A near-infrared spectrometer and its measuring method
A near-infrared spectrometer and spectrum technology, which is applied in the field of photoelectric analysis, can solve the problems of limited weak spectrum detection ability, etc., and achieve the effects of simple structure, improved detection ability, and increased speed
Active Publication Date: 2016-03-23
NANJING UNIV
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Problems solved by technology
The wavelength accuracy is 0.6nm. The instrument has passed various industrial field tests and has good stability. However, limited by the performance of a single detector, its ability to detect weak spectra is limited.
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[0029] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0030] Such as figure 1 As shown, the present invention provides a near-infrared spectrometer, comprising a light source 1, a parabolic mirror 2, a blazed grating 3, a digital micromirror device 4, a linear detector 5, a single photon detector 6, and a spectral information processing system 7; The light source 1 is set at the focal point of the parabolic reflector 2. The light source 1 is collimated by the parabolic reflector 2 and then projected onto the blazed grating 3. The blazed grating 3 is separated into monochromatic parallel light at the primary blaze angle and projected onto the digital on the micromirror device 4; the micromirror in the digital micromirror device 4 produces +12° and -12° deflection, and reflects the monochromatic parallel light to the linear detector 5 and the single photon detector 6 respectively; the spectral informati...
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The invention discloses a near-infrared spectrometer. The near-infrared spectrometer comprises a light source, a parabolic mirror, a blazed grating, a digital micromirror device, a linear detector, a single-photon detector and a spectral information processing system; the light source is arranged on the focus of the parabolic mirror, the light source is collimated through the parabolic mirror and then projected to the blazed grating, light is divided into monochromatic parallel light on a first-level blazing angle through the blazed grating, and the monochromatic parallel light is projected to the digital micromirror device; a micromirror in the digital micromirror device deflects by +12 degrees and -12 degrees to respectively reflect the monochromatic parallel light on the linear detector and the single-photon detector; fusion processing is performed on spectral information received by the two detectors through the spectral information processing system to obtain spectral intensity of an original spectral signal. The invention further discloses a measuring method of the near-infrared spectrometer. The single-photon detector is introduced into the near-infrared spectrometer, so that the ability to detect trace substances and weak spectra is improved, sensitivity and precision are improved, and the structure is simple.
Description
technical field [0001] The invention relates to the field of photoelectric analysis, in particular to a near-infrared spectrometer and a measurement method. Background technique [0002] Near Infrared light (Near Infrared, NIR) is an electromagnetic radiation wave between visible light (VIS) and mid-infrared (MIR). The first non-visible region found in the absorption spectrum. The near-infrared spectrum region is consistent with the combined frequency of the vibration of hydrogen-containing groups (OH, NH, CH) in organic molecules and the absorption region of all levels of frequency multiplication. By scanning the near-infrared spectrum of the sample, the hydrogen-containing groups of organic molecules in the sample can be obtained. The characteristic information of the group, and the use of near-infrared spectroscopy to analyze samples has the advantages of convenience, rapidity, efficiency, accuracy and low cost, does not damage samples, does not consume chemical reagents...
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IPC IPC(8): G01J3/28
Inventor 张益昕张旭苹杨欢王顺王光辉
Owner NANJING UNIV