Micro torsion balance effect amplification device and method based on resonance regulation

Abstract

This application belongs to the field of precision measurement, and specifically discloses a micro torsion balance effect amplification device and method based on resonance regulation. Through the resonance coupling of the target micro torsion balance and the auxiliary micro torsion balance, this application can respond within a wider frequency range, thereby improving the measurement accuracy of the system for weak signals; due to the coupling effect of the resonance of the two, external noise cannot fully match the resonance frequency of the system, thus greatly reducing the interference and influence of environmental noise. This is very important for detecting extremely weak signals such as dark matter, and can effectively improve the signal-to-noise ratio of the measurement. By precisely controlling the laser torque acting on the micro torsion balance, mechanical contact and friction effects are reduced. Compared with traditional methods, it has extremely high potential sensitivity and improves the measurement accuracy and stability.

Description

Technical Field

[0001] This application belongs to the field of precision measurement, and more specifically, relates to a micro torsion balance effect amplification device and method based on resonance regulation. Background Art

[0002] With the development of science and technology, higher requirements are put forward for the measurement of weak forces, and the micro torsion balance shows obvious advantages in improving sensitivity. A micro torsion balance usually includes a suspension wire and a test mass in the microgram to milligram range, etc. The working principle is as follows: when a weak external force acts on the test mass block, a torque will be generated, causing the suspension wire to undergo a small twist. By monitoring the twist angle with a high-precision instrument, the precise measurement of the external force can be achieved.

[0003] In weak force measurement, a micro torsion balance is mostly used as a detection unit. However, when the micro torsion balance is the substance to be measured, its signal to be measured is also quite small (10 -18 N·m), which is difficult to detect. At the same time, the detector also has a lower sensitivity limit (10 -25 Nm / Hz 0.5 ), especially when detecting dark matter or other unknown particles that may exist in the micro torsion balance. Due to their extremely weak interaction with ordinary matter, the signal is even more difficult to capture.

[0004] In order to improve the accuracy of this measurement device, it is urgently necessary to amplify the rotation signal of the micro torsion balance. Summary of the Invention

[0005] Aiming at the defects of the prior art, the purpose of this application is to provide a micro torsion balance effect amplification device and method based on resonance regulation, aiming to solve the problem that the rotation signal of the existing micro torsion balance is weak, resulting in the inability to meet the accuracy requirements for detecting possible dark matter or other unknown particles inside the micro torsion balance.

[0006] The first aspect of the present application relates to a micro torsion balance effect amplification device based on resonance regulation. The amplification device includes: a laser, a planar beam splitter, a concave mirror, an auxiliary micro torsion balance, an optical path adjustment component, and a light intensity adjustment component; the auxiliary micro torsion balance is composed of a test mass suspended by a suspension wire, and a reflective film is plated on one side of the test mass; the laser is used to emit laser light and irradiate it onto the planar beam splitter; the planar beam splitter, the test mass, and the concave mirror are arranged in sequence along the optical path to form a three-mirror ring cavity; the optical path adjustment component is used to change the position of at least one of the planar beam splitter, the test mass, and the concave mirror to change the resonant cavity length of the three-mirror ring cavity; the light intensity adjustment component is used to change the incident light power of the incident light signal of the laser; the optical path adjustment component and the light intensity adjustment component cooperate to cause optical resonance to occur in the three-mirror ring cavity, generating an optical pressure acting on the test mass in the auxiliary micro torsion balance, and the optical pressure causes the suspension wire in the auxiliary micro torsion balance to twist, and the magnitude of the optical pressure ensures that the movement frequencies of the auxiliary micro torsion balance and the target micro torsion balance are the same and mechanical resonance occurs.

[0007] In some embodiments, the amplification device further includes a photodetector for real-time monitoring of the light intensity at the output end of the three-mirror ring cavity, and the fact that the light intensity reaches a peak indicates that optical resonance occurs in the three-mirror ring cavity.

[0008] In some embodiments, the amplification device further includes a laser displacement sensor for detecting the displacement change of the target micro torsion balance, and the fact that the displacement amplitude reaches a peak indicates that mechanical resonance occurs between the auxiliary micro torsion balance and the target micro torsion balance.

[0009] In some embodiments, the concave mirror supports torsion to change the reflection angle and focal position of the light beam in the three-mirror ring cavity.

[0010] In some embodiments, the mirror material in the three-mirror ring cavity is selected as a silver-plated mirror, and the reflectivity is greater than 99.99%.

[0011] In some embodiments, the amplification device further includes a plurality of spare auxiliary micro torsion balances and supports the replacement of the auxiliary micro torsion balance to be as consistent with the target micro torsion balance as possible.

[0012] In some embodiments, the optical path adjustment component changes the resonant cavity length of the three-mirror ring cavity in at least one of the following ways: (1) changing the distance between the planar beam splitter and the test mass; (2) changing the distance between the test mass and the concave mirror; (3) changing the radius of curvature of the concave mirror.

[0013] The second aspect of the present application relates to a micro torsion balance effect amplification method based on resonance regulation. This method is applied to the amplification device according to any one of the embodiments of the present application. The method includes:

[0014] S1. Change the optical power of the incident optical signal and / or the resonant cavity length of the three-mirror ring cavity so that optical resonance occurs in the three-mirror ring cavity, generating an optical pressure acting on the test mass, and the optical pressure causes the suspension wire to twist;

[0015] S2. Repeat step S1 until the magnitude of the generated optical pressure ensures that the motion frequencies of the auxiliary micro torsion balance and the target micro torsion balance are the same and mechanical resonance occurs.

[0016] In some embodiments, to change the resonant cavity length of the three-mirror ring cavity, the specific method is as follows: Adjust the position of the concave mirror so that it moves on the perpendicular bisector of the plane beam splitter and the test mass until optical resonance occurs.

[0017] In some embodiments, during operation, the distance between the auxiliary micro torsion balance and the target micro torsion balance is small enough to ensure mechanical coupling; they are placed coplanarly and have the same vibration direction.

[0018] It can be understood that the beneficial effects of the second aspect above can be referred to the relevant descriptions in the first aspect above, and will not be elaborated here.

[0019] Generally speaking, compared with the prior art, the above technical solution conceived by this application has the following beneficial effects:

[0020] This application proposes a micro torsion balance effect amplification device based on resonance regulation. Through the resonance coupling of the target micro torsion balance and the auxiliary micro torsion balance, it can respond in a wider frequency range, thereby improving the measurement accuracy of weak torque signals (such as the interaction force of dark matter); due to the coupling effect of the resonance of the two, external noise cannot completely match the resonance frequency of the system, thereby greatly reducing the interference and influence of environmental noise. This is very important for measuring extremely small subatomic-level torque changes or dark matter interaction signals, and can effectively improve the signal-to-noise ratio of the measurement. By precisely controlling the laser torque acting on the micro torsion balance and reducing the mechanical contact and friction effects, compared with traditional methods, it has extremely high potential sensitivity and improves the measurement accuracy and stability. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a micro torsion balance effect amplification device based on resonance regulation provided by an embodiment of this application.

[0022] In all the drawings, the same reference numerals are used to represent the same elements or structures, where:

[0023] 1 is a laser, 2 is a plane beam splitter, 3 is an auxiliary micro torsion balance, 4 is a concave mirror, 5 is an optical path adjustment component, 6 is an optical intensity adjustment component, 7 is a target micro torsion balance, and 8 is a laser displacement sensor. Detailed Embodiments

[0024] In order to make the objectives, technical solutions and advantages of this application clearer and more understandable, the following further details this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0025] First, the technical terms involved in the embodiments of this application are introduced.

[0026] For ease of understanding, the following first explains and describes the English abbreviations and relevant technical terms involved in the embodiments of this application.

[0027] Plane beam splitter: An optical element that partially reflects and partially transmits incident light energy in a specific ratio (such as 50:50, 70:30, etc.), usually realized by depositing a beam splitting film layer on a plane glass substrate.

[0028] Resonant cavity: Usually composed of two or more mirrors (or reflecting surfaces), which reflect light or electromagnetic waves multiple times in the cavity. Each reflection causes the light to propagate a certain distance in the cavity and interact with the medium in the cavity. When the frequency of the light matches the resonant frequency of the cavity, the light forms a stable standing wave or traveling wave mode in the cavity, thereby achieving energy accumulation and enhancement.

[0029] Resonant frequency of the resonant cavity: The natural resonance frequency of the light wave inside the optical cavity, that is, the frequency determined by the physical size (such as length) and mirror configuration of the optical cavity. It is determined by the geometric structure of the cavity (such as length, shape) and the optical properties of the medium (such as refractive index). When the input light frequency of the optical cavity matches the resonant frequency of the optical cavity, the optical cavity can effectively amplify the optical signal, resulting in an increase in light intensity. This process is called optical resonance.

[0030] Three-mirror cavity: A resonant cavity composed of three mirrors, and the arrangement of the mirrors can be linear, circular or other complex shapes.

[0031] Three-mirror ring cavity: Usually a resonant cavity composed of three mirrors, two of which are plane mirrors and the other is a concave mirror with a relatively large radius of curvature.

[0032] Next, the embodiments of this application are described in conjunction with the accompanying drawings in the embodiments of this application.

[0033] In a first aspect, as Figure 1 shown, this application discloses a micro torsion balance effect amplification device based on resonance regulation. The amplification device includes: a laser 1, a plane beam splitter 2, a concave mirror 4, an auxiliary torsion balance 3, an optical path adjustment component 5, and a light intensity adjustment component 6.

[0034] The auxiliary torsion balance 3 is composed of a test mass suspended by a suspension wire, and a reflective film is plated on one side of the test mass.

[0035] The laser 1 is used to emit laser light and irradiate it onto the planar beam splitter 2.

[0036] The planar beam splitter 2, the test mass 3, and the concave mirror 4 are arranged in sequence along the optical path to form a three-mirror ring cavity.

[0037] The optical path adjusting component 5 is used to change the position of at least one of the planar beam splitter 2, the test mass 3, and the concave mirror 4 to change the resonant cavity length of the three-mirror ring cavity.

[0038] The light intensity adjusting component 6 is used to change the incident light power of the incident light signal of the laser 1.

[0039] The optical path adjusting component 5 and the light intensity adjusting component 6 cooperate to cause optical resonance to occur in the three-mirror ring cavity, generating an optical pressure acting on the test mass in the auxiliary torsion balance. The optical pressure causes the suspension wire in the auxiliary torsion balance to twist, and the magnitude of the optical pressure ensures that the movement frequencies of the auxiliary torsion balance and the target torsion balance 7 are the same and mechanical resonance occurs.

[0040] The control method of the torsion balance in this application is laser control. The laser serves as the excitation unit, and its adjustable frequency range is wide and the precision is high, with a range not exceeding 20 MHz per day. The emitted laser light is incident on the three-mirror cavity through the planar beam splitter, used to excite the resonance frequency in the optical cavity system, enabling the optical cavity system to effectively amplify the optical signal of a specific frequency and enhancing the sensitivity of precision measurement. This incident method is relatively simple and convenient for adjusting and controlling the total internal reflection characteristics of the surface of the optical path plane mirror, enabling the light to be stably reflected and introduced into the cavity.

[0041] The amplification device further includes an optical power adjusting device (not shown), which is used to maintain the stable output of the optical power under various environmental changes, thereby improving the overall stability and anti-interference ability of the system, and having fast response and high-precision control capabilities to ensure the normal operation and good performance of each optical device in the experiment.

[0042] As Figure 1 shown, the light beam continuously reflects between the three mirrors in the three-mirror cavity, forming a closed triangular path. When the wavelength or frequency of the incident light beam satisfies the resonance condition of the three-mirror ring cavity, the light beam forms a traveling wave mode in the cavity. The formation of the traveling wave mode depends on the geometric dimensions of the resonant cavity.

[0043] In this application, the incident light power is changed through the light intensity adjusting component, and then the stable circulating power in the cavity is changed.

[0044] In some embodiments, the amplification device further includes a photodetector (not shown), which is used to monitor the light intensity at the output end of the three-mirror ring cavity in real time. When the light intensity reaches the peak value, it indicates that optical resonance occurs in the three-mirror ring cavity.

[0045] It should be noted that a photodetector is used to monitor the light intensity at the output end of the three-mirror ring cavity in real time. When the three-mirror cavity approaches the resonant frequency, the output light intensity will increase significantly and reach a peak value.

[0046] In some embodiments, the amplification device further includes a laser displacement sensor 8 for detecting the displacement change of the target microtorsion balance 7. The peak value of the displacement amplitude indicates that the auxiliary microtorsion balance 3 and the target microtorsion balance 7 undergo mechanical resonance.

[0047] The laser displacement sensor only needs to be aligned with a specific point of the target microtorsion balance. The end or a significant position can be selected to detect its displacement change.

[0048] In some embodiments, the concave mirror supports torsion to change the reflection angle and focal position of the light beam in the three-mirror ring cavity.

[0049] In the present application, a displacement stage is installed under the concave mirror to change the placement position and / or torsion angle of the concave mirror. By adjusting its position and angle, the propagation path of the light beam in the cavity can be changed, the light beam can be accurately aligned, and it can be ensured that the light beam can be correctly reflected and folded back in the cavity, so as to form a stable light beam path in the cavity. Adjusting the angle can also affect the reflection angle and focal position of the light beam in the cavity.

[0050] In some embodiments, the mirror surface material in the three-mirror ring cavity is selected as a silver-plated lens, and the reflectivity is greater than 99.99% to adapt to laser beams with different frequencies and powers, ensure the minimum loss during multiple reflections of light in the optical cavity, and enhance the stability and intensity of the optical signal. Through the above design, it is ensured that the device maintains sufficient stability and consistency during high-precision frequency tuning, and effectively prevents the interference of laser frequency drift on the measurement results.

[0051] In some embodiments, the amplification device further includes a plurality of spare auxiliary microtorsion balances and supports the replacement of the auxiliary microtorsion balances to be as consistent with the target microtorsion balance as possible.

[0052] In some embodiments, the optical path adjustment component changes the resonant cavity length of the three-mirror ring cavity in at least one of the following ways: (1) changing the distance between the plane beam splitter and the test mass; (2) changing the distance between the test mass and the concave mirror; (3) changing the radius of curvature of the concave mirror.

[0053] The amplification device is embedded with a tuning module that can adjust the parameters of each component according to real-time feedback.

[0054] In a second aspect, the present application discloses a method for amplifying the microtorsion balance effect based on resonance regulation. The method is applied to the amplification device according to any one of the embodiments of the present application. The method includes:

[0055] S1. Change the optical power of the incident optical signal and / or the resonant cavity length of the three-mirror ring cavity, so that optical resonance occurs in the three-mirror ring cavity, generating an optical pressure acting on the test mass, and the optical pressure causes the suspension wire to twist.

[0056] S2. Repeat step S1 until the magnitude of the generated optical pressure ensures that the motion frequencies of the auxiliary micro torsion balance and the target micro torsion balance are the same and mechanical resonance occurs.

[0057] In some embodiments, to change the resonant cavity length of the three-mirror ring cavity, the specific method is as follows: adjust the position of the concave mirror so that it moves on the perpendicular bisector of the plane beam splitter and the test mass until optical resonance occurs.

[0058] In some embodiments, during operation, the distance between the auxiliary micro torsion balance and the target micro torsion balance is small enough to ensure mechanical coupling; they are placed coplanarly and have the same vibration direction.

[0059] It should be noted that the distance between the two micro torsion balances should be close enough to ensure that the interaction between them is strong enough. This helps to significantly affect the motion of one torsion balance by the motion of the other. There is no unified value for the specific distance, which depends on the design, size of the torsion balance and the properties of the surrounding medium. Generally speaking, the distance should be in the range of a few millimeters to a few centimeters to ensure effective mechanical coupling.

[0060] The two micro torsion balances are preferably placed in the same plane. Coplanar placement helps to maximize the transmission efficiency of the vibration wave through the medium and enhance the interaction between them.

[0061] To ensure the coupling efficiency, the vibration directions of the two micro torsion balances are also the same. For example, if one micro torsion balance vibrates in the horizontal plane, the other micro torsion balance should also vibrate in the same horizontal plane.

[0062] Embodiment

[0063] In this embodiment, both the auxiliary micro torsion balance 3 and the target micro torsion balance 7 are composed of micro torsion balances suspended by high-Q thin quartz wires. The detection sensitivity can reach 10 -18 Nm / Hz 0.5 or more, and the Q value can reach hundreds of thousands. When amplifying the target micro torsion balance, ignoring air resistance, the target micro torsion balance can be regarded as moving at its natural frequency.

[0064] S1. Obtain the initial tuning state of the optical cavity, including the initial laser frequency used by the laser frequency adjustment system to excite the optical cavity.

[0065] Laser frequency tuning includes adjusting the optical path length and laser intensity of the laser incident on the optical cavity.

[0066] S2. Precisely align the beam of the laser frequency adjustment system with the mirror array for mirror adjustment. Combining the optical cavity width and optical cavity length, adjust the reflection path of light and the resonance state of the optical cavity.

[0067] It is necessary to align the mirror position to ensure the formation of a stable optical cavity resonance during the laser reflection process. There are various ways to observe the resonance situation, including but not limited to: adding an optical power meter for detection in the optical path, etc.

[0068] The optical cavity resonance state refers to the resonance mode formed by the phase superposition when light is reflected in the cavity, that is, the state capable of forming a traveling wave, which is not the same as the mechanical resonance of the auxiliary micro torsion balance and the target micro torsion balance. The optical pressure in the optical cavity (the force exerted by the photon momentum on the reflecting surface) will generate a torque on the torsion balance, resulting in the torsion of the torsion balance. When a traveling wave is formed in the three-mirror ring cavity, that is, when the optical cavity is in the resonance mode, the optical force on the torsion balance is relatively large, and at this time, the torsion balance is more easily driven.

[0069] S3. Obtain the mirror position and optical path length in the initial state, combine the power output of the laser tuning unit, record the delay of the optical cavity mirror and the debugging process of the laser frequency, and ensure the stability of the optical cavity resonance in the initial state.

[0070] The data recorded in step S3 includes: the mirror position of the optical cavity system in the initial state, the optical path length in the initial state, the power output of the laser tuning unit (laser power), and relevant environmental parameters (such as temperature, humidity, etc.) to ensure conditions such as the stability of the optical cavity resonance in the initial state.

[0071] Steps S1 - S3 are the modulation of the three-mirror cavity itself, similar to the zeroing and inspection functions. At this time, the auxiliary micro torsion balance has not been introduced.

[0072] S4. Obtain the initial state record and detection data of the optical cavity state, place the auxiliary micro torsion balance inside the optical cavity, automatically calibrate the laser frequency according to the mirror adjustment, and perform the second optical path and laser intensity adjustment. Record the new resonance state of the optical cavity and the mirror position, and transmit them to the processing unit at the same time.

[0073] In step S4, the auxiliary micro torsion balance is regarded as a mirror, replacing one of the mirrors in steps S1 - S3. Combining the angles adjusted by the torsion balance and the concave mirror, automatically calibrate the laser frequency, adjust the incident angle and intensity of light, so that the laser can continue to maintain the resonance state inside the optical cavity under the new adjustment.

[0074] The data recorded in step S4 includes: the new resonance state of the optical cavity after the auxiliary micro torsion balance is placed inside the optical cavity, the new positions of the mirrors (one is the concave mirror placed on the displacement stage, and the other is the reflecting surface formed by coating on the auxiliary micro torsion balance), the incident angle of the laser, the laser intensity, the environmental conditions inside the optical cavity (temperature, pressure, etc.), and the new optical path length. As Figure 1 shown, there are three segments in the optical path of the resonant cavity, and the length of the resonant cavity is equal to .

[0075] For the precise control and measurement of the vibration frequency of the torsion balance, the optical force coupling relationship between the optical cavity system and the torsion balance satisfies:

[0076]

[0077] where is the torque received by the torsion balance, is the optical spring coefficient, is the torsion angle of the auxiliary micro torsion balance.

[0078] According to the calculation of the beam matrix, we get:

[0079]

[0080] where is the circulating laser power inside the cavity, is the speed of light, is the distance between the torsion balance and the concave mirror, is half of the distance between the planar beam splitter and the torsion balance, is the radius of curvature of the concave mirror.

[0081] It should be noted that is the optical spring coefficient, which describes the laser-induced optical restoring force, that is, when the light pressure acts on the torsion balance, the additional restoring torque generated by the optical cavity structure. Its mathematical form is usually related to the optical power, incident angle, and optical cavity characteristics, and can be used to adjust the effective stiffness of the torsion balance, causing its resonance frequency to change. When the motion frequency of the auxiliary micro torsion balance is lower than that of the target micro torsion balance, it means that its effective restoring force is smaller, resulting in a lower natural frequency. In this application, by increasing , it is equivalent to applying an additional optical spring effect to increase the equivalent stiffness of the torsion balance, thereby increasing its natural frequency and making it closer to or reach the motion frequency of the target micro torsion balance.

[0082] In the experiment, the photons of the input laser enter the cavity after a certain proportion of attenuation. When the system is stable, the average power inside the cavity is:

[0083]

[0084] where is the circulating cavity length, , is the angular frequency of the input laser, is the resonant frequency of the cavity, is the coupling coefficient of the cavity, is the attenuation rate, is the incident laser power.

[0085] S5. Calculate the change in the optical force inside the detected optical cavity, and in combination with the resonance state adjustment of the optical cavity system, detect in real time through the processing unit the influence of the optical pressure on the micro torsion balance resonance system, and reflect the position and angle changes of the target micro torsion balance in the optical cavity in combination with the optical cavity tuning state.

[0086] S6. According to the detected angles and positions of the target micro torsion balance, adjust the positions of the mirrors of the optical cavity, and in combination with the mirror commissioning data recorded by the optical cavity system, optimize the precise commissioning of the concave mirror and the auxiliary micro torsion balance mirror through the feedback control system.

[0087] S7. According to the feedback control and the resonance frequency tuning of the optical cavity system, record in real time the resonance behavior of the micro torsion balance, and in combination with the frequency-modulated laser frequency data of the optical cavity, invert the specific response and position changes of the frequency-modulated micro torsion balance in the optical cavity.

[0088] Since the magnitude of the resonance frequency inside the optical cavity determines the magnitude of the optical force acting on the auxiliary micro torsion balance, the specific response and position changes of the frequency-modulated micro torsion balance in the optical cavity can be inverted through the laser frequency change of the optical cavity and the following angle-torque transfer function formula.

[0089] The resonance behavior of the micro torsion balance (such as resonance frequency, amplitude, etc.), the laser frequency data after frequency modulation of the optical cavity, the specific response of the micro torsion balance in the optical cavity, the position change and angle change of the micro torsion balance recorded in real time in step S7.

[0090] Under the combined action of the optical elastic coefficient and the external torque N , the motion equation of the auxiliary micro torsion balance is:

[0091]

[0092] where is the moment of inertia of the micro torsion balance, is the torsional angle of the auxiliary micro torsion balance, is the velocity damping factor, is the elastic coefficient of the torsion wire, is the imaginary number, is the loss angle.

[0093] After Fourier transform, we get:

[0094]

[0095] Among them, is the angular frequency of motion, is the velocity damping factor, is the eigenfrequency of the micro torsion balance, .

[0096] The angle-momentum transfer function of the system is:

[0097]

[0098] Among them, is the function of the angle of the system in the frequency domain, is the function of the torque of the system in the frequency domain.

[0099] S8. Use a laser displacement sensor to measure the effect to be measured.

[0100] When the laser displacement sensor detects that the micro torsion balance resonance system resonates, at this time, the motion equation of the target micro torsion balance satisfies:

[0101]

[0102] Among them, is the moment of inertia of the micro torsion balance; is the velocity damping factor; k is the elastic coefficient of the torsion wire; is the driving torque, is the external driving force of the angular frequency, is the motion time of the target micro torsion balance, is the external driving force of the phase angle.

[0103] At this time, the amplitude of the target micro torsion balance resonance is:

[0104]

[0105] Among them, is the velocity damping factor.

[0106] When the resonance amplitude A satisfies the detection lower limit of the detector, it can be used to detect other effects to be measured of the target micro torsion balance.

[0107] It should be understood that expressions such as "including" and "may include" that can be used in this application indicate the existence of disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or a combination thereof, but cannot be interpreted as excluding the existence or possibility of addition of one or more other characteristics, numbers, operations, constituent elements, components, or a combination thereof.

[0108] In addition, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" can include A, can include B, or can include both A and B.

[0109] The orientation terms mentioned in the embodiments of this application, such as "top", "bottom", "inside", "outside", "left", "right", etc., are only with reference to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer illustration and understanding of the embodiments of this application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the embodiments of this application.

[0110] In addition, in the embodiments of this application, mathematical concepts such as symmetry, equality, parallelism, perpendicularity, etc. are mentioned. These limitations are all in view of the current technological level, rather than absolute strict definitions in the mathematical sense, allowing for a small amount of deviation. Approximations to symmetry, equality, parallelism, perpendicularity, etc. are all acceptable. For example, A is parallel to B means that A is parallel to B or approximately parallel to B, and the included angle between A and B can be between 0 degrees and 10 degrees. A is perpendicular to B means that A is perpendicular to B or approximately perpendicular to B, and the included angle between A and B can be between 80 degrees and 100 degrees.

[0111] As described above, the above are only the specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. A micro torsion balance effect amplification device based on resonance regulation, characterized in that Including: A laser, a planar beam splitter, a concave mirror, an auxiliary torsion balance, an optical path adjustment component, and an optical intensity adjustment component; The auxiliary torsion balance is composed of a test mass suspended by a suspension wire, and a reflective film is plated on one side of the test mass; The laser is used to emit laser light and irradiate the planar beam splitter; The planar beam splitter, the test mass, and the concave mirror are arranged in sequence along the optical path to form a three-mirror ring cavity; The optical path adjustment component is used to change the position of at least one of the planar beam splitter, the test mass, and the concave mirror to change the resonant cavity length of the three-mirror ring cavity; The optical intensity adjustment component is used to change the incident optical power of the incident optical signal of the laser; The optical path adjustment component and the optical intensity adjustment component cooperate to cause optical resonance to occur in the three-mirror ring cavity, generating an optical pressure acting on the test mass in the auxiliary torsion balance. The optical pressure causes the suspension wire in the auxiliary torsion balance to twist, and the magnitude of the optical pressure ensures that the movement frequencies of the auxiliary torsion balance and the target torsion balance are the same and mechanical resonance occurs.

2. The amplifying device according to claim 1, characterized in that, The amplification device further includes a photodetector for real-time monitoring of the light intensity at the output end of the three-mirror ring cavity. When the light intensity reaches a peak value, it indicates that optical resonance has occurred in the three-mirror ring cavity.

3. The amplifying device according to claim 1, characterized in that, The amplification device further includes a laser displacement sensor for detecting the displacement change of the target torsion balance. When the displacement amplitude reaches a peak value, it indicates that mechanical resonance has occurred between the auxiliary torsion balance and the target torsion balance.

4. The amplifying device according to claim 1, wherein The concave mirror supports torsion to change the reflection angle and focal position of the light beam in the three-mirror ring cavity.

5. The amplifying device according to claim 1, wherein In the three-mirror ring cavity, the mirror surface material is selected as a silver-plated lens, and the reflectivity is greater than 99.99%.

6. The amplifying device according to claim 1, wherein, The amplification device further includes a plurality of spare auxiliary torsion balances and supports the replacement of the auxiliary torsion balance to be as consistent with the target torsion balance as possible.

7. The amplifying device according to claim 1, wherein The optical path adjustment component changes the resonant cavity length of the three-mirror ring cavity in at least one of the following ways: (1) Changing the distance between the planar beam splitter and the test mass; (2) Changing the distance between the test mass and the concave mirror; (3) Changing the radius of curvature of the concave mirror.

8. A method for amplifying the microtorsion balance effect based on resonance regulation, characterized in that, This method is applied to the amplification device according to any one of claims 1 to 7. This method includes: S1. Changing the optical power of the incident optical signal and / or the resonant cavity length of the three-mirror ring cavity to cause optical resonance to occur in the three-mirror ring cavity, generating an optical pressure acting on the test mass. The optical pressure causes the suspension wire to twist; S2. Repeatedly performing step S1 until the magnitude of the generated optical pressure ensures that the movement frequencies of the auxiliary torsion balance and the target torsion balance are the same and mechanical resonance occurs.

9. The amplification method according to claim 8, characterized in that, Changing the resonant cavity length of the three-mirror ring cavity, the specific method is as follows: Adjust the position of the concave mirror so that it moves on the perpendicular bisector of the planar beam splitter and the test mass until optical resonance occurs.

10. The amplification method according to claim 8, characterized in that, During operation, the distance between the auxiliary torsion balance and the target torsion balance is small enough to ensure mechanical coupling; the two are placed coplanarly and have the same vibration direction.

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