Gapless condition photoacoustic signal transmission system and transmission method based on microcavity resonator

Abstract

The invention discloses a gapless condition photoacoustic signal transmission system and transmission method based on a microcavity resonator. The transmission system comprises a sound signal amplification and emission device used for converting and transmitting optical signals, and a sound receiving and sound-light conversion device used for receiving the sound signals and converting the sound signals containing transmission information into optical signals again for transmission. The sound signal amplifying and transmitting device and the sound receiving and sound-light conversion device are respectively arranged on two sides of the gapless transmission medium; the sound signal amplification and emission device comprises a microwave resonance assembly and a sound wave amplifier, the microwave resonance assembly can significantly enhance the interaction between light waves and a medium, the conversion efficiency of photoacoustic signals is greatly improved, the light waves in a microcavity can be stronger coupled with the medium in a small space, and the detection accuracy of the photoacoustic signals is improved. Therefore, photoacoustic signals are effectively amplified, the problem of low efficiency caused by energy loss in a traditional system is reduced, stable signal transmission under the gapless condition is achieved, and the problem that traditional optical fiber transmission is limited is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of signal transmission, and in particular to a gapless photoacoustic signal transmission system and a transmission method based on a microcavity resonator. Background Art

[0002] In traditional signal transmission systems, optical fiber communication technology is widely used for long-distance high-speed data transmission. As an efficient communication medium, optical fiber can transmit optical signals with extremely low attenuation and high bandwidth, and has become the core of modern communication networks. However, in some extreme environments, the use of optical fiber faces many difficulties. For example, in geological or physical environments such as underground rock formations, seabeds or deep space, optical fiber communication cannot be directly laid or operated stably due to space limitations, unsuitable media or other physical obstacles (such as rocks, metal layers, etc.). In addition, the transmission path of optical fiber is affected by the physical properties of the medium, especially in hard materials such as rocks and underground tunnels. The deployment of optical fiber is significantly restricted, and even in some extreme environments, it may not be able to penetrate obstacles, resulting in the inability of signals to continue to be effectively transmitted. In these scenarios, traditional optical signal transmission technology often cannot meet the transmission requirements of signals.

[0003] The photoacoustic effect is an important physical phenomenon, which refers to the process of generating sound waves after the interaction between light waves and matter. This effect is widely used in imaging, sensors, environmental monitoring and other fields. Traditional photoacoustic signal transmission systems have certain limitations in practical applications, especially in the process of signal amplification and transmission. Traditional systems often rely on the coupling of light waves and media to achieve the conversion of photoacoustic signals, but due to the low coupling efficiency between light waves and media and the large energy loss of signals during transmission, the signal amplification efficiency is low, and the signal quality will also drop significantly during long-distance transmission. Especially in underground environments, photoacoustic signals need to pass through complex media such as rock gaps, and the limitations of signal attenuation and transmission distance are more significant. Summary of the invention

[0004] Technical purpose: In view of the shortcomings of existing optical fiber signal transmission methods, the present invention discloses a gapless photoacoustic signal transmission system and transmission method based on a microcavity resonator.

[0005] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: A gapless photoacoustic signal transmission system based on a microcavity resonator comprises an acoustic signal amplifying and transmitting device for converting and transmitting an optical signal and an acoustic receiving and acoustic-optical conversion device for receiving an acoustic signal and converting the acoustic signal containing transmission information back into an optical signal for transmission. The acoustic signal amplifying and transmitting device and the acoustic receiving and acoustic-optical conversion device are arranged on both sides of a gapless transmission medium. The acoustic signal amplifying and transmitting device comprises a microwave resonance component and an acoustic wave amplifier. The acoustic wave amplifier is arranged at the acoustic wave output end of the microwave resonance component, and an optical lens group for assisting the transmission of the optical signal is arranged at the optical signal input end of the microwave resonance component.

[0006] Preferably, the microwave resonance component of the present invention includes a microwave resonance cavity, in which an absorption medium and a photoacoustic cell are arranged, the light signal is converted into an acoustic signal by the absorption medium, and the converted acoustic signal is amplified by the photoacoustic cell and transmitted to the acoustic wave amplifier.

[0007] Preferably, carbon nanotubes are arranged in the absorption medium of the present invention.

[0008] Preferably, the optical lens assembly of the present invention includes a filter, a prism reflector and a focusing lens which are sequentially arranged on a movable base along the light path direction. The carrier wavelength of the optical signal transmission is controlled by the filter, and the propagation direction of the modulated optical signal is changed by the prism reflector. The light beam is converged by the focusing lens and enters the microwave resonance component.

[0009] Preferably, the sound receiving and sound-to-light conversion device of the present invention comprises a sound signal receiving component, a sound signal filtering and processing component and a sound-to-light conversion component, wherein the sound signal filtering and processing component comprises a filter, a dynamic range compressor and a digital signal processor which are arranged in sequence.

[0010] Preferably, the acousto-optic conversion component of the present invention includes a driving power supply, a laser, a transducer, an acousto-optic medium, a coupling medium, an optical probe and an optical fiber. The transducer is electrically connected to the driving power supply, and the coupling medium is arranged between the transducer and the acousto-optic medium. The sound waves generated by the transducer modulate the laser emitted by the laser through the acousto-optic medium to generate an optical signal with transmission information, and the optical signal is received by the arranged optical probe, and the signal is transmitted through the optical fiber connected to the optical probe.

[0011] Preferably, the sound signal receiving component of the present invention comprises a loudspeaker, and a microphone and a piezoelectric sensor disposed in the loudspeaker, and the microphone and the piezoelectric sensor are used to detect and receive low-frequency and high-frequency sound waves respectively.

[0012] Preferably, the present invention provides a sound signal proofreading device for identifying and proofreading sound signals on the side where the sound receiving and sound-to-light conversion device is located. The sound signal proofreading device includes a sound signal receiving component consistent with the sound receiving and sound-to-light conversion device, a sound signal filtering and processing component, and a calibration component for extracting features of the sound signal and comparing them with pre-stored standard template features. The sound signal proofreading device is used to determine the sound wave containing the transmission information, and assist the sound receiving and sound-to-light conversion device in identifying and converting the sound wave.

[0013] The present invention discloses a gapless photoacoustic signal transmission method based on a microcavity resonator. Using the above-mentioned gapless photoacoustic signal transmission system, a light signal with transmission information enters a microwave resonance component under the transmission of an optical mirror group in a gapless environment, the light signal is converted into a sound signal by the microwave resonance component, and is amplified by a sound wave amplifier and transmitted to the other side of the gapless environment in the form of a sound wave, and the sound signal with transmission information is received by a sound receiving and sound-to-light conversion device and converted again into a light signal for transmission.

[0014] Preferably, when the present invention performs conversion between optical signals and acoustic signals, the optical signal is first amplified by the microwave resonant cavity of the microwave resonant component, and then photoacoustic conversion is performed by the absorbing medium. The converted acoustic signal is amplified by the photoacoustic cell and then enters the acoustic wave amplifier; when the acoustic receiving and acoustic-optical conversion device performs the acoustic-optical conversion, the received acoustic signal is first identified and proofread by the set acoustic signal proofreading device to confirm the acoustic signal that needs to be converted.

[0015] Beneficial effects: The present invention discloses a gapless photoacoustic signal transmission system and transmission method based on a microcavity resonator, which can significantly enhance the interaction between light waves and the medium by using microwave resonance components, greatly improve the conversion efficiency of photoacoustic signals, and enable the light waves in the microcavity to be more strongly coupled with the medium in a smaller space, thereby effectively amplifying the photoacoustic signal and reducing the inefficiency caused by energy loss in traditional systems, thereby achieving stable signal transmission under gapless conditions and overcoming the limitations of traditional optical fiber transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 It is a structural diagram of the acoustic signal amplifying and transmitting device of the present invention; Figure 2 It is a structural diagram of the sound receiving and sound-to-light conversion device of the present invention; Among them, 1-acoustic wave amplifier, 2-microwave resonant cavity, 3-absorption medium, 4-photoacoustic cell, 5-carbon nanotube, 6-filter, 7-prism reflector, 8-focusing lens, 9-filter, 10-dynamic range compressor, 11-digital signal processor, 12-driving power supply, 13-laser, 14-transducer, 15-acoustic-optical medium, 16-coupling medium, 17-optical probe, 18-optical fiber, 19-loudspeaker, 20-microphone, 21-piezoelectric sensor, 22-light source, 23-optical signal modulator, 24-oscilloscope, 25-display screen, 26-signal receiver, 27-controller, 28-acoustic wave processing device. DETAILED DESCRIPTION

[0018] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by way of explanation of the apparatus, composition and materials of the present disclosure, rather than limitation. On the contrary, the following description provides a convenient illustration of an exemplary embodiment for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations may be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0019] like Figure 1 and Figure 2 As shown, the present invention discloses a gapless photoacoustic signal transmission system based on a microcavity resonator, comprising an acoustic signal amplifying and transmitting device for converting and transmitting an optical signal and an acoustic receiving and acoustic-optical conversion device for receiving an acoustic signal and converting the acoustic signal containing transmission information back into an optical signal for transmission, wherein the acoustic signal amplifying and transmitting device and the acoustic receiving and acoustic-optical conversion device are arranged on both sides of a gapless transmission medium; the acoustic signal amplifying and transmitting device comprises a microwave resonance component and an acoustic wave amplifier 1, wherein the acoustic wave amplifier 1 is arranged at the acoustic wave output end of the microwave resonance component, and an optical lens group for assisting the transmission of the optical signal is arranged at the optical signal input end of the microwave resonance component.

[0020] The microwave resonance component of the present invention includes a microwave resonance cavity 2, in which an absorption medium 3 and a photoacoustic pool 4 are arranged. The absorption medium 3 converts the optical signal into an acoustic signal, and different absorption medium materials can be selected according to the optical signal conversion requirements; the converted acoustic signal is amplified by the photoacoustic pool 4 and transmitted to the acoustic wave amplifier 1. Carbon nanotubes 5 are arranged in the absorption medium 3, and the carbon nanotubes 5 can absorb and emit optical signals, thereby improving the absorption efficiency of the absorption medium 3. The microcavity resonator not only supports the resonance mode of light, but also can effectively couple optical waves with acoustic waves, thereby realizing the conversion of the photoacoustic effect. It uses a precisely designed photoacoustic coupling layer or region, so that the propagation of optical waves in the microcavity can not only enhance the intensity of optical waves, but also trigger the generation and amplification of acoustic waves, and finally realize the transmission and amplification of photoacoustic signals; so as to realize the enhancement of the photoacoustic conversion effect and smooth signal transmission in the case of limited optical signal transmission such as underground environment, and is particularly suitable for complex application scenarios requiring efficient signal transmission, low loss and high signal stability.

[0021] The photoacoustic signal transmission system of the present invention is arranged at a transmission node in a gapless environment. The source of its optical signal can be a signal transmitted by an external optical fiber, or a light source 22 for emitting optical signals is directly arranged in the acoustic signal amplifying and transmitting device. The carrier is emitted by the light source 22, and a corresponding optical signal modulator 23 is equipped to modulate the intensity or frequency of the optical signal to realize the transmission of information directly at the acoustic signal amplifying and transmitting device; the electrical components in the acoustic signal amplifying and transmitting device are all connected to a built-in power supply to provide electrical energy for the operation of the system.

[0022] The optical lens assembly of the present invention is used to process and transmit optical signals so that they can accurately pass through the microwave resonance component. The optical lens assembly includes a filter 6, a prism reflector 7 and a focusing lens 8 which are arranged in sequence on a movable base along the optical path. The carrier wavelength of the optical signal transmission is controlled by the filter 6, and the propagation direction of the modulated optical signal is changed by the prism reflector 7. The light beam is converged by the focusing lens 8 and enters the microwave resonance component. The optical lenses can also be increased or decreased according to the specific optical path design requirements. It is only necessary to ensure that the transmission of the optical signal can be guided. The lenses of the optical lens assembly of the present invention are all arranged on a movable base, and the base is controlled to slide by an electric device so as to modulate the position of the installed optical lenses to ensure that the optical path corresponds to the optical signal transmission path. In order to realize automatic adjustment, a corresponding controller 27 can be equipped to automatically adjust the transmission direction of the optical signal during debugging.

[0023] like Figure 2As shown, the sound receiving and sound-to-light conversion device of the present invention includes a sound signal receiving component, a sound signal filtering and processing component, and a sound-to-light conversion component. The sound signal filtering and processing component includes a filter 9, a dynamic range compressor 10, and a digital signal processor 11 arranged in sequence. The filter 9 is used to filter out background noise or useless frequency band signals. The dynamic range compressor 10 is used to optimize the signal amplitude range, reduce the difference of excessive dynamic range, and balance the amplitude of the signal. Finally, the sound signal is optimized and digitally processed by the digital signal processor 11, i.e., DSP, so as to perform sound-to-light conversion later. During the processing, an oscilloscope 24 and a display screen 25 can also be provided to realize the visualization of the sound signal, facilitate timely observation and control of the processing process, and ensure the optimization and amplification effect of the sound signal. The processed sound signal is converted by the sound-to-light conversion component and converted into an optical signal for transmission again.

[0024] The acousto-optic conversion assembly of the present invention comprises a driving power supply 12, a laser 13, a transducer 14, an acousto-optic medium 15, a coupling medium 16, an optical probe 17 and an optical fiber 18. The transducer 14 is electrically connected to the driving power supply 12. The coupling medium 16 is arranged between the transducer 14 and the acousto-optic medium 15. The transducer 14 converts the electrical signal into an acoustic wave and modulates the laser emitted by the laser 13 through the acousto-optic medium 15 to generate an optical signal with transmission information, and receives the optical signal through the arranged optical probe 17, and transmits the signal through the optical fiber 18 connected to the optical probe 17. An acoustic wave processing device 28 is arranged on the other side of the acousto-optic medium 15 opposite to the transducer 14. The acoustic wave processing device 28 can adopt an absorption device to absorb the mechanical wave (working in a traveling wave state) that has passed through the acousto-optic medium to avoid interference with the return medium. However, in order to make the mechanical wave field a standing wave state, the absorption device needs to be replaced with a mechanical wave reflection device. Different device types can be selected according to needs.

[0025] The sound signal receiving component includes a loudspeaker 19 and a microphone 20 and a piezoelectric sensor 21 disposed in the loudspeaker 19. The microphone 20 and the piezoelectric sensor 21 detect and receive low-frequency and high-frequency sound waves respectively to ensure the collection effect of the sound signal. At the same time, the electrical equipment in the sound receiving and sound-to-light conversion device can be powered by a preset power supply to maintain the normal operation of the device. The converted optical signal is converted into an electrical signal at the signal receiving end through a photomultiplier tube or a photodiode, and finally the signal is received by the signal receiver 26.

[0026] When an optical signal is converted into an acoustic signal for signal transmission in a gapless environment, the acoustic signal is usually interfered with by background noise, such as traffic noise, crowd noise, etc., thereby causing interference to the acoustic signal received by the receiving end, which will affect the accuracy of the final transmitted information. For this reason, the present invention provides an acoustic signal proofreading device for identifying and proofreading the acoustic signal on the side where the acoustic receiving and acoustic-optical conversion device is located. The acoustic signal proofreading device includes an acoustic signal receiving component consistent with the acoustic receiving and acoustic-optical conversion device, an acoustic signal filtering and processing component, and a calibration component for extracting features of the acoustic signal and comparing them with pre-stored standard template features. The acoustic signal proofreading device determines the acoustic wave with transmission information in the acoustic wave, and assists the acoustic receiving and acoustic-optical conversion device in identifying and converting the acoustic wave.

[0027] When using the sound signal proofreading device, it is necessary to collect the original sound signal, use filters (such as low-pass filtering, Gaussian filtering, etc.) to remove background noise, improve signal quality, adjust the signal amplitude to a standard range, and perform normalization processing to facilitate subsequent processing and comparison. The gain of the signal can also be adjusted as needed to enhance the strength of the effective signal part so as to extract the signal for comparison; when extracting signal features, the extracted features include time domain features and frequency domain features. The time domain features reflect the temporal change characteristics of the signal by calculating time domain parameters such as short-time energy and zero-crossing rate; frequency domain feature extraction extracts frequency components by performing fast Fourier transform (FFT) on the signal, which is applied to pitch and timbre analysis, and the extracted features are compared with the standard template features of the pre-stored sound signal transmission to identify the pattern corresponding to the sound signal.

[0028] The pattern of a sound signal usually refers to the specific regularity or structure of the sound signal in different time, frequency and other characteristic dimensions. These patterns mainly include speech features, such as the frequency spectrum and time domain features of each speech unit of a person's speech have certain regularities in different speakers or environments; noise or background interference, especially in different environments. Effective sound proofreading requires identifying and removing these unnecessary signals to extract effective speech information. In the process of pattern matching and proofreading, find the similarity between the sound signal to be processed and the standard template. Through dynamic time warping (DTW) or other pattern matching algorithms, the proofreading module can adjust the time scale or other variations of the input signal and the template to ensure that the two match, thereby completing the "proofreading" process of the sound, eliminating noise or environmental interference, and thus improving the accuracy of signal transmission; the proofreading results can be output and stored for subsequent learning, optimization and reference, and continuous improvement.

[0029] The present invention also discloses a gapless photoacoustic signal transmission method based on a microcavity resonator. Using the above-mentioned gapless photoacoustic signal transmission system, a light signal with transmission information enters a microwave resonance component under the transmission of an optical lens group in a gapless environment, and the light signal is converted into an acoustic signal by the microwave resonance component, and is amplified by an acoustic wave amplifier and transmitted to the other side of the gapless environment in the form of an acoustic wave, and the acoustic signal with transmission information is received by an acoustic receiving and acoustic-optical conversion device and converted into an optical signal again for transmission. When the present invention converts light signals and acoustic signals, the light signal is first amplified by the microwave resonance cavity of the microwave resonance component, and then photoacoustically converted by an absorbing medium, and the converted acoustic signal is amplified by a photoacoustic cell and enters the acoustic wave amplifier; when the acoustic receiving and acoustic-optical conversion device performs acoustic-optical conversion, the received acoustic signal can be first identified and proofread by a set acoustic signal proofreading device to confirm the acoustic signal that needs to be converted, and then the acoustic signal is converted in a targeted manner by the acoustic receiving and acoustic-optical conversion device to improve the efficiency and accuracy of signal transmission.

Claims

1. A gapless photoacoustic signal transmission system based on a microcavity resonator, characterized in that: The invention comprises an acoustic signal amplifying and transmitting device for converting and transmitting an optical signal, and an acoustic receiving and acoustic-optical conversion device for receiving an acoustic signal and converting the acoustic signal containing transmission information back into an optical signal for transmission, wherein the acoustic signal amplifying and transmitting device and the acoustic receiving and acoustic-optical conversion device are arranged on both sides of a gapless transmission medium; the acoustic signal amplifying and transmitting device comprises a microwave resonance component and an acoustic wave amplifier (1), wherein the acoustic wave amplifier (1) is arranged at the acoustic wave output end of the microwave resonance component, and an optical lens group for assisting the transmission of the optical signal is arranged at the optical signal input end of the microwave resonance component.

2. The gapless photoacoustic signal transmission system based on microcavity resonator according to claim 1 is characterized in that: The microwave resonance component comprises a microwave resonance cavity (2), an absorption medium (3) and a photoacoustic cell (4) are arranged in the microwave resonance cavity (2), a light signal is converted into a sound signal by the absorption medium (3), and the converted sound signal is amplified by the photoacoustic cell (4) and transmitted to the sound wave amplifier (1).

3. The gapless photoacoustic signal transmission system based on microcavity resonator according to claim 2 is characterized in that: Carbon nanotubes (5) are arranged in the absorption medium (3).

4. The gapless photoacoustic signal transmission system based on microcavity resonator according to claim 1, characterized in that: The optical lens assembly comprises a filter (6), a prism reflector (7) and a focusing lens (8) which are arranged in sequence on a movable base along the direction of the optical path. The carrier wavelength of the optical signal transmission is controlled by the filter (6), and the propagation direction of the modulated optical signal is changed by the prism reflector (7). The light beam is focused by the focusing lens (8) and enters the microwave resonance component.

5. The gapless photoacoustic signal transmission system based on microcavity resonator according to claim 1, characterized in that: The sound receiving and sound-to-light conversion device comprises a sound signal receiving component, a sound signal filtering and processing component, and a sound-to-light conversion component. The sound signal filtering and processing component comprises a filter (9), a dynamic range compressor (10), and a digital signal processor (11) which are arranged in sequence.

6. The gapless photoacoustic signal transmission system based on microcavity resonator according to claim 5, characterized in that: The acousto-optic conversion component comprises a driving power supply (12), a laser (13), a transducer (14), an acousto-optic medium (15), a coupling medium (16), an optical probe (17) and an optical fiber (18). The transducer (14) is electrically connected to the driving power supply (12). The coupling medium (16) is arranged between the transducer (14) and the acousto-optic medium (15). The acoustic wave generated by the transducer (14) modulates the laser light emitted by the laser (13) through the acousto-optic medium (15) to generate an optical signal with transmission information. The optical signal is received by the optical probe (17) and the signal is transmitted through the optical fiber (18) connected to the optical probe (17).

7. The gapless photoacoustic signal transmission system based on microcavity resonator according to claim 5, characterized in that: The sound signal receiving component comprises a loudspeaker (19), and a microphone (20) and a piezoelectric sensor (21) arranged in the loudspeaker (19), and low-frequency and high-frequency sound waves are detected and received respectively by the microphone (20) and the piezoelectric sensor (21).

8. The gapless photoacoustic signal transmission system based on microcavity resonator according to claim 5, characterized in that: An acoustic signal proofreading device for identifying and proofreading acoustic signals is arranged on the side where the acoustic receiving and acoustic-optical conversion device is located. The acoustic signal proofreading device comprises an acoustic signal receiving component consistent with the acoustic receiving and acoustic-optical conversion device, an acoustic signal filtering and processing component, and a calibration component for extracting features of the acoustic signal and comparing them with pre-stored standard template features. The acoustic signal proofreading device is used to determine the acoustic wave containing the transmission information, and assist the acoustic receiving and acoustic-optical conversion device in identifying and converting the acoustic wave.

9. A gapless photoacoustic signal transmission method based on a microcavity resonator, using the gapless photoacoustic signal transmission system according to any one of claims 1 to 8, characterized in that: The optical signal with transmission information enters the microwave resonance component under the transmission of the optical mirror group in the gapless environment, and is converted into an acoustic signal by the microwave resonance component. After being amplified by the acoustic wave amplifier, it is transmitted to the other side of the gapless environment in the form of acoustic waves. The acoustic signal with transmission information is received by the acoustic receiving and acoustic-optical conversion device and converted into an optical signal again for transmission.

10. The gapless photoacoustic signal transmission method based on microcavity resonator according to claim 9, characterized in that: When converting optical signals and acoustic signals, the optical signal is first amplified by the microwave resonant cavity of the microwave resonance component, and then the photoacoustic conversion is performed by the absorption medium. The converted acoustic signal is amplified by the photoacoustic cell and then enters the acoustic wave amplifier. When the acoustic receiving and acoustic-optical conversion device performs the acoustic-optical conversion, the received acoustic signal is first identified and proofread by the set acoustic signal proofreading device to confirm the acoustic signal that needs to be converted.

Images