CN115389445B - Control method and system of Fourier infrared interferometer and readable storage medium - Google Patents

Control method and system of Fourier infrared interferometer and readable storage medium Download PDF

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CN115389445B
CN115389445B CN202211322241.9A CN202211322241A CN115389445B CN 115389445 B CN115389445 B CN 115389445B CN 202211322241 A CN202211322241 A CN 202211322241A CN 115389445 B CN115389445 B CN 115389445B
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period
preset
target period
electromagnetic coil
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CN115389445A (en
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于志伟
张涵
张建清
陈晨
屈颖
周城
唐怀武
于俊库
章成钢
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Hangzhou Zetian Chunlai Technology Co ltd
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Abstract

The invention relates to a control method, a system and a readable storage medium of a Fourier infrared interferometer, wherein the control method comprises the following steps: collecting current signals of an electromagnetic coil, and calculating to obtain the current swing distance of the rocker arm; judging whether the current swing distance of the rocker arm is within a preset swing distance interval or not; if not, judging whether the current swing distance of the rocker arm is smaller than the minimum value of the preset swing distance interval or not; if yes, adjusting the peak value of the large current signal; if not, adjusting the peak-to-peak value of the current signal; selecting a signal point with highest signal intensity in the interference image in the target period as a zero optical path difference point, and judging whether the zero optical path difference point is in the middle area of the interference image in the target period; if not, switching to judging whether the zero optical path difference point is earlier than the middle area of the interference pattern in the target period, and adjusting the current average value of the current signal according to different judgment results. The invention has high control precision on the swing of the rocker arm.

Description

Control method and system of Fourier infrared interferometer and readable storage medium
Technical Field
The invention belongs to the technical field of intelligent control of Fourier infrared interferometers, and particularly relates to a control method and a control system of a Fourier infrared interferometer and a readable storage medium.
Background
The Fourier infrared spectrum technology has become one of the main means of infrared spectrum analysis, because the trace gas in the atmosphere is mostly infrared active gas, and has the characteristic of absorbing and emitting infrared characteristic spectrum in the waveband range of 2-30 μm, and the waveband range belongs to the fingerprint waveband of the middle infrared region, which is very beneficial to the spectrum measurement. The Fourier infrared spectrum technology combines a Michelson interferometer, a modulation technology and a computer technology by utilizing a split beam interference principle, realizes the reduction from an interference pattern to a spectrum by a Fourier transform method, and inverts the concentration of the gas to be detected according to the obtained spectrum. Therefore, the Fourier infrared spectrum technology is widely applied to air pollutant monitoring.
The Fourier infrared interferometer is a core component of the Fourier infrared spectrum technology, the rocker arm swings back and forth always according to a certain frequency in the operation process of the interferometer, and the accurate control of the swinging of the rocker arm is a key point for generating high-precision spectrums.
Disclosure of Invention
Based on the above-mentioned drawbacks and deficiencies of the prior art, it is an object of the present invention to provide a method, a system and a readable storage medium for controlling a fourier infrared interferometer.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the control method of the Fourier infrared interferometer comprises a rocker arm and a movable mirror arranged on the rocker arm, wherein the rocker arm is driven by adopting the combination of an electromagnetic coil and a magnet, and a periodic current signal is applied to the electromagnetic coil to drive the rocker arm and the movable mirror to reciprocate, and the control method comprises the following steps:
s1, collecting current signals of an electromagnetic coil, taking the adjacent peak-valley of the current signals as a target period, and calculating the current swing distance of the rocker arm according to the number of signal points of an interference pattern in the target period;
s2, judging whether the current swing distance of the rocker arm is within a preset swing distance interval or not; if not, go to step S3;
s3, judging whether the current swing distance of the rocker arm is smaller than the minimum value of a preset swing distance interval or not; if so, adjusting the peak-to-peak value of the large current signal according to a first preset change amount; if not, adjusting the peak-to-peak value of the current signal according to a second preset change amount;
s4, selecting a signal point with the highest signal intensity in the interference image in the target period as a zero optical path difference point, and judging whether the zero optical path difference point is in the middle area of the interference image in the target period; if not, go to step S5;
s5, judging whether the zero optical path difference point is earlier than the middle area of the interference pattern in the target period; if so, adjusting the current average value of the current signal according to a third preset change amount; if not, the current average value of the current signal is adjusted according to the fourth preset change amount.
Preferably, in the step S1, the current swing distance of the rocker armSComprises the following steps:
Figure 452487DEST_PATH_IMAGE001
wherein,nthe number of signal points of the interferogram within the target period,λthe wavelength of the laser of the fourier infrared interferometer.
Preferably, in the step S3, the first preset change amount is:
Figure 17460DEST_PATH_IMAGE002
wherein,S 1 is the minimum value of the preset swing distance interval,min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
Preferably, in step S3, the second preset change amount is:
Figure 463485DEST_PATH_IMAGE003
wherein,S 2 is the maximum value of the preset swing distance interval,min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis an electromagnetic coil and a rocker armIs measured by the distance between the rotation fulcrums.
Preferably, the four magnets are located on two sides of the electromagnetic coil and opposite to each other, the adjacent magnets located on the same side have opposite polarities, and the opposite magnets located on different sides have the same polarity.
Preferably, in step S5, adjusting the current average value of the current signal according to a third preset change amount includes:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the large current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the large current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
the second preset polarity combination state is opposite to the first preset polarity combination state;
in the step S5, adjusting the current average value of the current signal according to a fourth preset variation includes:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal to be small according to a fourth preset change amount; and if the target period is the current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount.
As a preferable scheme, the third preset change amount is:
Figure 303572DEST_PATH_IMAGE004
wherein,n 0 is the position of the optical path difference point with zero,
Figure 911271DEST_PATH_IMAGE005
，min order to be the weight of the rocker arm,Bthe magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dthe middle area of the interference pattern in the target period is ^ greater or greater as the distance between the solenoid and the pivot point of the rocker arm>
Figure 963541DEST_PATH_IMAGE006
，
Figure 947677DEST_PATH_IMAGE007
Is a position deviation threshold.
Preferably, the fourth preset change amount is:
Figure 401792DEST_PATH_IMAGE008
wherein,n 0 is the position of the optical path difference point with zero,
Figure 695239DEST_PATH_IMAGE005
，min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dthe middle area of the interference pattern in the target period is ^ greater or greater as the distance between the solenoid and the pivot point of the rocker arm>
Figure 969226DEST_PATH_IMAGE006
，
Figure 757053DEST_PATH_IMAGE007
Is a position deviation threshold.
The invention also provides a control system of the Fourier infrared interferometer, which applies the control method according to any one of the above schemes, and the control system comprises:
the acquisition module is used for acquiring current signals of the electromagnetic coil;
the calculating module is used for calculating the current swinging distance of the rocker arm according to the number of signal points of the interference pattern in a target period by taking the adjacent peak-valley of the current signal as the target period;
the judging module is used for judging whether the current swinging distance of the rocker arm is within a preset swinging distance interval or not and judging whether the current swinging distance of the rocker arm is smaller than the minimum value of the preset swinging distance interval or not;
the selection module is used for selecting a signal point with the highest signal intensity in the interference pattern in the target period as a zero optical path difference point; correspondingly, the judging module is further configured to judge whether the zero optical path difference point is in the middle region of the interferogram in the target period, and further determine whether the zero optical path difference point occurs earlier than the middle region of the interferogram in the target period;
and the execution module is used for executing corresponding operation according to the judgment result of the judgment module.
The invention also provides a readable storage medium, wherein the readable storage medium stores instructions which, when executed on a computer, cause the computer to execute the control method according to any one of the above aspects.
Compared with the prior art, the invention has the beneficial effects that:
according to the control method and system for the Fourier infrared interferometer and the readable storage medium, the interferogram is analyzed, and the peak value and the average value of the current signal are adjusted based on the analysis result of the interferogram, so that the swinging position and distance of the rocker arm are accurately controlled to meet the requirements, and the control precision reaches the micron level.
Drawings
FIG. 1 is a block diagram of a Fourier infrared interferometer of an embodiment of the present invention;
FIG. 2 is a graph of a synchronized coil current signal, a laser signal and its local amplification, an infrared light signal and its local amplification of an embodiment of the present invention;
FIG. 3 is a flow chart of a method of controlling a Fourier infrared interferometer of an embodiment of the present invention;
FIG. 4 is a schematic view of a magnet and coil mounting of an example of the application of the present invention;
FIG. 5 is a block diagram of a control system of the Fourier infrared interferometer of the embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
As shown in fig. 1, the fourier infrared interferometer according to the embodiment of the present invention is an existing fourier infrared interferometer, and mainly includes an infrared light source 1, a laser 2, a reflecting mirror 3, a spectroscope 4, an angle mirror 5, a rocker arm 6, a magnet 7, an electromagnetic coil 8, an infrared detector 9, a laser detector 10, and a processor 11. The angle mirror (namely, the movable mirror) is arranged on the rocker arm, the rocker arm is driven by adopting the combination of the electromagnetic coil and the magnet, and the periodic current signal is applied to the electromagnetic coil, so that the rocker arm and the movable mirror can be driven to reciprocate; the specific structure of the above components can refer to the prior art, and details are not described herein.
The four magnets are respectively arranged on two sides of the electromagnetic coil in a pairwise manner and are opposite to each other, the adjacent magnets on the same side are opposite in polarity, and the opposite magnets on different sides are identical in polarity. When current passes through the electromagnetic coil, magnetic force is generated to drive the rocker arm to swing to one side; when the current is reversed, the magnetic force polarity is reversed, and the rocker arm swings to the other side. The reciprocating motion of the rocker arm can be realized by applying periodic current to the electromagnetic coil.
The working principle of the Fourier infrared interferometer provided by the embodiment of the invention is as follows:
infrared light beams emitted by the infrared light source pass through the spectroscope to form two beams of infrared light, and the two beams of infrared light respectively reach the two corner mirrors and are reflected to the spectroscope; after passing through the spectroscope again, the two beams of light are combined to form interference light; wherein, half of the interference light is emitted to the light source, and the other half of the interference light is emitted to the infrared detector; the infrared detector collects the signal of the interference light, and when the rocker arm swings ceaselessly, the optical path difference of the two beams of infrared light changes continuously, so that the intensity of the formed interference light changes continuously. The other path of laser emits laser with single wavelength, and forms two beams of laser through the spectroscope, and the two beams of laser respectively reach the two corner mirrors and are reflected back to the spectroscope; after passing through the spectroscope again, the two beams of light are combined to form interference light; wherein, half of the interference light is emitted to the laser, and the other half of the interference light is emitted to the laser detector; the laser detector collects the signal of the interference light, when the rocker arm swings ceaselessly, the optical path difference of the two beams of laser light changes ceaselessly, so that the intensity of the formed interference light changes ceaselessly and the formed interference light is in a sine wave shape.
Wherein the laser wavelength isλ(in μm) representing the swing distance of the rocker arm for each laser signal periodλ. As shown in fig. 2, the coil current of the electromagnetic coil, the laser signal collected by the laser detector and the infrared light signal collected by the infrared detector are synchronously collected, the infrared light signal with the synchronous high point of the laser signal is selected as the signal point, the signal points are arranged in sequence to obtain the interference pattern, and the distance between adjacent signal points in the interference pattern isλ(ii) a The spectrum can be obtained by performing fourier transform on the interferogram, which is specifically referred to in the prior art and will not be described herein. Wherein the peak value of the coil current isI F A wave trough value ofI G Average value of current ofb. In order to accurately control the swinging position and distance, the interference pattern is analyzed, and the current of the electromagnetic coil is automatically adjusted according to the analysis result, so that the swinging position and distance of the rocker arm meet the requirements.
As shown in fig. 3, the method for controlling a fourier infrared interferometer according to an embodiment of the present invention includes the following steps:
s1, collecting current signals of an electromagnetic coil, taking the adjacent peak valley of the current signals as a target period, and calculating the current swing distance of the rocker arm according to the number of signal points of an interference pattern in the target period.
Specifically, the current signal of the electromagnetic coil is taken as a period determination basis, a target period is set between adjacent peaks and troughs of the current signal, namely, a period interruption point is set between adjacent peaks and troughs of the current signal, and the target period is intercepted.
Wherein, the current swing distance of the rocker arm is calculated according to the number of signal points of the interference pattern in the target periodSComprises the following steps:
Figure 65675DEST_PATH_IMAGE001
wherein,nthe number of signal points of the interferogram within the target period,λthe wavelength of the laser of the fourier infrared interferometer. The interference pattern is from 1 tonA set of sequentially arranged signal points.
S2, judging whether the current swing distance of the rocker arm is within a preset swing distance interval or not; if not, go to step S3.
In particular, the swing distance of the rocker arm should correspond to the swing distance required for the preset resolution of the interferometer, i.e. in the preset swing distance intervalS 1 ，S 2 ]And (4) the requirements are met.
When the above determination result is negative, there are two cases: first one isS＜S 1 The second kind isS＞S 2 Therefore, the next step is performed.
S3, judging whether the current swing distance of the rocker arm is smaller than the minimum value of a preset swing distance interval or not; if so, adjusting the peak-to-peak value of the large current signal according to a first preset change amount; if not, the peak-to-peak value of the current signal is adjusted to be small according to the second preset change quantity. The peak-to-peak value of the current signal is the difference value between the highest value and the lowest value of the signal.
If it isS＜S 1 The peak-to-peak value of the current signal should be adjusted. Specifically, the peak-to-peak value of the current signal is adjusted according to a first preset change amount; for the peak value of the current signal, the peak value is determined by the primary wave peak valueI F Is adjusted to
Figure 280755DEST_PATH_IMAGE009
(ii) a For the trough value of the current signal, the original trough value is usedI G Adjusted to be->
Figure 556885DEST_PATH_IMAGE010
The average value of the current->
Figure 882824DEST_PATH_IMAGE011
Is kept constant while the peak-to-peak value of the current signal is controlled by
Figure 311531DEST_PATH_IMAGE012
Adjusted to be->
Figure 431934DEST_PATH_IMAGE013
。
Wherein the first preset variation is:
Figure 946092DEST_PATH_IMAGE002
wherein,S 1 is the minimum value of the preset swing distance interval,min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
If it isS＞S 2 The peak-to-peak value of the current signal should be adjusted down. Specifically, the peak-to-peak value of the current signal is adjusted to be small according to a second preset change amount; for the peak value of the current signal, the peak value is determined by the primary wave peak valueI F Is adjusted to
Figure 59410DEST_PATH_IMAGE014
(ii) a For the trough value of the current signal, the original trough value is usedI G Adjusted to be->
Figure 608203DEST_PATH_IMAGE015
The average value of the current->
Figure 899507DEST_PATH_IMAGE011
Is kept constant while the peak-to-peak value of the current signal is controlled by
Figure 900961DEST_PATH_IMAGE012
Adjusted to be->
Figure 568703DEST_PATH_IMAGE016
。
Wherein the second preset variation is:
Figure 958621DEST_PATH_IMAGE003
wherein,S 2 is the maximum value of the preset swing distance interval,min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
Therefore, the relationship between the peak-to-peak variation amount and the swing distance variation amount of the current signal is related to parameters such as the number of turns of the coil, the weight of the rocker arm, the magnetic force of the magnet acting on the electromagnetic coil, and the distance between the electromagnetic coil and the pivot of the rocker arm.
In practical applications, the relationship between the parameters can be determined by manually adjusting the peak value and then measuring the swing distance of the rocker arm. For example: the number of turns of the coil is 100, the weight of the rocker arm is 100g, the magnet is a neodymium iron boron strong magnet, the current peak value is adjusted to be 0.1mA, and the swing distance of the rocker arm changes by 10 micrometers;
if it isS＜S 1 Then, then
Figure 686405DEST_PATH_IMAGE017
；
If it isS＞S 2 Then, then
Figure 909576DEST_PATH_IMAGE018
。
S4, selecting a signal point with the highest signal intensity in the interference image in the target period as a zero optical path difference point, and judging whether the zero optical path difference point is in the middle area of the interference image in the target period; if not, go to step S5.
Wherein the position of the zero optical path difference pointn 0 Should be located near the middle of the interferogram to be satisfactory. Specifically, the middle region of the interferogram within the target period is
Figure 646588DEST_PATH_IMAGE019
，
Figure 638815DEST_PATH_IMAGE007
Is a position deviation threshold.
When the above determination result is negative, there are two cases: the first one is
Figure 537501DEST_PATH_IMAGE020
The second kind is
Figure 497235DEST_PATH_IMAGE021
Therefore, the next step of judgment is performed.
S5, judging whether the zero optical path difference point is earlier than the middle area of the interference pattern in the target period; if so, adjusting the current average value of the current signal according to a third preset change amount; if not, the current average value of the current signal is adjusted according to the fourth preset change amount.
Wherein, adjust the current average value of the current signal according to the third preset change, including:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the large current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
the second predetermined polarity combination state is opposite to the first predetermined polarity combination state, that is, the polarity of each magnet is reversed to be converted from the first predetermined polarity combination state to the second predetermined polarity combination state.
Adjusting the current average value of the current signal according to a fourth preset change amount, comprising:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the large current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a fourth preset change amount; and if the target period is the current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount.
For easy understanding, as shown in FIG. 4, the magnets are in a first predetermined polarity combination state, and the current of the electromagnetic coilIFor clockwise direction, the target period is the current rising period, and so on, which is not described herein.
If it is
Figure 506780DEST_PATH_IMAGE020
The current average value of the current signal should be adjusted. Specifically, the current average value of the current signal is adjusted according to a third preset change amount, namely the current average value of the current signal is adjusted from the original current average valuebAdjusted to be->
Figure 619092DEST_PATH_IMAGE022
. Wherein the third preset variation is:
Figure 688679DEST_PATH_IMAGE004
wherein,n 0 the position of the optical path difference point is zero,
Figure 870131DEST_PATH_IMAGE005
，min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
If it is
Figure 948945DEST_PATH_IMAGE021
The current average of the current signal should be adjusted down. Specifically, the current average value of the current signal is adjusted to be smaller according to the fourth preset change amount, namely the current average value of the current signal is adjusted to be equal to the original current average valuebAdjusted to be->
Figure 650185DEST_PATH_IMAGE023
. Wherein the fourth preset variation is:
Figure 156253DEST_PATH_IMAGE008
wherein,n 0 is the position of the optical path difference point with zero,
Figure 575733DEST_PATH_IMAGE005
，min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
In practical applications, the relationship between these two parameters can be determined by manually adjusting the average value of the current and then observing the swing position of the rocker arm. For example, the number of turns of the coil is 100, the mass of the rocker is 100g, the magnet is a neodymium iron boron strong magnet, when the distance from the coil to the rotating shaft of the rocker is 3cm, the average current value is adjusted to be 0.1mA, and the swinging position of the rocker changes by 10 μm, namelyn 0 By varying 10/lambda, it is generally preferred to use a laser with a wavelength of 1.6 μm when applying, i.e.n 0 The change was 6.25.
If it is
Figure 176347DEST_PATH_IMAGE020
Then->
Figure 263252DEST_PATH_IMAGE024
；
If it is
Figure 674642DEST_PATH_IMAGE021
Then->
Figure 846997DEST_PATH_IMAGE025
。
In addition, step S2 and step S4 in the embodiment of the present invention may be executed synchronously or asynchronously; asynchronous execution does not require a separate order of execution.
Based on the control method of the fourier infrared interferometer according to the embodiment of the present invention, as shown in fig. 5, a control system of the fourier infrared interferometer further provided in the embodiment of the present invention includes an acquisition module, a calculation module, a determination module, a selection module, and an execution module.
Specifically, the collecting module of the present embodiment is used for collecting a current signal of the electromagnetic coil.
The calculating module of the embodiment is used for calculating the current swing distance of the rocker arm according to the number of signal points of the interference pattern in a target period by taking the adjacent peak-valley of the current signal as the target period.
Specifically, the current signal of the electromagnetic coil is taken as a period determination basis, a target period is set between adjacent peaks and troughs of the current signal, namely, a period interruption point is set between adjacent peaks and troughs of the current signal, and the target period is intercepted.
Wherein, the current swing distance of the rocker arm is calculated according to the number of signal points of the interference pattern in the target periodSComprises the following steps:
Figure 2035DEST_PATH_IMAGE001
wherein,nthe number of signal points of the interferogram within the target period,λthe wavelength of the laser of the fourier infrared interferometer. The interference pattern is from 1 tonA set of sequentially arranged signal points.
The judging module of the embodiment is used for judging whether the current swing distance of the rocker arm is within a preset swing distance interval. In particular, the swing distance of the rocker arm should correspond to the swing distance required for the preset resolution of the interferometer, i.e. in the preset swing distance intervalS 1 ，S 2 ]And (4) the requirements are met.
When the above determination result is negative, there are two cases: first one isS＜S 1 The second kind isS＞S 2 Therefore, the next step is performed.
The judging module of the embodiment is further configured to judge whether the current swing distance of the rocker arm is smaller than the minimum value of the preset swing distance interval; if so, adjusting the peak-to-peak value of the large current signal according to a first preset change amount; if not, the peak-to-peak value of the current signal is adjusted to be small according to the second preset change quantity.
If it isS＜S 1 The peak-to-peak value of the current signal should be adjusted. Specifically, the peak-to-peak value of the current signal is adjusted according to a first preset change amount; for the peak value of the current signal, the peak value is determined by the primary wave peak valueI F Is adjusted to
Figure 943446DEST_PATH_IMAGE009
(ii) a For the trough value of the current signal, the original trough value is usedI G Adjusted to be->
Figure 777934DEST_PATH_IMAGE010
The average value of the current->
Figure 172007DEST_PATH_IMAGE011
Is kept constant while the peak-to-peak value of the current signal is controlled by
Figure 130735DEST_PATH_IMAGE012
Adjusted to be->
Figure 926653DEST_PATH_IMAGE013
。
Wherein the first preset variation is:
Figure 679845DEST_PATH_IMAGE002
wherein,S 1 is the minimum value of the preset swing distance interval,mis the weight of the rocker arm and is,Bthe magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
If it isS＞S 2 The peak-to-peak value of the current signal should be adjusted down. Specifically, the peak-to-peak value of the current signal is adjusted to be small according to a second preset change amount; for the peak value of the current signal, the peak value is determined by the primary wave peak valueI F Is adjusted to
Figure 810481DEST_PATH_IMAGE014
(ii) a For the trough value of the current signal, the original trough value is usedI G Adjusted to be->
Figure 572901DEST_PATH_IMAGE015
The average value of the current->
Figure 223325DEST_PATH_IMAGE011
Is kept constant while the peak-to-peak value of the current signal is controlled by
Figure 412998DEST_PATH_IMAGE012
Adjusted to be->
Figure 516083DEST_PATH_IMAGE016
。
Wherein the second preset variation is:
Figure 800303DEST_PATH_IMAGE003
wherein,S 2 is the maximum value of the preset swing distance interval,min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
Therefore, the relationship between the peak-to-peak variation of the current signal and the swing distance variation is related to parameters such as the number of turns of the coil, the weight of the rocker arm, the magnetic force of the magnet acting on the electromagnetic coil, and the distance between the electromagnetic coil and the pivot of the rocker arm.
In practical applications, the relationship between the parameters can be determined by manually adjusting the peak value and then measuring the swing distance of the rocker arm. For example: the number of turns of the coil is 100, the weight of the rocker arm is 100g, the magnet is a neodymium iron boron strong magnet, the current peak value is adjusted to be 0.1mA, and the swing distance of the rocker arm changes by 10 micrometers;
if it isS＜S 1 Then, then
Figure 836392DEST_PATH_IMAGE017
；
If it isS＞S 2 Then, then
Figure 931387DEST_PATH_IMAGE018
。/>
The selection module of this embodiment is used to select a signal point with the highest signal intensity in the interferogram in the target period as a zero optical path difference point.
The determining module of this embodiment is further configured to determine whether the zero optical path difference point is in a middle area of the interferogram in the target period. Wherein the position of the zero optical path difference pointn 0 Should be located near the middle of the interferogram (i.e., the middle region) to meet the requirements.
Specifically, the middle region of the interferogram within the target period is
Figure 787348DEST_PATH_IMAGE019
，
Figure 625991DEST_PATH_IMAGE007
Is a position deviation threshold.
When the above determination result is negative, there are the following two cases: first one is
Figure 500275DEST_PATH_IMAGE020
The second kind is
Figure 31750DEST_PATH_IMAGE021
Therefore, the next step is performed.
The judging module of this embodiment is further configured to judge whether the zero optical path difference point occurs earlier than the middle region of the interferogram in the target period; if so, the execution module of the embodiment adjusts the current average value of the current signal according to a third preset change amount; if not, the execution module of the embodiment adjusts the current average value of the current signal according to the fourth preset change amount.
Wherein, adjust the current average value of the current signal according to the third preset change, including:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the large current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the large current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
the second predetermined polarity combination state is opposite to the first predetermined polarity combination state, that is, the polarity of each magnet is reversed to be converted from the first predetermined polarity combination state to the second predetermined polarity combination state.
Adjusting the current average value of the current signal according to a fourth preset change amount, comprising:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the large current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal to be small according to a fourth preset change amount; and if the target period is the current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount.
For ease of understanding, as shown in FIG. 4, each magnet is in a first predetermined polarity combination and the current of the electromagnetic coilIFor clockwise direction, the target period is the current rising period for example, and the details are described, and the rest is repeated in the same manner.
If it is
Figure 109428DEST_PATH_IMAGE020
The current average of the current signal should be adjusted. Specifically, the current average value of the current signal is adjusted according to a third preset change amount, namely the current average value of the current signal is adjusted from the original current average valuebAdjusted to be->
Figure 486182DEST_PATH_IMAGE022
. Wherein the third preset variation is:
Figure 231284DEST_PATH_IMAGE004
wherein,n 0 is the position of the optical path difference point with zero,
Figure 920279DEST_PATH_IMAGE005
，min order to be the weight of the rocker arm,Bis the magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
If it is
Figure 485253DEST_PATH_IMAGE021
The current average of the current signal should be adjusted down. Specifically, the current average value of the current signal is adjusted to be smaller according to the fourth preset change amount, namely the current average value of the current signal is adjusted to be equal to the original current average valuebAdjusted to be->
Figure 931278DEST_PATH_IMAGE023
. Wherein the fourth preset variation is:
Figure 265307DEST_PATH_IMAGE008
wherein,n 0 is the position of the optical path difference point with zero,
Figure 122273DEST_PATH_IMAGE005
，min order to be the weight of the rocker arm,Bthe magnetic force of the magnet acting on the electromagnetic coil,Kthe number of turns of the coil of the electromagnetic coil,dis the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
In practical applications, the relationship between these two parameters can be determined by manually adjusting the average value of the current and then observing the swing position of the rocker arm. For example, the number of turns of the coil is 100, the mass of the rocker is 100g, the magnet is a neodymium iron boron strong magnet, when the distance from the coil to the rotating shaft of the rocker is 3cm, the average current value is adjusted to be 0.1mA, and the swinging position of the rocker changes by 10 μm, namelyn 0 By varying 10/lambda, it is generally preferred to use a laser with a wavelength of 1.6 μm when applied, i.e.n 0 The change was 6.25.
If it is
Figure 440122DEST_PATH_IMAGE020
Then->
Figure 424259DEST_PATH_IMAGE024
；
If it is
Figure 878374DEST_PATH_IMAGE021
Then->
Figure 656974DEST_PATH_IMAGE025
。
The embodiment of the present invention further provides a readable storage medium, where instructions are stored in the readable storage medium, and when the instructions are executed on a computer, the instructions cause the computer to execute the control method described in the embodiment of the present invention. The readable storage medium can be burned on the current control chip to realize intelligent control of the motion of the movable mirror.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.

Claims (8)

1. The control method of the Fourier infrared interferometer comprises a rocker arm and a movable mirror arranged on the rocker arm, wherein the rocker arm is driven by adopting the combination of an electromagnetic coil and a magnet, and a periodic current signal is applied to the electromagnetic coil to drive the rocker arm and the movable mirror to reciprocate, and the control method is characterized by comprising the following steps of:
s1, collecting current signals of an electromagnetic coil, taking the adjacent peak-valley of the current signals as a target period, and calculating the current swing distance of the rocker arm according to the number of signal points of an interference pattern in the target period;
s2, judging whether the current swing distance of the rocker arm is within a preset swing distance interval or not; if not, turning to the step S3;
s3, judging whether the current swing distance of the rocker arm is smaller than the minimum value of a preset swing distance interval or not; if so, adjusting the peak-to-peak value of the large current signal according to the first preset variation; if not, adjusting the peak-to-peak value of the current signal according to a second preset change amount;
s4, selecting a signal point with the highest signal intensity in the interference image in the target period as a zero optical path difference point, and judging whether the zero optical path difference point is in the middle area of the interference image in the target period; if not, go to step S5;
s5, judging whether the zero optical path difference point is earlier than the middle area of the interference pattern in the target period; if so, adjusting the current average value of the current signal according to a third preset change amount; if not, adjusting the current average value of the current signal according to a fourth preset change amount;
the four magnets are respectively positioned on two sides of the electromagnetic coil in pairs and are opposite to each other, the adjacent magnets positioned on the same side have opposite polarities, and the opposite magnets positioned on different sides have the same polarity;
in the step S5, adjusting the current average value of the current signal according to the third preset variation includes:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the large current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal to be small according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a third preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a third preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a third preset change amount;
the second preset polarity combination state is opposite to the first preset polarity combination state;
in the step S5, adjusting the current average value of the current signal according to a fourth preset variation includes:
if the magnets are in a first preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is the current rising period, the current average value of the current signal is adjusted to be small according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount;
if each magnet is in a first preset polarity combination state and the current of the electromagnetic coil is in a counterclockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in a clockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal according to a fourth preset change amount; if the target period is a current reduction period, adjusting the current average value of the current signal to be small according to a fourth preset change amount;
if the magnets are in a second preset polarity combination state and the current of the electromagnetic coil is in the anticlockwise direction, judging that the target period is a current rising period or a current falling period; if the target period is a current rising period, adjusting the current average value of the current signal to be small according to a fourth preset change amount; and if the target period is the current reduction period, adjusting the current average value of the current signal according to a fourth preset change amount.
2. The method for controlling a fourier infrared interferometer according to claim 1, wherein in the step S1, a current swing distance S of the rocker arm is:
S＝n*λ
wherein n is the number of signal points of the interferogram within the target period, and λ is the wavelength of the laser of the fourier infrared interferometer.
3. The method for controlling a fourier infrared interferometer according to claim 2, wherein in the step S3, the first preset change amount is:
Figure FDA0003988365540000031
wherein S is 1 The minimum value of the preset swing distance interval is obtained, m is the weight of the rocker arm, B is the magnetic force of the magnet acting on the electromagnetic coil, K is the number of turns of the electromagnetic coil, and d is the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
4. The method for controlling a fourier infrared interferometer according to claim 2, wherein in the step S3, the second preset change amount is:
Figure FDA0003988365540000032
wherein S is 2 The maximum value of the preset swing distance interval is defined, m is the weight of the rocker arm, B is the magnetic force of the magnet acting on the electromagnetic coil, K is the number of turns of the coil of the electromagnetic coil, and d is the distance between the electromagnetic coil and the rotating fulcrum of the rocker arm.
5. The method of claim 1, wherein the third predetermined change amount is:
Figure FDA0003988365540000033
wherein n is 0 At the position of the zero optical path difference point, n 0 ∈[1，n]M is the weight of the rocker arm, B is the magnetic force of the magnet acting on the electromagnetic coil, K is the number of turns of the electromagnetic coil, d is the distance between the electromagnetic coil and the rotation fulcrum of the rocker arm, and the middle area of the interference pattern in the target period is
Figure FDA0003988365540000041
Δ n is a position deviation threshold.
6. The method of controlling a fourier infrared interferometer according to claim 1, wherein the fourth preset change amount is:
Figure FDA0003988365540000042
wherein n is 0 At the position of the zero optical path difference point, n 0 ∈[1，n]M is the weight of the rocker arm, B is the magnetic force of the magnet acting on the electromagnetic coil, K is the number of turns of the electromagnetic coil, d is the distance between the electromagnetic coil and the rotation fulcrum of the rocker arm, and the middle area of the interference pattern in the target period is
Figure FDA0003988365540000043
Δ n is a position deviation threshold.
7. Control system for a fourier infrared interferometer, applying the control method according to any of claims 1-6, characterized in that it comprises:
the acquisition module is used for acquiring current signals of the electromagnetic coil;
the calculating module is used for calculating the current swinging distance of the rocker arm according to the number of signal points of the interference pattern in a target period by taking the adjacent peak-valley of the current signal as the target period;
the judging module is used for judging whether the current swinging distance of the rocker arm is within a preset swinging distance interval or not and judging whether the current swinging distance of the rocker arm is smaller than the minimum value of the preset swinging distance interval or not;
the selection module is used for selecting a signal point with the highest signal intensity in the interference pattern in the target period as a zero optical path difference point; correspondingly, the judging module is further configured to judge whether the zero optical path difference point is in a middle area of the interferogram in the target period, and further determine whether the zero optical path difference point appears earlier than the middle area of the interferogram in the target period;
and the execution module is used for executing corresponding operation according to the judgment result of the judgment module.
8. A readable storage medium having instructions stored therein, which when run on a computer, cause the computer to perform the control method of any one of claims 1-6.
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