Bypass concentration calibration system with variable light path

A calibration system and concentration technology, applied in the field of environmental optical measurement, can solve the problems of increasing the difficulty of instrument debugging and maintenance costs, and achieve the effects of improving operability and flexibility, high work independence, and improving utilization

Inactive Publication Date: 2011-04-13
FUDAN UNIV
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Problems solved by technology

The concentration calibration system in the prior art has the following disadvantages: it increases the difficu

Method used

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  • Bypass concentration calibration system with variable light path
  • Bypass concentration calibration system with variable light path

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Embodiment Construction

[0017] Attached below figure 1 The working mode of the present invention is further described.

[0018] see figure 1 , The main optical path of the measuring instrument is composed of light source 11, reflector 12 and spherical mirror 14; the bypass concentration calibration device is composed of reflectors 21, 24, quartz convex lens 22, optical baffle plate 23, sample pool 26 and so on.

[0019] When the measuring instrument is working normally, its measuring light enters the bypass system through the opening 32 on the partition 3. At this time, the optical shielding plate 23 in the bypass system is in a vertical position, and the light passes through the sample cell 26 after being reflected by the reflector 24. When entering the optical path receiving system, the sample cell is clean air or nitrogen during normal measurement.

[0020] When concentration calibration is required, the optical baffle plate 23 is rotated 90 degrees clockwise and is in a horizontal position, blo...

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Abstract

The invention relates to a bypass concentration calibration system with a variable light path, belonging to the technical field of environmental optical measurement. The bypass concentration calibration system comprises a main transmitting light path unit and a main receiving light path unit, and a partition with through holes is arranged between the two units. In the invention, a bypass optical system is introduced, a light path space is increased, and sample cells with different lengths can be replaced during concentration calibration so as to obtain light paths with different lengths. Evenif a standard gas with one concentration is used, different equivalent concentrations can be obtained to realize multi-concentration calibration because the lengths of the sample cells are different.The invention has the function of changing the length of the sample cell so as to realize light path change, and meanwhile, since a calibrated light path is independent of a measured light path, whenan instrument is calibrated, the accuracy of the main light path is not influenced, and therefore, the operability and the flexibility of the instrument are increased, multiple equivalent concentrations can be obtained by using the standard gas with one concentration, and the operation cost of the instrument can be saved.

Description

technical field [0001] The invention belongs to the technical field of environmental optical measurement, and in particular relates to a bypass concentration calibration system with variable optical path, which is used for calibrating different equivalent concentrations of a long-distance differential optical system. Background technique [0002] The long-range differential absorption spectrum gas pollution monitoring device is a major atmospheric environment monitoring instrument. Its measurement principle is to use the ultraviolet-visible absorption of light radiation by gas. The main structure of the instrument is a telescope system integrating transmitting and receiving, a spectroscopic system and Data processing system, the instrument work is to carry out concentration calibration regularly according to the requirements, the calibration method is to let a certain concentration of standard gas pass through the calibration sample pool of the instrument to calibrate the ins...

Claims

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Application Information

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IPC IPC(8): G01N21/01G01N21/31F21V7/00F21V5/04
Inventor 周斌
Owner FUDAN UNIV
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