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A method for measuring absorption coefficient and scattering coefficient of water quality components

A technology of absorption coefficient and scattering coefficient, which is applied in the field of water body index measurement, can solve the problems of error, low backscattering coefficient measurement accuracy, and large difference of impurities, so as to save time and cost

Active Publication Date: 2018-10-23
SUN YAT SEN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] For the measurement of the absorption coefficient of water quality components, although it is convenient to accurately measure the filtered samples by using the measurement method of filtering out and drying impurities, the color of the filtered and dried samples has changed, and the measured absorption coefficient The impurities in the natural state water body are very different, and there will be significant errors when used in water quality remote sensing or water body composition analysis; the problem is even more serious after decolorizing the sample
In addition, this method is completely ineffective for impurities with extremely small particle size and molecular state
[0004] For the laboratory measurement of the backscattering coefficient, since the scattering coefficient of most water quality components is much smaller than the absorption coefficient, except for impurities with strong scattering such as suspended sand, the measurement accuracy of the backscattering coefficient of most water quality components is not high
However, the measurement method using a large pool is currently only suitable for the measurement of the scattering coefficient of suspended sediment and algae due to the artificial preparation of the required concentration of impurity-containing water, which is costly in terms of manpower, funds and time.

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  • A method for measuring absorption coefficient and scattering coefficient of water quality components
  • A method for measuring absorption coefficient and scattering coefficient of water quality components
  • A method for measuring absorption coefficient and scattering coefficient of water quality components

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Embodiment 1

[0071] In this embodiment, taking the measurement of suspended sediment water body as an example, the method for measuring the absorption coefficient and scattering coefficient of water quality components described in the present invention is described in detail. This embodiment includes the following steps:

[0072] S1 Measure the radiance L(θ) of the water body to be tested and the radiance L of the standard plate placed horizontally through the spectrometer 0 , and calculate the water surface reflectance R at the scattering angle θ of the water body to be measured w (θ);

[0073]

[0074] in:

[0075] L(θ) is the radiance of the water body measured by the axis of the spectrometer probe in the direction of the angle θ with the sun's rays;

[0076] L 0 is the standard plate radiance;

[0077] R 0 is the reflectance of the standard plate.

[0078] The method of the present invention is suitable for selecting a single polluted water body with a certain depth to measure...

Embodiment 2

[0137] The difference between this embodiment and Embodiment 1 is that in this embodiment, the water body to be detected is eutrophic water body.

[0138] With reference to the steps of Example 1, in this example, first get the pond where green algae broke out, and measure the water surface reflectance R w (θ), while collecting the extinction coefficient k and the impurity mass-volume concentration D of the water sample to be tested, the water body in this example is the water body when the green algae broke out, and the impurities in the water are mainly green algae (cyanobacteria), and the small amount of other components has an impact on the spectrum Negligible, and the measured water reflectance R w (θ), the extinction coefficient is brought into the radiative transfer equation ④ and the extinction coefficient equation ⑤, and the α of the impurity in water-green algae is calculated s and the scattering coefficient β s .

[0139] Figure 5 It is a schematic diagram of t...

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Abstract

The invention relates to a measurement method for a water component absorption coefficient and scattering coefficient. According to the invention, a spectrometer is employed to detect the parallel light penetrating a glass cylinder under different water depths and the irradiance of transmission light reflected by a standard board to obtain an impurity extinction coefficient, then combining the effluent reflectivity, impurity mass-volume concentration and other parameters of to-be-measured water, calculating the water component absorption coefficient and scattering coefficient through a radiation transfer equation and an impurity extinction coefficient equation. The measurement result obtained by the method provided by the invention conforms to the actual coincidency of impurities in natural water, and when the method is used for quantitative remote sensing of water quality and water quality optical method analysis, the precision is high. At the same time, the method provided by the invention is applicable to water of all photoactive impurity components including ultra-fine grain components and molecular state impurities, and provides a new thinking for the problem of narrow water detection range in the prior art.

Description

technical field [0001] The invention relates to the field of measuring water body indexes, in particular to a method for measuring the absorption coefficient and scattering coefficient of water quality components. Background technique [0002] The absorption coefficient and backscattering coefficient of water quality components are the basis of water quality analysis by optical methods, and are also the basic data of quantitative remote sensing of water quality. For the measurement of the absorption coefficient of water quality components, the currently commonly used method is to filter out suspended matter such as suspended sand and algae from the water with filter paper, then dry, and some have to be decolorized, and then measure its absorption with a spectrometer coefficient. There are two main methods for measuring the backscattering coefficient of impurities in water. One is to measure the scattering coefficient of impurities in the water in the container under certain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/49
Inventor 秦雁邓孺孺梁业恒熊龙海刘旭拢刘英飞卢世军刘永明林梨
Owner SUN YAT SEN UNIV