Tipping Bucket Rain Gauge Error Detection via Sensor Fusion
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Solution Overview
Problem
Tipping bucket rain gauges face measurement errors due to inclination, clogging, mechanical locking, and vibrations, leading to delayed or undetected failures, especially in remote and hard-to-access locations, resulting in inaccurate rain data.
Innovation Solution
A microcontrolled electronic system with a capacitive sensor, pulse generator, and accelerometer is integrated into the rain gauge to detect errors and malfunctions, providing real-time data on water flow, tipping bucket movement, inclination, and vibrations, and enabling wireless communication for data collection and error reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tipping bucket rain gauge is installed in remote and hard-to-access locations, then it can collect rain data from representative areas, but measurement errors go undetected for months due to inability to perform inloco readings
Solution Approach 1:
The patent implements a feedback mechanism through electronic sensors that continuously monitor the tipping bucket mechanism's operation. The system provides real-time feedback on whether the bucket is properly tipping and generating pulses, allowing remote verification of measurement accuracy without requiring physical inspection. This resolves the contradiction by enabling reliability verification in hard-to-access locations.
Solution Approach 2:
The rain gauge performs self-diagnosis through integrated sensors that automatically detect and report malfunctions such as bearing failures or mechanical locking. The system monitors its own operation continuously and generates error signals when problems occur, eliminating the need for manual inloco readings to detect failures. This allows the device to serve itself in verifying measurement accuracy remotely.
2Ease of operation
If the rain gauge operates in open environments subject to weather, then it can collect natural rain data, but environmental factors cause measurement errors through vibrations and clogging
Solution Approach 1:
The patent employs preliminary action by implementing preventive monitoring mechanisms that detect early signs of environmental damage. The capacitive sensor monitors for clogging conditions before they affect measurements, and the accelerometer detects vibrations before they cause mechanical failure. This allows the system to take preventive measures or alert operators before environmental factors compromise measurement precision.
Solution Approach 2:
The system uses feedback from multiple sensors (capacitive sensor for clogging detection, accelerometer for vibration monitoring) to continuously assess environmental impacts. When abnormal conditions are detected, the system generates error signals that can trigger alerts or corrective actions, maintaining measurement precision despite the rain gauge's exposure to open environments.
3Ease of manufacture
If simple mechanical leveling means are used, then the device is easy to install, but inclination errors exceeding 20% occur and remain undetected for months
Solution Approach 1:
The patent replaces the purely mechanical spirit level with an electronic accelerometer-based inclination detection system. While the mechanical leveling means remain simple for installation, the electronic sensor continuously monitors inclination angles and generates error signals when the device is improperly leveled. This substitution maintains ease of installation while dramatically improving measurement precision through continuous electronic verification.
4Device complexity
If mechanical pulse generation is used to detect tipping bucket movement, then the system is simple in construction, but mechanical locking from external factors causes detection failures
Solution Approach 1:
The patent introduces an intermediary capacitive sensor that detects the tipping bucket's movement without relying on direct mechanical contact. The capacitive sensor measures changes in electrical capacitance as the bucket moves, providing pulse generation that is immune to mechanical locking from external factors like ant hills. This intermediary sensing method maintains simple construction while dramatically improving pulse detection reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly reduces measurement errors by promptly identifying and reporting issues related to clogging, mechanical failures, and environmental disturbances, ensuring more reliable and accurate rain data collection.
Implementation Method 1
a capacitive sensor (112), arranged in a region of the catchment funnel (111), capable of detecting the presence of water, and the flow of water through the catchment funnel (111)
Implementation Method 2
provides an accelerometer for measuring the inclination and vibration detection, all connected to a microcontroller
Implementation Method 3
a pulse generator device coupled in the central region after the tipping bucket, whose function is to measure its movement
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
"CONFIGURATION APPLIED IN A TIPPING BUCKET RAIN GAUGE AND ITS MICROCONTROLLED SYSTEM", comprised to a body containing a catchment funnel at the top and a base providing a tipping bucket with a dosage predetermined by the operator and comprising means to detect the tipping bucket movement, wherein include remote monitoring and identification of possible operating faults or defects in the rain gauge (100), such as jamming of the tipping bucket (121) or clogging of the catchment funnel(111), by reading data from the sensor(112) and the pulse generator (122), and also possible measurement errors caused by defects in the sensor (112) or in the pulse generator (122), or caused by inclination or vibration of the rain gauge (100). Such monitoring is due the capacitive sensor (112) arranged in order to detect the accumulation of water in the funnel (111) and the water flow; and due the pulse generator (122) arranged in order to measure the number of movements of the tipping bucket (121), including yet a control module (200) that communicates with the capacitive sensor (112) and with the pulse generator (122) of the tipping bucket (121), and with an accelerometer providing in the control module (200) itself.