Fiber-optic Measurement Method Based on Multiple Reflection Visibility
A technology of multiple reflections and measurement methods, which is applied in the direction of transmittance measurement, etc., can solve problems such as large errors and difficult evaluation of error values
Active Publication Date: 2020-10-23
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology
When there are many absorbing components such as black carbon in the atmosphere to be measured, the error of the measured results is large and the error value is difficult to evaluate.
In addition, the transmittance lidar requires no shelter and uniform atmospheric conditions within the kilometer-level measurement range. The calculation result of the visibility is related to the selection range of the slope, and there is a certain degree of uncertainty.
The above-mentioned measurement equipment for measuring visibility is also easily constrained by environmental factors. For example, in order to avoid the influence of sunlight, the receiving end of the scatterometer should be installed facing away from the sun; while the transmittance lidar assumes the natural illumination intensity received by the horizontal atmospheric column does not vary with distance
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[0035] Such as figure 1 As shown, the fiber-optic measurement method based on the visibility of multiple reflections transmits the laser light through a single-mode fiber to a beam splitter and splits it into two beams of light with equal energy, and the two beams are respectively transmitted in two single-mode fibers of equal length , one beam of light passes through the circulator and then passes through the fiber collimator and enters the Heriott cell. Its energy is attenuated due to the interaction with the atmosphere to be measured in the cell. Reflection greatly prolongs the action distance between the beam and the atmosphere to be measured. After multiple reflections, the beam returns to the original path, passes through the collimator again and is transmitted along the optical fiber, and is converted into an electrical signal after passing through the circulator. The other beam passes through the The optical fiber is directly converted into the electrical signal 2, and...
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The invention discloses an optical fiber type measurement method based on visibility of multiple times of reflection. Lasers modulated by a signal generator are transmitted in an optical fiber after passing through an isolator, two paths of light identical in energy are formed after the lasers pass through a beam splitter, one path of light enters the optical fiber again after being reflected by a Herriott cell many times and is subjected to photovoltaic conversion to form a first electric signal, and the other path of light is directly subjected to photovoltaic conversion to form a second electric signal; the transmittance is obtained through the specific value of the first electric signal and the second electric signal, and then visibility information is formed on the basis of an acquired extinction coefficient. The method has the advantages of being convenient to operate, high in detecting speed, easy to miniaturize, high in detecting sensitivity and the like.
Description
technical field [0001] The invention relates to the field of visibility measurement methods, in particular to an optical fiber-based measurement method for visibility based on multiple reflections. Background technique [0002] Visibility is defined for meteorological purposes as a quantity estimated quantitatively by human observers, and observations made in this manner are widely used in many fields, including transportation, military, environment, and climate change. [0003] Visibility is inversely proportional to the horizontal extinction coefficient of the atmosphere. The extinction coefficient is the part of the luminous flux lost by the parallel light beam emitted by the incandescent light source with a color temperature of 2700K passing through the path of unit distance in the atmosphere. At present, the instruments for obtaining visibility mainly include two types: (1) measuring the scattering of light by air in a small space, which can be divided into backscatteri...
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IPC IPC(8): G01N21/59
CPCG01N21/59
Inventor 邵士勇陶宗明李树旺李学彬郝其龙刘强
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI