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    • 4. 发明授权
    • Spectroscopic imaging system with ultrasonic detection of absorption of
modulated electromagnetic radiation
    • 具有超声波检测光谱成像系统的调制电磁辐射吸收
    • US5285260A
    • 1994-02-08
    • US909275
    • 1992-07-06
    • Charles L. Dumoulin
    • Charles L. Dumoulin
    • G01N21/25G01B17/04G01N21/17G01N25/16G01N29/00G01J3/52
    • G01N21/1702G01B17/04G01N21/171A61B5/0066
    • An optical interferometer and an ultrasonic distance measuring subsystem are used to obtain spectra from the surface of a sample. The interferometer uses a broadband electromagnetic radiation source and modulates the radiation at a frequency which is inversely proportional to wavelength. The modulated radiation impinges on the surface of interest where it is absorbed. The absorption of radiation causes the surface of the sample to expand. This change in dimension is then detected by the ultrasonic distance measuring subsystem which employs a single frequency acoustic radiation source to measure the instantaneous distance between the sample surface and the ultrasonic distance measurement subsystem. The detected changes in distance relate to amplitude of absorption at a given wavelength, thereby allowing absorption spectra for surface point to be generated indicating the chemical composition of each point of the surface.
    • 使用光学干涉仪和超声波距离测量子系统从样品的表面获得光谱。 干涉仪使用宽带电磁辐射源,并以与波长成反比的频率调制辐射。 调制的辐射照射在感兴趣的表面上,在其被吸收的地方。 辐射的吸收导致样品的表面膨胀。 然后,超声波距离测量子系统检测尺寸变化,该子系统采用单声频辐射源来测量样品表面和超声波距离测量子系统之间的瞬时距离。 检测到的距离变化与给定波长处的吸收幅度有关,从而允许产生指示表面各点的化学成分的表面点的吸收光谱。