CN-224233679-U - Electromagnetic ultrasonic signal enhancement circuit

Abstract

The utility model provides an electromagnetic ultrasonic signal enhancement circuit which comprises an electromagnetic ultrasonic interface, a matching inductor, a base unit and a basic unit, wherein the base unit comprises a first matching capacitor, a first electromagnetic ultrasonic inductor, a first switching circuit and a second switching circuit, the basic unit comprises a second matching capacitor, a second electromagnetic ultrasonic inductor, a third switching circuit and a fourth switching circuit, the first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit all comprise two diodes with positive poles and negative poles connected, and the electronic components are electrically connected in sequence to form the electromagnetic ultrasonic signal enhancement circuit. According to the utility model, the series-parallel state of the coils is automatically switched by the on or off state of the diode, so that the amplitude of the transmitting current and the receiving sensitivity can be obviously improved, the cost is reduced, the response speed is improved, and the high-frequency excitation signal is more adapted.

Inventors

• PENG JUN
• YIN WENMING
• Ding Gongqin

Assignees

• 福建永荣科技有限公司

Dates

Publication Date

20260512

Application Date

20250529

Claims (6)

1. 1. The electromagnetic ultrasonic signal enhancement circuit is characterized by comprising an electromagnetic ultrasonic interface, a matching inductor, a base unit and a basic unit, wherein the base unit comprises a first matching capacitor, a first electromagnetic ultrasonic inductor, a first switching circuit and a second switching circuit, the basic unit comprises a second matching capacitor, a second electromagnetic ultrasonic inductor, a third switching circuit and a fourth switching circuit, and the first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit all comprise diodes with positive poles and negative poles connected; the electromagnetic ultrasonic interface, the first switch circuit, the first electromagnetic ultrasonic inductor and the second switch circuit are sequentially and electrically connected to form a loop, two ends of the first matching capacitor are connected in parallel with two ends of the first switch circuit connected with the first end of the electromagnetic ultrasonic interface, and the first end of the matching inductor is connected with the second end of the electromagnetic ultrasonic interface; The first end of the second electromagnetic ultrasonic inductor is electrically connected with the first end of the third switch circuit and the first end of the second matching capacitor, the second end of the second electromagnetic ultrasonic inductor is electrically connected with the first end of the fourth switch circuit and the second end of the matching inductor, the second end of the second matching capacitor is electrically connected with the second end of the fourth switch circuit, and the second end of the third switch circuit and the second end of the fourth switch circuit are respectively connected with two ends of the first electromagnetic ultrasonic inductor.
2. 2. The electromagnetic ultrasonic signal enhancement circuit according to claim 1, wherein the basic unit is provided with more than two basic units, a first basic unit is electrically connected with the basic unit, and a second end of a third switch circuit and a second end of a fourth switch circuit in a later basic unit are connected with two ends of a second electromagnetic ultrasonic inductor in a former basic unit; the second end of the matching inductance is only connected with the second end of the second electromagnetic ultrasonic inductance in the last basic unit.
3. 3. An electromagnetic ultrasonic signal enhancement circuit according to claim 2, wherein said base units are three.
4. 4. An electromagnetic ultrasonic signal enhancement circuit according to claim 2, wherein the matching inductance has an inductance value matching the number of base units connected.
5. 5. An electromagnetic ultrasonic signal enhancement circuit according to any of claims 1 to 4, wherein said diode is a PIN diode or a fast recovery diode.
6. 6. An electromagnetic ultrasonic signal enhancement circuit according to any of claims 2 to 4 and wherein said first electromagnetic ultrasonic inductor and said second electromagnetic ultrasonic inductor are electromagnetic ultrasonic coils, and wherein a plurality of electromagnetic ultrasonic coils are connected by a rigid PCB or a flexible PCB and are closely laminated and wound in the same direction.

Description

Electromagnetic ultrasonic signal enhancement circuit Technical Field The utility model relates to the technical field of electromagnetic ultrasonic detection, in particular to an electromagnetic ultrasonic signal enhancement circuit. Background In the current electromagnetic ultrasonic detection system, the signal enhancement circuit mainly adopts the following two schemes: (1) Single electromagnetic coil structure The transmitting end of the scheme is directly connected with the fixed impedance matching network, and the receiving end senses signals through the coil with fixed turns. However, in the transmitting stage, the transmitting current is limited due to the fixed impedance, so that the electromagnetic ultrasonic excitation energy is insufficient, and in the receiving stage, the induction voltage is only at a microvolts level due to the fixed coil equivalent turns, so that the signal-to-noise ratio is lower. (2) Multi-coil fixing serial-parallel connection structure The scheme switches the series-parallel state of the coils through a physical switch such as a relay, but requires an additional control circuit. However, the above solution has the problems that the response speed of the mechanical switch is low and the mechanical switch cannot adapt to the high-frequency excitation signal in the transmitting stage, and the noise is introduced by the contact resistance of the switch in the receiving stage, so that the signal quality is reduced. Meanwhile, the signal strength cannot be improved through modularized expansion in the two schemes, and hardware needs to be redesigned. Accordingly, the prior art signal enhancement circuit remains to be improved. Disclosure of utility model In order to solve the problems in the prior art, the utility model provides an electromagnetic ultrasonic signal enhancement circuit which can remarkably improve the amplitude of a transmitting current and the receiving sensitivity. In order to achieve the above purpose, the utility model adopts the following technical scheme: In a first aspect, the utility model provides an electromagnetic ultrasonic signal enhancement circuit, which comprises an electromagnetic ultrasonic interface, a matching inductance, a base unit and a base unit, wherein the base unit comprises a first matching capacitor, a first electromagnetic ultrasonic inductance, a first switching circuit and a second switching circuit, the base unit comprises a second matching capacitor, a second electromagnetic ultrasonic inductance, a third switching circuit and a fourth switching circuit, and the first switching circuit, the second switching circuit, the third switching circuit and the fourth switching circuit all comprise two diodes with positive poles and negative poles connected; the electromagnetic ultrasonic interface, the first switch circuit, the first electromagnetic ultrasonic inductor and the second switch circuit are sequentially and electrically connected to form a loop, two ends of the first matching capacitor are connected in parallel with two ends of the first switch circuit connected with the first end of the electromagnetic ultrasonic interface, and the first end of the matching inductor is connected with the second end of the electromagnetic ultrasonic interface; The first end of the second electromagnetic ultrasonic inductor is electrically connected with the first end of the third switch circuit and the first end of the second matching capacitor, the second end of the second electromagnetic ultrasonic inductor is electrically connected with the first end of the fourth switch circuit and the second end of the matching inductor, the second end of the second matching capacitor is electrically connected with the second end of the fourth switch circuit, and the second end of the third switch circuit and the second end of the fourth switch circuit are respectively connected with two ends of the first electromagnetic ultrasonic inductor. The utility model has the advantages that the serial-parallel state of the coils is automatically switched through the connection or disconnection of the diode, when the ultrasonic wave is transmitted, the electromagnetic ultrasonic interface inputs high-frequency high-voltage pulse, the diode is connected, the first electromagnetic ultrasonic inductor and the second electromagnetic ultrasonic inductor are in a parallel state, the total impedance is reduced, the excitation current is greatly improved, when the ultrasonic wave is received, the electromagnetic ultrasonic interface receives micro-volt voltage, the diode is disconnected, the signals form an end-to-end serial path through capacitive coupling, the equivalent turns of the coils are increased, the received ultrasonic signals are linearly overlapped, the induction voltage is greatly improved, the signal-to-noise ratio is greatly improved, and therefore, the amplitude of the transmission current and the receiving sensitivity can be remarkably improved. Mean