Optical rainfall detecting method, detecting device and light guide device

Abstract

The invention discloses an optical rainfall detecting method, a detecting device and a light guide device. The optical rainfall detecting method includes transmitting parallel light onto the light guide device, repeatedly totally reflecting the parallel light in comprehensive fields of the light guide device and then ejecting the parallel light to certain positions according to preset directions; enabling light energy amplitude and frequency detectors to receive light signals via light receiving elements, detecting fluctuation frequencies and fluctuation amplitude of the light signals and transmitting detection signals to a central processing unit; enabling the central processing unit to acquire rainfall speeds and rainfall amounts according to the received detection signals. The parallel light is emitted by program-controlled light sources positioned inside the detecting device. The light receiving elements are located at the certain positions. The optical rainfall detecting method, the detecting device and the light guide device have the advantages that parts of the light can be refracted and scattered to air when raindrops drop on the surfaces of the light guide device, the light can leak when transmitted in the light guide device, light energy received by the light receiving elements can be reduced, the amplitude of reduction of the light energy can be directly affected by contact areas of the raindrops and the light guide device, accordingly, the sizes of the raindrops can be indirectly computed by the aid of reduction amplitude values, and the quantities of the raindrops can be computed according to frequencies of amplitude change of the light energy.

Description

technical field [0001] The invention relates to rain detection technology, in particular to an optical rain detection method, a detection device and a light guide. Background technique [0002] At present, rain gauges used to measure rainfall and rainfall intensity can be divided into tipping bucket type, siphon type, capacity grid type, weighing type, etc. in principle, and the most commonly used ones are tipping bucket type rain gauge and siphon type rain gauge. This kind of rain sensor has the disadvantages of the following aspects: [0003] 1. It needs regular cleaning and maintenance before it can work normally, otherwise the water collection channel will be blocked by debris; [0004] 2. Not sensitive to small rainfall or even unable to measure due to evaporation; [0005] 3. The error increases significantly during heavy rainfall; [0006] 4. Since the mechanical or electronic parts of the rain gauge are exposed to the air, it is easy to corrode and fail; [0007]...

AI Technical Summary

Problems solved by technology

[0004] 2. Not sensitive to small rainfall or even unable to measure due to evaporation;

[0005] 3. The error increases significantly during heavy rainfall;

[0006] 4. Since the mechanical or electronic parts of the rain gauge are exposed to the air, it is easy to corrode and fail;

[0007] 5. The rain gauge is required to be strictly level during installation, and the requirements for installation are relatively high;

[0008] 6. Large size;

[0009] 7. It is only suitable for static installation measurement, and cannot measure rainfall during motion;

[0011] 1. In principle, it belongs to single-point detection, and the measurement error and randomness are relatively large;

[0012] 2. Only qualitative detection of rainfall can be achieved but not quantitative detection;

[0014] 4. Due to poor precision and low integration, it can only be used in occasions or fields that do not require high precision, and cannot be used in fields that require high precision (such as meteorology and environmental industries)

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