High-Frequency Signal Detection for Spray Mist Monitoring
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Solution Overview
Problem
Existing methods for monitoring the functioning of spray heads in process containers are unreliable due to interference from general process noise and require multiple expensive measuring devices, which can lead to space issues.
Innovation Solution
A method using a high-frequency measuring device to detect spray mist by transmitting and receiving high-frequency signals, determining characteristic variables from the reception signal, and detecting spray mist based on predefined reference values, utilizing existing radar or ultrasonic fill-level measuring devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic measuring devices are used to monitor spray head functionality, then spray mist detection is possible, but reliability deteriorates due to interference from general process noise
Solution Approach 1:
The patent replaces acoustic measuring devices with a high-frequency measuring device that transmits and receives high-frequency signals (radar or ultrasound). This substitution eliminates susceptibility to acoustic process noise from pumps, agitators, and fluid flows, as the high-frequency electromagnetic or ultrasonic signals are not affected by these mechanical disturbances.
Solution Approach 2:
The patent changes the measurement parameter from acoustic frequency to high-frequency signal characteristics (amplitude, phase, or time of flight). By monitoring changes in these high-frequency signal parameters when spray mist is present, the system achieves reliable detection without being affected by low-frequency process noise.
2Measurement precision
If multiple acoustic measuring devices are installed per spray head to ensure sufficient sensitivity, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent makes the high-frequency measuring device multi-functional by enabling it to perform both fill-level measurement and spray mist detection simultaneously. The same device that monitors the liquid level in the container also detects the presence of spray mist through signal characteristic analysis, eliminating the need for separate dedicated spray monitoring devices.
Solution Approach 2:
The patent merges the fill-level measurement function and spray mist detection function into a single integrated high-frequency measuring device. By combining these functions, the system reduces the total number of devices required while maintaining measurement precision through the use of high-frequency signals that provide both depth information and mist detection capability.
3Measurement precision
If multiple measuring devices are installed per spray head, then measurement precision improves, but installation space requirements increase
Solution Approach 1:
The high-frequency measuring device is designed to serve multiple functions within a single installation point. It simultaneously performs fill-level measurement and spray mist detection, eliminating the need for multiple separate devices that would require additional installation space around each spray head.
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 method allows for reliable monitoring of spray head functionality with minimal measuring effort, eliminating the need for multiple measuring devices and reducing interference from process noise.
Implementation Method 1
receiving a reception signal after the transmitted high-frequency signal is reflected in the container
Implementation Method 2
If the high-frequency or fill-level measuring device is designed as a radar-based measuring device, it is again irrelevant whether the signal generation unit is designed to transmit the high-frequency signal by means of the pulse transit time method or the FMCW method
Implementation Method 3
In the context of the invention, the term 'high frequency' is defined either as radar or as ultrasound with frequencies between 20 kHz and 300 GHz
Data Source
AI summary
The detection of spray mist in containers and the associated checking of the functioning of the corresponding spray head by a high-frequency measuring device includes transmitting a high-frequency signal into the container and receiving a corresponding reception signal after reflection in the container. A defined characteristic variable that can be assigned to the spray mist is determined on the basis of the reception signal. The presence of spray mist is detected if the determined characteristic variable corresponds to a predefined reference value. To use this as the basis to detect the functionality of the spray head, it is additionally necessary to control or detect the activation and deactivation of the spray head. This allows the spray head to be classified as functional if it is switched on, and the high-frequency measuring device detects the spray mist.