Method for eliminating influence of background light and thermal noise on measurement accuracy of atmospheric extinction coefficient

A technology of atmospheric extinction coefficient and measurement accuracy, which is applied in measurement devices, measurement of scattering characteristics, material analysis by optical means, etc. Reduce the impact of background light and thermal noise, etc.

Inactive Publication Date: 2011-09-28
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, these methods can only reduce the size of the background light and thermal noise itself, and reduce the influence of the background light and thermal noise on the atmospheric extinction coefficient, but cannot fundamentally eliminate the

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  • Method for eliminating influence of background light and thermal noise on measurement accuracy of atmospheric extinction coefficient
  • Method for eliminating influence of background light and thermal noise on measurement accuracy of atmospheric extinction coefficient
  • Method for eliminating influence of background light and thermal noise on measurement accuracy of atmospheric extinction coefficient

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Embodiment Construction

[0009] The invention describes a method for eliminating the influence of background light and thermal noise on the detection accuracy of the atmospheric extinction coefficient. The main inventive methods and technologies are as follows:

[0010] First, reduce the output energy of the laser, and measure the scattered echo signals of laser beams with different energies. In a similar time interval, the time between the two echo signals is relatively short. It can be considered that the change in the state of the atmosphere is very small and can be ignored. Therefore, it can be considered that , the background light and thermal noise signals are equal in the two echo signals. The true and reliable atmospheric extinction coefficient can be obtained by subtracting the two echo signals, canceling the background light and thermal noise signals, and inverting the two echo difference equations. The specific ideas are as follows:

[0011] The specific theoretical analysis process is as...

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Abstract

The invention discloses a method for eliminating influence of background light and thermal noise on measurement accuracy of an atmospheric extinction coefficient. The method comprises the following steps that: firstly, output energy of a laser is reduced and scattering echo signals of laser beams with different energies are measured; because background light signals and thermal noise signals in two echo signals are equal in a short interval, the background light signals and the thermal noise signals are mutually offset through a subtraction of the two echo signals; lastly, a equation of the subtraction of the two echo signals is inversed to obtain a real atmospheric extinction coefficient. According to the present invention, a new experiment and a new inversion method are provided for effective eliminating the influence of the background light and the thermal noise on the measurement accuracy so as to obtain an exact and reliable atmospheric extinction coefficient.

Description

technical field [0001] The invention relates to a method for eliminating the influence of background light and thermal noise on the measurement accuracy of atmospheric extinction coefficient. Background technique [0002] At present, the main method to eliminate the influence of background light and thermal noise on the detection of atmospheric extinction coefficient is to reduce the size of background light and thermal noise, and reduce the background light by using night experiments, using interference filters, and reducing the field of view of the telescope. The size of the detector; by reducing the temperature of the detector to reduce the thermal noise of the detector. However, these methods can only reduce the size of background light and thermal noise itself, and reduce the influence of background light and thermal noise on the atmospheric extinction coefficient, but cannot fundamentally eliminate the influence of background light and thermal noise on the detection ac...

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Application Information

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IPC IPC(8): G01N21/47G01N21/01
Inventor 曹念文
Owner NANJING UNIV OF INFORMATION SCI & TECH
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