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Method for determining sand by infrared analysis

An infrared test and infrared technology, applied in the field of sand concentration measurement, can solve the problems of large error of measurement value and influence of measurement accuracy, etc.

Inactive Publication Date: 2007-03-21
INST OF MECHANICS - CHINESE ACAD OF SCI +1
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Problems solved by technology

Although these methods have their own characteristics, the measurement accuracy of some of them will be affected by the color of water quality, and some are only suitable for measuring water quality with low sand content
For example, the photoelectric method basically does not work for colored water, which makes the measurement error larger

Method used

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  • Method for determining sand by infrared analysis
  • Method for determining sand by infrared analysis
  • Method for determining sand by infrared analysis

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Embodiment Construction

[0014] As shown in Figure 1, the device specifically used in the present invention includes a frequency modulation and power amplifier unit 1, an infrared emitting unit 2, an infrared receiving unit 3, an optical processing unit 4, a pre-amplification processing unit 5, a signal superposition unit 6, and a mediation amplification unit 7. A / D conversion unit 8 and power supply unit 10, wherein,

[0015] The frequency modulation and power amplifier unit 1 is used to adjust the infrared frequency according to the different particle sizes of the sand, so that the frequency of the infrared signal emitted by the infrared emitting unit 2 can be optimized;

[0016] The infrared emitting unit 2 is used for emitting infrared rays to sandy water bodies;

[0017] The infrared receiving unit 3 is used to collect infrared signals scattered by sandy water;

[0018] The optical processing unit 4 is used for filtering the infrared light emitted and received by the infrared transmitting unit 2...

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Abstract

The invention discloses an infrared measurement including: 1) first to emit the infrared ray to the water without the sand from the emitter and adjust the carrier wave to zero; 2) the emitter emits some frequency infrared ray to the water with the sand; 3) the infrared receiver collects the infrared signal reflected and dispersed in the water; 4) overlapping the signal with the carrier wave signal and output an adjusted frequency signal changed by the sediment concentration; 5) last to reduce a output voltage after amplifying by the demodulating amplifier, the voltage is the signal relates to the sand concentration. The invention can measure the sand concentration of all kinds of the water because the inferred ray has the small reflectivity in the clean water and it will increase with the sand concentration.

Description

technical field [0001] The invention relates to a method for measuring sediment content used in river engineering, harbor engineering and ocean engineering. Background technique [0002] The measurement of sediment concentration is an important hydrological parameter in river engineering, harbor engineering, and ocean engineering, and its importance is even more shown in physical model tests. The traditional measurement method is sampling, drying and weighing. The measurement accuracy of this method depends on the sample taken. Generally speaking, after the sample is determined, the measurement accuracy is very high. This method is also the basis for evaluating the accuracy of other physical measuring instruments. However, the above method consumes manpower and material resources, and takes a long time, especially when studying dynamic parameters such as instantaneous concentration and vertical distribution of sandy water flow, it seems powerless. In order to overcome the...

Claims

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Application Information

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IPC IPC(8): G01N21/41G01N21/17
Inventor 任志远吴晓华任育民
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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