Modulated Leak Detection Circuits for Building Moisture Sealing
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Solution Overview
Problem
Existing methods for locating leaks in moisture-proofing layers on buildings, such as flat roofs, are inefficient and prone to interference when using multiple leak detectors simultaneously, leading to prolonged testing times, especially on larger areas.
Innovation Solution
The use of multiple measuring circuits with individual test signals modulated to prevent interference, allowing each detector to operate independently with a unique measurement signal, and a modular structure that can be adapted based on the size of the area and number of detectors, ensuring only one circuit is active at a time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple leak detectors are used simultaneously on large roofs, then the time required to locate leaks is reduced, but mutual interference between measuring circuits occurs
Solution Approach 1:
The patent implements periodic action by sequentially activating different measuring circuits at different time intervals. Each detector is assigned a specific time window within a recurring test sequence, allowing multiple detectors to operate without mutual interference while maintaining measurement reliability and reducing overall detection time.
Solution Approach 2:
The system dynamically switches between different measuring circuits based on time-modulated control signals. The base unit activates detectors in a sequential manner, creating dynamic time-multiplexed operation that allows multiple detectors to share the same system resources without interference, thereby improving productivity while maintaining reliability.
2Reliability
If only one scanning conductor is used per roof, then measurement interference is avoided, but the testing process takes a lot of time on large areas
Solution Approach 1:
The patent resolves this contradiction by implementing periodic activation of multiple scanning conductors. Instead of using one detector continuously, multiple detectors are activated in sequential time windows within a recurring test sequence. This allows the system to maintain measurement accuracy (as if only one detector were used) while significantly reducing testing duration by utilizing multiple detectors simultaneously across different time slots.
Solution Approach 2:
The testing process is segmented into multiple time windows, with each time window assigned to a specific detector. This segmentation allows the roof area to be divided into multiple testing zones that can be evaluated in parallel by different detectors, reducing the overall testing time while maintaining the reliability of individual measurements.
3Productivity
If multiple measuring circuits are activated simultaneously, then leak detection coverage is improved, but measuring circuits influence each other
Solution Approach 1:
The patent eliminates mutual interference by implementing periodic activation where each measuring circuit is assigned a specific time window within a recurring test sequence. During its assigned time window, a detector is activated to provide full detection coverage for its designated period, while other detectors remain inactive. This temporal separation prevents harmful electromagnetic interference between circuits while maintaining comprehensive detection coverage across the entire roof area.
Solution Approach 2:
The base unit acts as an intermediary that controls and coordinates the activation of multiple detectors. It generates time-modulated control signals that sequentially activate different measuring circuits, preventing direct interference between them. The intermediary control system ensures that only one detector is active at any given moment while maintaining the appearance of simultaneous multi-detector operation through rapid sequential switching.
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
This approach significantly reduces the time required to locate leaks by eliminating mutual interference and allowing for efficient operation of multiple detectors without interference, particularly on large roofs exceeding 10,000 square meters.
Implementation Method 1
a modulation of the test signal being provided for generating a respective individual measurement signal
Implementation Method 2
The top of a flat roof is watered before a moisture penetration measurement is carried out and thus made conductive
Data Source
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AI summary
The arrangement has a base device (2) for producing a test signal in a measuring circuit (I). A mobile detector (3) closes the measuring circuit by a medium (M) e.g. water. A measuring signal is produced, where the signal depends on the displacement of the detector to the location of a leakage (L) so that an approximation or displacement to the searched leakage is signaled by a position change of the detector. Another measuring circuit (II) is attached with another detector (4) for detection of further leakage. The test signal is modulated for the production of individual measuring signals. An independent claim is also included for a method of detecting a leakage in moisture sealing layers.