A method for measuring light absorption attenuation coefficient of water body

A technology of attenuation coefficient and measurement method, which is applied in the field of optical measurement, can solve problems such as many influencing factors, complex measurement operation, and large error, and achieve the effect of simple operation, reliable data support, and small error

Inactive Publication Date: 2017-12-29
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

These two methods have the problems of complex measurement operation, many influencing factors, and large errors.

Method used

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  • A method for measuring light absorption attenuation coefficient of water body
  • A method for measuring light absorption attenuation coefficient of water body
  • A method for measuring light absorption attenuation coefficient of water body

Examples

Experimental program
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Embodiment 1

[0061] A water body light absorption attenuation coefficient measuring instrument, such as figure 1 As shown, it is mainly composed of a light-emitting unit 1, a sampling unit 2, a detection unit 3, and a signal acquisition and analysis unit 4; the light-emitting unit 1 includes a main channel 11 and three sub-channels divided into one end of the main channel 11, which are respectively defined as absorption channels 12 , the attenuation channel 13 and the reference channel 14, the main channel 11 and the absorption channel 12 are directly connected, and the attenuation channel 13 is directly connected with the reference channel 14;

[0062] Such as figure 2 As shown, the main channel 11 is provided with a condenser cover 111, a light source 112 for sampling a high-stable tungsten halogen lamp, a light-condensing component 113 of a three-cemented achromatic lens, an attenuating component 114 composed of an attenuator, and a high-power aperture in the order of space. The diaph...

Embodiment 2

[0070] A method for measuring the light absorption attenuation coefficient of a water body can measure any water body in seawater, lake water and river water, and it adopts the measuring instrument described in embodiment 1, comprising the following steps:

[0071] Step 1. Turn on the light source 112 in the main channel 11 of the light-emitting unit 1 in the water body light absorption attenuation coefficient measuring instrument. is delivered to the first shutter assembly 116.

[0072] Step 2, open the first shutter assembly 116, so that the optical signal is transmitted to the first beam splitter 1171 and the second beam splitter 1172, and the first beam splitter 1171 and the second beam splitter 1172 divide the optical signal into three paths , enter the absorption channel 12, the attenuation channel 13 and the reference channel 14 respectively.

[0073] Step 3, introduce the water body to be tested into the first water sample channel 21 and the second water sample channe...

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Abstract

The invention provides a water body light absorption and attenuation coefficients measurement method. The method comprises the following steps: 1) light emitted by same light source is divided into three paths; 2) the following measurement can be carried out simultaneously; a first path of an optical signal is input to an absorption channel, passes through a water body to-be-measured to generate a first feedback light signal, the light signal is received for being as an absorption channel measure result; a second path of the optical signal is input to an attenuation channel, passes through the water body to-be-measured to generate a second feedback light signal, the light signal is received for being as an attenuation channel measure result; a third path of the optical signal is directly output to obtain a third feedback light signal, the light signal is received for being as a reference optical path measure result; and 3) according to the absorption channel measure result, the attenuation channel measure result and the reference optical path measure result, light absorption coefficients and attenuation coefficients of the water body can be obtained. According to the invention, in-situ measurement of an absorption spectrum of the water body can be carried out, operation is simple, error is little, and the method provides a good technical case for accurately measuring the attenuation coefficients and the absorption coefficients of the water body such as seawater.

Description

technical field [0001] The invention relates to an optical measurement method, in particular to a method for measuring the light absorption coefficient of water body and the light attenuation coefficient of water body. Background technique [0002] The light absorption / attenuation coefficient of water body represents the absorption and attenuation of light by water body. It is only related to the material composition in water body and does not depend on the geometric structure of the light field of water body. It is the two inherent optical properties of water body. When light passes through the medium, part of it is absorbed, and the other part is scattered away from the original direction of propagation; the joint action of absorption and scattering causes light attenuation. [0003] The changes of light absorption coefficient and light attenuation coefficient are closely related to water composition. In addition to pure water, the light absorption coefficient is derived ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 孙兆华邹国旺许占堂周雯王桂芬李彩杨跃忠曹文熙
Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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