A method for improving the measurement accuracy of current transformer

Abstract

The present invention discloses a method for enhancing the measurement accuracy of a current transformer, and measures a magnetic field in an optically amplified compressed light source environment; wherein the optically amplified compressed light source includes: measuring an initial compressed light source to obtain a measurement result of an input state and an original probability distribution; judging the input state to determine the probability distribution of the measurement result of the input state; performing post-signal selection processing on the measurement result of the input state based on a Gaussian filter function to obtain a reference probability distribution function; calculating the mean of the probability distribution and the variance of the probability distribution to obtain a signal-to-noise ratio of the input state after low-noise amplification. For the input state of the magnetic field, the present invention uses an optically amplified compressed light source to measure the magnitude of the magnetic field, which further reduces noise interference, makes the measurement of magnetic field changes more accurate, and makes the measurement of corresponding current changes more flexible and accurate.

Description

Technical Field

[0001] The invention relates to a method for enhancing the measurement accuracy of a current transformer, and belongs to the technical field of quantum precision measurement. Background Art

[0002] Precision measurement technology plays a vital role in the field of information and communication. With the development of technologies such as 5G, Beidou and Energy Internet, the market for high-precision sensors and related sensor chips for positioning and communication vehicles has expanded rapidly, and the demand for measurement has increased dramatically. The accuracy of traditional measurement technology is affected by factors such as diffraction limit and shot noise, and the measurement accuracy cannot meet the needs of power applications. Quantum precision measurement mainly uses the characteristics of quantum itself to obtain higher measurement performance.

[0003] Quantum measurement technology uses specific quantum systems such as atoms, ions and photons to interact with physical quantities such as magnetic fields, electric fields and gravitational fields to change the quantum state of the unit to be measured. Through the reading of quantum states and data post-processing, ultra-high precision detection of physical quantities such as magnetic fields, electric fields and gravitational fields is achieved. The basic steps include: quantum state initialization, interaction with the physical quantity to be measured, reading of the final quantum state and result processing. Among them, the initialization of the quantum state is to initialize the state of the unit to be measured through a control signal; after interacting with the physical quantities to be measured such as magnetic fields, electric fields and gravitational fields, the quantum state of the unit to be measured will change, thereby changing the quantum state of the unit to be measured. Finally, the measurement results are converted into traditional photoelectric signal output to obtain the final measurement value. According to the application of quantum characteristics, quantum measurement can be divided into three types of quantum measurement technologies: based on quantum energy level transitions, based on quantum coherence, and based on quantum entanglement.

[0004] However, quantum measurement technology is subject to the Heisenberg limit, and its measurement accuracy and sensitivity need to be further improved. Among them, measurement signal noise has always been the biggest problem hindering the improvement of measurement accuracy. How to reduce signal noise is the key to enhancing the accuracy of quantum precision measurement. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method for enhancing the measurement accuracy of a current transformer. The use of an optically amplified compressed light source can well solve the noise limitation of measuring magnetic field physical quantities and further improve the detection sensitivity of the current transformer.

[0006] To achieve the above object, the present invention provides a method for enhancing the measurement accuracy of a current transformer, comprising:

[0007] Measuring magnetic fields in a light-amplified compressed light source environment;

[0008] Wherein, the optical amplification compression light source comprises:

[0009] Measure the initial squeezed light source and obtain the input state t n The measurement results and original probability distribution of

[0010] For input state t n Making a judgment to determine the probability distribution of the measurement results of the input state;

[0011] Based on the Gaussian filter function G(t n ), perform signal post-selection processing on the measurement results of the input state to obtain the benchmark probability distribution function Y(t n );

[0012] Calculate the base probability distribution function The mean and base probability distribution function of The variance of the input state t n The signal-to-noise ratio after low-noise amplification.

[0013] Preferably, for the input state t n Make a judgment and obtain the probability distribution of the measurement results of the input state, including:

[0014] When the input state is less than the reference parameter R s When, according to the probability distribution function y(t n ), get the new input state t n The probability distribution of the measurement results;

[0015] When the input state is greater than the reference parameter R s When the input state t n The measurement results maintain the original probability distribution.

[0016] Preferably, the probability distribution function y(t n )for:

[0017] ;

[0018] Among them, t0 is the input state t n The base amplitude, is the normalization coefficient.

[0019] Preferably, the base probability distribution function Y(t n )for:

[0020] ;

[0021] Where K is the input state t n Signal amplification generation probability.

[0022] Preferably, the Gaussian filter function G(t n )for:

[0023] ;

[0024] In the formula, R s is the reference parameter and A is the noise factor.

[0025] Preferably, A takes a value of 0.2, 0.5 or 1.0.

[0026] Preferably, the input state t n The signal amplification generation probability K is:

[0027] ;

[0028] Where g is the signal amplification factor.

[0029] Preferably, the input state t n The signal-to-noise ratio after low-noise amplification is:

[0030] .

[0031] First, measure the initial squeezed light source and obtain the input state t n ,include:

[0032] Select two conjugate light beams, the vacuum fluctuations of the light fields of the two conjugate light beams are consistent and the rise and fall amounts are equal;

[0033] Compressing the light field causes one of the light beams to collapse, resulting in a phase difference between the two conjugate light beams, while keeping the phase difference between the two conjugate light beams unchanged;

[0034] The two light beams are projected onto the nonlinear medium in the same direction to form a third light beam and obtain an initial compressed light source.

[0035] The photoelectric converter converts the initial compressed light source into an electrical signal in the form of an optical signal to obtain the input state t n .

[0036] The beneficial effects achieved by the present invention are:

[0037] The present invention utilizes the entanglement of quantum states, prepares an initial compressed light source in a current transformer application scenario, amplifies the optical signal of the prepared initial compressed light source, detects the quantum state of the magnetic field, and then converts the optical signal into an electrical signal, thereby forming a current value; the present invention uses an optically amplified compressed light source to well solve the noise limitation of measuring the physical quantity of the magnetic field, significantly reduces noise interference, improves the signal-to-noise ratio, obtains high-precision changes in the physical state of the magnetic field such as the energy level, phase and position, and makes the detection of magnetic field changes more accurate, further improving the detection sensitivity of the current transformer, thereby realizing accurate measurement of the physical quantity of the current. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a flow chart of the present invention;

[0039] Figure 2 It is a schematic diagram of the change of the Gaussian function curve of the present invention;

[0040] Figure 3 It is a schematic diagram of the change of the compression light source factor before and after the signal amplification of the present invention;

[0041] Figure 4 is a schematic diagram of the relationship between the signal-to-noise ratio and the compression light source factor of the present invention;

[0042] Figure 5 It is a schematic diagram of the relationship between the signal-to-noise ratio and the signal amplification factor of the present invention. DETAILED DESCRIPTION

[0043] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention.

[0044] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention, they are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0045] The quantum state is the state of particles in the quantum world, which can be represented by wave functions from a mathematical point of view. The quantum state has four basic characteristics: discreteness, randomness, superposition and entanglement. These characteristics are very different from our macroscopic world.

[0046] The entanglement of quantum states can be understood as follows: the entangled state is a special state of particles in the quantum world. When two quantum particles are in an entangled state, if one of the quantum states is measured and collapses, the other quantum state will also experience the same collapse. However, there is no interaction between the two quantum particles.

[0047] The measurement of quantum state is the physical result obtained by measuring the quantum state of matter, and the physical state changes and laws of matter are obtained. In the use scenario of current transformer as a measuring device, the present invention uses an optically amplified compressed light source to further reduce the noise of magnetic field measurement, thereby improving the accuracy of current measurement.

[0048] In the detection application scenario of current transformers, the entanglement of quantum states is used to measure the magnetic field as a quantum state. The initial light source for measurement is a compressed light source. By amplifying the optical signal of the compressed light source, the changes in the physical states of the magnetic field such as energy level, phase and position are obtained with high precision, thereby achieving accurate measurement of the physical quantity of current.

[0049] For the input state, there is a certain internal relationship between the compression light source factor before and after signal amplification. That is, the compression light source factor before signal amplification is positively correlated with the compression light source factor after signal amplification. However, when the compression light source factor before signal amplification is large enough, the compression light source factor after signal amplification theoretically tends to positive infinity. For a certain signal amplification factor, the compression light source factor needs to be within a certain range of action.

[0050] A method for enhancing the measurement accuracy of a current transformer, comprising:

[0051] Measuring magnetic fields in a light-amplified compressed light source environment;

[0052] Wherein, the optical amplification compression light source comprises:

[0053] Measure the initial squeezed light source and obtain the input state t n The measurement results and original probability distribution of

[0054] For input state t n Making a judgment to determine the probability distribution of the measurement results of the input state;

[0055] Based on the Gaussian filter function G(t n ), perform signal post-selection processing on the measurement results of the input state to obtain the benchmark probability distribution function Y(t n );

[0056] Calculate the base probability distribution function The mean and base probability distribution function of The variance of the input state t n The signal-to-noise ratio after low-noise amplification.

[0057] Furthermore, in this embodiment, the input state t n Make a judgment and obtain the probability distribution of the measurement results of the input state, including:

[0058] When the input state is less than the reference parameter R s When, according to the probability distribution function y(t n ), get the new input state t n The probability distribution of the measurement results;

[0059] When the input state is greater than the reference parameter R s When the input state t n The measurement results maintain the original probability distribution.

[0060] Furthermore, in this embodiment, the probability distribution function y(t n )for:

[0061]

[0062] Among them, t0 is the input state t n The base amplitude, is the normalization coefficient.

[0063] Furthermore, in this embodiment, the reference probability distribution function Y(t n )for:

[0064] ,

[0065] Where K is the input state t n Signal amplification generation probability.

[0066] Furthermore, in this embodiment, the Gaussian filter function G(t n )for:

[0067]

[0068] In the formula, R s is the reference parameter and A is the noise factor.

[0069] Furthermore, in this embodiment, the value of A is 0.2, 0.5 or 1.0.

[0070] Furthermore, in this embodiment, the input state t n The signal amplification generation probability K is:

[0071]

[0072] Where g is the signal amplification factor.

[0073] Furthermore, in this embodiment, the input state t n The signal-to-noise ratio after low-noise amplification is:

[0074] .

[0075] Furthermore, in this embodiment, the initial squeezed light source is measured to obtain the input state t n ,include:

[0076] Select two conjugate light beams, the vacuum fluctuations of the light fields of the two conjugate light beams are consistent and the rise and fall amounts are equal;

[0077] Compressing the light field causes one of the light beams to collapse, resulting in a phase difference between the two conjugate light beams, while keeping the phase difference between the two conjugate light beams unchanged;

[0078] The two light beams are projected onto the nonlinear medium in the same direction to form a third light beam and obtain an initial compressed light source.

[0079] The photoelectric converter converts the initial compressed light source into an electrical signal in the form of an optical signal to obtain the input state t n .

[0080] In the method of the present invention, the input state after the optical signal is amplified must meet the compressed light source condition, and then the measurement result of the input state is added with the Gaussian filter function to calculate the reference probability distribution function The mean and variance of , thus obtaining the signal-to-noise ratio of the input state after low-noise amplification. The baseline probability distribution function at this time is The invention has the advantage of noise removal by Gaussian filter function, and the quantum state measurement is more accurate. The invention utilizes the entanglement of magnetic field quantum state to obtain the relationship of physical state change such as phase more quickly, thereby realizing the accurate measurement of magnetic field.

[0081] Furthermore, the application scenario of the quantum precision measurement is a current transformer, which uses an optically amplified compressed light source to further reduce the noise of the magnetic field measurement, thereby improving the accuracy of the current measurement.

[0082] Furthermore, the physical principle of accurate magnetic field measurement utilizes the entanglement of quantum states, which can ensure the synchronization of quantum state changes and is precisely controllable.

[0083] Furthermore, the compressed light source preparation process includes:

[0084] Select two conjugate light beams, whose "vacuum fluctuations" of the light field are almost the same, and the rise and fall are equal. Compressing the light field causes one of the light beams to collapse, resulting in a phase difference between the two light beams, and keeping the phase difference unchanged. Then the two light beams are projected onto the nonlinear medium in the same direction to form a third light beam, which is called the initial compressed light source. The initial compressed light source prepared at this time has a noise characteristic lower than the shot noise benchmark, and is used as a good light source to improve the accuracy of quantum measurements.

[0085] The photoelectric converter converts the initial compressed light source into an electrical signal in the form of an optical signal to obtain the input state t n .

[0086] However, the initial compressed light source alone cannot completely improve the measurement accuracy. The initial compressed light source also needs to be amplified, which can improve the signal-to-noise ratio of the signal. However, traditional linear amplification may introduce new noise, causing secondary interference, thereby destroying the signal-to-noise ratio of the quantum state. For traditional communication networks, the input power of the optical signal can usually be increased to balance the noise power and thus improve the signal-to-noise ratio. But for quantum signals, simply increasing the optical input power cannot solve the actual problem.

[0087] Furthermore, the compressed light source optical signal amplification includes:

[0088] A low-noise amplification method is used to amplify the signal of the compressed light source. A Gaussian filter function is added during the signal amplification process for post-selective signal processing, ensuring that no additional noise interference is introduced during the signal amplification process, thereby fully improving the signal-to-noise ratio.

[0089] The low-noise compressed light source optical signal amplification method needs to combine the probability distribution function y(t n ) to determine the probability distribution of the measurement results of the input state. Then, by adding a Gaussian filter function to the measurement results of the input state, the signal-to-noise ratio of the input state after low-noise amplification can be calculated, which is the benchmark probability distribution function of the quantum state after the compressed light source is amplified. The details are as follows:

[0090] When the input state is less than the reference parameter When, according to the probability distribution function Get the probability distribution of the measurement results of the input state; when the input state is greater than the reference parameter When , the input state measurement results maintain the original probability distribution.

[0091] There are many types of the photoelectric converter and the current transformer in the prior art. Those skilled in the art can select a suitable type according to actual needs, and this embodiment will not give examples one by one.

[0092] For the low-noise compressed light source optical signal amplification method, the probability distribution function of the input state y(t n )for:

[0093]

[0094] Among them, t0 is the input state t n The base amplitude, is the normalization coefficient.

[0095] For input state t n The measurement result is added with Gaussian filter function G(t n ), and obtain the benchmark probability distribution function Y(t n ), the expression is as follows:

[0096] ,

[0097] Where K is the input state t n Signal amplification generation probability.

[0098]

[0099] In the above formula, is the reference parameter used to ensure the convergence of the Gaussian function. A is the noise factor. When A takes the values ​​of 0.2, 0.5, and 1.0, the Gaussian function The curve changes as Figure 2 shown.

[0100] K is the input state The signal amplification generation probability is expressed as follows:

[0101]

[0102] The input state Map to K and rescale. Where g is the signal amplification factor, and K is the input state after signal amplification.

[0103] In order to ensure that the input state after signal amplification meets the compressed light source condition, the probability distribution can be calculated based on the K function The mean and variance of the input state are calculated The signal-to-noise ratio after low-noise amplification.

[0104]

[0105] When the input state When in a coherent state, the compressed light source can be processed using low-noise amplification.

[0106] For input state , before and after signal amplification, there is a certain internal relationship between the compression light source factor V, such as Figure 3 As shown, the signal amplification factor g is 1.0, and the compressed light source factor V1 before signal amplification is positively correlated with the compressed light source factor V2 after signal amplification. However, when V1 is large enough, V2 theoretically tends to positive infinity. It can be seen that for a certain signal amplification factor, the compressed light source factor V needs to be within a certain range of action.

[0107] When the base amplitude When , the relationship between the signal-to-noise ratio SNR and the compressed light source factor V and the relationship between the signal-to-noise ratio SNR and the signal amplification factor g are calculated, as shown in Figure 4 and Figure 5 As shown in the figure, the signal amplification factor g has a certain threshold limit for compressed light source amplification. If the signal amplification factor g is too large, the signal-to-noise ratio SNR tends to positive infinity. Similarly, the value of the compressed light source factor V also needs to be controlled within a reasonable range. An excessively large compressed light source factor will cause the signal-to-noise ratio SNR to tend to positive infinity.

[0108] Therefore, the larger the signal-to-noise ratio, the smaller the noise of optical communication. For the input state of the magnetic field, the optical amplification and compression light source is used to measure the magnitude of the magnetic field, which further reduces noise interference, makes the measurement of magnetic field changes more accurate, and the measurement of corresponding current changes is also more flexible and accurate.

[0109] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for enhancing the measurement accuracy of a current transformer, characterized in that: include: Measuring magnetic fields in an optically amplified compressed light source environment; Wherein, the optically amplified compressed light source comprises: Measure the initial squeezed light source and obtain the input state t n The measurement results and original probability distribution of The initial compressed light source is obtained by processing two conjugate light beams; two conjugate light beams are selected, and the vacuum fluctuations of the light fields of the two conjugate light beams are consistent and the lifting and lowering amounts are equal; the light field is compressed to cause one of the light beams to collapse, so that a phase difference occurs between the two conjugate light beams, and the phase difference between the two conjugate light beams is kept unchanged; the two light beams are projected in the same direction onto a nonlinear medium to form the initial compressed light source; The input state t n The initial compressed light source is converted into an electrical signal in the form of an optical signal by a photoelectric converter; For input state t n Making a judgment to determine the probability distribution of the measurement results of the input state; The compressed light source is amplified based on the Gaussian filter function G(t n ), perform signal post-selection processing on the measurement results of the input state to filter out additional noise and obtain the benchmark probability distribution function ; Calculate the base probability distribution function The mean and base probability distribution function of The variance of the input state t n The signal-to-noise ratio after low-noise amplification.

2. A method for enhancing the measurement accuracy of a current transformer according to claim 1, characterized in that: For input state t n Make a judgment and obtain the probability distribution of the measurement results of the input state, including: When the input state is less than the reference parameter R s When, according to the probability distribution function y(t n ), get the new input state t n The probability distribution of the measurement results; When the input state is greater than the reference parameter R s When the input state t n The measurement results maintain the original probability distribution.

3. A method for enhancing the measurement accuracy of a current transformer according to claim 2, characterized in that: Probability distribution function y(t n )for: ； Among them, t0 is the input state t n The base amplitude, is the normalization coefficient.

4. A method for enhancing the measurement accuracy of a current transformer according to claim 3, characterized in that: Benchmark probability distribution function Y(t n )for: ； Where K is the input state t n Signal amplification generation probability.

5. A method for enhancing the measurement accuracy of a current transformer according to claim 4, characterized in that: Gaussian filter function G(t n )for: ； In the formula, R s is the reference parameter and A is the noise factor.

6. A method for enhancing the measurement accuracy of a current transformer according to claim 5, characterized in that: A takes values ​​of 0.2, 0.5 or 1.

0.

7. A method for enhancing the measurement accuracy of a current transformer according to claim 5, characterized in that: Input state t n The signal amplification generation probability K is: ； Where g is the signal amplification factor.

8. A method for enhancing the measurement accuracy of a current transformer according to claim 7, characterized in that: Input state t n The signal-to-noise ratio after low-noise amplification is: 。

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