An inclined float type siphon type weak reflection fiber grating rain gauge and rain gauge array

Abstract

The invention discloses an inclined float type siphon type weak reflection optical fiber grating rain gauge, which is characterized in that it comprises a rain gauge cylinder with a base, and the rain gauge cylinder is provided with a funnel for receiving rain, between the inner wall of the rain gauge cylinder and the base There is an inclined support plate between them, and a wedge-shaped inclined float is placed on the support plate. One end of the wedge-shaped inclined float is connected to the base, and the other end is connected to the optical fiber. This end of the optical fiber is the light entrance end. The fixed column is connected to each other, and this end of the optical fiber is the light exit end, and a weak reflection fiber grating is arranged in the optical fiber, and the light entrance and light exit are connected to the optical fiber sensor network, and the rain gauge is also connected with a siphon. The rain gauge and the rain gauge array have low cost, simple network layout, good stability, large measuring range and high precision.

Description

technical field [0001] The invention relates to rainwater measuring equipment technology, in particular to an inclined float type siphon type weak reflection optical fiber grating rain gauge and a rain gauge array. Background technique [0002] Precipitation measurement is an extremely important way to obtain hydrological data. Precipitation affects the economic construction of the entire region. For example, urban planning, agriculture, and industrial development must consider the precipitation in the region. As a common tool for meteorological observation, the rain gauge is of great significance to study its related technologies. [0003] At present, the main types of rain gauges are tipping bucket rain gauge, siphon rain gauge and weighing rain gauge. Among them, the siphon rain gauge has the advantages of strong continuous monitoring ability, high accuracy and low operating cost. occupies an important place. However, traditional siphon rain gauges require manual data c...

AI Technical Summary

Problems solved by technology

However, traditional siphon rain gauges require manual data collection. For unattended, remote mountainous areas without grid access, virgin forests, border islands and other detection sites, it not only requires automatic continuous detection under the condition of no one and no electricity. , but also to overcome the harsh environment to ensure the stability of long-term work

[0004] In recent years, with the vigorous development of fiber grating sensors, fiber grating sensors have attracted people's attention in rainfall sensing due to their high sensitivity, strong anti-electromagnetic interference ability, and convenient networking. For example, Feng Jun applied for an invention patent "using Optical fiber measurement rain gauge and railway disaster prevention rainfall monitoring system (Application No. 201210333228.3)" introduced three types of rain gauges that use fiber gratings as passive sensing devices: siphon type, tipping bucket type, and weighing type rain gauge. The networking method of railway rainfall detection is briefly described, but it fails to consider the practical problem of high optical power loss in long-distance transmission, and the networking part does not describe the solution in detail

On the basis of the research on the above-mentioned fiber optic rain gauge, Sun Qizhen and others have designed a new type of siphon fiber grating rain gauge in the invention patent "rainfall monitoring network and method using fiber grating siphon rain gauge (application number 201310240624.6) However, the vertically suspended float structure has high requirements for the installation and stability of the rain gauge. In practical applications, it is inevitable that the rain gauge will be damaged. Vibration and inclination due to external interference. At the same time, the fragility of fiber gratings also seriously hinders the effective range of single rainfall monitoring. The excessive use of optical devices such as couplers in this technical solution will also make the sensor network Due to the excessive loss of optical power, the sensing distance is greatly limited

[0005] In order to solve the problem of excessively high optical power filtered by traditional fiber gratings, weak reflection fiber grating arrays are used in various engineering measurements, such as the invention patent of Hu Junhui et al. "A Vibration Measurement Device and Measurement Method Based on Weak Reflection Gratings (Application No. 201711263788.5)", a quasi-distributed weak reflection fiber grating vibration sensor system with long-distance and real-time monitoring is provided by using narrow linewidth lasers and modulating pulsed light sources

However, in this patented method, the front-end needs to modulate the pulse, and the back-end needs professional programming for data processing, which is cumbersome and technically difficult.

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