Photoacoustic field coupling structure and coupling method

Abstract

This invention discloses a photoacoustic field coupling structure and coupling method, belonging to the field of photoacoustic coupling technology. The coupling structure includes a coupling body, a signal receiving unit, and a signal output unit. The coupling body is a three-layer integrated structure consisting of a light transmission layer, an acoustic reflection layer, and a field coupling layer, which are physically bonded together using high-temperature resistant epoxy adhesive. The light transmission layer is made of quartz glass, the acoustic reflection layer is made of aluminum foil, and the field coupling layer is made of piezoelectric ceramic sheet. The core coupling function is achieved through the physical material properties and structural design, without relying on built-in chips, power supplies, or integrated circuits. Optional low-power auxiliary micro-devices can be integrated without participating in the core coupling process. The signal receiving unit receives three types of signals, and the signal output unit uses a coaxial cable interface for direct connection to external devices. The coupling method achieves the coordinated coupling of light, sound, and field signals through four steps: signal interaction, coordinated coupling, signal reception, and signal output. The coupling efficiency is ≥60%, and a clear method for testing the coupling efficiency is provided. This invention features a simple structure, low power consumption, high coupling efficiency, and good stability, and can be widely applied in photoacoustic scenarios such as detection equipment and sensing systems, possessing independent technical and application value.

Description

Technical Field

[0001] This invention belongs to the field of photoacoustic coupling technology, specifically relating to a photoacoustic field coupling structure and coupling method, which is applicable to the coordinated coupling of three types of signals: light, sound, and field. It can be widely used in various fields that require coordinated coupling of photoacoustic signals, such as detection equipment and sensing systems, and has independent technical value and application scenarios. Background Technology

[0002] In the field of optoacoustic coupling technology, the coordinated coupling of optical signals, acoustic signals (mechanical waves), and field signals is the core element for achieving high-precision detection and signal transmission. Existing coupling structures are mostly single-signal coupling designs, unable to achieve coordinated coupling of optical, acoustic, and field signals. Furthermore, some coupling structures rely on built-in chips, power supplies, and integrated circuits, resulting in complex structures, high power consumption, and poor stability. Simultaneously, the key parameters of existing coupling structures are not quantified, there are no clear testing methods for coupling efficiency, leading to poor feasibility and a lack of auxiliary compensation designs. This results in insufficient coupling stability under complex environments, making it difficult to meet practical application requirements.

[0003] In view of the shortcomings of the existing technology, there is an urgent need for a simple optical acoustic field coupling structure and coupling method that does not rely on integrated circuits, has high coupling efficiency, and good stability, so as to solve the problems existing in the existing technology. Summary of the Invention

[0004] 1. Purpose of the invention The purpose of this invention is to overcome the shortcomings of the prior art and provide a photoacoustic field coupling structure and coupling method to achieve coordinated coupling of three types of signals: light, sound, and field. This simplifies the structure, reduces power consumption, improves coupling efficiency and stability, and meets the needs of practical applications.

[0005] 2. Technical Solution An optical-acoustic field coupling structure includes a coupling body, a signal receiving unit, and a signal output unit. The coupling body is a three-layer integrated structure consisting of a light transmission layer, an acoustic reflection layer, and a field coupling layer. The light transmission layer is made of quartz glass (transmittance ≥ 98%), the acoustic reflection layer is made of aluminum foil (reflectivity ≥ 95%), and the field coupling layer is made of piezoelectric ceramic sheet (dielectric constant 1000-2000). The three layers are physically bonded together with high-temperature resistant epoxy adhesive (bonding strength ≥ 5MPa) to achieve coordinated coupling of optical signals, acoustic signals (mechanical waves), and field signals, completing signal coupling and conversion with a coupling efficiency ≥ 60%.

[0006] The coupling structure is a pure physical layer coupling structure. The core coupling function is achieved through physical material properties and structural design, without relying on built-in chips, power supplies, or integrated circuits. The coupling body may optionally integrate auxiliary micro-devices for parameter stabilization and environmental compensation. The total power consumption of the auxiliary micro-devices is ≤10mW, and they do not participate in the core processes of generating, converting, and transmitting coupling signals. They are not used as core coupling functional components, and the auxiliary micro-devices do not contain chips, power supplies, or integrated circuits, thus avoiding contradictions with the "pure physical layer coupling" limitation.

[0007] The light-transmitting layer (quartz glass) has low impedance to sound waves, allowing them to efficiently pass through and reach the sound-reflecting layer. The sound-reflecting layer (aluminum foil) simultaneously exhibits high reflectivity to light signals, causing secondary reflections and increasing the interaction path between light and sound. The field coupling layer (piezoelectric ceramic) generates a piezoelectric effect under the influence of sound waves, producing a field signal output synchronized with the light signal. This three-layer structure achieves synergistic enhancement of light, sound, and field through the physical matching of material properties, rather than simple superposition, effectively avoiding mutual interference between various signals.

[0008] Furthermore, the signal receiving unit includes an optical signal receiver, an acoustic signal receiver, and a field signal receiver, which respectively receive the optical signal transmitted through the optical transmission layer, the acoustic signal reflected by the acoustic reflection layer, and the field signal coupled by the field coupling layer, with a receiving sensitivity ≥85dB to ensure the accuracy and integrity of signal reception.

[0009] Furthermore, the signal output unit adopts a coaxial cable interface, with an output signal amplitude of 0.5-5V and an output impedance of 50Ω, which can be directly connected to external testing equipment, improving ease of use.

[0010] A coupling method based on the above-mentioned photoacoustic field coupling structure includes the following steps: S1: Signal Action: Optical signals, acoustic signals (mechanical waves), and field signals are applied to the optical transmission layer, acoustic reflection layer, and field coupling layer of the coupling body, respectively. The optical signal enters the interior of the coupling body after being transmitted through the optical transmission layer. The acoustic signal is reflected by the acoustic reflection layer and forms a synergistic effect with the optical signal. The field signal penetrates into the interior of the coupling body through the field coupling layer. The low impedance characteristics of the optical transmission layer to acoustic waves, the high reflectivity of the acoustic reflection layer to optical signals, and the piezoelectric effect of the field coupling layer achieve synergistic enhancement of the three and avoid interference.

[0011] S2: Cooperative Coupling: The coupling body achieves cooperative coupling of three types of signals—light, sound, and field—through the physical characteristics of the three-layer structure and the integrated bonding design, completing the signal conversion and integration, and ensuring a coupling efficiency of ≥60%. The coupling efficiency is verified through a clear testing method to ensure data reliability.

[0012] S3: Signal Reception: The signal receiving unit receives various coupled signals, performs preliminary filtering, and then transmits them to the signal output unit to remove noise interference and ensure signal quality.

[0013] S4: Signal Output: The signal output unit stably outputs the processed coupled signal to the external device, completing the entire coupling process; if the coupling body is optionally integrated with auxiliary micro-devices, the auxiliary micro-devices simultaneously stabilize the coupling parameters and compensate for the environment, do not participate in the core signal coupling process, and do not include chips, power supplies, or integrated circuits.

[0014] 3. Beneficial effects Compared with the prior art, the present invention has the following advantages: (1) Achieve synergistic coupling of three types of signals: The three-layer integrated structure of "light transmission layer - sound reflection layer - field coupling layer" is adopted. The light-sound-field synergistic enhancement is achieved through material property matching, which solves the defect of single signal coupling in the existing technology and broadens the application scenarios; (2) Simple structure and low power consumption: Pure physical layer coupling design, does not rely on built-in chips, power supply and integrated circuits, optional integrated auxiliary micro devices with low power consumption (≤10mW), simple overall structure and easy to fabricate; (3) High coupling efficiency and good stability: Quantify key material parameters and coupling efficiency (≥60%), clarify the coupling efficiency test method, ensure stable coupling performance, and improve applicability in complex environments by using auxiliary micro-devices to achieve environmental compensation. (4) Easy to use: The signal output unit adopts a coaxial cable interface, which can be directly connected to external detection equipment without additional adapters, improving ease of use. It can be widely used in various photoacoustic co-coupling scenarios such as detection equipment and sensing systems, and has independent application value and technological innovation. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments, so that those skilled in the art can understand it. Example 1:

[0016] An optical-acoustic field coupling structure includes a coupling body, a signal receiving unit, and a signal output unit. The coupling body is a three-layer integrated structure consisting of a light transmission layer, an acoustic reflection layer, and a field coupling layer. The light transmission layer is made of quartz glass with a transmittance of 98.5% and a thickness of 2 mm. The acoustic reflection layer is made of aluminum foil with a reflectivity of 96% and a thickness of 0.1 mm. The field coupling layer is made of piezoelectric ceramic sheet with a dielectric constant of 1500 and a thickness of 1 mm. The three layers are physically bonded together with high-temperature resistant epoxy adhesive (with a bonding strength of 6 MPa) to achieve coordinated coupling of optical signals, acoustic signals (mechanical waves), and field signals, completing signal coupling and conversion with a coupling efficiency of 62%.

[0017] The coupling structure is a pure physical layer coupling structure. The core coupling function is realized through physical material properties and structural design, without relying on built-in chips, power supplies and integrated circuits. The coupling body can optionally integrate auxiliary micro-devices (micro temperature compensation resistors) for parameter stabilization and environmental compensation. The total power consumption is 8mW. It does not participate in the core process of generating, converting and transmitting coupling signals, does not serve as a core coupling functional component, and does not contain chips, power supplies and integrated circuits.

[0018] The signal receiving unit includes an optical signal receiver, an acoustic signal receiver, and a field signal receiver, all with a receiving sensitivity of 88dB. These receivers correspond to receiving the optical signal transmitted through the optical transmission layer, the acoustic signal reflected by the acoustic reflection layer, and the field signal coupled by the field coupling layer, respectively. The signal output unit uses a coaxial cable interface, with an output signal amplitude of 2V and an output impedance of 50Ω, and can be directly connected to external detection equipment.

[0019] The coupling method based on the above photoacoustic field coupling structure includes the following steps: S1: An optical signal (wavelength 532nm, power 10mW), an acoustic signal (frequency 1kHz, amplitude 0.5μm), and a field signal (electric field strength 10V / m) are applied to the optical transmission layer, acoustic reflection layer, and field coupling layer of the coupling body, respectively. The optical signal enters the interior of the coupling body after being transmitted through the optical transmission layer. The acoustic signal is reflected by the acoustic reflection layer and forms a synergistic effect with the optical signal. The field signal penetrates into the interior of the coupling body through the field coupling layer. Among them, the low impedance characteristic of the optical transmission layer to acoustic waves allows the acoustic waves to efficiently pass through the optical transmission layer to reach the acoustic reflection layer. The high reflectivity of the acoustic reflection layer to optical signals prolongs the propagation path of the optical signals. The field coupling layer generates a piezoelectric effect under the excitation of acoustic waves, forming a field signal synchronized with the optical and acoustic signals. The three enhance each other synergistically without mutual interference.

[0020] S2: The coupling body achieves coordinated coupling of three types of signals—light, sound, and field—through the physical characteristics of its three-layer structure and integrated bonding design, completing signal conversion and integration with a coupling efficiency of 62%. Coupling efficiency test method: Coupling efficiency is defined as the ratio of the output coupled signal power to the total power of the three input signals. The test conditions are: light signal wavelength 532nm, power 10mW, sound signal frequency 1kHz, sound pressure level 100dB, and field signal electric field strength 10V / m. A power meter is used to measure the total input power (Pin) and the output coupled signal power (Pout). Coupling efficiency η = (Pout / Pin) × 100%. The test is repeated 3 times, and the average value is taken as the final coupling efficiency.

[0021] S3: The signal receiving unit receives various coupled signals respectively, performs preliminary filtering (filtering frequency range 10Hz-10kHz), and then transmits them to the signal output unit. S4: The signal output unit stably outputs the processed coupled signal to the external device, completing the entire coupling process; the auxiliary miniature temperature compensation resistor simultaneously stabilizes the coupling parameters, with a compensation temperature range of -10℃ to 60℃, and does not participate in the core signal coupling process. Example 2:

[0022] An optical-acoustic field coupling structure differs from Example 1 in that: the light transmission layer has a light transmittance of 99%, the acoustic reflection layer has a reflectivity of 95%, the field coupling layer has a dielectric constant of 1000, the high-temperature resistant epoxy adhesive has a bonding strength of 5MPa, and the coupling efficiency is 60%; the auxiliary micro-device is a micro humidity compensation sensor with a total power consumption of 10mW; the signal receiving unit has a receiving sensitivity of 85dB, and the signal output unit outputs a signal amplitude of 0.5V.

[0023] The coupling method is the same as in Example 1, except that in S4, the miniature humidity compensation sensor compensates for the humidity of the coupling environment. The compensation humidity range is 30%-80%, ensuring that the coupling efficiency is stable at 60%. Example 3:

[0024] An optical-acoustic field coupling structure differs from Example 1 in that: the light transmission layer has a transmittance of 98%, the acoustic reflection layer has a reflectivity of 97%, the field coupling layer has a dielectric constant of 2000, the high-temperature resistant epoxy adhesive has a bonding strength of 7MPa, and the coupling efficiency is 65%; the auxiliary micro-device is a micro voltage stabilizer with a total power consumption of 5mW; the signal receiving unit has a receiving sensitivity of 90dB, and the signal output unit outputs a signal amplitude of 5V.

[0025] Its coupling method is the same as in Example 1, except that in S4, the miniature voltage stabilizer stabilizes the output signal amplitude to ensure that the output signal amplitude is maintained at around 5V.

[0026] Supplement to Coupling Efficiency Test Methods: Coupling efficiency is defined as the ratio of the output coupled signal power to the total power of the three input signals. Test conditions: optical signal wavelength 532nm, power 10mW; acoustic signal frequency 1kHz, sound pressure level 100dB; electric field strength of the field signal 10V / m. A power meter was used to measure the total input power and the output coupled signal power, and the ratio was calculated. The test was repeated three times, and the average value was taken as the final coupling efficiency, ensuring that η≥60%.

Claims

1. A photoacoustic field coupling structure, characterized by, It includes a coupling body, a signal receiving unit, and a signal output unit. The coupling body is a three-layer integrated structure consisting of a light transmission layer, an acoustic reflection layer, and a field coupling layer. The light transmission layer is made of quartz glass (transmittance ≥ 98%), the acoustic reflection layer is made of aluminum foil (reflectivity ≥ 95%), and the field coupling layer is made of piezoelectric ceramic sheet (dielectric constant 1000-2000). These three layers are physically bonded together with high-temperature resistant epoxy adhesive (bonding strength ≥ 5MPa) to achieve coordinated coupling of optical signals, acoustic signals (mechanical waves), and field signals, completing signal coupling and conversion, with a coupling efficiency ≥ 60%; The coupling structure is a pure physical layer coupling structure, and the core coupling function is realized through physical material properties and structural design, without relying on built-in chips, power supplies and integrated circuits; The coupling body may optionally integrate auxiliary micro-devices for parameter stabilization and environmental compensation. The total power consumption of the auxiliary micro-devices is ≤10mW, and they do not participate in the core process of generating, converting and transmitting the coupling signal, and are not used as core coupling functional components. The auxiliary micro-devices do not contain chips, power supplies and integrated circuits, further avoiding contradictions with the limitation of "pure physical layer coupling, without relying on built-in chips, etc." 2. The photoacoustic field coupling structure according to claim 1, characterized in that, The signal receiving unit includes an optical signal receiver, an acoustic signal receiver, and a field signal receiver, which respectively receive the optical signal transmitted through the optical transmission layer, the acoustic signal reflected by the acoustic reflection layer, and the field signal coupled by the field coupling layer, with a receiving sensitivity ≥85dB.

3. The photoacoustic field coupling structure according to claim 1, characterized in that, The signal output unit uses a coaxial cable interface, with an output signal amplitude of 0.5-5V and an output impedance of 50Ω, and can be directly connected to external testing equipment.

4. A coupling method based on the photoacoustic field coupling structure according to any one of claims 1-3, characterized in that, Includes the following steps: S1: Optical signals, acoustic signals (mechanical waves), and field signals are applied to the light transmission layer, acoustic reflection layer, and field coupling layer of the coupling body, respectively. The optical signal enters the interior of the coupling body after being transmitted through the light transmission layer. The acoustic signal interacts with the optical signal after being reflected by the acoustic reflection layer. The field signal penetrates into the interior of the coupling body through the field coupling layer. The low impedance of the light transmission layer (quartz glass) to acoustic waves allows acoustic waves to pass through the light transmission layer efficiently to reach the acoustic reflection layer. The high reflectivity of the acoustic reflection layer (aluminum foil) to optical signals prolongs the propagation path of the optical signal in the coupling body and increases the interaction time between light and sound. The field coupling layer (piezoelectric ceramic sheet) generates a piezoelectric effect under the excitation of acoustic waves, forming a field signal synchronized with the optical and acoustic signals, achieving synergistic enhancement of the three and avoiding mutual interference. 5.S2: The coupling body achieves coordinated coupling of light, sound, and field signals through the physical characteristics of the three-layer structure and integrated bonding design, completing signal conversion and integration, and ensuring coupling efficiency ≥60%. The coupling efficiency is tested by the following method: the coupling efficiency is defined as the ratio of the output coupled signal power to the total power of the three input signals. The test conditions are: light signal wavelength 532nm, power 10mW, sound signal frequency 1kHz, sound pressure level 100dB, field signal electric field strength 10V / m. The total input power (Pin) and the output coupled signal power (Pout) are measured by a power meter. The coupling efficiency η = (Pout / Pin) × 100%. The test is repeated 3 times, and the average value is taken as the final coupling efficiency. 6.S3: The signal receiving unit receives various coupled signals respectively, and transmits them to the signal output unit after preliminary filtering. S4: The signal output unit stably outputs the processed coupled signal to the external device, completing the entire coupling process; if the coupling body is optionally integrated with auxiliary micro-devices, the auxiliary micro-devices simultaneously stabilize the coupling parameters and compensate for the environment, do not participate in the core signal coupling process, and do not include chips, power supplies, or integrated circuits.