Rain gauge

Abstract

The invention relates to the technical field of rainfall measurement, and solves the problem of inaccurate measurement caused by too small or too large measurement interval of an optical rain gauge in the prior art. A rain gauge comprises an optical metering module, a piezoelectric counting module and a control circuit, the optical metering module is fixedly connected with the piezoelectric counting module, and the optical metering module and the piezoelectric counting module are electrically connected with the control circuit. The optical metering module comprises a light guide cover, a light source and a detection module opposite to the light source. When the piezoelectric counting module is activated once, the optical metering module works once, and each drop of rainwater falling on the light guide cover is counted and metered, so that repeated measurement of the raindrops is avoided, missing detection is also avoided, and the measurement accuracy is improved.

Description

technical field

[0001] The invention relates to the technical field of precipitation measurement, in particular to a rain gauge. Background technique

[0002] The optical rain gauge has an infrared light source. The infrared light emitted by the infrared light source propagates in the transparent upper cover, and is totally reflected at the interface between the upper cover and the air, and finally reaches the photodiode. When there is rain on the surface of the upper cover, due to the refraction of the rainwater The refractive index of the infrared light is greater than the refractive index of the air, and the infrared light no longer undergoes total reflection at the interface between the upper cover and the rainwater, but reflection and refraction occur, which causes the intensity of the infrared light received by the photodiode to weaken, and the conditioning circuit receives the electrical signal of the photodiode and outputs rainfall information. The optical rain gaug...

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