Tipping Bucket Rain Gauge Field Calibration for Capacity Difference
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Solution Overview
Problem
Current methods for calibrating tipping bucket rain gauges are cumbersome, costly, and unable to provide accurate on-site assessments, leading to delayed detection of measurement errors and environmental impacts affecting accuracy.
Innovation Solution
A calibration system comprising a field calibration device with a water bottle, constant head adaptor, and placement frame, along with a detection communication box, allows for automated on-site assessment of capacity differences and environmental conditions, using an electronic device to calculate and suggest adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rain gauge is sent to calibration laboratories for periodic calibration, then the measurement accuracy can be maintained, but the detection time is delayed and the calibration capacity is limited
Solution Approach 1:
The patent extracts the calibration function from the centralized laboratory and relocates it to the field station through a portable calibration device. The device includes a calibration bucket, flow rate meter, and control unit that can be deployed at the rain gauge location, enabling on-site calibration without needing to send the rain gauge away. This extraction resolves the contradiction by maintaining measurement accuracy while eliminating the time loss associated with transportation and laboratory scheduling.
Solution Approach 2:
The calibration device enables the rain gauge system to perform self-calibration at its installed location. The portable device provides calibration water, measures flow rate, and allows on-site adjustment of the rain gauge's collection area or bucket capacity without external laboratory intervention. This self-service capability maintains measurement accuracy while eliminating the time delay of periodic laboratory calibration.
2Measurement precision
If traditional volumetric burette titration devices are used for field calibration, then capacity difference can be detected, but the device size is large and transport is inconvenient
Solution Approach 1:
The patent segments the traditional bulky burette titration system into modular components: a separate calibration bucket, a flow rate meter, and a control unit. This segmentation allows each component to be compact and easily transportable while maintaining the essential calibration function. The calibration bucket can be filled with water and positioned over the rain gauge collection funnel, with the flow rate measured by the meter and controlled by the unit, eliminating the need for a large integrated burette device.
3Measurement precision
If laboratory calibration is performed, then standard traceability is achieved, but the cost is high and the process is lengthy
Solution Approach 1:
The patent replaces the complex mechanical burette titration system with an automated electronic control system. The control unit electronically controls the calibration water flow, measures the flow rate through sensors, and calculates the capacity difference automatically. This substitution of mechanical measurement with electronic control and calculation significantly speeds up the calibration process while maintaining traceability through standardized measurement protocols and reference materials.
4Productivity
If the rain gauge is exposed to outdoor weather conditions, then it can perform continuous rainfall observation, but measurement accuracy is affected by environmental factors
Solution Approach 1:
The patent implements a feedback mechanism where the calibration device continuously monitors and adjusts for environmental factors affecting the rain gauge. The control unit measures actual flow rate, compares it with expected values, and calculates capacity difference in real-time. This feedback loop allows the system to detect and compensate for environmental influences such as wind, temperature, and humidity effects on water flow, maintaining measurement accuracy while enabling continuous outdoor observation.
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
Enables convenient, automated, and effective on-site calibration of tipping bucket rain gauges, ensuring accuracy and reliability, and providing immediate recommendations for handling.
Implementation Method 1
The constant head adaptor is installed at an open end of the water bottle. A needle that is replaceable is disposed at an outlet end of the constant head adaptor. When the water bottle and the constant head adaptor are invertedly disposed inside the collection funnel... the water contained in the water bottle is configured to flow out of the needle through the constant head adaptor at a predetermined flow rate
Implementation Method 2
The measurement sensor module is configured to correspondingly generate metering information when detecting an automatic tipping action of a plurality of buckets of the tipping bucket rain gauge
Implementation Method 3
The environmental condition sensor is configured to sense at least one environmental parameter of a temperature, a humidity, and an atmospheric pressure of an environment where the detection communication box is located
Implementation Method 4
The environmental condition sensor is configured to sense at least one environmental parameter of a temperature, a humidity, and an atmospheric pressure
Implementation Method 5
The environmental condition sensor is configured to sense at least one environmental parameter of a temperature, a humidity, and an atmospheric pressure
Implementation Method 6
The message transmission module is configured to transmit the metering information and the environmental information to the electronic device executing the application
Data Source
AI summary
A calibration system is configured to detect a capacity difference of a tipping bucket rain gauge and determine an operational condition of the tipping bucket rain gauge. The calibration system includes a field calibration device, a detection communication box, and an application. The application is executed by an electronic device, which, upon receiving metering information and environmental information transmitted by the detection communication box, can calculate the capacity difference of the tipping bucket rain gauge. The calibration system allows an operator to directly perform testing of the capacity difference and the operational condition of the tipping bucket rain gauge, so as to provide users with follow-up measures or suggestions.