Novel microwave radar ultra-thin water flow determination sensor

Abstract

The invention discloses a novel microwave radar ultra-thin water flow determination sensor which comprises a signal transmitting terminal, a signal receiving terminal and a micro-processing MCU. After an emission signal of the signal transmitting terminal is reflected by a target water surface, a generated echo signal is received by the signal receiving terminal, the signal receiving terminal carries out frequency mixing processing on the received echo signal and the emission signal, a difference frequency signal whose frequency is difference between frequency of the echo signal and frequency of the emission signal is obtained, and the micro-processing MCU samples the frequency of the difference frequency signal and determines a flow velocity according to a corresponding relation between the frequency of the difference frequency signal and a water velocity of the target water surface. According to a microwave Doppler effect, the microwave sensor signal receiving terminal of the invention carries out frequency mixing processing on the echo signal and the emission signal to obtain the difference frequency signal, and through frequency sampling, a present water velocity is determined. The sensor is practical, is accurate in measurement, and is suitable for the field of determining non-pressure ultra-thin water head and a surface runoff water velocity in non-uniform low speed flow.

Description

Technical field [0001] The invention relates to a sensor, in particular to a new type of microwave radar ultra-thin water flow measuring sensor. Background technique [0002] Soil erosion will cause great harm to human production and life, mainly manifested in such as destruction of soil fertility, aggravation of gully development, soil erosion, reservoir siltation, river blockage, and river bed elevation. In the process of soil erosion, water flow is the dominant player that produces soil erosion and sediment movement. Therefore, the study of water flow velocity is one of the basic factors for quantitative analysis of soil erosion and sediment carrying capacity of runoff. For thin-layer water flow velocity measurement, when the runoff velocity of the ultra-low head is slow and small, the traditional sensor will be unable to measure due to the correspondingly small water force, or even no water force. [0003] The prior art provides a measurement method that relies on electrolyte ...

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Problems solved by technology

However, this method is still in the stage of laboratory research and has not been promoted in the field of practical application.

Moreover, it has been verified that using the above-mentioned electrolyte pulse method for measurement has certain disadvantages in practical applications: First, because the ground is not regular, the flow direction of the water flow is not fixed, and the ground will easily change for a long time. This makes the layout of the sensor very difficult; the second is that the measurement method will be greatly disturbed by the outside world. For example, if the water contains a small amount of electrolyte, it will cause errors in the measurement results; , so that it is necessary to add raw materials to the equipment regularly, resulting in waste of manpower and increased costs

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