signal processing elements, wherein the free parameters of the transfer function are chosen such that the phase response of the transfer function deviates as little as possible from the mean value of the phase spectrum of the effective recorded interferogram. If necessary, the determined transfer function is then digitized. The compensation filter is then determined as the inverse of the discrete transfer function. In this way, deconvolution of the signal processing elements transfer function from the spectra is facilitated in a particularly simple and effective manner.

摘要翻译： 改进了根据Brault获得FT光谱的方法，其中通过记录宽带有效干涉图来确定补偿滤波器，进行复数傅里叶变换，形成相位谱的平均值，将横坐标值转换成电频率 并且建立检测器和另外的信号处理元件的传递函数，其中选择传递函数的自由参数，使得传递函数的相位响应尽可能地从相位谱的平均值偏离 有效记录干涉图。 如果需要，则确定的传递函数被数字化。 然后将补偿滤波器确定为离散传递函数的倒数。 以这种方式，以特别简单和有效的方式促进信号处理元件从光谱传递函数的去卷积。

公开(公告)号：US5309217A

公开(公告)日：1994-05-03

申请号：US872433

申请日：1992-04-23

申请人： Arno Simon ,  Jurgen Gast ,  Axel Keens

发明人： Arno Simon ,  Jurgen Gast ,  Axel Keens

IPC分类号： G01J3/453 ,  G01B9/02

CPC分类号： G01J3/4532

摘要： An optical or Fourier infrared Fourier spectrometer with a two-beam interferometer with which the mirror drive is effected via two retroreflectors which are located on two 180.degree. displaced arms of a double pendulum. Deflecting mirrors are arranged between the beam splitter and the retroreflectors. The otherwise usual retroreflecting mirrors are not present. The beam splitter is displaced with respect to the plane of the pendulum. Thereby, a stable, easily aligned, and compact configuration is effected.

摘要翻译： 具有双光束干涉仪的光学或傅立叶红外傅立叶光谱仪，通过两个后向反射器实现镜面驱动，该反射器位于双摆的两个180度位移的臂上。 偏转镜布置在分束器和后向反射器之间。 否则通常的回射镜不存在。 分束器相对于摆锤的平面移位。 由此，实现了稳定，容易对准和紧凑的构造。