A Fourier spectrometer and its control method

Abstract

The present application relates to the technical field of spectral analysis, and particularly relates to a Fourier spectrometer and a control method thereof. The Fourier spectrometer provided by the present application 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 second detection unit is used for sequentially inputting a laser signal to 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, which is used for controlling the sampling frequency of the interference signal. The present application introduces the second detection unit and the delay unit with the rotating structure, so that the sampling process of the spectrometer can be more flexibly controlled, and the accuracy and efficiency of the sampling are improved. By accurately controlling the change of the optical path difference, the resolution of the spectral data is improved, which is helpful for more accurately analyzing the spectral characteristics of the sampling light.

Description

Technical Field

[0001] This invention relates to the technical field of spectral analysis, and more particularly to a Fourier spectrometer and its control method. Background Technology

[0002] Fourier transform spectrometers, with their multi-channel and high-throughput advantages, can acquire high signal-to-noise ratio and high-resolution spectral data over a wide spectral range. A single observation can be used for the inversion of multiple components, making them particularly suitable for bulk detection and a key instrument for researchers. This type of spectrometer can not only measure the absorption and reflectance spectra of various gaseous, solid, and liquid samples, but also be used for short-time chemical reaction measurements, finding wide applications in electronics, chemical engineering, environmental science, and medicine.

[0003] Fourier spectrometers typically use the reciprocating motion of an electric motor to drive optical elements, causing changes in optical path difference. The reciprocating motion of the motor can create a relatively large optical path difference, resulting in high 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] This invention provides a Fourier spectrometer and its control method to solve the problem that the reciprocating motion frequency of the motor in the existing Fourier spectrometer is low, making it difficult to detect rapid biological and chemical changes.

[0005] The present invention provides a Fourier spectrometer, which includes a control unit, a light-collecting unit, a first detection unit, a second detection unit, an interferometer unit, and a delay unit with a rotation structure;

[0006] The light receiving unit is used to input the light to be detected into the interference unit;

[0007] The interference unit is used to split the light to be detected into a first light and a second light. The first light directly illuminates the first detection unit, and the second light is reflected to the first detection unit after passing through the delay unit.

[0008] The first detection unit is used to output the interference signal between the first light beam and the second light beam to the control unit;

[0009] The delay unit is used to change the optical path of the second light ray so that the first light ray and the second light ray generate an interference signal; it is also used to generate an electrical signal output to the control unit.

[0010] The second detection unit is used to input the laser signal sequentially into the interference unit and the delay unit to obtain the laser interference signal, and then output the laser interference signal to the control unit;

[0011] The control unit is used to process the interference signal; generate a sampling clock signal based on the laser interference signal to control the sampling frequency of the first detection unit in sampling the interference signal; and generate a sampling pulse signal based on the electrical signal to control the first detection unit to turn on or off interference signal sampling.

[0012] According to the Fourier spectrometer provided by the present invention, the delay unit with a rotating structure includes: a turntable with a servo motor, two parallel first and second reflecting mirrors on the turntable, and a third reflecting mirror outside the turntable, wherein a first photodetector and a second photodetector are respectively installed at both ends of the third reflecting mirror.

[0013] The first reflector is used to receive the second light emitted by the interference unit and reflect it to the second reflector;

[0014] The third reflecting mirror is used to receive the light emitted by the second reflecting mirror and reflect it to the interference unit;

[0015] The first photodetector and the second photodetector are used to convert the laser received at the edge of the third reflector into the electrical signal and output it to the control unit to generate a sampling pulse signal;

[0016] The control unit is specifically configured to, when the first photodetector generates an electrical signal, start sampling and outputting the interference signal of the first light beam and the second light beam to the control unit; and when the second photodetector generates an electrical signal, stop outputting the interference signal of the first light beam and the second light beam to the control unit.

[0017] The servo motor is used to control the rotation of the turntable according to the control instructions of the control unit.

[0018] In the Fourier spectrometer provided by the present invention, the laser interference signal is a cosine signal;

[0019] The control unit is specifically used to generate a sampling clock based on the peak, valley, or zero-crossing position of the cosine signal, so as to control the sampling frequency of the first detection unit for sampling the interference signal.

[0020] According to the Fourier spectrometer provided by the present invention, any one of the first, second, and third reflecting mirrors can be any one of a plane mirror, a cornerstone prism, a roof prism, and an involute mirror.

[0021] 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. The processing methods include, but are not limited to, filtering, apodization, phase correction, and Fourier transform.

[0022] In the Fourier spectrometer provided by the present invention, the sampling pulse signal is a TTL signal.

[0023] The present invention also provides a control method for a Fourier spectrometer, applicable to any of the Fourier spectrometers described above, comprising:

[0024] Process the interference signal;

[0025] The laser interference signal collected by the second detection unit is acquired to generate a sampling clock signal; the electrical signal collected by the delay unit is acquired to generate a sampling pulse signal;

[0026] The sampling frequency of the first detection unit for sampling the interference signal is controlled according to the sampling clock signal; and the sampling pulse signal is used to control the first detection unit to turn the sampling of the interference signal on or off.

[0027] According to the control method of the Fourier spectrometer provided by the present invention, the first detection unit is controlled to turn on or off interference signal sampling according to the sampling pulse signal, including:

[0028] When the first photodetector generates an electrical signal, it generates the sampling pulse signal to begin sampling and outputting the interference signal to the control unit;

[0029] When the second photodetector generates an electrical signal, it generates the sampling pulse signal to stop the sampling and output of the interference signal to the control unit.

[0030] According to the control method of the Fourier spectrometer provided by the present invention, the laser interference signal is a cosine signal; the step of controlling the sampling frequency of the first detection unit to sample the interference signal according to the sampling clock signal includes:

[0031] The sampling clock signal is generated based on the peak, valley, or zero value of the cosine signal to control the sampling frequency of the first detection unit in sampling the interference signal.

[0032] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of any of the Fourier spectrometers described above.

[0033] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements a control method for any of the Fourier spectrometers described above.

[0034] This invention provides a Fourier spectrometer and its control method. By introducing a second detection unit and a delay unit with a rotating structure, the spectrometer can more flexibly control the sampling process. The rotating structure has high stability and speed, improving the accuracy and efficiency of sampling. By precisely controlling the change in optical path difference, the resolution of spectral data is improved, which helps to more accurately resolve the spectral characteristics of the sampled light. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is one of the structural schematic diagrams of a Fourier spectrometer provided by the present invention.

[0037] Figure 2 This is the second schematic diagram of the structure of a Fourier spectrometer provided by the present invention.

[0038] Figure 3 This is a schematic diagram of the state of the servo motor rotation in the delay unit provided by the present invention.

[0039] Figure 4 This is a schematic diagram illustrating the principle of acquiring the sampling clock signal provided by the present invention.

[0040] Figure 5 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such descriptions can be used interchangeably where appropriate to allow embodiments to be implemented in a sequence other than that illustrated or described in this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules is not necessarily limited to those explicitly listed, but may include other steps or modules not explicitly listed or inherent to such processes, methods, products, or devices. The naming or numbering of steps appearing in this application does not imply that the steps in the method flow must be performed in the chronological / logical order indicated by the naming or numbering. The execution order of named or numbered process steps can be changed according to the desired technical purpose, as long as the same or similar technical effect is achieved. The module division described in this application is a logical division. In practical applications, there may be other division methods. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the shown or discussed mutual coupling, direct coupling, or communication connection may be through some interface, and the indirect coupling or communication connection between units may be electrical or other similar forms, none of which are limited in this application. Furthermore, the modules or sub-modules 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. Some or all of the units can be selected to achieve the purpose of the solution in this application according to actual needs.

[0043] The following is combined Figures 1-5 The specific contents of this invention are described below.

[0044] This invention provides a Fourier spectrometer and its control method to solve the problem that the reciprocating motion frequency of the motor in the existing Fourier spectrometer is low, making it difficult to detect rapid biological and chemical changes.

[0045] like Figure 1 The figure shown is a schematic diagram of a Fourier spectrometer provided by the present invention. The Fourier spectrometer includes a control unit 60, a light-collecting unit 10, a first detection unit 30, a second detection unit 50, an interference unit 20, and a delay unit 40 with a rotation structure.

[0046] The light receiving unit 10 is used to input the light to be detected into the interference unit 20;

[0047] The interference unit 20 is used to split the light to be detected into a first light and a second light. The first light directly illuminates the first detection unit 30, and the second light is reflected to the first detection unit 30 after passing through the delay unit 40.

[0048] The first detection unit 30 is used to output the interference signal of the first light beam and the second light beam to the control unit 60;

[0049] The delay unit 40 is used to change the optical path of the second light ray so that the first light ray and the second light ray can generate an interference signal; it is also used to generate an electrical signal output to the control unit 60.

[0050] The second detection unit 50 is used to input the laser signal sequentially into the interference unit 20 and the delay unit 40 to obtain the laser interference signal, and then output the laser interference signal to the control unit 60.

[0051] In an embodiment of the present invention, after the laser interference signal is input to the control unit 60, a sampling clock signal is obtained.

[0052] The control unit 60 is used to process the interference signal; generate a sampling clock signal based on the laser interference signal to control the sampling frequency of the first detection unit 30 in sampling the interference signal; and generate a sampling pulse signal based on the electrical signal to control the first detection unit 30 to turn on or off interference signal sampling.

[0053] Specifically, see Figure 2 As shown, the light receiving unit 10 inputs the light to be detected to the interference unit 20 through a light receiving lens. The light to be detected is sunlight or light emitted or reflected by an object.

[0054] See Figure 2 As shown, the interference unit 20 includes a reflector 201, a semi-transparent mirror 202, a reflector 203, and a reflector 204. The interference unit 20 splits the signal light collected by the light receiving unit 10 into two beams, a first beam and a second beam. The first beam is reflected by the reflector 203 of the interference unit 20 and passes through the semi-transparent mirror 202 to enter the first detection unit, while the second beam enters the delay unit 40.

[0055] See Figure 2 As shown, the second light entering the delay unit 40 is reflected by the three-sided mirror and returns to the interference unit. It is then reflected by the semi-transparent mirror 202 and enters the first detection unit 30. In the turntable with the servo motor, as the servo motor rotates, the optical path difference of the second light transmitted between the three-sided mirror changes, causing a time difference when the first light and the second light arrive at the first detection unit 30, thereby causing the first light and the second light to generate an interference signal.

[0056] Specifically, the first detection unit 30 includes a first detector 301 and a condenser lens 302. After the first light beam and the second light beam pass through the condenser lens 302, the resulting interference signal is output to the control unit 60 through the first detector 301.

[0057] In one possible implementation, such as Figure 2 As shown, the delay unit 40 with a rotating structure includes: a turntable with a servo motor, two parallel first reflectors 401 and second reflectors 402 on the turntable, and a third reflector 403 outside the turntable. A first photodetector 404 and a second photodetector 405 are respectively installed at both ends of the third reflector 403.

[0058] 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.

[0059] The following describes the specific process by which the control unit 60 generates sampling pulse signals based on electrical signals to control the first detection unit 30 to turn on or off interference signal sampling. The sampling pulse signals include a start sampling pulse signal and a stop sampling pulse signal.

[0060] The control unit 60 is specifically configured to generate a start sampling pulse signal based on 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; and to generate an end sampling pulse signal based on the electrical signal when the second photodetector 405 generates an electrical signal, so as to stop outputting the interference signal of the first light and the second light to the control unit 60.

[0061] The following describes how the laser emitted by the second detection unit 50 passes through the interference unit 20 and the delay unit 40 to obtain a laser interference signal, which is then input to the control unit 60. The control unit 60 generates a sampling clock signal based on the laser interference signal to control the sampling frequency of the first detection unit 30 in sampling the interference signal.

[0062] 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.

[0063] Specifically, after the laser emitted by the laser 502 from the second detection unit 50 is reflected by the reflector 203, the interference unit 20 splits the laser into two beams, a first laser and a second laser. The first laser, after being reflected by the reflector 201 of the interference unit 20, passes through the semi-transparent mirror 202 and enters the reflector 204, and is reflected by the reflector 204 to the second detector 501, thus obtaining a laser interference signal. The second laser enters the delay unit 40, as described above regarding the transmission process of the second light beam in the delay unit 40. The second laser can be received by the first photodetector 404 and the second photodetector 405, and the second laser can be converted into an electrical signal, which is then output to the control unit 60.

[0064] For example, see Figure 3 The image shows two states of servo motor rotation. Figure 3 The upper part of the image shows the second laser illuminating the first photodetector 404, marking the start of data acquisition for the interference signal. Figure 3 The lower half of the image shows the second laser illuminating the second photodetector 405, marking the end of the data acquisition for the interference signal.

[0065] A servo motor is used to control the rotation of the turntable according to the control commands of the control unit 60.

[0066] In an embodiment of the present invention, the control unit 60 receives and parses the instructions from the host computer, converts them into machine instructions, and generates a drive current to the servo motor to control the speed and direction of the motor. Generally, in high-speed rotation applications, a servo motor is selected. The servo motor itself contains an encoder to control the speed of the motor to remain constant.

[0067] In one possible implementation, any one of the first reflector 401, the second reflector 402, and the third reflector 403 can be any one of a plane mirror, a cornerstone prism, a roof prism, and an involute reflector.

[0068] In one possible implementation, the sampling clock signal is a cosine signal;

[0069] The control unit 60 is specifically used to generate a sampling clock based on the peak, valley or zero-crossing position of the cosine signal, so as to control the sampling frequency of the first detection unit 30 for sampling the interference signal.

[0070] 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 this sampling clock to acquire the interference signal, and can select either the rising edge or the falling edge. To satisfy the sampling theorem and improve sampling efficiency, the sampling clock can be multiplied or divided.

[0071] Optionally, the control unit 60 can detect the position of other phases of the sampling clock signal and convert them into a sampling clock.

[0072] In one possible implementation, the sampling pulse signal is a TTL signal.

[0073] Specifically Figure 4 This is a schematic diagram illustrating the principle of acquiring the sampling clock signal provided by the present invention, as shown below. Figure 4 As shown, the first row is the sampling pulse signal, which is active high and data acquisition begins during the high-level period. The third row is the cosine signal, which is the laser interference signal. It is converted into a sampling clock signal, i.e., a cosine variation signal. The controller converts the peak value to a high level and the valley value to a low level, which is used as the sampling clock to sample the interference signal of the sample.

[0074] like Figure 4 The middle part shows the interference signal of the sample. Since the reflected or emitted light of the sample is generally a broadband light signal, its interference signal has the characteristic of being maximum at zero optical path and attenuating at both ends. The servo motor collects data once every one revolution.

[0075] In one possible implementation, the control unit is specifically used to process the interference signal to obtain spectral information on the light to be detected. The processing methods include, but are not limited to, filtering, apodization, phase correction, and Fourier transform.

[0076] In the embodiments of the present invention, since the spatial position between sampling points is measured in units of laser wavelength, the spatial position is uniform, and the Fast Fourier Transform (FFT) can be used directly, resulting in a faster calculation speed.

[0077] By employing the aforementioned Fourier spectrometer, the present invention can achieve at least one of the following beneficial effects:

[0078] 1. By introducing a second detection unit and a delay unit with a rotating structure, the spectrometer can more flexibly control the sampling process, improving sampling accuracy and efficiency. Precise control of the optical path difference enhances the resolution of the spectral data, facilitating more accurate analysis of the spectral characteristics of the sampled light.

[0079] 2. Compared with traditional pendulum-broom and push-broom 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 scenarios. Since the sampling position is measured in units of laser wavelength, it can directly use Fourier transform in the frequency domain with equal intervals, resulting in faster calculation speed.

[0080] 3. Since the enable signal (i.e., the sampling pulse signal) controls the start and end of acquisition, only interference signals with useful information are acquired, and there is no need to truncate the acquired signal data, which improves processing efficiency.

[0081] The control method of the Fourier spectrometer provided by the present invention is described below. The control method of the Fourier spectrometer described below can be referred to in correspondence with the specific application of the Fourier spectrometer described above.

[0082] The present invention also provides a control method for a Fourier spectrometer, applicable to any of the Fourier spectrometers described above, comprising:

[0083] Processing interference signals;

[0084] The laser interference signal collected by the second detection unit is used to generate a sampling clock signal; the electrical signal collected by the delay unit is used to generate a sampling pulse signal.

[0085] The sampling frequency of the first detection unit for interference signal sampling is controlled according to the sampling clock signal; and the sampling pulse signal is used to control the first detection unit to turn interference signal sampling on or off.

[0086] In one possible implementation, controlling the first detection unit to turn on or off interference signal sampling based on the sampling pulse signal includes:

[0087] When the first photodetector generates an electrical signal, it generates a sampling pulse signal to begin sampling and outputting the interference signal to the control unit; when the second photodetector generates an electrical signal, it generates a sampling pulse signal to stop sampling and outputting the interference signal to the control unit.

[0088] In one possible implementation, the laser interference signal is a cosine signal; the sampling frequency of the interference signal sampling by the first detection unit is controlled according to the sampling clock signal, including:

[0089] A sampling clock is generated based on the peak, valley, or zero-crossing position of the cosine signal to control the sampling frequency of the first detection unit for sampling the interference signal.

[0090] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5As shown, the electronic device may include a processor 510, a communications interface 520, a memory 530, and a communications bus 540. The processor 510, communications interface 520, and memory 530 communicate with each other via the communications bus 540. The processor 510 can call logic instructions in the memory 530 to execute a control method for the Fourier spectrometer. This method includes: processing interference signals; acquiring laser interference signals collected by a second detection unit to generate a sampling clock signal; acquiring electrical signals collected by a delay unit to generate sampling pulse signals; controlling the sampling frequency of the first detection unit for interference signal sampling according to the sampling clock signal; and controlling the first detection unit to turn interference signal sampling on or off according to the sampling pulse signal.

[0091] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0092] On the other hand, the present invention also provides a computer program product, which includes a computer program that 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. The method 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 to sample 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.

[0093] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements a control method for a Fourier spectrometer provided by the methods described above. The method includes: processing an interference signal; acquiring a laser interference signal collected by a second detection unit to generate a sampling clock signal; acquiring an electrical signal collected by a delay unit to generate a sampling pulse signal; controlling the sampling frequency of the first detection unit for interference signal sampling according to the sampling clock signal; and controlling the first detection unit to turn interference signal sampling on or off according to the sampling pulse signal.

[0094] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0095] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A Fourier spectrometer, characterized by, 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 configured to input the light to be detected into the interference unit; The interference unit is configured to divide the light to be detected into a first light and a second light, 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 configured to output the interference signal of the first light and the second light to the control unit; The delay unit is configured to change the optical path of the second light so that the first light and the second light generate an interference signal, and also configured to generate an electrical signal output to the control unit; The second detection unit is configured 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 configured to process the interference signal, generate a sampling clock signal according to the laser interference signal to control the sampling frequency of the first detection unit for interference signal sampling; Generate a sampling pulse signal according to the electrical signal to control the first detection unit to open or close the interference signal sampling; The delay unit with a rotating structure comprises a turntable with a servo motor, the turntable has a first mirror and a second mirror arranged in parallel thereon, and a third mirror is further arranged outside the turntable, and the third mirror has a first photodetector and a second photodetector mounted at two ends thereof; The first mirror is configured to receive the second light emitted by the interference unit and reflect it to the second mirror; The third mirror is configured to receive the light emitted by the second mirror and reflect it to the interference unit; The first photodetector and the second photodetector are configured to convert the laser received at the edge of the third mirror into the electrical signal and output it to the control unit to generate a sampling pulse signal; The control unit is specifically configured to start sampling the interference signal of the first light and the second light and output it to the control unit when the first photodetector generates the 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 the electrical signal; The servo motor is configured to control the rotation of the turntable according to the control instruction of the control unit.

2. The Fourier spectrometer of claim 1, wherein The laser interference signal is a cosine signal; The control unit is specifically configured to generate a sampling clock according to the peak or valley or zero-crossing position of the cosine signal to control the sampling frequency of the first detection unit for interference signal sampling.

3. The Fourier spectrometer of claim 1, wherein, Any one of the first mirror, the second mirror and the third mirror can be any one of a plane mirror, a corner cube prism, a ridge prism and a involute mirror.

4. The Fourier spectrometer of claim 1, wherein, The control unit is specifically configured to obtain the spectral information on the light to be detected by processing the interference signal, and the processing mode includes but is not limited to filtering, apodization, phase correction and Fourier transform.

5. The Fourier spectrometer of claim 1, wherein, The sampling pulse signal is a TTL signal.

6. A method of controlling a Fourier spectrometer, characterized by, The Fourier spectrometer is applied to any one of claims 1-5, comprising: processing the interference signal; acquiring the laser interference signal collected by the second detection unit to generate a sampling clock signal; and acquiring the electrical signal collected by the delay unit to generate a sampling pulse signal; controlling the sampling frequency of the interference signal sampling of the first detection unit according to the sampling clock signal; and controlling the first detection unit to start or stop the interference signal sampling according to the sampling pulse signal.

7. The control method of a Fourier spectrometer according to claim 6, characterized in that, controlling the first detection unit to start or stop the interference signal sampling according to the sampling pulse signal, comprising: when the first photodetector generates an electrical signal, generating the sampling pulse signal to start outputting the interference signal sampling to the control unit; when the second photodetector generates an electrical signal, generating the sampling pulse signal to stop outputting the interference signal sampling to the control unit.

8. The control method of a Fourier spectrometer according to claim 6, characterized in that, The laser interference signal is a cosine signal; and controlling the sampling frequency of the interference signal sampling of the first detection unit according to the sampling clock signal, comprising: generating the sampling clock signal according to the peak value, the valley value or the zero value of the cosine signal to control the sampling frequency of the interference signal sampling of the first detection unit.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the control method of the Fourier spectrometer according to any one of claims 6-8.

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