An electro-optical-acoustic-triboelectric coupled signal transmission device

Abstract

The present invention discloses an electro-optical-acoustic-triboelectric coupled signal transmission device. The present invention proposes a laser ultrasonic transducer to which third-phase particles are added to increase acoustic impedance. The laser ultrasonic transducer is used to replace the piezoelectric ultrasonic transducer used for signal transmission. Laser excitation of ultrasonic signals is used, and a triboelectric device comprising a sponge matrix, a metal film, and a filler is used to replace the piezoelectric ultrasonic transducer used for signal reception to convert the ultrasonic signals into electrical signals. Compared with traditional electro-acoustic-electric coupled signal transmission devices based on piezoelectric ultrasonic transducers, this device does not require cables and can achieve long-distance wireless signal transmission across metals.

Description

Technical Field

[0001] The present invention relates to an electric-optical-acoustic-triboelectric coupled signal transmission device, belonging to the technical field of communications. Background Art

[0002] Thick-walled, sealed metal cavities are a typical example of specialized defense and industrial equipment. They safely isolate the high-temperature, high-pressure, and even highly explosive and radioactive environments within the cavity from the outside world. In practice, to maintain the mechanical strength of such equipment, it is often desirable to minimize openings within the cavity. This makes real-time monitoring of the cavity's internal conditions extremely difficult using conventional techniques.

[0003] Wireless monitoring has long relied on electromagnetic waves as a carrier for signal transmission, but enclosed metal cavities shield electromagnetic waves. Metal, on the other hand, is an excellent transmission medium for ultrasonic waves. Low-power ultrasonic waves can propagate up to several meters through metal, making the use of ultrasonic waves as a carrier for wireless signal transmission across thick metal walls highly valuable.

[0004] When ultrasound waves pass from air into a metal medium, they are strongly reflected at the air / metal interface due to the mismatch between the acoustic impedances of air and metal, which can differ by several orders of magnitude. Similarly, when ultrasound waves pass from metal into air, they are also strongly reflected at the interface. In wireless ultrasonic signal transmission systems across metal, to prevent degradation of communication quality due to reflections at the air / metal interface, the ultrasonic transducers for both signal transmission and reception must be in close contact with the metal wall. Due to their compact size and ease of use, piezoelectric structures (piezoelectric ultrasonic transducers) are typically used for ultrasonic transducers. However, these transducers require a cable to connect to the controller, and this cable constraint introduces numerous inconveniences to wireless signal transmission across metal. Summary of the Invention

[0005] The present invention provides an electric-optical-acoustic-triboelectric coupled signal transmission device, which solves the problems disclosed in the background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An electric-optical-acoustic-triboelectric coupled signal transmission device, comprising a laser ultrasonic transducer and a triboelectric device arranged on both sides of a metal medium;

[0008] The laser ultrasonic transducer includes a first substrate and second-phase particles disposed on the first substrate. The second-phase particles absorb periodic laser pulses and convert the periodic laser pulses into periodic thermal energy. The first substrate expands and contracts under the action of the periodic thermal energy, generating ultrasonic signals.

[0009] The triboelectric device includes a second substrate with several holes. The inner walls of the holes are plated with a metal film, and the holes are filled with a filler. Under the action of the ultrasonic signal, the second substrate and the filler are squeezed and pulled against each other, causing the charge density at any position of the metal film to undergo corresponding dynamic changes and generate an electrical signal.

[0010] The first substrate is provided with third-phase particles for increasing the acoustic impedance of the laser ultrasonic transducer.

[0011] The third phase particles are metal particles with a particle size of 5-200000 nanometers, and the atomic weight of the elements with a mass content greater than 50% among the constituent elements is not less than 50.

[0012] The first matrix is ​​a polydimethylsiloxane matrix.

[0013] The second phase particles are carbon-based nanoparticles with a particle size of 5-200 nanometers, and the mass content of carbon elements in the constituent elements is greater than 50%.

[0014] The second matrix is ​​an insulating polymer matrix and has a porous structure with a porosity greater than 50%.

[0015] The filler is an insulating polymer filler.

[0016] The thickness of the metal film is 10-5000 nanometers.

[0017] It also includes a signal source, a channel encoder, a digital modulator, a laser, a signal amplifier and filter, a digital demodulator, a channel decoder and a signal sink. The signal source, channel encoder, digital modulator and laser are connected in sequence. The laser emits laser light to the laser ultrasonic transducer. The signal amplifier and filter, digital demodulator, channel decoder and the signal sink are connected in sequence. The input end of the signal amplifier and filter inputs the electrical signal output by the triboelectric device.

[0018] The beneficial effects achieved by the present invention are as follows: the present invention uses a laser ultrasonic transducer to replace the piezoelectric ultrasonic transducer used for signal transmission, utilizes laser to excite ultrasonic signals, and uses a triboelectric device to replace the piezoelectric ultrasonic transducer used for signal reception to convert ultrasonic signals into electrical signals. Compared with traditional piezoelectric ultrasonic transducers, no cables are required, and long-distance wireless signal transmission across metals can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a signal transmission device;

[0020] Figure 2 is a schematic diagram of a laser ultrasonic transducer;

[0021] Figure 3 Schematic diagram of a triboelectric device;

[0022] Figure 4 is a top view of a triboelectric device unit;

[0023] Figure 5 Schematic diagram of generating electrical signals for triboelectric devices. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] like Figure 1 As shown, an electro-optical-acoustic-triboelectric coupled signal transmission device includes a signal source, a channel encoder, a digital modulator, a laser, a laser ultrasonic transducer 1, a triboelectric device 2, a signal amplifier and filter, a digital demodulator, a channel decoder and a signal sink.

[0026] The signal source, channel encoder, digital modulator, and laser are connected in sequence, and the laser emits laser light toward the laser ultrasonic transducer 1. The electrical signal from the signal source passes through the channel encoder and digital modulator before entering the laser, modulating the laser pulses. The modulated pulsed laser then illuminates the laser ultrasonic transducer 1 from a distance. The entire process is an electro-optical conversion process, converting the code elements of the electrical signal into specific parameter values ​​for the pulsed laser, thereby achieving digital modulation of the pulsed laser. These specific parameter values ​​include, but are not limited to, laser pulse intensity, pulse width, pulse frequency, and pulse position.

[0027] The laser ultrasonic transducer 1 and the triboelectric device 2 are respectively placed closely on both sides of the metal medium 3, that is, closely on the surface of the stainless steel metal wall. Figure 2 As shown, the laser ultrasonic transducer 1 includes a first matrix 11 and second-phase particles 12 and third-phase particles 13 distributed on the first matrix 11. The second-phase particles 12 absorb periodic laser pulses and convert them into periodic thermal energy. Under the action of the periodic thermal energy, the first matrix 11 expands and contracts, generating ultrasonic signals. The third-phase particles 13 are used to increase the acoustic impedance of the laser ultrasonic transducer 1.

[0028] The first matrix 11 is a polydimethylsiloxane (PDMS) matrix. The second-phase particles 12 are carbon-based nanoparticles, specifically carbon black nanoparticles, with a particle size of 5-200 nanometers and a carbon content of more than 50% by mass in the constituent elements. The particles are responsible for absorbing laser light and performing light-to-heat conversion. The third-phase particles 13 are metal particles with a particle size of 5-200,000 nanometers and an atomic weight of not less than 50 for elements with a mass content greater than 50%. The particles are specifically tungsten metal particles with a particle size of 200-2000 nanometers. Since the acoustic impedance of tungsten is more than twice that of stainless steel, the added tungsten metal particles increase the acoustic impedance of the laser ultrasonic transducer 1, thereby reducing the acoustic impedance mismatch between the laser ultrasonic transducer 1 and the stainless steel metal wall, and further reducing the reflection of ultrasonic waves at the laser ultrasonic transducer 1 / stainless steel metal wall interface.

[0029] The laser ultrasonic transducer 1 implements an electro-optical-acoustic conversion process, which is based on the photoacoustic effect. The modulated pulse laser is used to illuminate the laser ultrasonic transducer 1 from a distance to stimulate ultrasonic waves. At the same time, the modulation information carried by the pulse laser is converted into modulation information in the form of ultrasonic waves.

[0030] like Figure 4 As shown, the triboelectric device 2 includes a second substrate 21, which is provided with a plurality of holes. The inner walls of the holes are plated with a metal film 22, and the holes are filled with a filler 23. The second substrate 21 and the filler 23 are squeezed and pulled against each other under the action of the ultrasonic signal, causing the charge density at any position of the metal film 22 to undergo corresponding dynamic changes to generate an electrical signal.

[0031] The second matrix 21 is an insulating polymer matrix, which is a porous structure with a porosity greater than 50%, specifically a sponge matrix, and the material component is silicone rubber; the material component of the metal film 22 is copper, with a thickness of 10-5000 nanometers, preferably a thickness of 50-1000 nanometers; the filler 23 is an insulating polymer filler, specifically a polydimethylsiloxane filler.

[0032] The triboelectric device 2 absorbs the ultrasonic signal, and the sponge matrix and the filler 23 are squeezed and pulled against each other under the action of the pressure wave generated by the ultrasonic wave, which causes the mass of the filler 23 and the sponge matrix at any position of the metal film 22 to change dynamically, and then causes the charge density at any position of the metal film 22 to change dynamically accordingly, thereby realizing the external output of electrical energy and electrical signals.

[0033] like Figure 5The process of the triboelectric device 2 absorbing ultrasonic waves and outputting electrical energy and electrical signals to the outside is equivalent to the process of the single-electrode mode triboelectric nanogenerator outputting electrical energy to the outside, the metal film 22 is equivalent to the electrode of the single-electrode mode triboelectric nanogenerator, the increase in the mass of the filler 23 and the sponge matrix at any position of the metal film 22 is equivalent to the friction pair materials approaching each other, and the decrease in the mass of the filler 23 and the sponge matrix at any position of the metal film 22 is equivalent to the friction pair materials moving away from each other.

[0034] The triboelectric device 2 realizes an acoustic-electric conversion process, in which the triboelectric device 2 converts the received ultrasonic energy into electrical energy based on the triboelectric effect, and at the same time converts the modulation information carried by the ultrasonic wave into modulation information of the electrical signal.

[0035] Finally, the electrical signal output by the triboelectric device 2 is sent to the destination after passing through the signal amplifier and filter, digital demodulator and channel decoder.

[0036] The present invention uses a laser ultrasonic transducer 1 to replace the piezoelectric ultrasonic transducer used for signal transmission, utilizes laser to excite ultrasonic signals, and uses a triboelectric device 2 to replace the piezoelectric ultrasonic transducer used for signal reception to convert ultrasonic signals into electrical signals. Compared with traditional piezoelectric ultrasonic transducers, no cables are required, and long-distance wireless signal transmission across metals can be achieved.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electro-optical-acoustic-triboelectric coupling signal transmission device, characterized in that: It includes a laser ultrasonic transducer and a triboelectric device arranged on both sides of a metal medium; The laser ultrasonic transducer includes a first substrate and second-phase particles disposed on the first substrate. The second-phase particles absorb periodic laser pulses and convert the periodic laser pulses into periodic thermal energy. The first substrate expands and contracts under the action of the periodic thermal energy, generating ultrasonic signals. The triboelectric device includes a second substrate with several holes. The inner walls of the holes are plated with a metal film, and the holes are filled with a filler. Under the action of the ultrasonic signal, the second substrate and the filler are squeezed and pulled against each other, causing the charge density at any position of the metal film to undergo corresponding dynamic changes and generate an electrical signal.

2. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 1, characterized in that: The first substrate is provided with third-phase particles for increasing the acoustic impedance of the laser ultrasonic transducer.

3. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 2, characterized in that: The third phase particles are metal particles with a particle size of 5-200000 nanometers, and the atomic weight of the elements with a mass content greater than 50% among the constituent elements is not less than 50.

4. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 1 or 2, characterized in that: The first matrix is ​​a polydimethylsiloxane matrix.

5. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 1 or 2, characterized in that: The second phase particles are carbon-based nanoparticles with a particle size of 5-200 nanometers, and the mass content of carbon elements in the constituent elements is greater than 50%.

6. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 1, characterized in that: The second matrix is ​​an insulating polymer matrix and has a porous structure with a porosity greater than 50%.

7. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 1, characterized in that: The filler is an insulating polymer filler.

8. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 1, characterized in that: The thickness of the metal film is 10-5000 nanometers.

9. The electro-optical-acoustic-triboelectric coupling signal transmission device according to claim 1, characterized in that: It also includes a signal source, a channel encoder, a digital modulator, a laser, a signal amplifier and filter, a digital demodulator, a channel decoder and a signal sink. The signal source, channel encoder, digital modulator and laser are connected in sequence. The laser emits laser light to the laser ultrasonic transducer. The signal amplifier and filter, digital demodulator, channel decoder and the signal sink are connected in sequence. The input end of the signal amplifier and filter inputs the electrical signal output by the triboelectric device.

Images