Thermoacoustic Transducer Switching for RF Artifact Suppression
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Solution Overview
Problem
Thermoacoustic imaging systems face interference from radio-frequency (RF) energy pulses, which directly affect piezoelectric elements and result in false data artifacts, hindering the acquisition of accurate thermoacoustic signals.
Innovation Solution
A thermoacoustic transducer with an integrated switch and impedance network that connects and disconnects the potential and ground electrodes in synchronization with RF emitter pulses, shunting RF-induced noise into impedance during emission and allowing signal reception during emission cessation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piezoelectric element is continuously connected to the data acquisition system, then the transducer can receive thermoacoustic signals, but RF energy pulses directly affect the piezoelectric element creating false thermoacoustic data artifacts
Solution Approach 1:
The switch is activated in advance before each RF pulse is emitted, establishing a protective electrical connection that shunts RF-induced currents away from the piezoelectric element before the harmful RF energy arrives, thereby preventing artifact generation at the source
Solution Approach 2:
An intermediary switching mechanism is introduced between the piezoelectric element and the data acquisition system. This switch acts as a mediator that selectively connects or disconnects the piezoelectric element based on the RF pulse timing, controlled by a timer that synchronizes with the RF emitter pulse schedule
2Object-affected harmful factors
If the piezoelectric element is disconnected during RF emission, then RF-induced artifacts are reduced, but the system cannot simultaneously receive thermoacoustic signals generated by RF pulses
Solution Approach 1:
The switch operates periodically in synchronization with the RF pulse emission cycle. It disconnects the piezoelectric element during RF pulse emission to prevent artifacts, then reconnects it during the intervals between pulses to allow thermoacoustic signal reception, creating a rhythmic on-off pattern that coordinates with the RF pulse timing
Solution Approach 2:
The switch is activated in advance before each RF pulse is emitted, establishing a protective electrical connection that shunts RF-induced currents away from the piezoelectric element before the harmful RF energy arrives, thereby preventing artifact generation at the source
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 configuration significantly reduces RF-induced artifacts by actively managing the electrical connection of the transducer elements, enhancing the quality of thermoacoustic data received during imaging.
Implementation Method 1
The received thermoacoustic signals in turn vibrate the piezoelectric element(s) of the thermoacoustic transducer causing the piezoelectric element(s) to convert the vibrations into an electrical potential
Implementation Method 2
the potential electrode and the ground electrode are electrically connected through an impedance when the switch is in an active state
Data Source
AI summary
A thermoacoustic transducer integrating at least one piezoelectric element having a first surface and a second surface, a potential electrode that is electrically connected to the second surface, a ground electrode that is electrically connected to the first surface, a switch electrically connected to both the potential electrode and the ground electrode, a timer configured to match a pulse emanating from a radio-frequency emitter, further wherein the potential electrode and the ground electrode are electrically connected through an impedance when the switch is in an active state, further wherein the potential electrode and the ground electrode are not electrically connected when the switch is in an inactive state; and a housing accommodating the at least one piezoelectric element, potential electrode, ground electrode, and switch.