Time-Reversal Microwave Calibration for Energy-Focused Heating
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Solution Overview
Problem
The existing microwave heating technology faces inefficiencies in energy utilization and distribution, leading to unsatisfactory heating efficiency and potential abnormal phenomena such as sparking and melting, particularly in chemical engineering applications.
Innovation Solution
A method and device utilizing time reversal calibration technology with a signal generator and microwave transceivers to emit focused microwave power signals based on beacon signals, adjusting phase and amplitude to maintain heating focus on the material, and cyclically adjusting signals to meet temperature presets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microwave heating is used in a finite enclosed space, then the heating process can be performed, but the microwave energy cannot be effectively focused on the heated material, causing unsatisfactory heating efficiency and energy utilization rate
Solution Approach 1:
The patent applies time reversal calibration technology, which inverts the conventional microwave heating approach. Instead of transmitting microwave signals from multiple sources simultaneously and hoping for focusing, the system first transmits calibration signals to measure the electromagnetic field distribution, then uses this information to calculate and adjust the phase and amplitude of heating signals so that they converge precisely on the target material. This inversion of the problem-solving approach enables effective focusing of microwave energy in a finite enclosed space.
Solution Approach 2:
The patent implements a feedback control mechanism where calibration signals are transmitted first to measure the actual electromagnetic field distribution in the heating cavity. The measured information is then used to adjust the heating signal parameters (phase and amplitude) for each transmitter. This closed-loop feedback ensures that the microwave energy is effectively focused on the heated material, resolving the contradiction between heating efficiency and energy utilization rate.
2Productivity
If microwave heating is performed in a finite enclosed space with multiple distribution modes, then the heating process can be completed, but abnormal phenomena such as sparking and melting occur
Solution Approach 1:
The patent applies local quality control by individually adjusting the phase and amplitude parameters for each microwave transmitter based on the measured electromagnetic field distribution at its specific location. This localized optimization ensures that each transmitter contributes constructively to the overall heating process, preventing localized energy concentration that would cause sparking and melting, while still achieving complete heating of the target material.
Solution Approach 2:
The patent changes the parameters (phase and amplitude) of the microwave signals dynamically based on the measured calibration results. By adjusting these parameters for each transmitter according to the specific electromagnetic field conditions in different regions of the heating cavity, the system avoids abnormal phenomena like sparking and melting while ensuring complete heating.
3Stability of the object's composition
If multiple microwave transceivers are used to improve heating coverage, then the heating uniformity improves, but the device complexity increases
Solution Approach 1:
The patent makes each microwave transceiver multi-functional by using them both for transmitting calibration signals and for transmitting heating signals. The same hardware components perform multiple functions, reducing the need for separate calibration devices and simplifying the overall system architecture while still achieving uniform heating through coordinated operation of multiple transceivers.
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
Enhances microwave heating efficiency and energy utilization by maintaining focused electromagnetic fields on the material, improving temperature control and reducing abnormal events.
Implementation Method 1
The microwave heating process is a process that a heated material placed in a high-frequency electromagnetic field absorbs microwave energy and converts into thermal energy
Implementation Method 2
a heated material placed in a high-frequency electromagnetic field absorbs microwave energy and converts into thermal energy
Implementation Method 3
controlling the microwave transceivers to emit microwave power signals according to the received beacon microwave signal, wherein the microwave power signals are focused on the placement position for heating the material to be heated
Data Source
AI summary
The accurate microwave heating method and device based on the time reversal calibration technology are provided. The heating method is applied in the heating device having a signal generator and multiple microwave transceivers, including steps of: placing a material to be heated into the heating device, wherein the signal generator is arranged at a placement position of the material to be heated; according to the placement position of the material to be heated in the heating device, controlling the signal generator to emit a beacon microwave signal; controlling the microwave transceivers to emit microwave power signals according to the received beacon microwave signal; during heating, when a preset trigger condition is detected to be triggered and a current temperature of the material to be heated does not meet a preset temperature, repeating emitting the first and microwave power signals until meeting the preset temperature, and then stopping working.