Atomic clock temperature control system and method

Abstract

The application provides an atomic clock temperature control system and method, which comprises a mounting seat, a clamp, an outer magnetic shielding cylinder, an inner magnetic shielding cylinder, an atomic clock physical unit, a first heat insulation layer, a second heat insulation layer, an electromagnetic heating sheet, a temperature sensor and a temperature control unit. The first heat insulation layer is wrapped outside the outer magnetic shielding cylinder, and the second heat insulation layer is arranged between the clamp and the mounting seat. The electromagnetic heating sheet is wrapped outside the inner magnetic shielding cylinder, and the temperature control unit is electrically connected with the temperature sensor and the electromagnetic heating sheet. The application utilizes the temperature control unit to perform PID control on the driving signal of the electromagnetic heating sheet, and has the advantages of simple overall structure, fast reaction speed, high control precision, accurate temperature control on the atomic clock physical unit, improved reliability of the atomic clock physical unit, weakened temperature interference of the external temperature change on the atomic clock physical system due to the arrangement of the first heat insulation layer and the second heat insulation layer, and improved anti-interference ability of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of atomic clock, and particularly to an atomic clock temperature control system and method. BACKGROUND

[0002] The atomic clock is a kind of precision time measurement instrument using electromagnetic waves emitted by atoms when absorbing or releasing energy for timing, which is widely used in positioning, navigation, communication, military and other fields.

[0003] An important factor affecting the frequency stability index of the atomic clock is the temperature of the atomic clock, and the temperature control of the physical system of the atomic clock is the key to the temperature control of the atomic clock. When the atomic clock is running, its physical system must be controlled within a certain temperature range, and only in a suitable temperature environment can its performance reliability be ensured. At present, in the physical system of the atomic clock, the change of external temperature will cause disturbance to the temperature of the physical system, and the temperature control system has the characteristics of delay, lag or instability, which often brings adverse effects to the temperature control. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art, and to provide an atomic clock temperature control system and method, which realizes accurate temperature control of the physical system of the atomic clock.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] An atomic clock temperature control system, comprising a mounting seat, a clamp, an outer magnetic shielding cylinder, an inner magnetic shielding cylinder, an atomic clock physical unit, a first thermal insulation layer, a second thermal insulation layer, an electromagnetic heating sheet, a temperature sensor and a temperature control unit.

[0007] The outer magnetic shielding cylinder is supported and fixed on the mounting seat through the clamp, the first thermal insulation layer is wrapped outside the outer magnetic shielding cylinder, and the second thermal insulation layer is arranged between the clamp and the mounting seat; the inner magnetic shielding cylinder is arranged inside the outer magnetic shielding cylinder, the electromagnetic heating sheet is wrapped outside the inner magnetic shielding cylinder, and the atomic clock physical unit is arranged inside the inner magnetic shielding cylinder; the temperature control unit is arranged outside the clamp, the temperature sensor is arranged in the atomic clock physical unit, and the electromagnetic heating sheet and the temperature sensor are electrically connected with the temperature control unit respectively.

[0008] The temperature sensor is used to collect the temperature signal of the atomic clock physical unit and feed back the temperature signal to the temperature control unit, the temperature control unit is used to calculate and process signals according to the temperature signal, the preset temperature and the preset PID temperature control algorithm, so as to obtain a driving signal, and output the driving signal to the electromagnetic heating sheet, so as to control the electromagnetic heating sheet to work under the driving signal.

[0009] Preferably, the driving signal is a direct current driving signal.

[0010] Preferably, the temperature control unit comprises an analog-to-digital conversion module, a digital PID control module, a digital-to-analog conversion module and a direct current driving module connected in sequence, the input end of the analog-to-digital conversion module is electrically connected with the temperature sensor, and the output end of the direct current driving module is electrically connected with the electromagnetic heating sheet.

[0011] The temperature sensor is configured to collect a temperature analog signal of the atomic clock physical unit and transmit the temperature analog signal to the analog-to-digital conversion module; the analog-to-digital conversion module is configured to convert the temperature analog signal into a temperature digital signal and transmit the temperature digital signal to the digital PID control module; the digital PID control module is configured to calculate a digital driving signal according to the temperature digital signal, the preset temperature and a preset digital PID temperature control algorithm and transmit the digital driving signal to the digital-to-analog conversion module; the digital-to-analog conversion module is configured to convert the digital driving signal into an analog driving signal and transmit the analog driving signal to the direct current driving module; and the direct current driving module is configured to amplify and process the analog driving signal to obtain a direct current driving signal and output the direct current driving signal to the electromagnetic heating sheet to control the electromagnetic heating sheet to work under the direct current driving signal.

[0012] Preferably, the outer magnetic shielding cylinder, the inner magnetic shielding cylinder and the atomic clock physical unit are coaxially arranged.

[0013] Preferably, the central axis of the outer magnetic shielding cylinder is parallel to the mounting plane of the mounting seat.

[0014] Preferably, the first heat insulation layer comprises a heat insulation pad and a heat insulation foam, the heat insulation pad is wrapped on the outer wall of the outer magnetic shielding cylinder, and the heat insulation foam is wrapped on the outside of the heat insulation pad and located between the heat insulation pad and the clamp.

[0015] Preferably, the heat insulation pad is made of rock wool or silica gel.

[0016] Preferably, the clamp has a U-shaped structure, the outer magnetic shielding cylinder is arranged on the inner side of the clamp, and a gap is left between the outer magnetic shielding cylinder and the mounting seat.

[0017] According to another aspect of the present application, there is also provided an atomic clock temperature control method based on the atomic clock temperature control system as described above, the atomic clock temperature control method comprising:

[0018] Step S1: setting control parameters of a PID temperature control algorithm and a preset temperature;

[0019] Step S2: collect the temperature signal of the atomic clock physical unit by the temperature sensor and feed back the temperature signal to the temperature control unit, the temperature control unit calculates and processes signals according to the temperature signal, the preset temperature and the preset PID temperature control algorithm to obtain a driving signal, and outputs the driving signal to the electromagnetic heating sheet;

[0020] Step S3: the electromagnetic heating sheet works under the driving signal to adjust the temperature of the atomic clock physical unit.

[0021] Preferably, the temperature control unit comprises an analog-to-digital conversion module, a digital PID control module, a digital-to-analog conversion module and a direct current driving module connected in sequence, the input end of the analog-to-digital conversion module is electrically connected with the temperature sensor, and the output end of the direct current driving module is electrically connected with the electromagnetic heating sheet.

[0022] The step S2 comprises:

[0023] Step S21: collect the temperature analog signal of the atomic clock physical unit by the temperature sensor and transmit the temperature analog signal to the analog-to-digital conversion module;

[0024] Step S22: the analog-to-digital conversion module converts the temperature analog signal into a temperature digital signal and transmits the temperature digital signal to the digital PID control module;

[0025] Step S23: the digital PID control module calculates a digital driving signal according to the temperature digital signal, the preset temperature and the preset digital PID temperature control algorithm and transmits the digital driving signal to the digital-to-analog conversion module;

[0026] Step S24: the digital-to-analog conversion module converts the digital driving signal into an analog driving signal and transmits the analog driving signal to the direct current driving module;

[0027] Step S25: the direct current driving module amplifies and processes the analog driving signal to obtain a direct current driving signal and outputs the direct current driving signal to the electromagnetic heating sheet.

[0028] Compared with the prior art, the beneficial effects of the present application are that in the atomic clock temperature control system of the present application, the electromagnetic heating sheet is wrapped and arranged outside the inner magnetic shielding cylinder, the driving signal of the electromagnetic heating sheet is controlled by the temperature control unit, the overall structure is simple, the reaction speed is fast, the control precision is high, the accurate temperature control of the atomic clock physical unit can be realized, and the reliability of the atomic clock physical unit is improved; the first heat insulation layer is arranged outside the outer magnetic shielding cylinder, the second heat insulation layer is arranged between the clamp and the mounting seat, the temperature disturbance of the external temperature change on the atomic clock physical system can be weakened, and the anti-interference ability of the system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Structure diagram of the temperature control system of the atomic clock according to an embodiment of the present application.

[0030] Figure 2 Structure diagram of the temperature control system of the atomic clock according to an embodiment of the present application. Figure 1 Structure diagram of the temperature control system of the atomic clock according to an embodiment of the present application.

[0031] Figure 3 Structure diagram of the temperature control system of the atomic clock according to an embodiment of the present application.

[0032] Figure 4 Flow chart of the temperature control method of the atomic clock according to an embodiment of the present application.

[0033] Figure 5 Flow chart of the temperature control method of the atomic clock according to another embodiment of the present application.

[0034] In the drawings, 100-temperature control system, 1-mounting seat, 2-clip, 3-outer magnetic shielding cylinder, 4-inner magnetic shielding cylinder, 5-atomic clock physical unit, 6-first thermal insulation layer, 61-thermal insulation pad, 62-thermal insulation foam, 7-second thermal insulation layer, 8-electromagnetic heating sheet, 9-temperature sensor, 10-temperature control unit, 11-analog-digital conversion module, 12-digital PID control module, 13-digital-analog conversion module, 14-direct current driving module. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application. It can be understood that some technical means of the various embodiments described herein can be replaced or combined with each other without conflict.

[0036] In the description of the present application, if there are terms such as "first", "second", etc., they are only used to distinguish the described objects, and do not have any order or technical meaning. Therefore, the objects defined with "first", "second", etc. can be explicitly or implicitly included one or more objects. And "one" or "an" and the like similar words do not represent quantity limitation, but represent the existence of at least one, and "more" represents no less than two.

[0037] In the description of the present application, reference to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments", and so on, in various places in the specification are not necessarily all referring to the same embodiment, unless otherwise specifically specified.

[0038] Please refer to Figure 1 and Figure 2 , Figure 1 The structure diagram of an atomic clock temperature control system according to an embodiment of the present application, Figure 2 The structure diagram of the A part in Figure 1 The present application provides an atomic clock temperature control system 100, which comprises a mounting base 1, a clamp 2, an outer magnetic shielding cylinder 3, an inner magnetic shielding cylinder 4, an atomic clock physical unit 5, a first thermal insulation layer 6, a second thermal insulation layer 7, an electromagnetic heating sheet 8, a temperature sensor 9, and a temperature control unit 10.

[0039] The outer magnetic shielding cylinder 3 is supported and fixed on the mounting base 1 through the clamp 2, the first thermal insulation layer 6 is wrapped outside the outer magnetic shielding cylinder 3, and the second thermal insulation layer 7 is arranged between the clamp 2 and the mounting base 1. The inner magnetic shielding cylinder 4 is arranged inside the outer magnetic shielding cylinder 3, the electromagnetic heating sheet 8 is wrapped outside the inner magnetic shielding cylinder 4, and the atomic clock physical unit 5 is arranged inside the inner magnetic shielding cylinder 4. The temperature control unit 10 is arranged outside the clamp 2, the temperature sensor 9 is arranged in the atomic clock physical unit 5, and the electromagnetic heating sheet 8 and the temperature sensor 9 are electrically connected to the temperature control unit 10, respectively.

[0040] The outer magnetic shielding cylinder 3 and the inner magnetic shielding cylinder 4 are used to shield the geomagnetic field to reduce the interference of the geomagnetic field on the stability and control accuracy of the atomic clock physical unit 5. The temperature sensor 9 is used to collect the temperature signal of the atomic clock physical unit 5 and feed back the temperature signal to the temperature control unit 10. The temperature control unit 10 is used to calculate and process signals according to the temperature signal, a preset temperature, and a preset PID temperature control algorithm to obtain a driving signal, and output the driving signal to the electromagnetic heating sheet 8 to control the electromagnetic heating sheet 8 to work under the driving signal, so as to adjust the temperature of the atomic clock physical unit 5.

[0041] The electromagnetic heating sheet 8 is arranged on the outside of the inner magnetic shielding cylinder 4, the driving signal of the electromagnetic heating sheet 8 is controlled by the temperature control unit 10 through PID control, so that the temperature of the atomic clock physical unit 5 is adjusted and kept stable, the overall structure is simple, the reaction speed is fast, the control precision is high, the accurate temperature control of the atomic clock physical unit can be realized, and the reliability of the atomic clock physical unit is improved; the first heat insulation layer 6 is arranged on the outside of the outer magnetic shielding cylinder 3, and the second heat insulation layer 7 is arranged between the clamp 2 and the mounting seat 1, so that the temperature interference of the external temperature change on the atomic clock physical system is weakened, and the anti-interference ability of the system is improved.

[0042] In the preferred embodiment of the present application, the driving signal is a direct current driving signal, which can ensure that the electromagnetic heating sheet 8 has high temperature stability, and can avoid introducing noise interference in the temperature control circuit.

[0043] Further, please refer to Figure 3 , Figure 3 It is a structure schematic view of the temperature control unit, the temperature sensor and the electromagnetic heating sheet of an embodiment of the present application. In some embodiments, the temperature control unit 10 comprises an analog-to-digital conversion module 11, a digital PID control module 12, a digital-to-analog conversion module 13 and a direct current driving module 14 which are electrically connected in sequence, the input end of the analog-to-digital conversion module 11 is electrically connected with the temperature sensor 9, and the output end of the direct current driving module 14 is electrically connected with the electromagnetic heating sheet 8.

[0044] The temperature sensor 9 is used to collect the temperature analog signal of the atomic clock physical unit 5 and transmit the temperature analog signal to the analog-to-digital conversion module 11. The analog-to-digital conversion module 11 is used to convert the temperature analog signal into a temperature digital signal and transmit the temperature digital signal to the digital PID control module 12. The digital PID control module 12 is used to calculate the digital driving signal according to the temperature digital signal, the preset temperature and the preset digital PID temperature control algorithm, and transmit the digital driving signal to the digital-to-analog conversion module 13. The digital-to-analog conversion module 13 is used to convert the digital driving signal into an analog driving signal and transmit the analog driving signal to the direct current driving module 14. The direct current driving module 14 is used to amplify and process the analog driving signal to obtain a direct current driving signal, and output the direct current driving signal to the electromagnetic heating sheet 8 to control the electromagnetic heating sheet 8 to work under the direct current driving signal.

[0045] Further, the temperature control unit 10 can also be connected with an upper computer, so that the control parameters and the preset temperature of the digital PID temperature control algorithm can be injected through the upper computer.

[0046] In the application, the temperature sensor 9 can adopt a high-sensitivity temperature sensor available on the market, the analog-digital conversion module 11 can select an analog-digital conversion chip available on the market according to actual requirements, the digital-analog conversion module 13 can select a digital-analog conversion chip available on the market, the digital PID control module 12 can adopt a programmable array logic device FPGA (Field Programmable Gate Array) or a digital signal processor DSP (Digital Signal Process) with a processor core, and the direct-current driving module 14 can adopt an operational amplifier and the like available on the market. The high-precision temperature control can be realized by the digital PID control mode and the high-sensitivity temperature sensor, and the control precision can reach ±0.1℃; the electromagnetic heating sheet 8 adopts a direct-current driving mode to heat the magnetic shielding cylinder, so that high temperature stability is ensured, and noise interference introduced by the temperature control driving circuit is avoided.

[0047] In the preferred embodiment of the present application, the outer magnetic shielding cylinder 3 and the inner magnetic shielding cylinder 4 are coaxially arranged with the atomic clock physical unit 5. Further, the central axis of the outer magnetic shielding cylinder 3 is parallel to the mounting plane of the mounting seat 1, so as to ensure the control precision of the atomic clock physical unit 5 and ensure the system stability.

[0048] Please refer to Figure 1 and Figure 2 In some embodiments, the first heat insulation layer 6 includes a heat insulation pad 61 and a heat insulation foam 62, the heat insulation pad 61 is wrapped on the outer wall of the outer magnetic shielding cylinder 3, and the heat insulation foam 62 is wrapped on the outside of the heat insulation pad 61 and located between the heat insulation pad 61 and the clamp 2. The heat insulation pad 61 can be made of rock wool or silica gel. Further, the second heat insulation layer 7 can be a heat insulation pad made of rock wool or silica gel, or a combination of a heat insulation pad and a heat insulation foam. The clamp 2 is a heat conduction medium between the outer magnetic shielding cylinder 3 and the outside, and the first heat insulation layer 6 and the second heat insulation layer 7 can limit the heat exchange between the outer magnetic shielding cylinder 3 and the outside through the clamp 2, reduce the temperature interference of the outside temperature change on the atomic clock physical unit 5, thereby reducing the temperature fluctuation of the atomic clock physical unit 5 and realizing more stable temperature control.

[0049] In some embodiments, the clamp 2 has a U-shaped structure, the outer magnetic shielding cylinder 3 is arranged on the inner side of the clamp 2, and a gap is left between the outer magnetic shielding cylinder 3 and the mounting seat 1, i.e. the outer magnetic shielding cylinder 3 does not directly contact the mounting seat 1, so as to reduce heat conduction and avoid the interference of the outside temperature change on the temperature control of the atomic clock physical unit 5.

[0050] According to another aspect of the present application, a method for controlling the temperature of an atomic clock is also provided, please refer to Figure 4 , Figure 4A flow chart of an atomic clock temperature control method according to an embodiment of the present application. Based on the atomic clock temperature control system as described above, the atomic clock temperature control method comprises the following steps:

[0051] Step S1: setting control parameters of a PID temperature control algorithm and a preset temperature. The control parameters and the preset temperature can be injected by an upper computer.

[0052] Step S2: collecting a temperature signal of the atomic clock physical unit 5 by the temperature sensor 9 and feeding back the temperature signal to the temperature control unit 10; the temperature control unit 10 performs calculation and signal processing according to the temperature signal, the preset temperature and the preset PID temperature control algorithm to obtain a driving signal and outputs the driving signal to the electromagnetic heating sheet 8. Preferably, the driving signal is a direct current driving signal, which ensures that the electromagnetic heating sheet 8 has high temperature stability and avoids noise interference introduced by the temperature control driving circuit.

[0053] Step S3: the electromagnetic heating sheet 8 works under the driving signal to adjust the temperature of the atomic clock physical unit 5.

[0054] The present application uses the temperature control unit 10 to perform PID control on the driving signal of the electromagnetic heating sheet 8, which can realize accurate temperature control of the atomic clock physical unit 5 and improve the reliability of the atomic clock physical unit 5. Meanwhile, the first thermal insulation layer 6 and the second thermal insulation layer 7 can weaken the temperature interference of external temperature changes on the atomic clock physical system and improve the anti-interference ability of the system.

[0055] In another embodiment, the temperature control unit 10 comprises an analog-to-digital conversion module 11, a digital PID control module 12, a digital-to-analog conversion module 13 and a direct current driving module 14 connected in sequence, the input end of the analog-to-digital conversion module 11 is electrically connected with the temperature sensor 9, and the output end of the direct current driving module 14 is electrically connected with the electromagnetic heating sheet 8. The temperature sensor 9 can be a commercially available high-sensitivity temperature sensor, the analog-to-digital conversion module 11 can be a commercially available analog-to-digital conversion chip selected according to actual needs, the digital-to-analog conversion module 13 can be a commercially available digital-to-analog conversion chip, the digital PID control module 12 can be a programmable array logic device FPGA or a digital signal processor DSP with a processor kernel, and the direct current driving module 14 can be a commercially available operational amplifier or the like. The temperature control unit 10 can also be connected with the upper computer, so that the control parameters of the digital PID temperature control algorithm and the preset temperature can be injected by the upper computer.

[0056] Correspondingly, step S2 comprises:

[0057] Step S21: collecting a temperature analog signal of the atomic clock physical unit 5 by the temperature sensor 9 and transmitting the temperature analog signal to the analog-to-digital conversion module 11;

[0058] Step S22: The analog-digital conversion module 11 converts the temperature analog signal into a temperature digital signal and transmits the temperature digital signal to the digital PID control module 12.

[0059] Step S23: The digital PID control module 12 calculates a digital driving signal according to the temperature digital signal, the preset temperature and the preset digital PID temperature control algorithm and transmits the digital driving signal to the digital-analog conversion module 13.

[0060] Step S24: The digital-analog conversion module 13 converts the digital driving signal into an analog driving signal and transmits the analog driving signal to the direct current driving module 14.

[0061] Step S25: The direct current driving module 14 amplifies and processes the analog driving signal to obtain a direct current driving signal and outputs the direct current driving signal to the electromagnetic heating sheet 8.

[0062] Further, please refer to Figure 5 , Figure 5 the flowchart of the atomic clock temperature control method of another embodiment of the present application. In another embodiment, the atomic clock temperature control method comprises:

[0063] Step S1: Set the control parameters of the digital PID temperature control algorithm and the preset temperature T s . The control parameters and the preset temperature T s may be injected by the upper computer. The control parameters can include a sampling period T, a proportional coefficient K P , an integral coefficient K I , a differential coefficient K D , and a static output value u initial .

[0064] Step S21: Collect the temperature analog signal of the atomic clock physical unit 5 by using the temperature sensor 9 and transmit the temperature analog signal to the analog-digital conversion module 11. The temperature sensor 9 collects the temperature analog signal of the atomic clock physical unit 5 once every sampling period T and transmits the temperature analog signal to the analog-digital conversion module 11.

[0065] Step S22: The analog-digital conversion module 11 converts the temperature analog signal into a temperature digital signal T k (k is a sampling serial number, k = 0, 1, 2, …), and transmits the temperature digital signal T k to the digital PID control module 12.

[0066] Step S23: The digital PID control module 12 calculates a digital driving signal u k according to the temperature digital signal T k , the preset temperature T s and the preset digital PID temperature control algorithm.And the digital driving signal u k is transmitted to the digital-to-analog conversion module 13.

[0067]

[0068] e k is the deviation value at the kth sampling moment, e k = T k -T s , e k-1 is the deviation value at the (k-1)th sampling moment, e k-1 = T k-1 -T s .

[0069] Step S24: The digital-to-analog conversion module 13 converts the digital driving signal u k into an analog driving signal, and transmits the analog driving signal to the direct current driving module 14.

[0070] Step S25: The direct current driving module 14 amplifies and processes the analog driving signal to obtain a direct current driving signal, and outputs the direct current driving signal to the electromagnetic heating sheet 8.

[0071] Step S3: The electromagnetic heating sheet 8 works under the direct current driving signal to adjust the temperature of the atomic clock physical unit 5, so as to keep it stable.

[0072] In an embodiment, the atomic clock temperature control system and method described above can achieve a temperature control precision of ±0.1℃, realize accurate temperature control of the atomic clock physical unit, and ensure the stability and reliability of the atomic clock physical unit.

[0073] In summary, the present application provides an atomic clock temperature control system and method, which wraps the electromagnetic heating sheet outside the inner magnetic shielding cylinder, uses the temperature control unit to perform PID control on the driving signal of the electromagnetic heating sheet, has a simple overall structure, fast reaction speed, and high control precision, can realize accurate temperature control of the atomic clock physical unit, and improve the reliability of the atomic clock physical unit; the first heat insulation layer is arranged outside the outer magnetic shielding cylinder, and the second heat insulation layer is arranged between the clamp and the mounting seat, which can weaken the temperature interference of the external temperature change on the atomic clock physical system, and improve the anti-interference ability of the system.

[0074] The present application has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the present application. It must be pointed out that the disclosed embodiments do not limit the scope of the present application. On the contrary, modifications and improvements made without departing from the spirit and scope of the present application are within the scope of the patent protection of the present application.

Claims

1. An atomic clock temperature control system, characterized by: The application relates to an atomic clock magnetic shielding device, which comprises a mounting base, a clamp, an outer magnetic shielding cylinder, an inner magnetic shielding cylinder, an atomic clock physical unit, a first heat insulation layer, a second heat insulation layer, an electromagnetic heating sheet, a temperature sensor and a temperature control unit. The outer magnetic shielding cylinder is supported and fixed on the mounting base through the clamp, the first heat insulation layer is wrapped outside the outer magnetic shielding cylinder, and the second heat insulation layer is arranged between the clamp and the mounting base; the inner magnetic shielding cylinder is arranged inside the outer magnetic shielding cylinder, the electromagnetic heating sheet is wrapped outside the inner magnetic shielding cylinder, and the atomic clock physical unit is arranged inside the inner magnetic shielding cylinder; the temperature control unit is arranged outside the clamp, and the temperature sensor is arranged in the atomic clock physical unit; the electromagnetic heating sheet and the temperature sensor are electrically connected with the temperature control unit respectively. The temperature sensor is used for collecting a temperature signal of the atomic clock physical unit and feeding back the temperature signal to the temperature control unit; the temperature control unit is used for calculating and signal processing according to the temperature signal, a preset temperature and a preset PID temperature control algorithm to obtain a driving signal, and outputting the driving signal to the electromagnetic heating sheet to control the electromagnetic heating sheet to work under the driving signal. The driving signal is a direct current driving signal. The temperature control unit comprises an analog-digital conversion module, a digital PID control module, a digital-analog conversion module and a direct current driving module which are electrically connected in sequence; the input end of the analog-digital conversion module is electrically connected with the temperature sensor, and the output end of the direct current driving module is electrically connected with the electromagnetic heating sheet. The temperature sensor is used for collecting a temperature analog signal of the atomic clock physical unit and transmitting the temperature analog signal to the analog-digital conversion module; the analog-digital conversion module is used for converting the temperature analog signal into a temperature digital signal and transmitting the temperature digital signal to the digital PID control module; the digital PID control module is used for calculating a digital driving signal according to the temperature digital signal, the preset temperature and a preset digital PID temperature control algorithm and transmitting the digital driving signal to the digital-analog conversion module; the digital-analog conversion module is used for converting the digital driving signal into an analog driving signal and transmitting the analog driving signal to the direct current driving module; and the direct current driving module is used for amplifying and processing the analog driving signal to obtain a direct current driving signal and outputting the direct current driving signal to the electromagnetic heating sheet to control the electromagnetic heating sheet to work under the direct current driving signal. The outer magnetic shielding cylinder, the inner magnetic shielding cylinder and the atomic clock physical unit are coaxially arranged. The central axis of the outer magnetic shielding cylinder is parallel to the mounting plane of the mounting base. The first heat insulation layer comprises a heat insulation pad and a heat insulation foam; the heat insulation pad is wrapped outside the outer wall of the outer magnetic shielding cylinder, and the heat insulation foam is wrapped outside the heat insulation pad and located between the heat insulation pad and the clamp. The heat insulation pad is made of rock wool or silica gel. The clamp is a U-shaped structure, the outer magnetic shielding cylinder is arranged on the inner side of the clamp, and a gap is left between the outer magnetic shielding cylinder and the mounting seat; The temperature control method of the atomic clock temperature control system comprises the following steps: Step S1: set control parameters of PID temperature control algorithm and preset temperature T s ; wherein, the control parameters and the preset temperature T s are injected by the upper computer, the control parameters include sampling period T, proportional coefficient K P , integral coefficient K I , differential coefficient K D , and static output value u initial ; Step S21: Collecting the temperature analog signal of the physical unit of the atomic clock by using the temperature sensor and transmitting the temperature analog signal to the analog-digital conversion module; wherein, the temperature sensor collects the temperature analog signal of the physical unit of the atomic clock every other sampling period T and transmits the temperature analog signal to the analog-digital conversion module; Step S22: The analog-digital conversion module converts the temperature analog signal into a temperature digital signal T k (k is the sampling serial number, k=0, 1, 2……), and transmits the temperature digital signal to the digital PID control module; Step S23: The digital PID control module controls the temperature based on the digital signal T. k Preset temperature T s And a preset digital PID temperature control algorithm is used to calculate and obtain the digital drive signal u. k and the digital drive signal u k The data is transmitted to the digital-to-analog converter module; whereby, e k is the deviation value at the kth sampling instant, e k = T k -T s , e k-1 is the deviation value at the (k-1)th sampling instant, e k-1 = T k-1 -T s ; Step S24: The digital-to-analog conversion module converts the digital driving signal u k into an analog driving signal and transmits the analog driving signal to the direct current driving module; Step S25: The direct current driving module amplifies and processes the analog driving signal to obtain a direct current driving signal and outputs the direct current driving signal to the electromagnetic heating sheet; Step S3: The electromagnetic heating sheet works under the direct current driving signal to adjust the temperature of the physical unit of the atomic clock so as to keep the temperature stable.

Images