Methods and apparatus for signal measurement based on the characteristics of intermittent chaos

Abstract

This invention discloses a method and apparatus for signal measurement based on the characteristics of intermittent chaos. The method includes: acquiring an electrical signal converted from a laser signal modulated by an external signal to be measured, and detecting the broadening data of the main peak signal spectral line in the frequency domain data of the electrical signal to obtain a broadening detection result; acquiring time domain data of the electrical signal based on the broadening detection result, and obtaining a three-dimensional phase space based on the time domain data; performing an intersection operation between a fixed plane and the three-dimensional phase space to obtain a Poincaré cross section composed of multiple discrete intercept points; constructing an iterative graph composed of iteration points based on the Poincaré cross section, and obtaining the change in the external signal to be measured by calculating the minimum width and area of ​​the channel in the iterative graph; wherein the channel is formed by the trajectory of the iteration points and the diagonal. This invention provides a new detection mechanism for the field of signal measurement, improving the accuracy and sensitivity of signal measurement.

Description

Technical Field

[0001] This invention relates to the field of photoelectric signal measurement, and in particular to a method and apparatus for signal measurement based on the characteristics of intermittent chaos. Background Technology

[0002] In the field of photoelectric signal measurement, a novel nonlinear measurement mechanism has been introduced. When a signal is detected, the system state transitions from periodic to intermittent chaos. By utilizing the abrupt changes in the response signal, high-precision and high-sensitivity measurement of the signal can be achieved. Existing photoelectric signal measurement methods are mainly based on linear methods, such as mode shifting, mode broadening, and mode splitting. Based on the principle of linear change, these methods suffer from low measurement accuracy and sensitivity. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, this invention proposes a method for signal measurement based on the characteristics of intermittent chaos. Based on the intermittent chaos mechanism and its characteristic indicators, the accuracy and sensitivity of signal measurement are improved.

[0005] Another object of the present invention is to provide a system for signal measurement based on the characteristics of intermittent chaos.

[0006] The third objective of this invention is to provide a device for signal measurement based on the characteristics of intermittent chaos.

[0007] To achieve the above objectives, the present invention proposes a method for signal measurement based on the characteristics of intermittent chaos, comprising:

[0008] The electrical signal converted from the laser signal modulated by the external signal to be tested is acquired, and the broadening data of the main peak signal spectral line in the frequency domain data of the electrical signal is detected to obtain the broadening detection result.

[0009] Based on the broadening detection results, time-domain data of the electrical signal is obtained, and a three-dimensional phase space is obtained based on the time-domain data;

[0010] A Poincaré section composed of multiple discrete intercept points is obtained by performing an intersection operation between a fixed plane and the three-dimensional phase space.

[0011] An iterative graph consisting of iterative points is constructed based on the Poincaré cross section, and the change in the external signal to be measured is obtained by calculating the minimum width and area of ​​the channel in the iterative graph; wherein the channel is formed by the trajectory of the iterative points and the diagonal.

[0012] The signal measurement method based on the characteristics of intermittent chaos in this invention may also have the following additional technical features:

[0013] In one embodiment of the present invention, the time-domain data includes a time dimension and a signal amplitude dimension.

[0014] In one embodiment of the present invention, obtaining a three-dimensional phase space based on the time-domain data includes:

[0015] Differential signals are obtained by performing differential processing on the amplitude dimension of the signal;

[0016] The three-dimensional phase space is constructed by using the time dimension, the signal amplitude dimension, and the differential signal as coordinate axes.

[0017] In one embodiment of the present invention, the coordinate axes of the Poincaré section correspond to the time dimension and the signal amplitude dimension, respectively.

[0018] In one embodiment of the present invention, constructing an iterative graph composed of iteration points based on the Poincaré section includes:

[0019] The amplitude of the first intercept point in the Poincaré section is used as the first coordinate axis;

[0020] The amplitude of the second intercept point in the Poincaré section is used as the second coordinate axis;

[0021] An iterative graph consisting of iterative points is constructed based on the first coordinate axis and the second coordinate axis; wherein, the iterative point includes the magnitude of the first intercept point and the magnitude of the second intercept point.

[0022] To achieve the above objectives, another aspect of the present invention proposes a system for signal measurement based on the characteristics of intermittent chaos, comprising:

[0023] The spectral line broadening detection module is used to acquire the electrical signal converted from the laser signal modulated by the external signal to be tested, and to detect the broadening data of the main peak signal spectral line in the frequency domain data of the electrical signal to obtain the broadening detection result.

[0024] A three-dimensional space construction module is used to obtain time-domain data of electrical signals based on the broadening detection results, and to obtain a three-dimensional phase space based on the time-domain data;

[0025] The planar intersection operation module is used to perform intersection operations between a fixed plane and the three-dimensional phase space to obtain a Poincaré section composed of multiple discrete intercept points;

[0026] The signal change detection module is used to construct an iterative graph composed of iterative points based on the Poincaré cross section, and to obtain the change in the external signal to be measured by calculating the minimum width and area of ​​the channel in the iterative graph; wherein the channel is formed by the trajectory of the iterative points and the diagonal.

[0027] To achieve the above objectives, a third aspect of this application provides an apparatus for signal measurement based on the characteristics of intermittent chaos, comprising:

[0028] A tunable laser is used to generate a laser signal that is not modulated by an external signal to be measured.

[0029] Fiber optic isolators are used to isolate laser signals reflected in the optical path from entering a tunable laser.

[0030] Fiber optic amplifiers are used to amplify the power of laser signals being measured.

[0031] A polarization controller is used to adjust the polarization characteristics of the laser signal being measured.

[0032] An optical microcavity is used to receive laser signals measured at the front end. As a sensitive element, it receives modulation of the external signal to be measured, and performs mutual coupling between the optical field and the mechanical field, so that the mechanical field in a periodic state is transformed into an intermittent chaotic state, and modulates the laser signal to output the laser signal in an intermittent chaotic state.

[0033] A photodetector is used to convert laser signals in a state of intermittent chaos into electrical signals.

[0034] An oscilloscope is used to acquire the time-domain data of the electrical signal;

[0035] A spectrum analyzer is used to collect frequency domain data of the electrical signal.

[0036] The method, system, and apparatus for signal measurement based on the characteristics of paroxysmal chaos in this invention provide a new detection mechanism for the field of signal measurement based on the mechanism of paroxysmal chaos and its characteristic indicators, thereby improving the accuracy and sensitivity of signal measurement.

[0037] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 This is an architecture diagram of a method for signal measurement based on the characteristics of intermittent chaos according to an embodiment of the present invention;

[0040] Figure 2 This is a structural diagram of a whispering-gallery mode optical micro-ring cavity according to an embodiment of the present invention;

[0041] Figure 3This is a time-domain signal diagram of periodic state and intermittent chaotic state according to an embodiment of the present invention;

[0042] Figure 4 This is a frequency domain signal diagram of the periodic state and the intermittent chaotic state according to an embodiment of the present invention;

[0043] Figure 5 This is a phase space diagram of periodic states and intermittent chaotic states according to an embodiment of the present invention;

[0044] Figure 6 These are Poincaré cross-sectional diagrams of periodic states and intermittent chaotic states according to embodiments of the present invention;

[0045] Figure 7 It is an iterative diagram of periodic states and intermittent chaotic states according to an embodiment of the present invention;

[0046] Figure 8 It is the minimum width and area graph of the iterative graph according to an embodiment of the present invention;

[0047] Figure 9 This is a system structure diagram for signal measurement based on the characteristics of intermittent chaos according to an embodiment of the present invention;

[0048] Figure 10 This is a structural diagram of a device for signal measurement based on the characteristics of intermittent chaos according to an embodiment of the present invention. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0051] The following describes, with reference to the accompanying drawings, a method, system, and apparatus for signal measurement based on the characteristics of intermittent chaos according to embodiments of the present invention.

[0052] Figure 1 This is an architecture diagram of a method for signal measurement based on the characteristics of intermittent chaos according to an embodiment of the present invention.

[0053] like Figure 1 As shown, the method includes, but is not limited to, the following steps:

[0054] S1, acquire the electrical signal converted from the laser signal modulated by the external signal to be tested, and detect the broadening data of the main peak signal spectral line in the frequency domain data of the electrical signal to obtain the broadening detection result;

[0055] S2, based on the broadening detection results, obtain the time-domain data of the electrical signal, and obtain the three-dimensional phase space based on the time-domain data;

[0056] S3, using the intersection operation between a fixed plane and three-dimensional phase space to obtain a Poincaré section composed of multiple discrete intercept points;

[0057] S4. Based on the Poincaré section, an iterative graph composed of iterative points is constructed, and the change in the external signal to be measured is obtained according to the minimum width and area of ​​the channel in the iterative graph; wherein, the channel is formed by the trajectory of the iterative points and the diagonal.

[0058] Intermittent chaos, as we understand it, refers to a type of signal where, over time, the system state alternates between periodic and chaotic motion. In the frequency domain, the spectrum of periodic motion consists of a single discrete main peak signal and its harmonics, while the spectrum of intermittent chaotic motion shows broadening of the spectral lines of the main peak signal and its harmonics. Intermittent chaos exists in physical systems such as fluids, lasers, circuits, plasmas, artificial neurons, gene circuits, superlattices, and pulsars. As the parameters of a physical system change, its evolutionary state changes from a periodic state to an intermittent chaotic state, and the magnitude of the change in system parameters affects the characteristic indicators of intermittent chaos. When a physical system is affected by external signals, its parameters change, thus affecting the characteristic indicators of intermittent chaos. After establishing a mapping relationship between external signals and the characteristic indicators of intermittent chaos, this mapping relationship can be used to measure external signals.

[0059] Whispering-gallery mode optical micro-ring cavities possess advantages such as high optical quality factor and small mode volume, exhibiting high sensitivity to external influences and possessing significant research value and broad market prospects in the sensing field. Paroxysmal chaos can also occur in optomechanical systems based on whispering-gallery mode optical micro-ring cavities. By using the micro-ring cavity as a sensing element to receive the influence of external signals and analyzing the characteristic indices of paroxysmal chaos in the output optical field of the micro-ring cavity, the measurement of external signals can be achieved. External incident laser light enters the micro-ring cavity through evanescent field coupling of a tapered fiber. The light propagates around the circumference of the cavity wall via total internal reflection, existing stably in space as a standing wave. Due to the optical pressure, a force is exerted on the cavity wall, causing mechanical displacement. This mechanical displacement changes the size of the optical cavity, affecting the frequency and intensity of the standing wave optical field. In this process, the optical field and mechanical displacement within the cavity couple with each other, forming a nonlinear system with a coupled optical mode and a coupled mechanical mode. When external signals such as temperature or ultrasound are applied to the micro-ring cavity, changes in system parameters such as the laser power input to the micro-ring cavity, the frequency detuning between the intracavity optical field and the external laser, and the dissipation rate of the micro-ring cavity will cause the mechanical mode to change from a periodic state to a paroxysmal chaotic state. The mechanical mode modulates the coupled optical mode, causing the output optical field of the micro-ring cavity to also change from a periodic state to a paroxysmal chaotic state. After being converted into an electrical signal by a subsequent photodetector, it is used for further analysis and processing.

[0060] In one embodiment of the present invention, such as Figure 1 As shown, the method for signal measurement based on the characteristics of intermittent chaos of the present invention may include the following steps:

[0061] 1. Acquire frequency domain data: Acquire the frequency domain data of the output signal of the measuring device;

[0062] 2. Spectral line broadening: Determine if the main peak signal spectral line in the frequency domain data has broadened. If the main peak signal spectral line has not broadened, it means the signal has not been detected; if the main peak signal spectral line has broadened, proceed to the next step of analysis.

[0063] 3. Acquire time-domain data: Acquire time-domain data of the output signal of the measuring device. The time-domain data includes two dimensions: time t and signal amplitude A. Normalize the signal amplitude A.

[0064] 4. Three-dimensional phase space: Differentiate the signal amplitude A to obtain the differential signal dA. Plot the three-dimensional phase space using time t, signal amplitude A, and amplitude difference dA as the x, y, and z coordinate axes, respectively.

[0065] 5. Poincaré Section: By performing an intersection operation between a fixed plane z = 0 and the three-dimensional phase space, a Poincaré section composed of multiple discrete intercept points [i, A(i)] is obtained. The x-axis of the Poincaré section corresponds to the time dimension, and the y-axis corresponds to the signal amplitude dimension, where the amplitude of the intercept point is labeled A(i).

[0066] 6. Iteration graph: Using the amplitude A(i) of the i-th intercept point as the x-axis and the amplitude A(i+1) of the (i+1)-th intercept point as the y-axis, draw an iteration graph consisting of iteration points [A(i), A(i+1)]. The trajectory of the iteration points will form a channel with the diagonal.

[0067] 7. Calculate characteristic indicators: Calculate the minimum width and area of ​​the channel in the iterative graph. Based on the size of the minimum width and area, the change in the external signal to be measured can be obtained.

[0068] Specifically, in dynamical systems theory, phase diagrams are used to represent all possible states of a system, with each specific state corresponding one-to-one with a specific point in the phase diagram. Figure 1Generally, a phase space includes two coordinate dimensions: amplitude and amplitude difference. Here, a time coordinate is added, and the amplitude is normalized. The three dimensions of time t, signal amplitude A, and amplitude difference dA are plotted as x, y, and z axes, respectively, to create a three-dimensional phase space. For periodic motion, the graph in phase space also exhibits a periodic state. With the evolution of time, each period represents a time shift of the phase space graph from the previous period. However, intermittent chaotic motion does not have this characteristic. To facilitate subsequent data analysis, a Poincaré section is introduced to analyze the characteristics of intermittent chaos. Continuous data is discretized or sampled. A fixed plane z = 0 is used to perform an intersection operation with the three-dimensional phase space to obtain a Poincaré section composed of multiple discrete intercept points [i, A(i)]. The x-axis of the Poincaré section corresponds to the time dimension, and the y-axis corresponds to the signal amplitude dimension, where the amplitude of the intercept point is labeled A(i). For periodic motion, its Poincaré section is a straight line parallel to the x-axis. For intermittent chaotic motion, it is based on a straight line parallel to the x-axis, but also has a shape that juts out towards the y-axis. Using the amplitude A(i) of the i-th intercept point as the x-axis and the amplitude A(i+1) of the (i+1)-th intercept point as the y-axis, an iterative graph composed of iteration points [A(i), A(i+1)] is plotted in chronological order. For periodic motion, the iteration points are all located on the diagonal and coincide with each other, indicating that the system evolves consistently within each period. For intermittent chaotic motion, a channel exists between the line composed of discrete points in the iterative graph and the diagonal. The minimum width and area of ​​the channel are defined. The minimum width of the channel is the minimum distance between the curve fitted based on the iteration point and the diagonal. The area of ​​the channel is the area between the curve fitted based on the iteration point and the diagonal when the minimum distance is reached by extending a fixed normalized length in both directions. By calculating the minimum width and area of ​​the channel, the change in the measured signal can be obtained based on the size of the minimum width and area.

[0069] Figure 2 The structure of the whispering-gallery mode optical micro-ring cavity in this embodiment of the invention is as follows: Figure 2 As shown, the upper part is a cavity, r 1 ,r 2 These represent the inner and outer diameters of the cavity, respectively, with h being the cavity thickness, and the lower part serving as the supporting structure.

[0070] In whispering-gallery mode optics, the laser within the micro-ring cavity operates in a periodic state when no signal is detected, but enters a paroxysmal chaotic state when a signal is detected. Figure 3 In the 'a', the time-domain signal represents a periodic state. Figure 3 In this context, b represents the time-domain signal of the intermittent chaotic state.

[0071] In whispering-gallery mode optics, the laser within the micro-ring cavity operates in a periodic state when no signal is detected, but enters a paroxysmal chaotic state when a signal is detected. Figure 4 In this context, 'a' represents the frequency domain signal in a periodic state. Figure 4 In this context, b represents the frequency domain signal of the intermittent chaotic state.

[0072] In whispering-gallery mode optics, the laser within the micro-ring cavity operates in a periodic state when no signal is detected, but enters a paroxysmal chaotic state when a signal is detected. Figure 5 In this context, 'a' represents the phase space of the periodic state and the process of the fixed plane intersecting with the phase space. Figure 5 In this context, 'b' represents the phase space of the intermittent chaotic state and the process of the fixed plane intersecting with the phase space.

[0073] In whispering-gallery mode optics, the laser within the micro-ring cavity operates in a periodic state when no signal is detected, but enters a paroxysmal chaotic state when a signal is detected. Figure 6 In this context, 'a' represents the Poincaré section in a periodic state. Figure 6 In this context, b represents the Poincaré section in the intermittent chaotic state.

[0074] In whispering-gallery mode optics, the laser within the micro-ring cavity operates in a periodic state when no signal is detected, but enters a paroxysmal chaotic state when a signal is detected. Figure 7 In the diagram, 'a' represents the iterative graph of the periodic state. Figure 7 In the diagram, b represents the iterative graph of the intermittent chaotic state.

[0075] Figure 8 This diagram illustrates the calculation of the minimum width and area of ​​a channel using an iterative graph based on paroxysmal chaos. The minimum width of the channel is the minimum distance between the curve fitted to the iteration point and the diagonal. The area of ​​the channel is the area between the curve fitted to the iteration point and the diagonal when the iteration point corresponding to the minimum distance is extended to both sides by a fixed normalized length.

[0076] The signal measurement method based on the characteristics of paroxysmal chaos according to embodiments of the present invention provides a new detection mechanism for the field of signal measurement based on the paroxysmal chaos mechanism and its characteristic indicators, thereby improving the accuracy and sensitivity of signal measurement.

[0077] To achieve the above embodiments, such as Figure 9 As shown, this embodiment also provides a system 10 for signal measurement based on the characteristics of paroxysmal chaos. The system 10 includes a spectral line broadening detection module 100, a three-dimensional space construction module 200, a plane intersection operation module 300, and a signal change detection module 400.

[0078] The spectral line broadening detection module 100 is used to acquire the electrical signal converted from the laser signal modulated by the external signal to be measured, and to detect the broadening data of the main peak signal spectral line in the frequency domain data of the electrical signal to obtain the broadening detection result.

[0079] The three-dimensional space construction module 200 is used to acquire time-domain data of electrical signals based on the broadening detection results, and to obtain a three-dimensional phase space based on the time-domain data;

[0080] The planar intersection operation module 300 is used to perform intersection operations between a fixed plane and a three-dimensional phase space to obtain a Poincaré section composed of multiple discrete intercept points.

[0081] The signal change detection module 400 is used to construct an iterative graph composed of iterative points based on the Poincaré cross section, and to obtain the change in the external signal to be measured by calculating the minimum width and area of ​​the channel in the iterative graph; wherein, the channel is formed by the trajectory of the iterative points and the diagonal.

[0082] Furthermore, the time-domain data includes both the time dimension and the signal amplitude dimension; the aforementioned three-dimensional spatial construction module 200 is also used for:

[0083] Differential signals are obtained by differential processing of the signal amplitude dimension;

[0084] A three-dimensional phase space is constructed by using the time dimension, the signal amplitude dimension, and the differential signal as coordinate axes.

[0085] Furthermore, the coordinate axes of the Poincaré section correspond to the time dimension and the signal amplitude dimension, respectively.

[0086] Furthermore, the aforementioned signal change detection module 400 is also used for:

[0087] The amplitude of the first intercept point in the Poincaré section is used as the first coordinate axis;

[0088] The amplitude of the second intercept point in the Poincaré section is used as the second coordinate axis;

[0089] An iterative graph consisting of iterative points is constructed based on the first coordinate axis and the second coordinate axis; wherein, the iterative point includes the magnitude of the first intercept point and the magnitude of the second intercept point.

[0090] The system for signal measurement based on the characteristics of paroxysmal chaos according to embodiments of the present invention provides a new detection mechanism for the field of signal measurement based on the paroxysmal chaos mechanism and its characteristic indicators, thereby improving the accuracy and sensitivity of signal measurement.

[0091] To achieve the above embodiments, such as Figure 10 As shown, this embodiment also provides a device for signal measurement based on the characteristics of intermittent chaos, including:

[0092] Tunable laser 20 is used to generate a laser signal that is not modulated by an external signal to be measured;

[0093] Fiber optic isolator 30 is used to isolate the laser signal reflected in the optical path from entering the tunable laser;

[0094] Fiber optic amplifier 40 is used to amplify the power of the laser signal being measured;

[0095] Polarization controller 50 is used to adjust the polarization characteristics of the laser signal being measured;

[0096] The optical microcavity 60 is used to receive the laser signal measured by the front end, and as a sensitive element, it accepts the modulation of the external signal to be measured, performs mutual coupling between the optical field and the mechanical field, so that the mechanical field in the periodic state is transformed into the intermittent chaotic state, and modulates the laser signal to output the laser signal in the intermittent chaotic state.

[0097] Oscilloscope 70 is used to acquire time-domain data of electrical signals;

[0098] Photodetector 80 is used to convert laser signals in a state of intermittent chaos into electrical signals;

[0099] The spectrum analyzer 90 is used to acquire frequency domain data of electrical signals.

[0100] The device for signal measurement based on the characteristics of paroxysmal chaos according to embodiments of the present invention provides a new detection mechanism for the field of signal measurement based on the paroxysmal chaos mechanism and its characteristic indicators, thereby improving the accuracy and sensitivity of signal measurement.

[0101] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0102] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A method for signal measurement based on the characteristics of intermittent chaos, characterized in that, The method includes the following steps: The electrical signal converted from the laser signal modulated by the external signal to be tested is acquired, and the broadening data of the main peak signal spectral line in the frequency domain data of the electrical signal is detected to obtain the broadening detection result. Based on the broadening detection results, time-domain data of the electrical signal is obtained, and a three-dimensional phase space is obtained based on the time-domain data; wherein, the time-domain data includes a time dimension and a signal amplitude dimension; obtaining the three-dimensional phase space based on the time-domain data includes: performing differential processing on the signal amplitude dimension to obtain a differential signal, and constructing a three-dimensional phase space using the time dimension, the signal amplitude dimension, and the differential signal as coordinate axes; A Poincaré cross section composed of multiple discrete intercept points is obtained by performing an intersection operation between a fixed plane and the three-dimensional phase space; wherein the coordinate axes of the Poincaré cross section correspond to the time dimension and the signal amplitude dimension, respectively. Constructing an iterative graph composed of iterative points based on the Poincaré cross section includes: using the amplitude of the first intercept point in the Poincaré cross section as the first coordinate axis, using the amplitude of the second intercept point in the Poincaré cross section as the second coordinate axis, and constructing an iterative graph composed of iterative points based on the first and second coordinate axes; and obtaining the change in the external signal to be measured by calculating the minimum width and area of ​​the channel in the iterative graph; wherein, the iterative points include the amplitude of the first intercept point and the amplitude of the second intercept point, the channel is formed by the trajectory of the iterative points and the diagonal, the minimum width is the minimum distance between the curve fitted based on the iterative points and the diagonal, and the area is the area between the curve fitted and the diagonal when the iterative points corresponding to the minimum distance are extended to both sides by a fixed normalized length.

2. A device for signal measurement based on the characteristics of intermittent chaos, used to implement the method of claim 1, characterized in that, include: A tunable laser is used to generate a laser signal that is not modulated by an external signal to be measured. Fiber optic isolators are used to isolate laser signals reflected in the optical path from entering a tunable laser. Fiber optic amplifiers are used to amplify the power of laser signals being measured. A polarization controller is used to adjust the polarization characteristics of the laser signal being measured. An optical microcavity is used to receive laser signals measured at the front end. As a sensitive element, it receives modulation of the external signal to be measured, and performs mutual coupling between the optical field and the mechanical field, so that the mechanical field in a periodic state is transformed into an intermittent chaotic state, and modulates the laser signal to output the laser signal in an intermittent chaotic state. A photodetector is used to convert laser signals in a state of intermittent chaos into electrical signals. An oscilloscope is used to acquire the time-domain data of the electrical signal; A spectrum analyzer is used to collect frequency domain data of the electrical signal.

3. A system for signal measurement based on the characteristics of intermittent chaos, characterized in that, include: The spectral line broadening detection module is used to acquire the electrical signal converted from the laser signal modulated by the external signal to be tested, and to detect the broadening data of the main peak signal spectral line in the frequency domain data of the electrical signal to obtain the broadening detection result. A three-dimensional space construction module is used to acquire time-domain data of electrical signals based on the broadening detection results, and to obtain a three-dimensional phase space based on the time-domain data; wherein, the time-domain data includes a time dimension and a signal amplitude dimension; obtaining a three-dimensional phase space based on the time-domain data includes: performing differential processing on the signal amplitude dimension to obtain a differential signal, and constructing a three-dimensional phase space using the time dimension, the signal amplitude dimension, and the differential signal as coordinate axes; The planar intersection operation module is used to perform intersection operations between a fixed plane and the three-dimensional phase space to obtain a Poincaré cross section composed of multiple discrete intercept points; wherein the coordinate axes of the Poincaré cross section correspond to the time dimension and the signal amplitude dimension, respectively; A signal change detection module is used to construct an iterative graph composed of iterative points based on the Poincaré cross section, including: using the amplitude of a first intercept point in the Poincaré cross section as a first coordinate axis, using the amplitude of a second intercept point in the Poincaré cross section as a second coordinate axis, constructing an iterative graph composed of iterative points based on the first and second coordinate axes; and obtaining the change in the external signal to be measured by calculating the minimum width and area of ​​the channel in the iterative graph; wherein, the iterative points include the amplitudes of the first and second intercept points, the channel is formed by the trajectory of the iterative points and the diagonal, the minimum width is the minimum distance between the curve fitted based on the iterative points and the diagonal, and the area is the area between the curve fitted and the diagonal when the iterative points corresponding to the minimum distance are extended to both sides by a fixed normalized length.

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