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Rika Sensor is a weather sensor manufacturer and environmental monitoring solution provider with 10+ years of industry experience.

What are the common rain gauges? What are the advantages of optical rain sensors compared to traditional rain gauges

by:Rika Sensors     2021-09-23
What are the common rain gauges? What are the advantages of optical rain sensors compared to traditional rain gauges
Rainfall refers to the process by which various hydrometeors fall from the sky to the ground in different ways. First, in the atmosphere, clouds are formed under the influence of terrain and heat from the air. After expansion and cooling, water molecules condense and fall when they encounter suspended particles. Rainfall is an important part of the atmospheric water cycle. Rainfall information is the main object of atmospheric physical processes and rainfall research. It is also an important indicator in the fields of environmental monitoring and agro-meteorological safety. In production and life, people use a variety of rain gauges to measure and study rainfall.

Traditional rain gauges mainly include weighing type, siphon type and tipping bucket type

The weighing type rain sensor measures the weight of the precipitation, and then converts it into rainfall, which is calculated based on the change in the weight of the received rainfall. The size will be affected by evaporation during the weighing process.

The siphon rain gauge is composed of a water container, a pontoon chamber, a housing and a self-recording clock. Rainwater enters the rain gauge through the rain-bearing port and enters the pontoon chamber through the funnel. The pontoon chamber drives the float with the increase of rainwater. There is a stylus, and the stylus records the increase in rainfall on the form. When the rainfall increases to the siphon mouth, the siphon starts to empty the pontoon chamber, so as to record the rainfall process back and forth. The performance of the suction tube in the siphon rain gauge directly affects the measurement accuracy of the siphon rain gauge.

The tipping bucket rain gauge is a mechanical bistable weighing structure. During the working process, the rain gauge on the top layer receives precipitation, and the left and right tipping chambers are alternately located below the funnel to receive rainwater. When the rain is greater than the measurement, the tipping bucket is turned over, and the funnel is located below the other tipping chamber to receive rainwater, so as to reciprocately measure the rainfall. When the tipping bucket rain gauge is working, when the tipping bucket is turned over, the upper tipping bucket should stop the water intake and quickly empty the water, and the lower tipping bucket should be quickly converted to the upper tipping bucket to receive rainwater. However, in the actual turning process, the funnel will still enter water, causing measurement errors during the turning process.

These three types are all mechanical rain gauges. During the measurement process, they are susceptible to measurement errors due to the influence of internal components, and the installation is inconvenient. With the development and progress of optical technology, people try to apply optics to the measurement of rainfall and successfully develop an optical rainfall sensor.

The optical rain sensor RS-GYL-*-1 adopts the principle of infrared light sensing, and uses the characteristic of different light transmission properties when there are water droplets in the air to judge the rainfall. It has built-in multiple optical probes, and the rainfall detection is reliable. Traditional mechanical rain sensor, optical rain sensor is smaller, more sensitive and reliable, smarter and easier to maintain. It can be widely used in industries and fields such as smart irrigation, ship navigation, mobile weather stations, automatic doors and windows, and geological disasters.

What are the advantages of optical rain gauges compared to traditional rain gauges:

1. High precision: optical measurement, accurate measurement

2, high sensitivity: using electronic optics and one A series of microelectronic filtering, amplification and detection technology, this principle has sensitivity advantages compared with conventional mechanical rain gauges.

3. Maintenance-free: completely enclosed structure, no mechanical parts, no wear, and not easy to be blocked by fallen leaves.

4. High reliability: it can work normally under high temperature and high humidity environment

5. Easy installation: small size, light weight, infrared optical rain gauge is non-mechanical non-contact measurement, no horizontal installation requirements, Installation is simple.

6. Measuring in motion: There are no mechanical parts inside, and rainfall can be measured while traveling, which has no effect on accuracy.

7. Tilt correction: The internal tilt sensor participates in the calculation, generates a correction coefficient, and corrects the rainfall.

8. Power consumption: low power consumption design, when there is no rainfall, the device is in a deep sleep state, and it will automatically activate when it rains.

9. Two kinds of signal output: RS485 signal output, long communication distance; pulse output, convenient collection.

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