Multi-channel heating current modulation method, system and device

Abstract

The invention relates to the technical field of heating circuits, and discloses a multi-channel heating current modulation method, system and device, and the heating current of each channel is mutually independent. The method comprises the steps of dynamically adjusting a current amplification gain of any channel according to initial temperature data and target temperature data of any channel to obtain an initial amplification gain; performing phase synchronization adjustment on the initial current signal of any channel according to the current signal of the reference channel to obtain a target current signal; according to the initial amplitude ratio signal and the actual amplitude ratio signal between any channel and the reference channel, carrying out coupling adjustment on the initial amplification gain of any channel to obtain a target amplification gain; and performing adaptive modulation on the heating current of any channel according to the target current signal and the target amplification gain to obtain a target heating current. The multi-channel atomic magnetometer has the beneficial effects that the loading capacity of the heating circuit module is improved, and the sensitivity of the multi-channel atomic magnetometer is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heating circuits, and in particular to a multi-channel heating current modulation method, system and device. Background Art

[0002] An atomic magnetometer is an instrument for measuring weak magnetic fields. Its core principle is to use pump light to pump atoms in an atomic gas chamber to a specific energy level, and measure the absorption or fluorescence changes of the atoms to light, thereby inferring the magnetic field strength within a certain range. During operation, the atomic magnetometer needs to heat the atomic gas chamber so that the alkali metal atoms in the atomic gas chamber evaporate into a gas state and maintain a constant atomic density at a stable temperature to support the atomic magnetometer's precise detection of quantum effects. For densely arranged multi-channel atomic magnetometer arrays, the related technology usually uses multiple heating circuit modules controlled in series to heat the atomic gas chambers separately to reduce the influence of the heating current in the heating circuit module on the sensitivity of the atomic magnetometer. However, the load capacity of the heating circuit module in the above scheme still needs to be improved. Summary of the invention

[0003] The present application provides a multi-channel heating current modulation method, system and device, which output independent heating currents to multiple channels respectively, and perform phase synchronization adjustment and coupling adjustment on the heating current of each channel, thereby achieving the technical effect of improving the load capacity of the heating circuit module and improving the sensitivity of the multi-channel atomic magnetometer.

[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include: In a first aspect, an embodiment of the present application provides a multi-channel heating current modulation method, wherein the heating currents of the channels are independent of each other; the method comprises: According to the initial temperature data and the target temperature data of any channel, dynamically adjusting the current amplification gain of any channel to obtain the initial amplification gain; Performing phase synchronization adjustment on the initial current signal of any of the channels according to the current signal of the reference channel to obtain a target current signal; wherein the reference channel is different from any of the channels; According to the initial amplitude ratio signal and the actual amplitude ratio signal between the any channel and the reference channel, coupling adjustment is performed on the initial amplification gain of the any channel to obtain a target amplification gain; wherein the initial amplitude ratio signal is obtained according to the initial amplification gains of the any channel and the reference channel respectively; The heating current of any one of the channels is adaptively modulated according to the target current signal and the target amplification gain to obtain a target heating current.

[0005] The multi-channel heating current modulation method proposed in the embodiment of the present application, by outputting independent heating currents to each channel respectively, and performing phase synchronization adjustment and coupling adjustment on the heating current of each channel, thereby eliminating the magnetic field projection error between atomic magnetometers, solving the load capacity problem existing in the heating circuit module of series control, and improving the stability and reliability of the heating circuit module. Compared with the comparative technology, the present application also reduces the phase difference between the heating currents of different channels by performing phase synchronization adjustment on the heating current of each channel, and reduces the influence of the current coupling effect on the heating circuit module by coupling adjustment, thereby improving the sensitivity of the multi-channel atomic magnetometer. In addition, the heating currents of each channel in the present application are independent of each other. When any channel is affected by external factors and causes the electrical characteristics to change, the other channels can still work normally, ensuring the reliability of the heating circuit module.

[0006] Optionally, the current signal of the reference channel is recorded as a reference current signal; and the phase synchronization adjustment of the initial current signal of any channel according to the current signal of the reference channel to obtain the target current signal includes: Outputting a phase difference signal of any one of the channels according to a phase difference between the initial current signal and the reference current signal; Searching in a signal phase difference comparison table according to the phase difference signal to determine phase difference data between the initial current signal and the reference current signal; Modify the initial phase control word of any channel according to the phase difference data to obtain a target phase control word; The target phase control word is input into any one of the channels, and the initial current signal is subjected to phase synchronization adjustment to obtain the target current signal.

[0007] Optionally, coupling-adjusting the initial amplification gain of any channel according to the initial amplitude ratio signal and the actual amplitude ratio signal between any channel and the reference channel to obtain the target amplification gain includes: Calculating the difference between the initial amplitude ratio signal and the actual amplitude ratio signal to obtain current coupling data; When the current coupling data indicates that the any channel is affected by the current coupling, determining a current temperature difference of the any channel according to the current temperature data of the any channel and the target temperature data; A gain feedback calculation is performed on the initial amplification gain of any one of the channels according to the current temperature difference to obtain the target amplification gain.

[0008] Optionally, the step of calculating the difference between the initial amplitude ratio signal and the actual amplitude ratio signal to obtain current coupling data includes: Performing logarithmic-linear conversion according to the initial amplification gain and heating circuit resistance of each of the any channel and the reference channel to obtain the initial amplitude ratio signal; Performing logarithmic-linear conversion according to actual amplification gains and heating circuit resistance values ​​of each of the any channel and the reference channel to obtain the actual amplitude ratio signal; The current coupling data is obtained according to the difference between the initial amplitude ratio signal and the actual amplitude ratio signal.

[0009] Optionally, dynamically adjusting the current amplification gain of any channel according to the initial temperature data and the target temperature data of any channel to obtain the initial amplification gain includes: Obtaining an initial temperature difference value of any channel according to the initial temperature data and the target temperature data of any channel; A gain feedback calculation is performed according to the initial temperature difference to obtain the initial amplification gain.

[0010] Optionally, the method further comprises: An external clock signal is received, and the frequency of the heating current of each channel is synchronized according to the external clock signal.

[0011] Optionally, the receiving an external clock signal and performing frequency synchronization on the heating current of each channel according to the external clock signal includes: Determining a corresponding frequency control word in a waveform lookup table according to the clock frequency of the external clock signal; The frequency control word is input into any channel to perform frequency synchronization on the heating current of any channel.

[0012] In a second aspect, an embodiment of the present application provides a multi-channel heating current modulation system, comprising: A main control circuit module, comprising a main control unit and a gain adjustment analog-to-digital conversion unit, wherein the main control unit comprises a phase control unit and a temperature control unit; An amplitude-phase modulation circuit module, comprising a multi-channel signal multiplexing unit, an amplitude-phase detection unit and a signal digital-to-analog conversion unit; Several heating circuit modules, including a high-frequency digital signal generating unit, a heating signal analog-to-digital conversion unit, a low-pass filter circuit unit, an adjustable power amplification unit, a heating coil unit and a temperature sensor; The signal digital-to-analog conversion unit is also connected to the amplitude-phase detection unit, and the amplitude-phase detection unit uses the multiplexer unit to obtain the initial current signal and the initial amplitude ratio signal of the heating circuit module; The signal digital-to-analog conversion unit is connected to the temperature sensors of the respective heating circuit modules, and is used to obtain initial temperature data of the heating circuit modules; The temperature control unit is connected to the signal digital-to-analog conversion unit and is used for dynamic adjustment according to the initial temperature data; the temperature control unit is also used for coupling adjustment according to the initial amplitude ratio signal and the actual amplitude ratio signal between the heating circuit modules; The phase control unit is connected to the signal digital-to-analog conversion unit and is used to perform phase synchronization adjustment according to the initial current signal.

[0013] Optionally, the main control unit also includes a phase-locked loop, which is connected between an external clock unit and a clock buffer. The clock buffer is connected to a high-frequency digital signal generating unit of the plurality of heating circuit modules and is used to synchronize the frequency of the heating current of each heating circuit module based on an external clock signal.

[0014] In a third aspect, an embodiment of the present application provides a multi-channel heating current modulation device, comprising: The main control circuit module includes an FPGA chip, a crystal oscillator circuit, a reset circuit, a JTAG serial port circuit, an EEPROM circuit, a clock buffer circuit, and a gain adjustment analog-to-digital conversion circuit; An amplitude-phase modulation circuit module, including a multi-channel signal selection circuit, an amplitude-phase detection circuit and a signal digital-to-analog conversion circuit; Several heating circuit modules, including a signal generating circuit, a heating signal analog-to-digital conversion circuit, a low-pass filtering circuit, an adjustable power amplifier circuit, and an atomic magnetometer probe; The FPGA chip is connected to the plurality of heating circuit modules via SPI serial communication; the gain adjustment analog-to-digital conversion circuit and the FPGA chip are used to dynamically adjust the current amplification gain of any channel heating circuit module according to the signal output by the FPGA chip; The atomic magnetometer probe comprises an atomic gas chamber, a heating coil and a temperature sensor.

[0015] In a fourth aspect, an embodiment of the present application provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the method described in any one of the above embodiments by executing the computer instructions.

[0016] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to enable a computer to execute any one of the methods in the above embodiments.

[0017] In a sixth aspect, an embodiment of the present application provides a computer program product, including computer instructions, wherein the computer instructions are used to enable a computer to execute any one of the methods described in the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A step diagram of a multi-channel heating current modulation method provided in an embodiment of the present application; Figure 2 A diagram showing the steps of obtaining a target current signal in an embodiment of the present application; Figure 3 A diagram showing the steps for obtaining a target amplification gain in an embodiment of the present application; Figure 4 A diagram showing the steps for obtaining current coupling data in an embodiment of the present application; Figure 5 A diagram showing the steps for obtaining the initial amplification gain in an embodiment of the present application; Figure 6 A diagram showing the steps of performing frequency synchronization in an embodiment of the present application; Figure 7 This is a schematic diagram of a heating current signal of a heating circuit module in an embodiment of the present application; Figure 8 A module diagram of a multi-channel heating current modulation system provided in an embodiment of the present application; Fig. 9 A structural diagram of a multi-channel heating current modulation device provided in an embodiment of the present application; Fig.10 A module diagram of a multi-channel heating current modulation device provided in an embodiment of the present application; Fig.11 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0021] An atomic magnetometer is an instrument for measuring weak magnetic fields. Its core principle is to use pump light to pump atoms in an atomic gas chamber to a specific energy level, and measure the absorption or fluorescence changes of the atoms to light, thereby inferring the magnetic field strength within a certain range. During operation, the atomic magnetometer needs to heat the atomic gas chamber so that the alkali metal atoms in the atomic gas chamber evaporate into a gas state and maintain a constant atomic density at a stable temperature to support the atomic magnetometer's precise detection of quantum effects.

[0022] For densely arranged multi-channel atomic magnetometer arrays, the relevant technology usually uses multiple heating circuit modules controlled in series to heat the atomic gas chambers separately through the same heating current, thereby ensuring that there is no amplitude and phase difference between the heating currents in each channel, reducing the impact on the sensitivity of the atomic magnetometer. It should be noted that the stability of the heating current in each channel is affected by the load capacity of the series controller. When the series controller cannot provide enough power to meet the requirements of all channels, it will cause the heating current in the channel to become unstable, thereby affecting the measurement accuracy of the atomic magnetometer. At the same time, the load capacity of the series controller also determines the number of channels corresponding to the heating circuit module. When the number of channels increases, higher requirements are placed on the load capacity of the series controller.

[0023] In addition, since the heating coils of each channel cannot be turned on at the same time, even if the same heating current is output to each channel, there may still be phase-frequency differences between the heating currents of different channels. Therefore, the technical solutions in the related art cannot completely eliminate the phase-frequency differences between different channels, which will greatly affect the measurement accuracy and sensitivity of the atomic magnetometer.

[0024] Based on the above problems, the present application provides a multi-channel heating current modulation method, system and device, wherein the heating currents of each channel are independent of each other; the method includes: dynamically adjusting the current amplification gain of any channel according to the initial temperature data and target temperature data of any channel to obtain the initial amplification gain; phase-synchronizing the initial current signal of any channel according to the current signal of the reference channel to obtain the target current signal; coupling-adjusting the initial amplification gain of any channel according to the initial amplitude ratio signal and the actual amplitude ratio signal between any channel and the reference channel to obtain the target amplification gain; adaptively modulating the heating current of any channel according to the target current signal and the target amplification gain to obtain the target heating current.

[0025] The multi-channel heating current modulation method proposed in the embodiment of the present application outputs an independent heating current to each channel and performs phase synchronization adjustment and coupling adjustment on the heating current of each channel, thereby eliminating the magnetic field projection error between atomic magnetometers, solving the load capacity problem existing in the series-controlled heating circuit module, and improving the stability and reliability of the heating circuit module.

[0026] Compared with the comparative technology, the present application also reduces the phase difference between the heating currents of different channels by adjusting the phase synchronization of the heating current of each channel, and reduces the influence of the current coupling effect on the heating circuit module through coupling adjustment, thereby improving the sensitivity of the multi-channel atomic magnetometer. In addition, the heating currents of each channel in the present application are independent of each other. When any channel is affected by external factors and causes the electrical characteristics to change, the other channels can still work normally, ensuring the reliability of the heating circuit module.

[0027] The multi-channel heating current modulation method provided in this specification can be applied to heat the atomic gas chamber of a multi-channel atomic magnetometer, thereby solving the load capacity and sensitivity problems caused by the multi-channel. It is understandable that the present application can also be applied to other equipment that requires multi-channel synchronous heating after adaptive modification, including but not limited to high-precision sensor arrays and optical fiber sensor arrays.

[0028] According to an embodiment of the present application, an embodiment of a multi-channel heating current modulation method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0029] In this embodiment, a multi-channel heating current modulation method is provided, which can be used to heat the atomic gas chamber of a multi-channel atomic magnetometer. Figure 1 As shown, the heating currents of the channels are independent of each other; the method includes: S100. According to the initial temperature data and the target temperature data of any channel, the current amplification gain of any channel is dynamically adjusted to obtain the initial amplification gain.

[0030] S200. Perform phase synchronization adjustment on the initial current signal of any channel according to the current signal of the reference channel to obtain a target current signal; wherein the reference channel is different from any channel.

[0031] S300. According to the initial amplitude ratio signal and the actual amplitude ratio signal between any channel and the reference channel, the initial amplification gain of any channel is coupled and adjusted to obtain the target amplification gain; wherein the initial amplitude ratio signal is obtained according to the initial amplification gains of any channel and the reference channel respectively.

[0032] S400. Adaptively modulate the heating current of any channel according to the target current signal and the target amplification gain to obtain the target heating current.

[0033] Among them, the reference channel can be a channel selected arbitrarily from all channels, so that the heating current of any channel is adjusted according to the current signal of the reference channel. The heating currents of each channel are independent of each other. When the reference channel cannot work normally due to external reasons, any channel can be selected from other channels that can work normally as the reference channel. It should be noted that in this application, by outputting independent heating current signals to each channel, the load capacity limitation caused by the series controller in the related art is solved, and the flexibility of the heating circuit module is improved. At the same time, the independent heating current signal shortens the transmission distance of the single current signal, solves the distortion problem of long-distance signal transmission, and improves the stability of the heating circuit module.

[0034] The initial temperature data may be the temperature data obtained by the temperature sensor in each channel before the current amplification gain is dynamically adjusted, that is, the temperature data of the atomic gas chamber corresponding to each channel. The target temperature data indicates the target temperature that each channel needs to reach, that is, the target temperature that the atomic gas chamber corresponding to each channel needs to reach.

[0035] The initial current signal may be the heating current signal in each channel before phase synchronization adjustment, and the initial current signal corresponds to an initial current frequency, an initial current amplitude, and an initial current phase. Similarly, the target current signal may be the heating current signal in each channel after phase synchronization adjustment, and the target current signal corresponds to a target current frequency, a target current amplitude, and a target current phase, and the target current phases of target current signals of different channels are the same.

[0036] The initial amplitude ratio signal can be a ratio signal between the set current signal amplitude of any channel and the set current signal amplitude of the reference channel. At this time, the set current signals in any channel and the reference channel are set according to their respective initial amplification gains, that is, the initial amplitude ratio signal can be a set amplitude ratio signal obtained according to the initial amplification gains of each channel.

[0037] The actual amplitude ratio signal can be a ratio signal obtained according to the actual current signal amplitude of any channel and the actual current signal amplitude of the reference channel after the heating current is output. At this time, the actual current signal in any channel is affected by the current signal of other channels and is different from the original set current signal of any channel. Similarly, the actual current signal in the reference channel is also affected by the current signal of other channels and is different from the original set current signal of the reference channel.

[0038] It should be noted that the multi-channel heating current modulation method provided in the present application can be repeated during the measurement process using a multi-channel atomic magnetometer, thereby performing real-time adaptive modulation of the multi-channel heating current, so that the multi-channel atomic magnetometer can maintain high measurement accuracy and high sensitivity for a long time.

[0039] Specifically, for any channel, the temperature of the atomic gas chamber corresponding to the channel is first measured by the temperature sensor in the channel as the initial temperature data. The atomic gas chamber corresponds to the target temperature data, and the current amplification gain of the channel is adjusted according to the initial temperature data and the target temperature data to obtain the initial amplification gain, thereby adjusting the amplitude of the heating current in the channel so that after heating, the atomic gas chamber can reach the temperature corresponding to the target temperature data.

[0040] It is understandable that when the initial temperature data is lower than the target temperature data, the current amplification gain of the channel is increased to increase the temperature of the atomic gas chamber; when the initial temperature data is higher than the target temperature data, the current amplification gain of the channel is reduced to reduce the temperature of the atomic gas chamber. It is understandable that the reference channel is also dynamically adjusted through the current amplification gain so that the corresponding atomic gas chamber reaches the target temperature.

[0041] Furthermore, a heating current is output in the channel according to the initial amplification gain, thereby heating the atomic gas chamber. After the temperature of the atomic gas chamber reaches the target temperature and tends to be stable, the initial current signal of the channel and its corresponding initial current phase are obtained. The current signal of the reference channel and its corresponding reference current phase can be determined in advance, or can be obtained simultaneously with the initial current signal. According to the difference between the initial current phase and the reference current phase, the initial current signal of the channel is phase-synchronized and adjusted to obtain the target current signal, so that the current phase of the channel is the same as the current phase of the reference channel, thereby eliminating the magnetic field projection error between the atomic magnetometers corresponding to the channel and the reference channel.

[0042] It can be understood that after the phase synchronization adjustment is performed on the channel, the same phase synchronization adjustment can also be performed on other channels except the reference channel and the channel, so that the current phases of all channels are unified to the current phase of the reference channel, thereby eliminating the magnetic field projection error between the atomic magnetometers in the multi-channel atomic magnetometer, and effectively improving the sensitivity of the multi-channel atomic magnetometer.

[0043] Further, for a multi-channel atomic magnetometer, when the heating circuit modules of different channels are close, the heating currents of the heating circuit modules will have a current coupling effect, resulting in the actual heating current in the channel being different from the initial heating current obtained according to the initial amplification gain, causing an error in the temperature of the atomic gas chamber. It is understandable that the actual amplitude ratio signal obtained by the actual heating current of each channel and the reference channel is different from the initial amplitude ratio signal obtained by the initial heating current of each channel and the reference channel, and the difference between the two can quantify the degree of current coupling between the channel and the reference channel. According to the initial amplitude ratio signal and the actual amplitude ratio signal, the initial amplification gain of any channel is coupled and adjusted to obtain the target amplification gain, thereby eliminating the current coupling effect between any channel and the reference channel, so that the atomic gas chamber can maintain the target temperature, improve the temperature stability of the atomic gas chamber, and thus improve the measurement accuracy and sensitivity of the multi-channel atomic magnetometer.

[0044] The multi-channel heating current modulation method provided in this embodiment outputs an independent heating current to each channel, and performs phase synchronization adjustment and coupling adjustment on the heating current of each channel, thereby eliminating the magnetic field projection error between atomic magnetometers, solving the load capacity problem existing in the heating circuit module of series control, and improving the stability and reliability of the heating circuit module.

[0045] Compared with the comparative technology, the present application also reduces the phase difference between the heating currents of different channels by adjusting the phase synchronization of the heating current of each channel, and reduces the influence of the current coupling effect on the heating circuit module through coupling adjustment, thereby improving the sensitivity of the multi-channel atomic magnetometer. In addition, the heating currents of each channel in the present application are independent of each other. When any channel is affected by external factors and causes the electrical characteristics to change, the other channels can still work normally, ensuring the reliability of the heating circuit module.

[0046] Reference Figure 2 As shown, as an embodiment of the present application, the current signal of the reference channel is recorded as the reference current signal; the initial current signal of any channel is phase-synchronized and adjusted according to the current signal of the reference channel to obtain the target current signal, including: S210. Output a phase difference signal of any channel according to the phase difference between the initial current signal and the reference current signal.

[0047] S220. Look up the signal phase difference comparison table according to the phase difference signal to determine the phase difference data between the initial current signal and the reference current signal.

[0048] S230. Modify the initial phase control word of any channel according to the phase difference data to obtain a target phase control word.

[0049] S240. Input the target phase control word into any channel, perform phase synchronization adjustment on the initial current signal, and obtain the target current signal.

[0050] Specifically, according to the phase difference between the initial current signal and the reference current signal, the phase difference signal of any channel can be obtained. It can be understood that the initial current signal and the reference current signal are analog signals, and the obtained phase difference signal is also an analog signal, which contains the phase difference information between the initial current signal and the reference current signal. After the phase difference signal is converted into a digital signal, it is queried according to a predetermined signal phase difference comparison table to obtain the corresponding phase difference data. It can be understood that the phase difference data represents the phase difference value between the initial current signal and the reference current signal.

[0051] Furthermore, the initial phase control word of any channel is modified according to the phase difference data to obtain the target phase control word, and the target phase control word is input into the high-frequency digital signal generating unit of any channel, thereby changing the current phase of the heating current signal so that it is the same as the current phase of the current signal in the reference channel.

[0052] It should be noted that, in actual situations, the current phases between different channels cannot be exactly the same. Therefore, the current signal of any channel can be repeatedly adjusted in phase synchronization so that the current phase difference between the channel and the reference channel is continuously reduced until the current phase difference is stabilized to the minimum value, and the adjustment is stopped to obtain the target current signal. The method for judging whether the current phase difference is stabilized to the minimum value can be to judge based on the change of the current phase difference. If the current phase difference does not change during multiple repeated adjustments, or the change amplitude is less than the preset threshold, it is determined that the current phase difference has stabilized to the minimum value and the adjustment is stopped.

[0053] Reference Figure 3 As shown, as an embodiment of the present application, according to the initial amplitude ratio signal and the actual amplitude ratio signal between any channel and the reference channel, the initial amplification gain of any channel is coupled and adjusted to obtain the target amplification gain, including: S310. Calculate the difference between the initial amplitude ratio signal and the actual amplitude ratio signal to obtain current coupling data.

[0054] S320. When the current coupling data indicates that any channel is affected by the current coupling, determine the current temperature difference of any channel according to the current temperature data and the target temperature data of any channel.

[0055] S330. Perform a gain feedback calculation on the initial amplification gain of any channel according to the current temperature difference to obtain a target amplification gain.

[0056] Specifically, when current coupling occurs, the current signal of the reference channel is in the following form: in, represents the current signal of the reference channel, Represents the coupled current signal of the reference channel; is the coupling current generated by any channel to the reference channel. Similarly, in the case of current coupling, the current signal of any channel is as follows: in, Represents the target current signal of any channel, Represents the coupled current signal of any channel; It is the coupling current generated by the reference channel to any channel.

[0057] According to the current signal of the reference channel and the target current signal of any channel The initial amplitude ratio signal can be obtained , according to the coupled current signal of the reference channel And the coupled current signal of any channel The actual amplitude ratio signal can be obtained It can be understood that the initial amplitude ratio signal and the actual amplitude ratio signal The difference between them indicates the degree of coupling current generated between any channel and the reference channel. When the difference between the two exceeds the set threshold, it is determined that any channel or the reference channel is affected by current coupling.

[0058] Furthermore, when coupling adjustment is performed on any channel, the temperature of the corresponding atomic gas chamber is measured by the temperature sensor in any channel as current temperature data, and the current temperature difference is determined based on the difference between the current temperature data and the target temperature data.

[0059] The gain feedback calculation process is explained by way of example. The gain feedback calculation method can be to use the PID algorithm to calculate the required intermediate amplification gain according to the current temperature difference, and adjust the initial amplification gain through pulse width modulation so that the initial amplification gain is adjusted to the intermediate amplification gain. After the adjustment, the temperature of the atomic gas chamber is collected again, and the current temperature data and the current temperature difference are updated. The intermediate amplification gain is recalculated according to the updated current temperature difference, and the above process of adjusting the amplification gain is repeated until the current temperature data is close to the target temperature data, and the intermediate amplification gain at this time is used as the target amplification gain.

[0060] Similarly, the reference channel can also be coupled and adjusted in a similar manner to any channel to obtain the target amplification gain, thereby eliminating the influence of current coupling. It should be noted that the current coupling between channels will cause the heating circuit in the heating circuit module to deviate, thereby affecting the temperature of the atomic gas chamber, causing the temperature of the atomic gas chamber to deviate from the target temperature. When using a multi-channel atomic magnetometer for measurement, the temperature of the atomic gas chamber greatly affects the measurement accuracy and sensitivity of the multi-channel atomic magnetometer. By coupling and adjusting the amplification gain, the influence of current coupling on the channel is effectively eliminated, the measurement accuracy and sensitivity of the multi-channel atomic magnetometer are improved, and the measurement accuracy and sensitivity of the multi-channel atomic magnetometer can be maintained at a high level for a long time through adaptive adjustment.

[0061] Reference Figure 4 As shown, as an embodiment of the present application, the initial amplitude ratio signal and the actual amplitude ratio signal are subtracted to obtain current coupling data, including: S311. Perform logarithmic-linear conversion based on the initial amplification gain and heating circuit resistance of any channel and the reference channel to obtain an initial amplitude ratio signal.

[0062] S313. Perform logarithmic-linear conversion based on the actual amplification gain and heating circuit resistance of any channel and the reference channel to obtain an actual amplitude ratio signal.

[0063] S315. Obtain current coupling data according to the difference between the initial amplitude ratio signal and the actual amplitude ratio signal.

[0064] Specifically, the current signal of the reference channel is in the following form: in, is the current amplification gain of the reference channel; is the current frequency of the reference channel; is the current phase of the reference channel. Similarly, the target current signal of any channel is in the following form: in, is the current amplification gain of any channel; is the current frequency of any channel; is the current phase of any channel. It can be understood that after phase synchronization adjustment, .

[0065] Furthermore, logarithmic linear conversion is performed based on the initial amplification gain and heating circuit resistance of any channel, as well as the initial amplification gain and heating circuit resistance of the reference channel, to obtain an initial amplitude ratio signal, which is in the following form: in, represents the initial amplitude ratio signal; is the voltage constant; is the resistance of the heating circuit corresponding to the reference channel, is the resistance of the heating circuit corresponding to any channel. Similarly, according to the actual amplification gain and the resistance of the heating circuit of any channel, and the actual amplification gain and the resistance of the heating circuit of the reference channel, logarithmic linear conversion is performed to obtain the actual amplitude ratio signal, which is in the following form: in, Indicates the actual amplitude ratio signal; is the current amplification gain of the reference channel when current coupling exists; is the current amplification gain of any channel when current coupling exists.

[0066] Furthermore, according to the difference between the initial amplitude ratio signal and the actual amplitude ratio signal, the current coupling data is obtained, which is in the following form: According to the comparison result between the current coupling data and the preset threshold value, it can be determined whether any channel or the reference channel is affected by the current coupling.

[0067] Reference Figure 5 As shown, as an embodiment of the present application, according to the initial temperature data and the target temperature data of any channel, the current amplification gain of any channel is dynamically adjusted to obtain the initial amplification gain, including: S110. Obtain an initial temperature difference of any channel according to the initial temperature data and target temperature data of any channel.

[0068] S120. Perform gain feedback calculation according to the initial temperature difference to obtain an initial amplification gain.

[0069] Specifically, the temperature of the corresponding atomic gas chamber is measured by a temperature sensor in any channel as initial temperature data, and the initial temperature difference is determined according to the difference between the initial temperature data and the target temperature data.

[0070] The process of dynamically adjusting the current amplification gain is exemplarily described. The method of gain feedback calculation can be to use the PID algorithm to calculate the required amplification gain to be adjusted according to the initial temperature difference, and output the amplification gain to be adjusted to the channel through pulse width modulation. After the output, the temperature of the atomic gas chamber is collected again, and the initial temperature data and the initial temperature difference are updated. The amplification gain to be adjusted is recalculated according to the updated initial temperature difference, and the amplification gain to be adjusted is dynamically adjusted according to the recalculated result. Repeat the above process of adjusting the amplification gain until the initial temperature data is close to the target temperature data, and the amplification gain to be adjusted at this time is used as the initial amplification gain.

[0071] As an embodiment of the present application, the method further includes: S500. Receive an external clock signal, and perform frequency synchronization on the heating current of each channel according to the external clock signal.

[0072] Specifically, the external clock signal provides a unified time reference for the heating signal in the multi-channel atomic magnetometer. A phase-locked loop is constructed according to the external clock signal. After the external clock signal is multiplied, the external clock signal is distributed to the heating circuit modules of each channel, and the external clock signal distributed to each channel has the same frequency and phase. The heating circuit modules of each channel can generate the same frequency control word through the distributed external clock signal, so that the heating current signal output by each channel has the same frequency, eliminating the frequency deviation between the heating current signals of different channels, and realizing the synchronous control of multiple channels.

[0073] Reference Figure 6 As shown, as an embodiment of the present application, an external clock signal is received, and the frequency of the heating current of each channel is synchronized according to the external clock signal, including: S510. Determine a corresponding frequency control word in a waveform lookup table according to the clock frequency of the external clock signal.

[0074] S520. Input the frequency control word into any channel to perform frequency synchronization on the heating current of any channel.

[0075] Specifically, the waveform lookup table stores the correspondence between the waveform of the external clock signal and the frequency control word. According to the external clock signal assigned to each channel, the corresponding clock frequency is determined, and the corresponding frequency control word is determined by searching in the waveform lookup table. It can be understood that since the external clock signal assigned to each channel has the same frequency and phase, the frequency control word determined by each channel is also the same. The reference channel determines the frequency control word in the same way as any channel.

[0076] Furthermore, a frequency control word is input into any channel to adjust the frequency of the heating current of any channel, so that the heating current signals of all channels have the same clock frequency, thereby realizing multi-channel frequency synchronization, eliminating the frequency deviation between the heating current signals of different channels, and improving the measurement accuracy and sensitivity of the multi-channel atomic magnetometer.

[0077] Based on the multi-channel heating current modulation method provided in this application, the heating current of the multi-channel atomic magnetometer is modulated, and the obtained heating current signal can be referred to Figure 7 As shown, Figure 7 It can be seen that after modulation according to the method provided in this application, the heating current signals of different channels have high similarity, and can remain stable within a long range, and can be modulated when errors occur, thus timely reducing the impact of external interference.

[0078] Reference Figure 8 As shown, an embodiment of the present application provides a multi-channel heating current modulation system, the system comprising: The main control circuit module comprises a main control unit and a gain adjustment analog-to-digital conversion unit. The main control unit comprises a phase control unit and a temperature control unit.

[0079] The amplitude-phase modulation circuit module comprises a multi-channel signal multiplexing unit, an amplitude-phase detection unit and a signal digital-to-analog conversion unit.

[0080] A plurality of heating circuit modules include a high-frequency digital signal generating unit, a heating signal analog-to-digital conversion unit, a low-pass filtering circuit unit, an adjustable power amplifying unit, a heating coil unit and a temperature sensor.

[0081] The signal digital-to-analog conversion unit is also connected to the amplitude-phase detection unit, and the amplitude-phase detection unit uses the multi-channel signal multiplexing unit to obtain the initial current signal and the initial amplitude ratio signal of the heating circuit module.

[0082] The signal digital-to-analog conversion unit is connected to the temperature sensors of the respective heating circuit modules to obtain the initial temperature data of the heating circuit modules.

[0083] The temperature control unit is connected to the signal digital-to-analog conversion unit and is used for dynamic adjustment according to the initial temperature data; the temperature control unit is also used for coupling adjustment according to the initial amplitude ratio signal and the actual amplitude ratio signal between the heating circuit modules.

[0084] The phase control unit is connected to the signal digital-to-analog conversion unit and is used for performing phase synchronization adjustment according to the initial current signal.

[0085] As an embodiment of the present application, the main control unit also includes a phase-locked loop, which is connected between an external clock unit and a clock buffer. The clock buffer is connected to a high-frequency digital signal generating unit of a number of heating circuit modules and is used to synchronize the frequency of the heating current of each heating circuit module based on the external clock signal.

[0086] The main control circuit module further includes an external clock unit and a clock buffer, and the main control unit further includes an amplitude monitoring unit and a phase-locked loop. The external clock unit is connected to the phase-locked loop, and the phase-locked loop is connected to the clock buffer. The external clock unit is used to receive an external clock signal, and the clock buffer is used to distribute the clock signal output by the phase-locked loop to the high-frequency digital signal generating unit of the heating circuit module. The amplitude monitoring unit is used to obtain an initial amplitude ratio signal and an actual amplitude ratio signal. The phase control unit and the temperature control unit are respectively connected to the high-frequency digital signal generating unit, and the gain adjustment analog-to-digital conversion unit is connected to the adjustable power amplification unit.

[0087] The heating circuit module also includes an atomic gas chamber, which is connected to a temperature sensor. A high-frequency digital signal generating unit, a heating signal analog-to-digital conversion unit, a low-pass filter circuit unit, an adjustable power amplifier unit and a heating coil unit are connected in sequence. The heating coil unit is used to heat the atomic gas chamber.

[0088] The multiplex signal multiplexing unit is connected to the adjustable power amplifier units of the multiple heating circuit modules, and the multiplex signal multiplexing unit is also connected to the main control unit and the amplitude and phase detection unit respectively. The amplitude and phase detection unit is connected to the adjustable power amplifier unit of the heating circuit module corresponding to the reference channel, and the amplitude and phase detection unit is also connected to the temperature sensor of the heating circuit module through the signal digital-to-analog conversion unit. The signal digital-to-analog conversion unit is also used to output the temperature control unit, the amplitude monitoring unit and the phase control unit respectively.

[0089] It should be noted that the multi-channel heating current modulation system provided in the present application has a reasonable modular design, and the main control circuit module, the amplitude and phase modulation circuit module and the heating circuit module can work independently. When any module fails, the connection between any module and other modules is cut off to ensure that other modules can work normally. In the present application, the heating circuits of multiple channels are also integrated to improve the integration of the system, and the independence between the channels is guaranteed by outputting independent heating currents to each channel.

[0090] Reference Fig. 9 As shown, an embodiment of the present application provides a multi-channel heating current modulation device, the device comprising: The main control circuit module includes an FPGA chip, a crystal oscillator circuit, a reset circuit, a JTAG serial port circuit, an EEPROM circuit, a clock buffer circuit and a gain adjustment analog-to-digital conversion circuit.

[0091] The amplitude-phase modulation circuit module comprises a multi-channel signal selection circuit, an amplitude-phase detection circuit and a signal digital-to-analog conversion circuit.

[0092] A plurality of heating circuit modules include a signal generating circuit, a heating signal analog-to-digital conversion circuit, a low-pass filtering circuit, an adjustable power amplifier circuit and an atomic magnetometer probe.

[0093] The FPGA chip is connected to several heating circuit modules via SPI serial communication; the gain adjustment analog-to-digital conversion circuit and the FPGA chip are used to dynamically adjust the current amplification gain of any channel heating circuit module according to the signal output by the FPGA chip.

[0094] The atomic magnetometer probe consists of an atomic gas chamber, a heating coil and a temperature sensor.

[0095] Specifically, the multi-channel heating current modulation device provided by the present application has modules and units printed on a circuit board through a PCBA process, and a PCIE interface is used to transmit signals between hardware media of different modules.

[0096] The main control circuit module also includes a voltage-stabilized power supply circuit, which is used to convert the 24V DC power supply into a regulated output of 12V, 5V, 3.3V or 1.2V to power the modules and units. An active crystal oscillator is used in the crystal oscillator circuit. The SPI serial port is used to establish communication between the FPGA chip and the heating circuit module, and the EEPROM circuit is used to store the signal phase difference comparison table. The gain adjustment analog-to-digital conversion circuit is used to receive the pulse width modulation signal output by the FPGA chip, and output a gain adjustment signal to the heating circuit module to adjust the amplification gain of the heating circuit module.

[0097] In the amplitude-phase modulation circuit module, the multi-channel signal selection circuit includes an analog switch and a multiplexer, and the amplitude-phase detection circuit includes a radio frequency amplitude-phase detector and a driving circuit thereof.

[0098] In the heating circuit module, the signal generation circuit includes an STM32 chip, a DDS chip and a SWD serial port. The STM32 chip and the DDS chip establish communication through the SPI serial port. The STM32 chip is used to write a waveform lookup table, a frequency control word and a phase control word. The low-pass filter circuit includes a second-order active low-pass filter based on an operational amplifier. The adjustable power amplifier circuit includes a programmable gain amplifier and its driving circuit. The atomic magnetometer probe includes an atomic gas chamber, a heating coil and a temperature sensor.

[0099] Accordingly, please refer to Fig.10 The embodiment of the present application provides a multi-channel heating current modulation device, wherein the heating currents of the various channels are independent of each other; the device comprises: The initial gain adjustment module 1010 is used to dynamically adjust the current amplification gain of any channel according to the initial temperature data and target temperature data of any channel to obtain the initial amplification gain.

[0100] The phase synchronization adjustment module 1020 is used to perform phase synchronization adjustment on the initial current signal of any channel according to the current signal of the reference channel to obtain a target current signal; wherein the reference channel is different from any channel.

[0101] The target gain adjustment module 1030 is used to couple and adjust the initial amplification gain of any channel according to the initial amplitude ratio signal and the actual amplitude ratio signal between any channel and the reference channel to obtain the target amplification gain; wherein the initial amplitude ratio signal is obtained according to the initial amplification gain of any channel and the reference channel respectively.

[0102] The current adaptive modulation module 1040 is used to adaptively modulate the heating current of any channel according to the target current signal and the target amplification gain to obtain the target heating current.

[0103] In some optional implementations, the current signal of the reference channel is recorded as a reference current signal; the phase synchronization adjustment module 1020 includes: The phase difference signal output unit is used to output the phase difference signal of any channel according to the phase difference between the initial current signal and the reference current signal.

[0104] The phase difference data query unit is used to query the signal phase difference comparison table according to the phase difference signal to determine the phase difference data between the initial current signal and the reference current signal.

[0105] The phase control word modification unit is used to modify the initial phase control word of any channel according to the phase difference data to obtain the target phase control word.

[0106] The phase synchronization adjustment unit is used to input the target phase control word into any channel, perform phase synchronization adjustment on the initial current signal, and obtain the target current signal.

[0107] In some optional implementations, the target gain adjustment module 1030 includes: The current coupling quantization unit is used to obtain the difference between the initial amplitude ratio signal and the actual amplitude ratio signal to obtain the current coupling data.

[0108] The current temperature difference calculation unit is used to determine the current temperature difference of any channel according to the current temperature data and the target temperature data of any channel when the current coupling data indicates that any channel is affected by the current coupling.

[0109] The target gain feedback calculation unit is used to perform gain feedback calculation on the initial amplification gain of any channel according to the current temperature difference to obtain the target amplification gain.

[0110] In some optional implementations, the current-coupled quantization unit includes: The initial linear conversion subunit is used to perform logarithmic linear conversion according to the initial amplification gain and heating circuit resistance of each channel and the reference channel to obtain an initial amplitude ratio signal.

[0111] The actual linear conversion subunit is used to perform logarithmic linear conversion according to the actual amplification gain and heating circuit resistance of any channel and the reference channel respectively, so as to obtain the actual amplitude ratio signal.

[0112] The amplitude ratio signal difference calculating subunit is used to obtain current coupling data according to the difference between the initial amplitude ratio signal and the actual amplitude ratio signal.

[0113] In some optional implementations, the initial gain adjustment module 1010 includes: The initial temperature difference calculation unit is used to obtain the initial temperature difference of any channel according to the initial temperature data and target temperature data of any channel.

[0114] The initial gain feedback calculation unit is used to perform gain feedback calculation according to the initial temperature difference to obtain an initial amplification gain.

[0115] In some optional embodiments, the device further comprises: The clock signal synchronization module is used to receive an external clock signal and synchronize the frequency of the heating current of each channel according to the external clock signal.

[0116] In some optional implementations, the clock signal synchronization module includes: The frequency control word search unit is used to determine the corresponding frequency control word in the waveform search table according to the clock frequency of the external clock signal.

[0117] The current frequency synchronization unit is used to input the frequency control word into any channel and perform frequency synchronization on the heating current of any channel.

[0118] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0119] The multi-channel heating current modulation device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0120] See also Fig.11 , Fig.11 It is a structural diagram of a computer device provided by an embodiment of the present application. As shown in the figure, the computer device includes: one or more processors 10, a memory 20, and an interface for connecting various components, including a high-speed interface and a low-speed interface. Each component uses different buses to communicate with each other, and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Fig.11 A processor 10 is taken as an example.

[0121] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0122] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0123] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0124] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0125] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0126] The embodiment of the present application also provides a computer-readable storage medium. The above method according to the embodiment of the present application can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0127] The embodiment of the present application provides a computer program product, which includes computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method of any embodiment of the present application.

[0128] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

[0129] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0130] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0131] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0132] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0133] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0135] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0136] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0137] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0138] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A multi-channel heating current modulation method, characterized in that: The heating currents of the channels are independent of each other; the method comprises: According to the initial temperature data and the target temperature data of any channel, dynamically adjusting the current amplification gain of any channel to obtain the initial amplification gain; Performing phase synchronization adjustment on the initial current signal of any of the channels according to the current signal of the reference channel to obtain a target current signal; wherein the reference channel is different from any of the channels; According to the initial amplitude ratio signal and the actual amplitude ratio signal between the any channel and the reference channel, coupling adjustment is performed on the initial amplification gain of the any channel to obtain a target amplification gain; wherein the initial amplitude ratio signal is obtained according to the initial amplification gains of the any channel and the reference channel respectively; The heating current of any one of the channels is adaptively modulated according to the target current signal and the target amplification gain to obtain a target heating current.

2. The method according to claim 1, characterized in that The current signal of the reference channel is recorded as a reference current signal; The step of performing phase synchronization adjustment on the initial current signal of any channel according to the current signal of the reference channel to obtain the target current signal includes: Outputting a phase difference signal of any one of the channels according to a phase difference between the initial current signal and the reference current signal; Searching in a signal phase difference comparison table according to the phase difference signal to determine phase difference data between the initial current signal and the reference current signal; Modify the initial phase control word of any channel according to the phase difference data to obtain a target phase control word; The target phase control word is input into any one of the channels, and the initial current signal is subjected to phase synchronization adjustment to obtain the target current signal.

3. The method according to claim 1, characterized in that The coupling adjustment of the initial amplification gain of any channel according to the initial amplitude ratio signal and the actual amplitude ratio signal between any channel and the reference channel to obtain the target amplification gain includes: Calculating the difference between the initial amplitude ratio signal and the actual amplitude ratio signal to obtain current coupling data; When the current coupling data indicates that the any channel is affected by the current coupling, determining a current temperature difference of the any channel according to the current temperature data of the any channel and the target temperature data; A gain feedback calculation is performed on the initial amplification gain of any one of the channels according to the current temperature difference to obtain the target amplification gain.

4. The method according to claim 3, characterized in that The step of calculating the difference between the initial amplitude ratio signal and the actual amplitude ratio signal to obtain current coupling data includes: Performing logarithmic-linear conversion according to the initial amplification gain and heating circuit resistance of each of the any channel and the reference channel to obtain the initial amplitude ratio signal; Performing logarithmic-linear conversion according to actual amplification gains and heating circuit resistance values ​​of each of the any channel and the reference channel to obtain the actual amplitude ratio signal; The current coupling data is obtained according to the difference between the initial amplitude ratio signal and the actual amplitude ratio signal.

5. The method according to claim 1, characterized in that The step of dynamically adjusting the current amplification gain of any channel according to the initial temperature data and the target temperature data of any channel to obtain the initial amplification gain includes: Obtaining an initial temperature difference value of any channel according to the initial temperature data and the target temperature data of any channel; A gain feedback calculation is performed according to the initial temperature difference to obtain the initial amplification gain.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: An external clock signal is received, and the frequency of the heating current of each channel is synchronized according to the external clock signal.

7. The method according to claim 6, characterized in that The receiving of the external clock signal and synchronizing the frequency of the heating current of each channel according to the external clock signal includes: Determining a corresponding frequency control word in a waveform lookup table according to the clock frequency of the external clock signal; The frequency control word is input into any channel to perform frequency synchronization on the heating current of any channel.

8. A multi-channel heating current modulation system, characterized in that: include: A main control circuit module, comprising a main control unit and a gain adjustment analog-to-digital conversion unit, wherein the main control unit comprises a phase control unit and a temperature control unit; An amplitude-phase modulation circuit module, comprising a multi-channel signal multiplexing unit, an amplitude-phase detection unit and a signal digital-to-analog conversion unit; Several heating circuit modules, including a high-frequency digital signal generating unit, a heating signal analog-to-digital conversion unit, a low-pass filter circuit unit, an adjustable power amplification unit, a heating coil unit and a temperature sensor; The signal digital-to-analog conversion unit is also connected to the amplitude-phase detection unit, and the amplitude-phase detection unit uses the multiplexer unit to obtain the initial current signal and the initial amplitude ratio signal of the heating circuit module; The signal digital-to-analog conversion unit is connected to the temperature sensors of the respective heating circuit modules, and is used to obtain initial temperature data of the heating circuit modules; The temperature control unit is connected to the signal digital-to-analog conversion unit and is used for dynamic adjustment according to the initial temperature data; the temperature control unit is also used for coupling adjustment according to the initial amplitude ratio signal and the actual amplitude ratio signal between the heating circuit modules; The phase control unit is connected to the signal digital-to-analog conversion unit and is used to perform phase synchronization adjustment according to the initial current signal.

9. The system according to claim 8, characterized in that The main control unit also includes a phase-locked loop, which is connected between an external clock unit and a clock buffer. The clock buffer is connected to the high-frequency digital signal generating units of the plurality of heating circuit modules and is used to synchronize the frequency of the heating current of each heating circuit module based on an external clock signal.

10. A multi-channel heating current modulation device, characterized in that: include: The main control circuit module includes an FPGA chip, a crystal oscillator circuit, a reset circuit, a JTAG serial port circuit, an EEPROM circuit, a clock buffer circuit, and a gain adjustment analog-to-digital conversion circuit; Amplitude-phase modulation circuit module, including a multi-channel signal selection circuit, an amplitude-phase detection circuit and a signal digital-to-analog conversion circuit; Several heating circuit modules, including a signal generating circuit, a heating signal analog-to-digital conversion circuit, a low-pass filtering circuit, an adjustable power amplifier circuit, and an atomic magnetometer probe; The FPGA chip is connected to the plurality of heating circuit modules via SPI serial communication; the gain adjustment analog-to-digital conversion circuit and the FPGA chip are used to dynamically adjust the current amplification gain of any channel heating circuit module according to the signal output by the FPGA chip; The atomic magnetometer probe comprises an atomic gas chamber, a heating coil and a temperature sensor.

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