Hydrant Sensor Time Offset Sync for Water Event Localization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Water distribution systems face challenges in accurately locating and diagnosing issues due to their large geographic size and complex propagation patterns, which are exacerbated by the difficulty in accessing sensors and maintaining synchronization of remote monitoring devices with external clock sources, leading to inefficiencies in identifying and addressing service disruptions.
Innovation Solution
The implementation of a hydrant-based monitoring apparatus with a local clock source, processor, and communication interface that wakes from low power mode to sensing and operational modes to associate sensor data with local and external clock times, determining offsets, and transmitting data to a central monitoring system for synchronized analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is used to transmit sensor data from remote monitoring devices, then the ability to monitor system operating parameters is improved, but clock synchronization accuracy deteriorates due to the large geographic size and difficulty in maintaining synchronization with external clock sources
Solution Approach 1:
The system divides the monitoring network into autonomous segments, where each remote monitoring device maintains its own local clock source independently. This segmentation allows each device to operate with high timing precision locally without being constrained by wireless communication delays or external clock source accessibility, thereby resolving the contradiction between monitoring reliability and clock synchronization accuracy.
Solution Approach 2:
The local clock source acts as an intermediary between the sensor data and the external monitoring system. Instead of relying directly on external clock sources that are difficult to access remotely, the local clock source provides a stable timing reference that mediates the synchronization problem, enabling accurate event timing to be recorded and transmitted later without real-time clock dependency.
2Measurement precision
If remote monitoring devices remain in operational mode continuously to maintain accurate clock synchronization, then clock synchronization accuracy is improved, but energy consumption increases
Solution Approach 1:
The remote monitoring device employs periodic action by transitioning between low power mode and operational mode. The local clock source continues to tick in low power mode, maintaining timekeeping functionality without full operational overhead. The device wakes to operational mode periodically to synchronize with external clock sources or transmit data, thereby achieving acceptable synchronization accuracy while dramatically reducing energy consumption compared to continuous operational mode.
3Measurement precision
If the sampling rate is increased to capture fast-propagating events accurately, then measurement precision is improved, but energy consumption increases due to frequent wake cycles from low power mode
Solution Approach 1:
The system extracts the timing function from the power-intensive operational mode and assigns it to the low-power local clock source. This allows the device to remain in low power mode for extended periods, waking only briefly to capture sensor data and associate it with the locally tracked time. The local clock source continues counting ticks independently, enabling high-resolution event timing without requiring the device to be fully operational at the moment of the event, thus reducing energy consumption while maintaining measurement precision.
Data Source
AI summary
A hydrant apparatus may be employed to monitor a water distribution system, and may include a sensor, a processor, and a local clock source. The apparatus may wake from a low power mode to a sensing mode, receive the sensor data, associate the sensor data with a first local clock time, and return the apparatus to the low power mode from the sensing mode. The apparatus may subsequently wake to an operational mode, determine a second local clock time subsequent to the first local clock time, associate an external clock time with the second local clock time, determine an offset for the received sensor data based on the first local clock time and the association between the second local clock time and the external clock time, and transmit the sensor data and the offset to an external monitoring system.