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公开(公告)号：US20190195688A1
公开(公告)日：2019-06-27
申请号：US16229355
申请日：2018-12-21
CPC分类号： G01J3/0229 , G01J3/10 , G01J3/18 , G01J3/2803 , G01J3/44 , G01N21/65 , G01N2201/06113 , G01N2201/0635 , G01N2201/0638
摘要： In swept source Raman (SSR) spectroscopy, a swept laser beam illuminates a sample, which inelastically scatters some of the incident light. This inelastically scattered light is shifted in wavelength by an amount called the Raman shift. The Raman-shifted light can be measured with a fixed spectrally selective filter and a detector. The Raman spectrum can be obtained by sweeping the wavelength of the excitation source and, therefore, the Raman shift. The resolution of the Raman spectrum is determined by the filter bandwidth and the frequency resolution of the swept source. An SSR spectrometer can be smaller, more sensitive, and less expensive than a conventional Raman spectrometer because it uses a tunable laser and a fixed filter instead of free-space propagation for spectral separation. Its sensitivity depends on the size of the collection optics. And it can use a nonlinearly swept laser beam thanks to a wavemeter that measures the beam's absolute wavelength during Raman spectrum acquisition.
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公开(公告)号：US10656012B2
公开(公告)日：2020-05-19
申请号：US16229355
申请日：2018-12-21
IPC分类号： G01J3/44 , G01J3/02 , G01J3/10 , G01J3/28 , G01J3/18 , G01N21/65 , G01J1/42 , G01J3/433 , G02B6/293
摘要： In swept source Raman (SSR) spectroscopy, a swept laser beam illuminates a sample, which inelastically scatters some of the incident light. This inelastically scattered light is shifted in wavelength by an amount called the Raman shift. The Raman-shifted light can be measured with a fixed spectrally selective filter and a detector. The Raman spectrum can be obtained by sweeping the wavelength of the excitation source and, therefore, the Raman shift. The resolution of the Raman spectrum is determined by the filter bandwidth and the frequency resolution of the swept source. An SSR spectrometer can be smaller, more sensitive, and less expensive than a conventional Raman spectrometer because it uses a tunable laser and a fixed filter instead of free-space propagation for spectral separation. Its sensitivity depends on the size of the collection optics. And it can use a nonlinearly swept laser beam thanks to a wavemeter that measures the beam's absolute wavelength during Raman spectrum acquisition.
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公开(公告)号：US20170059412A1
公开(公告)日：2017-03-02
申请号：US15254855
申请日：2016-09-01
CPC分类号： G01J3/453 , G01J3/0259 , G01J3/4531 , G01J3/4532
摘要： A non-paraxial Talbot spectrometer includes a transmission grating to receive incident light. The grating period of the transmission grating is comparable to the wavelength of interest so as to allow the Talbot spectrometer to operate outside the paraxial limit. Light transmitted through the transmission grating forms periodic Talbot images. A tilted detector is employed to simultaneously sample the Talbot images at various distances along a direction perpendicular to the grating. Spectral information of the incident light can be calculated by taking Fourier transform of the measured Talbot images or by comparing the measured Talbot images with a library of intensity patterns acquired with light sources having known wavelengths.
摘要翻译： 非近轴Talbot光谱仪包括用于接收入射光的透射光栅。 传输光栅的光栅周期与感兴趣的波长相当，以便允许Talbot光谱仪在傍轴极限外运行。 通过透射光栅透射的光形成周期性的Talbot图像。 采用倾斜检测器同时沿垂直于光栅的方向以不同距离对Talbot图像进行采样。 入射光的光谱信息可以通过对所测量的Talbot图像进行傅立叶变换或通过将测量的Talbot图像与用已知波长的光源采集的强度图案的文库进行比较来计算。
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