Fourier spectrometer and control method thereof

Abstract

The invention relates to the technical field of spectral analysis, in particular to a Fourier spectrometer and a control method thereof. The Fourier spectrometer provided by the invention comprises a control unit, a light receiving unit, a first detection unit, a second detection unit, an interference unit and a delay unit with a rotating structure, and the second detection unit is used for sequentially inputting a laser signal into the interference unit and the delay unit to obtain a laser interference signal, and outputting the laser interference signal to the control unit to obtain a sampling clock signal for controlling the sampling frequency of interference signal sampling. The second detection unit and the delay unit with the rotating structure are introduced, so that the spectrograph can control the sampling process more flexibly, and the sampling accuracy and efficiency are improved. By accurately controlling the change of the optical path difference, the resolution of the spectral data is improved, and the spectral characteristics of the sampling light can be analyzed more accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of spectrum analysis, and in particular to a Fourier spectrometer and a control method thereof. Background Art

[0002] Fourier spectrometers have the advantages of multi-channel and high throughput, which enables them to obtain high signal-to-noise ratio and high-resolution spectral data in a wide spectral band. A single observation can be used for the inversion of multiple components, which is particularly suitable for general detection and is the detection instrument that researchers focus on developing. This type of spectrometer can not only measure the absorption and reflection spectra of various gas, solid and liquid samples, but also can be used for short-time chemical reaction measurement, and has a wide range of applications in the fields of electronics, chemical engineering, environment, medicine, etc.

[0003] Fourier spectrometers generally use the reciprocating motion of a motor to drive optical elements to cause changes in the optical path difference. The reciprocating motion of the motor can form a larger optical path difference and a higher spectral resolution. However, the frequency of the motor's reciprocating motion is generally low, making it difficult to detect rapidly occurring biological and chemical changes. Summary of the invention

[0004] The invention provides a Fourier spectrometer and a control method thereof, which are used to solve the problem in the prior art that the frequency of the reciprocating motion of a motor in the Fourier spectrometer is low, making it difficult to detect rapidly occurring biological and chemical changes.

[0005] The present invention provides a Fourier spectrometer, which comprises a control unit, a light receiving unit, a first detection unit, a second detection unit, an interference unit and a delay unit with a rotating structure; The light receiving unit is used to input the light to be detected into the interference unit; The interference unit is used to separate the light to be detected into a first light and a second light, wherein the first light is directly irradiated to the first detection unit, and the second light is reflected to the first detection unit after passing through the delay unit; The first detection unit is used to output an interference signal of the first light and the second light to the control unit; The delay unit is used to change the optical path of the second light so that the first light and the second light generate an interference signal; and is also used to generate an electrical signal and output it to the control unit; The second detection unit is used to input the laser signal into the interference unit and the delay unit in sequence to obtain a laser interference signal, and output the laser interference signal to the control unit; The control unit is used to process the interference signal; generate a sampling clock signal according to the laser interference signal to control the sampling frequency of the interference signal sampling by the first detection unit; and generate a sampling pulse signal according to the electrical signal to control the first detection unit to turn on or off the interference signal sampling.

[0006] According to the Fourier spectrometer provided by the present invention, the delay unit with a rotating structure comprises: a turntable with a servo motor, the turntable has two parallel first reflectors and a second reflector, and the turntable also includes a third reflector, and the two ends of the third reflector are respectively installed with a first photodetector and a second photodetector; The first reflector is used to receive the second light emitted by the interference unit and reflect it to the second reflector; The third reflector is used to receive the light emitted by the second reflector and reflect it to the interference unit; The first photodetector and the second photodetector are used to convert the laser light received at the edge of the third reflector into the electrical signal, and output the electrical signal to the control unit to generate a sampling pulse signal; The control unit is specifically configured to start sampling and outputting the interference signal of the first light and the second light to the control unit when the first photodetector generates an electrical signal; and stop outputting the interference signal of the first light and the second light to the control unit when the second photodetector generates an electrical signal; The servo motor is used to control the rotation of the turntable according to the control instruction of the control unit.

[0007] According to the Fourier spectrometer provided by the present invention, the laser interference signal is a cosine signal; The control unit is specifically used to generate a sampling clock according to the peak value or valley value or zero-crossing position of the cosine signal to control the sampling frequency of the interference signal sampling performed by the first detection unit.

[0008] According to the Fourier spectrometer provided by the present invention, any one of the first reflector, the second reflector and the third reflector can be any one of a plane mirror, a corner cube prism, a roof prism and an involute reflector.

[0009] According to the Fourier spectrometer provided by the present invention, the control unit is specifically used to process the interference signal to obtain spectral information on the light to be detected, and the processing methods include but are not limited to filtering, toe-cutting, phase correction and Fourier transform.

[0010] According to the Fourier spectrometer provided by the present invention, the sampling pulse signal is a TTL signal.

[0011] The present invention also provides a control method for a Fourier spectrometer, which is applied to any one of the above-mentioned Fourier spectrometers, comprising: processing the interference signal; Acquire the laser interference signal collected by the second detection unit to generate a sampling clock signal; acquire the electrical signal collected by the delay unit to generate a sampling pulse signal; The sampling frequency of the interference signal sampling of the first detection unit is controlled according to the sampling clock signal; and the first detection unit is controlled to start or stop the interference signal sampling according to the sampling pulse signal.

[0012] According to the control method of the Fourier spectrometer provided by the present invention, controlling the first detection unit to start or stop interference signal sampling according to the sampling pulse signal includes: When the first photodetector generates an electrical signal, the sampling pulse signal is generated to start sampling and outputting the interference signal to the control unit; When the second photodetector generates an electrical signal, the sampling pulse signal is generated to stop sampling and outputting the interference signal to the control unit.

[0013] According to the control method of the Fourier spectrometer provided by the present invention, the laser interference signal is a cosine signal; and the sampling frequency of the interference signal sampling of the first detection unit is controlled according to the sampling clock signal, including: The sampling clock signal is generated according to the peak value, valley value or zero value of the cosine signal to control the sampling frequency of the first detection unit for sampling the interference signal.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the control method of any of the above-mentioned Fourier spectrometers is implemented.

[0015] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the control method of any one of the Fourier spectrometers described above is implemented.

[0016] The present invention provides a Fourier spectrometer and a control method thereof. By introducing a second detection unit and a delay unit with a rotating structure, the spectrometer can control the sampling process more flexibly. The rotating structure has high stability and speed, and improves the accuracy and efficiency of sampling. By accurately controlling the change of the optical path difference, the resolution of the spectral data is improved, which helps to more accurately analyze the spectral characteristics of the sampled light. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is one of the structural schematic diagrams of a Fourier spectrometer provided by the present invention.

[0019] Figure 2 This is the second structural schematic diagram of a Fourier spectrometer provided by the present invention.

[0020] Figure 3 It is a schematic diagram of the rotation state of the servo motor in the delay unit provided by the present invention.

[0021] Figure 4 A schematic diagram of the principle of obtaining a sampling clock signal provided by the present invention.

[0022] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the descriptions used in this way can be interchanged where appropriate, so that the embodiments can be implemented in a sequence other than that illustrated or described in the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are clearly listed, but may include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices. The naming or numbering of the steps that appear in the present application does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The process steps that have been named or numbered can change the execution order according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved. The division of modules in this application is a logical division. There may be other division methods when it is implemented in actual applications. For example, multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between units can be electrical or other similar forms, which are not limited in this application. In addition, the modules or submodules described as separate components may or may not be physically separated, may or may not be physical units, or may be distributed in multiple circuit units, and some or all of the units may be selected according to actual needs to achieve the purpose of the present application.

[0025] Combine the following Figure 1-Figure 5 The specific contents of the present invention are described.

[0026] The invention provides a Fourier spectrometer and a control method thereof, which are used to solve the problem that the frequency of the reciprocating motion of a motor in the Fourier spectrometer in the prior art is low, making it difficult to detect rapidly occurring biological and chemical changes.

[0027] like Figure 1 , which is a schematic diagram of the structure of a Fourier spectrometer provided by the present invention, the Fourier spectrometer includes a control unit 60, a light receiving unit 10, a first detection unit 30, a second detection unit 50, an interference unit 20 and a delay unit 40 with a rotating structure.

[0028] The light receiving unit 10 is used to input the light to be detected into the interference unit 20; The interference unit 20 is used to separate the light to be detected into a first light and a second light, wherein the first light is directly irradiated to the first detection unit 30, and the second light is reflected to the first detection unit 30 after passing through the delay unit 40; A first detection unit 30, configured to output an interference signal between the first light and the second light to a control unit 60; The delay unit 40 is used to change the optical path of the second light so that the first light and the second light generate an interference signal; and is also used to generate an electrical signal and output it to the control unit 60; The second detection unit 50 is used to input the laser signal into the interference unit 20 and the delay unit 40 in sequence, obtain a laser interference signal, and output the laser interference signal to the control unit 60; In the embodiment of the present invention, after the laser interference signal is input to the control unit 60, a sampling clock signal is obtained.

[0029] The control unit 60 is used to process the interference signal; generate a sampling clock signal according to the laser interference signal to control the sampling frequency of the interference signal sampling by the first detection unit 30; generate a sampling pulse signal according to the electrical signal to control the first detection unit 30 to turn on or off the interference signal sampling.

[0030] Specifically, see Figure 2 As shown, the light receiving unit 10 inputs the light to be detected to the interference unit 20 through the light receiving lens. The light to be detected is sunlight or light emitted or reflected by an object.

[0031] See also Figure 2 As shown, the interference unit 20 includes a reflector 201, a semi-transparent and semi-reflective mirror 202, a reflector 203, and a reflector 204; the interference unit 20 divides the signal light collected by the light receiving unit 10 into two beams, a first light beam and a second light beam; the first light beam is reflected by the reflector 203 of the interference unit 20 and passes through the semi-transparent and semi-reflective mirror 202 to enter the first detection unit, and the second light beam enters the delay unit 40; See also Figure 2 As shown, the second light entering the delay unit 40 is reflected by the three-sided reflector and then returns to the interference unit and is reflected by the semi-transparent and semi-reflective mirror 202 to enter the first detection unit 30. In the turntable with a servo motor, as the servo motor rotates, the optical path difference of the second light transmitted between the three-sided reflector changes, so that when the first light and the second light arrive at the first detection unit 30, a time difference is generated, thereby causing the first light and the second light to generate an interference signal.

[0032] Specifically, the first detection unit 30 includes a first detector 301 and a condenser lens 302 . After the first light and the second light pass through the condenser lens 302 respectively, the generated interference signals are output to the control unit 60 through the first detector 301 .

[0033] In a possible implementation, Figure 2 As shown, the delay unit 40 with a rotating structure includes: a turntable with a servo motor, on which there are two parallel first reflectors 401 and second reflectors 402, and outside the turntable there is also a third reflector 403, at both ends of which are respectively mounted a first photodetector 404 and a second photodetector 405; Specifically, the first reflector 401 is used to receive the second light emitted by the interference unit 20 and reflect it to the second reflector 402; the third reflector 403 is used to receive the light emitted by the second reflector 402 and reflect it to the interference unit 20; the first photodetector 404 and the second photodetector 405 are used to convert the laser received at the edge of the third reflector 403 into an electrical signal, and output it to the control unit 60 to generate a sampling pulse signal.

[0034] Next, the specific process of the control unit 60 generating a sampling pulse signal according to the electrical signal to control the first detection unit 30 to start or stop the interference signal sampling is described. The sampling pulse signal includes a start sampling pulse signal and an end sampling pulse signal.

[0035] The control unit 60 is specifically used for generating a start sampling pulse signal according to the electrical signal when the first photodetector 404 generates an electrical signal, so as to start sampling and outputting the interference signal of the first light and the second light to the control unit 60; when the second photodetector 405 generates an electrical signal, the control unit 60 is used for generating an end sampling pulse signal according to the electrical signal, so as to stop outputting the interference signal of the first light and the second light to the control unit 60.

[0036] Next, after the laser emitted by the second detection unit 50 passes through the interference unit 20 and the delay unit 40, a laser interference signal is obtained, and the laser interference signal is input to the control unit 60. The control unit 60 generates a sampling clock signal according to the laser interference signal to control the sampling frequency of the interference signal sampling by the first detection unit 30.

[0037] The second detection unit 50, such as Figure 2 As shown, the second detection unit 50 includes a second detector 501 and a laser 502 .

[0038] Specifically, after the second detection unit 50 emits laser light through the laser 502 and reflects it through the reflector 203, the interference unit 20 divides the laser light into two beams, the first laser light and the second laser light; the first laser light is reflected by the reflector 201 of the interference unit 20, passes through the semi-transparent and semi-reflective mirror 202 and enters the reflector 204, and is reflected by the reflector 204 to the second detector 501, thereby obtaining a laser interference signal; the second laser light enters the delay unit 40, as shown in the above-mentioned process of the second light light being transmitted in the delay unit 40. The second laser light can be received by the first photodetector 404 and the second photodetector 405, and the second laser light is converted into an electrical signal and output to the control unit 60; For example, see Figure 3 As shown, there are two states of servo motor rotation. Figure 3 The upper half of the second laser is irradiated on the first photodetector 404, marking the start of data collection of the interference signal. Figure 3 The lower half of the diagram shows the second laser irradiating the second photodetector 405, marking the end of data collection of the interference signal.

[0039] The servo motor is used to control the rotation of the turntable according to the control instruction of the control unit 60.

[0040] In an embodiment of the present invention, the control unit 60 receives and parses the instructions of the host computer, converts them into machine instructions, and generates a driving current to the servo motor to control the speed and direction of the motor. Generally, a servo motor is selected in high-speed rotation situations. The servo motor itself contains an encoder to control the speed of the motor to remain constant.

[0041] In a possible implementation manner, any one of the first reflector 401 , the second reflector 402 and the third reflector 403 may be any one of a plane mirror, a corner cube prism, a roof prism and an involute reflector.

[0042] In a possible implementation, the sampling clock signal is a cosine signal; The control unit 60 is specifically used to generate a sampling clock according to the peak value or valley value or zero-crossing position of the cosine signal to control the sampling frequency of the interference signal sampling performed by the first detection unit 30 .

[0043] The control unit 60 detects the peak and valley values ​​of the sampling clock signal and converts them into a sampling clock. The control unit 60 uses the sampling clock to collect the interference signal, and can select the rising edge or the falling edge. In order to meet the sampling theorem and sampling efficiency, the sampling clock can be multiplied and divided.

[0044] Optionally, the control unit 60 may detect positions of other phases of the sampling clock signal and convert them into the sampling clock.

[0045] In a possible implementation manner, the sampling pulse signal is a TTL signal.

[0046] Specifically, Figure 4 The schematic diagram of the principle of obtaining the sampling clock signal provided by the present invention is as follows: Figure 4 As shown, the first line is the sampling pulse signal, which is valid at high level and starts to collect data during the high level period. The cosine signal in the third line is the laser interference signal, which is converted into a sampling clock signal, i.e., a cosine variation signal. The peak value is converted into a high level and the valley value is converted into a low level through the controller, which is used as the sampling clock to sample the interference signal of the sample.

[0047] like Figure 4 The middle part shown is the interference signal of the sample. Since the reflected light or emitted light of the sample is generally a wide-spectrum light signal, its interference signal is maximum at zero optical path and attenuated at both ends. The signal is collected once every rotation of the servo motor.

[0048] In a possible implementation, the control unit is specifically used to process the interference signal to obtain spectral information on the light to be detected, and the processing methods include but are not limited to filtering, apodization, phase correction and Fourier transform.

[0049] In the embodiment of the present invention, since the spatial positions between the sampling points are measured in units of laser wavelength and are uniform, the fast Fourier transform FFT can be used directly, and the calculation speed is relatively fast.

[0050] The present invention can achieve at least one of the following beneficial effects by adopting the above-mentioned Fourier spectrometer: 1. By introducing the second detection unit and the delay unit with a rotating structure, the spectrometer can control the sampling process more flexibly, improving the accuracy and efficiency of sampling. By precisely controlling the change of the optical path difference, the resolution of the spectral data is improved, which helps to more accurately analyze the spectral characteristics of the sampled light.

[0051] 2. Compared with traditional swing-scan and push-scan Fourier spectrometers, it has a higher measurement speed, and the delay unit with a rotating structure can be used to measure spectral changes in rapidly changing scenes. Since the sampling position is measured in units of laser wavelength and is equally spaced in the frequency domain, Fourier transform can be used directly, and the calculation speed is faster.

[0052] 3. Since the enable signal (i.e., sampling pulse signal) controls the start and end of acquisition, only the interference signal of useful information is collected, and there is no need to intercept the collected signal data, thereby improving processing efficiency.

[0053] The control method of the Fourier spectrometer provided by the present invention is described below. The control method of the Fourier spectrometer described below and the specific application of the Fourier spectrometer described above can be referred to each other.

[0054] The present invention also provides a control method for a Fourier spectrometer, which is applied to any one of the above-mentioned Fourier spectrometers, comprising: Processing interference signals; Acquire the laser interference signal collected by the second detection unit to generate a sampling clock signal; acquire the electrical signal collected by the delay unit to generate a sampling pulse signal; The sampling frequency of the first detection unit for sampling the interference signal is controlled according to the sampling clock signal; and the first detection unit is controlled to start or stop the interference signal sampling according to the sampling pulse signal.

[0055] In a possible implementation, controlling the first detection unit to start or stop interference signal sampling according to the sampling pulse signal includes: When the first photodetector generates an electrical signal, a sampling pulse signal is generated to start sampling and outputting the interference signal to the control unit; when the second photodetector generates an electrical signal, a sampling pulse signal is generated to stop sampling and outputting the interference signal to the control unit.

[0056] In a possible implementation, the laser interference signal is a cosine signal; and controlling the sampling frequency of the interference signal sampling by the first detection unit according to the sampling clock signal includes: A sampling clock is generated according to the peak value or valley value or zero-crossing position of the cosine signal to control the sampling frequency of the interference signal sampling performed by the first detection unit.

[0057] Figure 5 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530 and a communication bus 540, wherein the processor 510, the communication interface 520 and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute the control method of the Fourier spectrometer, which includes: processing the interference signal; acquiring the laser interference signal collected by the second detection unit to generate a sampling clock signal; acquiring the electrical signal collected by the delay unit to generate a sampling pulse signal; controlling the sampling frequency of the first detection unit for sampling the interference signal according to the sampling clock signal; and controlling the first detection unit to turn on or off the interference signal sampling according to the sampling pulse signal.

[0058] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0059] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the Fourier spectrometer provided by the above methods, which method includes: processing the interference signal; obtaining the laser interference signal collected by the second detection unit to generate a sampling clock signal; obtaining the electrical signal collected by the delay unit to generate a sampling pulse signal; controlling the sampling frequency of the interference signal sampling by the first detection unit according to the sampling clock signal; and controlling the first detection unit to turn on or off the interference signal sampling according to the sampling pulse signal.

[0060] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the control method of the Fourier spectrometer provided by the above-mentioned methods, the method comprising: processing the interference signal; acquiring the laser interference signal collected by the second detection unit to generate a sampling clock signal; acquiring the electrical signal collected by the delay unit to generate a sampling pulse signal; controlling the sampling frequency of the interference signal sampling by the first detection unit according to the sampling clock signal; and controlling the first detection unit to turn on or off the interference signal sampling according to the sampling pulse signal.

[0061] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0062] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Fourier spectrometer, characterized in that: The Fourier spectrometer comprises a control unit, a light receiving unit, a first detection unit, a second detection unit, an interference unit and a delay unit with a rotating structure; The light receiving unit is used to input the light to be detected into the interference unit; The interference unit is used to separate the light to be detected into a first light and a second light, wherein the first light is directly irradiated to the first detection unit, and the second light is reflected to the first detection unit after passing through the delay unit; The first detection unit is used to output an interference signal of the first light and the second light to the control unit; The delay unit is used to change the optical path of the second light so that the first light and the second light generate an interference signal; and is also used to generate an electrical signal and output it to the control unit; The second detection unit is used to input the laser signal into the interference unit and the delay unit in sequence to obtain a laser interference signal, and output the laser interference signal to the control unit; The control unit is used to process the interference signal; generate a sampling clock signal according to the laser interference signal to control the sampling frequency of the interference signal sampling by the first detection unit; and generate a sampling pulse signal according to the electrical signal to control the first detection unit to turn on or off the interference signal sampling.

2. The Fourier spectrometer according to claim 1, characterized in that: The delay unit with a rotating structure comprises: a turntable with a servo motor, the turntable has two parallel first and second reflectors, and the turntable also includes a third reflector, and the two ends of the third reflector are respectively installed with a first photodetector and a second photodetector; The first reflector is used to receive the second light emitted by the interference unit and reflect it to the second reflector; The third reflector is used to receive the light emitted by the second reflector and reflect it to the interference unit; The first photodetector and the second photodetector are used to convert the laser light received at the edge of the third reflector into the electrical signal, and output the electrical signal to the control unit to generate a sampling pulse signal; The control unit is specifically configured to start sampling and outputting the interference signal of the first light and the second light to the control unit when the first photodetector generates an electrical signal; and stop outputting the interference signal of the first light and the second light to the control unit when the second photodetector generates an electrical signal; The servo motor is used to control the rotation of the turntable according to the control instruction of the control unit.

3. The Fourier spectrometer according to claim 1, characterized in that: The laser interference signal is a cosine signal; The control unit is specifically used to generate a sampling clock according to the peak value or valley value or zero-crossing position of the cosine signal to control the sampling frequency of the interference signal sampling performed by the first detection unit.

4. The Fourier spectrometer according to claim 2, characterized in that: Any one of the first reflector, the second reflector and the third reflector may be any one of a plane mirror, a corner cube prism, a roof prism and an involute reflector.

5. The Fourier spectrometer according to claim 1, characterized in that: The control unit is specifically used to process the interference signal to obtain spectral information on the light to be detected, and the processing methods include but are not limited to filtering, toe-cutting, phase correction and Fourier transform.

6. The Fourier spectrometer according to claim 1, characterized in that: The sampling pulse signal is a TTL signal.

7. A control method for a Fourier spectrometer, characterized in that: The Fourier spectrometer used in any one of claims 1 to 6 comprises: processing the interference signal; Acquire the laser interference signal collected by the second detection unit to generate a sampling clock signal; acquire the electrical signal collected by the delay unit to generate a sampling pulse signal; The sampling frequency of the interference signal sampling of the first detection unit is controlled according to the sampling clock signal; and the first detection unit is controlled to start or stop the interference signal sampling according to the sampling pulse signal.

8. The control method of the Fourier spectrometer according to claim 7, characterized in that: Controlling the first detection unit to start or stop interference signal sampling according to the sampling pulse signal includes: When the first photodetector generates an electrical signal, the sampling pulse signal is generated to start sampling and outputting the interference signal to the control unit; When the second photodetector generates an electrical signal, the sampling pulse signal is generated to stop sampling and outputting the interference signal to the control unit.

9. The control method of the Fourier spectrometer according to claim 7, characterized in that: The laser interference signal is a cosine signal; and the sampling frequency of the interference signal sampling by the first detection unit is controlled according to the sampling clock signal, including: The sampling clock signal is generated according to the peak value, valley value or zero value of the cosine signal to control the sampling frequency of the first detection unit for sampling the interference signal.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the control method of the Fourier spectrometer according to any one of claims 7 to 9 is implemented.

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