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Method for implementing circular light ring strength uniformization and optical fiber mode disturbing apparatus

A homogenization and circular technology, applied in the processing field of circular halo homogenization, can solve the problems of residual noise, non-uniform light spectrum structure, etc., and achieve the effect of reducing residual noise, increasing detection accuracy, and improving the lower limit of detection

Inactive Publication Date: 2008-10-08
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, in the DOAS system, as mentioned above, due to the difference between the reference light path and the atmospheric measurement light path, the structure of the light spectrum and the atmospheric spectrum is not uniform. Limited by mismatching, the division of two spectra only removes the fixed structure of the PDA pixel but brings residual noise caused by different measurement optical paths

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  • Method for implementing circular light ring strength uniformization and optical fiber mode disturbing apparatus
  • Method for implementing circular light ring strength uniformization and optical fiber mode disturbing apparatus

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Embodiment Construction

[0019] see figure 1 .

[0020] A method for uniformizing the intensity of a circular halo in a differential absorption spectrometer. The differential absorption spectrometer includes a light source, a telescope integrated with sending and receiving, a corner reflector, an optical fiber, a monochromator, a photomultiplier tube detector, a data acquisition system, and a computer. A section of the fiber is extruded by a workpiece with a concave-convex surface, so that the high-order modes in the fiber are mixed, and the light spot with uniform output intensity distribution enters the monochromator.

[0021] see figure 2 .

[0022] The present invention has upper and lower metal splints 4 and 6 with concavo-convex structures on the surface, the surface of the metal splint 4 is covered with a layer of plastic protective layer 5, the surface of the metal splint 6 is covered with a layer of plastic protective layer 7, and the metal splint 4 and 6 pass through The four adjusting b...

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Abstract

The present invention discloses a method for implementing circular optical ring intensity uniformization in differential absorption spectrometer and fiber-optic mode scrambler. It is characterized by that it makes one part of optical fibre between telescope of differential absorption spectrometer and spectrometer be passed through a workpiece with concave-convex surface and squeezed so as to mix high-order mode in the optical fibre and make the outputted light spot with uniformly-distributed intensity be fed into monochrometer. The fibre-optic mode scrambler is characterized by that a part of optical fibre is clamped between two clamping plates which have concave-convex surfaces and mutually coincided. According to the fibre-optic mode-scrambling effect in the fibre-optic mode scrambler the high-order mode in the optical fibre can be mixed so as to output light spot with uniformly-distributed intensity.

Description

technical field [0001] The invention relates to a differential absorption spectrometer, in particular to a processing method for homogenizing the circular light ring received by the differential absorption spectrometer. Background technique [0002] Differential absorption spectroscopy (DOAS) technology is a method to invert the concentration of various gas molecules in the atmosphere by using the characteristic absorption spectra of various gas molecules in the ultraviolet and visible bands when light is transmitted in the atmosphere. The differential absorption spectrometer mainly includes: light source, Telescope, corner reflector, quartz optical fiber, spectrometer, photodiode array (PDA), data acquisition system and computer, etc. Optical signals are transmitted between the telescope and the spectrometer through optical fibers. [0003] The Cassegrain type telescope is used in the system, and the transmitting and receiving are designed as a whole through the corner ref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01J3/00
Inventor 谢品华司福祺刘建国刘文清李昂方武秦敏窦科李玉金
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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