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Optical fiber spectrometer wavelength calibration method

An optical fiber spectrometer and a calibration method technology are applied in the field of wavelength calibration of optical fiber spectrometers, which can solve the problems of difference in calibration results, large calibration error of optical fiber spectrometers, and high requirements, and achieve the effect of improving calibration accuracy.

Inactive Publication Date: 2008-04-09
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0016] In order to overcome the large error in the calibration of fiber optic spectrometers in the prior art, and the high requirements for the three standard spectral lines used for calibration, such as large span and uniform distribution, etc., and some given parameters are required, and when the given parameters take different values When , the calibration results also appear to be different

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  • Optical fiber spectrometer wavelength calibration method
  • Optical fiber spectrometer wavelength calibration method

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Embodiment Construction

[0034] Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. As shown in Figure 1, it is the structure of an ordinary fiber optic spectrometer: it is composed of optical fiber 1, FC coupling probe 2, spherical mirror 3, grating 4, CCD line array 5, and computer operating system 6; the optical path adopts a horizontally symmetrical optical path, and the center of the grating Located on the symmetry axis of the horizontally symmetrical optical path, the FC coupling probe 2 and the CCD linear array 5 are located on the focal plane of the spherical mirror.

[0035] According to the principle of geometric optics, the optical path of the fiber optic spectrometer can be simplified to the optical path shown in Figure 2. In the experiment, the first-order diffraction fringes were used, so it can be known from the grating equation:

[0036] d(sinβ-sinα)=λ (6)

[0037] Where: β-incident angle, α-diffraction angle, λ-wavele...

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Abstract

The invention discloses a wavelength calibration way for a optical fiber spectrometer, and consists of the following steps, A) a standard light source is applied, standard spectrum is collected through the spectrometer, the image element order number ki of spectrometer receiving element linear array CCD is determined corresponding to the standard light source of different practical wavelength Lambadai; B) the arbitrary three practical wavelength Lambada i and the corresponding image element order number ki are chosen, and in accordance with the above formula, a1, a2, and a3 are determined; C) according to the values of a1, a2, a3 from step B), the calibration calculation wavelength value Lambadai is determined corresponding to every image element order number ki, wherein, the Lambadai is a calibrated wavelength value. The calibrating way of the optical fiber spectrometer is provided by the present invention, the calibration deviation of the calibrating way is much smaller than the calibration deviation of the prior art, and accurate calibration can be done with 3 arbitrary standard spectrum lines, not only the flexibility of the calibration is improved but also the application is easier and more convenient. The invention discloses the calibrated spectrometer applying the above mentioned way at the same time.

Description

technical field [0001] The invention relates to a method for calibrating optical instruments, in particular to a method for calibrating the wavelength of an optical fiber spectrometer. Background technique [0002] Optical fiber spectrometer is an instrument that can be used for spectral measurement in the ultraviolet-visible-near-infrared spectral region. Its measurement wavelength range is generally 200-1100nm, and it is widely used in chemical analysis, industrial detection, aerospace remote sensing and other fields. In recent years, with the introduction of optical fiber, CCD and computer technology, the technology of fiber optic spectrometer has been developed rapidly, which can realize online real-time measurement, and has the advantages of information collection, processing, storage, etc., so that spectral measurement technology is widely used in industry, scientific research It has been widely used in the field. Since the light intensity absorbed or emitted by the s...

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Application Information

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IPC IPC(8): G01N21/01G01N21/17G01J3/00
Inventor 杨乾锁彭志敏竺乃宜
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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