CN111493831B - Adaptive calibration system based on OCT light interference and working method - Google Patents
Adaptive calibration system based on OCT light interference and working method Download PDFInfo
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Abstract
An adaptive calibration system based on OCT light interference comprises an image recognition module, a main control unit, a motion control unit, a light interference device, a data processing module and a display module; the working method comprises the steps of calibration, image characteristic information identification and extraction, motor action control, image information display, movement distance judgment, calibration and accurate positioning; the system has simple structure, low cost and strong anti-interference capability; the calibration system is arranged on the reference arm, the optical path calibration only needs to be adjusted in a small range, and the self-adaptive calibration speed is high; the precision and accuracy of the optical interference signal calibration are high.
Description
The technical field is as follows:
the invention relates to the field of Optical coherence tomography research, in particular to an adaptive calibration system based on OCT (Optical coherence tomography) light interference and a working method.
(II) background art:
the optical coherence tomography technology utilizes the interference principle of light to scan and image biological tissues such as blood vessels, can quickly obtain the microstructure of the cross section of the blood vessels, has high sensitivity and high resolution (10-20 mu m), and is widely applied to the subjects of ophthalmology, dentistry, heart disease and the like.
The optical coherence tomography imaging equipment needs to be matched with a catheter for use, and interference can only occur on the premise that the optical path difference between a reference arm and a measurement sample arm of an optical interference device is within the coherence length and has a fixed polarization state because the coherence length of a light source is very short. However, in the actual imaging process, the conduits of the measurement sample arm are not completely uniform, resulting in a change in the optical path of the measurement light. Meanwhile, due to the double refraction characteristic of the single-mode optical fiber, the polarization state of the output light of the optical fiber can change along with factors such as temperature, pressure, bending and the like; moreover, the tested biological tissues have individual differences, which cause the phenomenon of polarization state mismatch between the reference light of the reference arm and the measurement light of the measurement sample arm, thereby affecting the imaging quality of the system, such as sensitivity, resolution ratio, and the like. Therefore, the optical interference calibration needs to be realized by changing the optical path length and the polarization state of the reference arm in real time during the imaging process.
The traditional method for OCT imaging light interference calibration is realized by manually adjusting and observing a screen image by naked eyes, and the imaging result has subjective difference. After the catheter is replaced, corresponding adjustment is needed again, the operation is complex and time-consuming, and finally obtained images cannot guarantee consistency. In addition, the preparation time of the operation process is long, great inconvenience is brought to doctors and patients, and unpredictable influence can be caused to the disease condition diagnosis of the patients. And the light interference calibration after the catheter is replaced needs a professional to carry out related training, so that the imaging result can be correctly identified, and the clinical application of equipment is not facilitated. Therefore, adaptive calibration of optical interference becomes especially important.
The existing optical interference calibration system places a polarization controller in a measurement sample arm, increases some unnecessary potential safety hazards and design complexity, realizes optical path calibration by adding an optical device on an optical transmission path, has a complex structure and great control difficulty, and increases the cost of the system.
(III) the invention content:
the invention aims to provide an adaptive calibration system based on OCT light interference and a working method, which can solve the defects of the prior art, can quickly adjust reference light in real time according to the change of a measuring light signal, reduce the preparation time of an operation, ensure the consistency of an imaging result, and ensure the reality, accuracy and effectiveness of the imaging result.
The technical scheme of the invention is as follows: an adaptive calibration system based on OCT light interference is characterized by comprising an image recognition module, a main control unit, a motion control unit, a light interference device, a data processing module and a display module; wherein the adaptive calibration system based on OCT light interference is mounted in a reference arm; the motion control unit is used for calibrating light interference and consists of a motion control module, a reference arm optical path adjusting module and a polarization state matching adjusting module; the input end of the motion control module receives an image calibration result of the main control unit, and the output end of the motion control module is respectively connected with the reference arm optical path adjusting module and the polarization state matching adjusting module; the input end of the image identification module is connected with the display module, and the output end of the image identification module is connected with the main control unit; the image recognition module performs characteristic recognition on the collected image and feeds back a recognition result to the main control unit; the main control unit is used for processing an image recognition result and controlling the motion control module; the optical interference device is connected with a polarization state matching adjustment module in the motion control unit and is used for generating a system interference optical signal; the input end of the data processing module is connected with the optical interference device, and the output end of the data processing module is connected with the display module and used for acquiring and processing the acquired optical interference signal; the display module is used for displaying image information and feeding the image information back to the image recognition module.
The reference arm optical path adjusting module consists of an optical path control linear motor, an optical fiber collimator, an optical path position monitor, a reflector and a guide rail with a sliding block; the reflector is provided with a connecting block; the input end of the light program control linear motor receives a motor control signal of the motion control module, and the output shaft of the light program control linear motor is a lead screw; a screw nut is arranged on the screw; the reflecting mirror is arranged on a sliding block of the guide rail and is connected with the screw nut through a connecting block; the optical path control linear motor is connected with the reflector to drive the reflector to move on the guide rail with the sliding block, so that the optical path adjustment of the reference arm is realized; the optical fiber collimator is connected with the polarizer through an optical fiber, emergent light of the optical fiber collimator is reflected through the reflector and has the function of converting the emergent light of the optical fiber into collimated light, and the collimated light can enter the optical fiber collimator after being reflected; the optical path position monitor is arranged near the moving track of the reflector along the guide rail, and the output end of the optical path position monitor is connected with the motion control module and used for feeding back the operating position of the reflector until the optimal matching optical path is found.
The guide rail with the sliding block and a lead screw of the optical path control linear motor are in parallel position relation.
The number of the optical path position monitors is at least 2.
The optical path position monitor is connected with the motion control module in a non-contact connection mode, and the optical path position monitor is a distance sensor and detects the position of an optical path by continuously sending pulses.
The polarization state matching adjustment module consists of a polarization control rotating motor, a polarizer and a polarization position monitor; the head end of the polarization control rotating motor is provided with a polarization motor gear; one end of the polarizer is provided with a polarizing gear; the polarization motor gear is meshed with the polarization gear; the polarizer is connected with the optical interference device; the polarization position monitor is arranged on one side of the polarizer; the input end of the polarization control rotating motor receives a motor control signal of the motion control module, and the output end of the polarization control rotating motor controls the deflection of the polarizer through the polarization motor gear and the polarization gear; the output end of the polarization position monitor is connected with the motion control module and used for feeding back the deflection position of the polarizer, and the deflection of the polarizer is facilitated to realize polarization state matching until the optimal polarization state is obtained.
The polarization position monitor is connected with the motion control module in a non-contact connection mode; the polarization position detector is a distance sensor which detects the moving position of the polarizer in real time by continuously sending pulse signals.
A working method of an adaptive calibration system based on OCT light interference is characterized by comprising the following steps:
(1) After the adaptive calibration system based on OCT light interference is successfully connected with a catheter, automatic calibration is firstly carried out;
(2) After the calibration is finished, the image identification module automatically identifies the image characteristic information by extracting image data and feeds the image characteristic information back to the main control unit in real time;
(3) The main control unit sends a feedback result to the control motion control unit, and the motion control module generates a motor control signal to respectively drive the light program control linear motor and the polarization control rotary motor to move;
(4) When the linear motor is controlled by the optical path to operate, the rotary motion of the screw is converted into the linear motion of a screw nut, so that the reflector is driven to move back and forth on the guide rail; the polarization control rotating motor rotates to enable the polarization motor gear to rotate, and the polarization gear meshed and connected with the polarization motor gear also rotates correspondingly, so that the polarizer is driven to swing;
(5) The optical path position monitor monitors the position of the reflector moving on the guide rail in real time and feeds back position information to the motion control module in real time; the polarization position detector monitors the swinging position of the polarizer in real time and also feeds swinging information back to the motion control module in real time;
(6) The motion control module is connected with the optical path interference module, sends the motion data to the data processing module and displays the motion data on the display module in real time;
(7) The image recognition module judges and calibrates the movement distance according to the image information displayed on the display module in real time, and accurately positions the movement distance;
(8) When the optical path of the reference light is matched with the optical path of the measuring light and has a fixed polarization state, the image calibration is successful, and the main control unit controls the motion control module to lock the position of the motor;
(9) When the external environment changes, the state of the measuring light changes, the interference effect is influenced, and at the moment, the adaptive calibration system based on the OCT light interference can perform automatic calibration again, so that the image acquired by the operation is ensured to be the optimal image effect.
The identification process of the image identification module in the step (2) for automatically identifying the image characteristic information comprises the following steps:
1) Line extraction, namely extracting n lines by using a line spacing extraction method and taking the circle center as a starting point, wherein the number n of the lines can be adjusted according to an algorithm and the number;
2) And (4) carrying out region search and vessel wall identification, and determining a vessel wall imaging position by constructing a constraint algorithm.
The control mode of the optical program control linear motor in the step (4) comprises comprehensive control and accurate control; the comprehensive control means that the optical path control linear motor reciprocates once or for multiple times within a set optical path matching range to determine a search area, wherein the optical path matching range is determined by the fact that the optical path difference between the sample arm and the reference arm is smaller than the self-coherence length of the light source and can be adjusted according to the self-coherence length of the light source; the precise control is that the motor reciprocates once or more times in the search area and gradually approaches to an ideal point, the ideal point refers to that when the motor stops at the position, the corresponding image is a precisely calibrated image, and when the motor is within the set allowable error range of the ideal point, the optical path matching is successful.
And (3) controlling the polarization in the step (4) mainly through a polarization control rotating motor and a polarization position monitor, so as to control the deflection of the polarizer to realize the matching of the polarization state, and when the polarization controller deflects to a certain position so that the image information intensity reaches the maximum value, considering the polarization position as the optimal matching point.
The invention has the advantages that: 1. the calibration system is arranged on the reference arm, the optical path calibration only needs to be adjusted in a small range, the self-adaptive calibration speed is high, and the preparation time of the operation is shortened; 2. different from the existing manual calibration and sample arm calibration modes, the reference arm self-adaptive calibration is based on the calibration distance discrimination of image recognition and the accurate movement distance positioning of movement control, so that the consistency of imaging results after different sample arms are calibrated is ensured; 3. the motion control module is connected through a precise mechanical transmission device, so that the precision and the accuracy of the calibration of the optical interference signal are ensured; 4. the system is placed in a reference arm, the optical path and the polarization are controlled in parallel, a self-adaptive calibration method is adopted in the imaging process, and the system is simple in structure, low in cost, safe, reliable and strong in anti-interference capability.
(IV) description of the drawings:
fig. 1 is a block diagram of an overall structure of an adaptive calibration system based on OCT light interference according to the present invention.
Fig. 2 is a block diagram schematically illustrating a structure of a motion control unit in an adaptive calibration system based on OCT light interference according to the present invention.
FIG. 3 is a flow chart of an OCT system without adding an optical interference adaptive calibration control mode
Fig. 4 is a schematic flow chart of a working method of an adaptive calibration system based on OCT light interference according to the present invention.
Wherein, 1-1 is an optical path control linear motor, 1-2 is a screw nut, 1-3 is a connecting block, 1-4 is an optical fiber collimator, 1-5 is an optical path position monitor, 1-6 is a reflector, 1-7 is a guide rail with a sliding block, 1-8 is a polarization control rotating motor, 1-9 is a polarization motor gear, 1-10 is a polarization position monitor, 1-11 is a polarization gear, and 1-12 is a polarizer.
(V) specific embodiment:
example (b): an adaptive calibration system based on OCT light interference is shown in figure 1 and is characterized by comprising an image recognition module, a main control unit, a motion control unit, a light interference device, a data processing module and a display module; wherein the adaptive calibration system based on OCT light interference is mounted in a reference arm; the motion control unit is used for calibrating light interference and comprises a motion control module, a reference arm optical path adjusting module and a polarization state matching adjusting module; the input end of the motion control module receives an image calibration result of the main control unit, and the output end of the motion control module is respectively connected with the reference arm optical path adjusting module and the polarization state matching adjusting module; the input end of the image identification module is connected with the display module, and the output end of the image identification module is connected with the main control unit; the image recognition module performs characteristic recognition on the collected image and feeds back a recognition result to the main control unit; the main control unit is used for processing an image recognition result and controlling the motion control module; the optical interference device is connected with a polarization state matching and adjusting module in the motion control unit and is used for generating a system interference optical signal; the input end of the data processing module is connected with the optical interference device, and the output end of the data processing module is connected with the display module and used for acquiring and processing the acquired optical interference signal; the display module is used for displaying image information and feeding the image information back to the image recognition module.
The reference arm optical path adjusting module is composed of an optical path control linear motor 1-1, an optical fiber collimator 1-4, an optical path position monitor 1-5, a reflector 1-6 and a guide rail 1-7 with a sliding block as shown in fig. 1 and fig. 2; the reflecting mirrors 1 to 6 are provided with connecting blocks 1 to 3; the input end of the light program control linear motor 1-1 receives a motor control signal of the motion control module, and the output shaft of the light program control linear motor is a lead screw; a screw nut 1-2 is arranged on the screw; the reflecting mirror 1-6 is arranged on a sliding block of the guide rail 1-7, and meanwhile, the reflecting mirror 1-6 is connected with the screw nut 1-2 through a connecting block 1-3; the light program control linear motor 1-1 is connected with the reflecting mirror 1-6 to drive the reflecting mirror 1-6 to move on the guide rail 1-7 with the sliding block, so that the optical path adjustment of the reference arm is realized; the optical fiber collimator 1-4 is connected with the polarizer 1-12 through an optical fiber, emergent light of the optical fiber collimator 1-4 is reflected through the reflector 1-6, the emergent light of the optical fiber is changed into collimated light, and the collimated light can enter the optical fiber collimator 1-4 after being reflected; the optical path position monitor 1-5 is installed near the track of the reflector 1-6 moving along the guide rail, and the output end thereof is connected with the motion control module, as shown in fig. 2, for feeding back the operation position of the reflector 1-6 until the best matching optical path is found.
The guide rail 1-7 with the sliding block and a lead screw of the optical path control linear motor 1-1 are in a parallel position relationship, as shown in fig. 1.
The number of the optical path position monitors 1-5 is at least 2, as shown in fig. 1.
The optical path position monitor 1-5 is connected with the motion control module in a non-contact connection mode, and the optical path position monitor is a distance sensor and detects the optical path position by continuously sending pulses.
The polarization state matching and adjusting module is composed of a polarization control rotating motor 1-8, a polarizer 1-12 and a polarization position monitor 1-10 as shown in fig. 1 and fig. 2; the head end of the polarization control rotating motor 1-8 is provided with a polarization motor gear 1-9; one end of the polarizer 1-12 is provided with a polarizing gear 1-11; the polarization motor gears 1-9 are in meshed connection with the polarization gears 1-11; the polarizers 1-12 are connected with an optical interference device; the polarization position monitor 1-10 is arranged on one side of the polarizer 1-12; the input end of the polarization control rotating motor 1-8 receives a motor control signal of the motion control module, and the output end of the polarization control rotating motor controls the deflection of the polarizer 1-12 through the polarization motor gear 1-9 and the polarization gear 1-11; the output end of the polarization position monitor 1-10 is connected to a motion control module, as shown in fig. 2, for feeding back the deflection position of the polarizer 1-12, which helps the polarizer 1-12 to deflect to achieve polarization state matching until obtaining the optimal polarization state.
The connection between the polarization position monitor 1-10 and the motion control module is in a non-contact connection mode; the polarization position detector is a distance sensor which detects the moving position of the polarizer in real time by continuously sending pulse signals.
A working method of an adaptive calibration system based on OCT light interference is characterized by comprising the following steps:
(1) After the adaptive calibration system based on OCT light interference is successfully connected with a catheter, automatic calibration is firstly carried out;
(2) After the calibration is finished, the image identification module automatically identifies the image characteristic information by extracting image data and feeds the image characteristic information back to the main control unit in real time;
(3) The main control unit sends the feedback result to the control motion control unit, and the motion control module generates a motor control signal to respectively drive the light program control linear motor 1-1 and the polarization control rotary motor 1-8 to move;
(4) When the linear motor 1-1 is controlled by the optical path to operate, the rotary motion of the screw rod is converted into the linear motion of a screw rod nut, and then the reflector 1-6 is driven to move back and forth on the guide rail 1-7; the polarization control rotating motor 1-8 rotates to enable the polarization motor gear 1-9 to rotate, and the polarization gear 1-11 meshed and connected with the polarization motor gear also rotates correspondingly, so that the polarizer 1-12 is driven to swing;
(5) The optical path position monitor 1-5 monitors the position of the reflector 1-6 moving on the guide rail 1-7 in real time and feeds back the position information to the motion control module in real time; the polarization position detector 1-10 monitors the swinging position of the polarizer 1-12 in real time, and also feeds swinging information back to the motion control module in real time;
(6) The motion control module is connected with the optical path interference module, sends the motion data to the data processing module and displays the motion data on the display module in real time;
(7) The image recognition module judges and calibrates the movement distance according to the image information displayed on the display module in real time, and accurately positions the movement distance;
(8) When the optical path of the reference light is matched with the optical path of the measuring light and has a fixed polarization state, the image calibration is successful, and the main control unit controls the motion control module to lock the position of the motor;
(9) When the external environment changes, the state of the measuring light changes, and the interference effect is influenced, at the moment, the adaptive calibration system based on the OCT light interference can perform automatic calibration again, and the image acquired by the operation is ensured to be the best image effect.
The identification process of the image identification module in the step (2) for automatically identifying the image characteristic information comprises the following steps:
1) Line extraction, namely extracting n lines by using a line spacing extraction method and taking the circle center as a starting point, wherein the number n of the lines can be adjusted according to an algorithm and the number;
2) And (4) carrying out area search and catheter wall identification, and determining the catheter wall imaging position by constructing a constraint algorithm.
The control mode of the photo-programmed linear motor 1-1 in the step (4) comprises comprehensive control and accurate control; the overall control means that the optical path control linear motor 1-1 reciprocates once or for multiple times within a set optical path matching range to determine a search area, wherein the optical path matching range is determined by the fact that the optical path difference between a sample arm and a reference arm is smaller than the self-coherence length of a light source and can be adjusted according to the self-coherence length of the light source; the precise control is that the motor reciprocates once or more times in the search area and gradually approaches to an ideal point, the ideal point refers to that when the motor stops at the position, the corresponding image is a precisely calibrated image, and when the motor is within the set allowable error range of the ideal point, the optical path matching is successful.
The polarization control in the step (4) mainly controls the deflection of the polarizers 1-12 through the polarization control rotating motors 1-8 and the polarization position monitors 1-10 so as to realize the matching of the polarization states, and when the polarization controller deflects to a certain position so that the image information intensity reaches the maximum value, the polarization position is considered as the best matching point.
As shown in fig. 3, when the optical interference adaptive calibration control mode is not added, the calibration of the OCT system image is mainly determined by recognizing the positions of the catheter wall and the image outer tube by human eyes, the calibration process takes a long time, and the calibration results are not completely consistent.
As shown in fig. 4, after the light interference adaptive calibration control mode is added, the calibration of the OCT system image is automatically identified by a software identification constraint algorithm, and the closed-loop control mode makes the time for calibrating the image short and the result consistency better.
Claims (7)
1. An adaptive calibration system based on OCT light interference is characterized by comprising an image recognition module, a main control unit, a motion control unit, a light interference device, a data processing module and a display module; wherein the adaptive calibration system based on OCT light interference is mounted in a reference arm; the motion control unit is used for calibrating light interference and comprises a motion control module, a reference arm optical path adjusting module and a polarization state matching adjusting module; the input end of the motion control module receives an image calibration result of the main control unit, and the output end of the motion control module is respectively connected with the reference arm optical path adjusting module and the polarization state matching adjusting module; the input end of the image identification module is connected with the display module, and the output end of the image identification module is connected with the main control unit; the image recognition module performs characteristic recognition on the collected image and feeds back a recognition result to the main control unit; the main control unit is used for processing an image recognition result and controlling the motion control module; the light interference device is connected with a polarization state matching adjustment module in the motion control unit; the input end of the data processing module is connected with the optical interference device, and the output end of the data processing module is connected with the display module; the display module is used for displaying image information and feeding the image information back to the image identification module;
the reference arm optical path adjusting module consists of an optical path control linear motor, an optical fiber collimator, an optical path position monitor, a reflecting mirror and a guide rail with a sliding block; the reflector is provided with a connecting block; the input end of the light program control linear motor receives a motor control signal of the motion control module, and the output shaft of the light program control linear motor is a lead screw; a screw nut is arranged on the screw; the reflecting mirror is arranged on a sliding block of the guide rail and is connected with the screw nut through a connecting block; the optical path control linear motor is connected with the reflector to drive the reflector to move on the guide rail with the sliding block; the optical fiber collimator is connected with the polarizer through an optical fiber, and emergent light of the optical fiber collimator is reflected through the reflector; the optical path position monitor is arranged near the moving track of the reflector along the guide rail, and the output end of the optical path position monitor is connected with the motion control module;
the polarization state matching and adjusting module consists of a polarization control rotating motor, a polarizer and a polarization position monitor; the head end of the polarization control rotating motor is provided with a polarization motor gear; one end of the polarizer is provided with a polarizing gear; the polarization motor gear is meshed with the polarization gear; the polarizer is connected with the optical interference device; the polarization position monitor is arranged on one side of the polarizer; the input end of the polarization control rotating motor receives a motor control signal of the motion control module, and the output end of the polarization control rotating motor controls the deflection of the polarizer through a polarization motor gear and a polarization gear; the output end of the polarization position monitor is connected with the motion control module;
the identification process of the image identification module for automatically identifying the image characteristic information comprises the following steps:
1) Line extraction, namely extracting n lines by using a line spacing extraction method and taking the circle center as a starting point, wherein the number n of the lines can be adjusted according to an algorithm and the number;
2) And (4) carrying out region search and vessel wall identification, and determining a vessel wall imaging position by constructing a constraint algorithm.
2. The adaptive calibration system for OCT optical interference based on claim 1, wherein the guide rail with the sliding block is parallel to the lead screw of the linear motor for controlling the optical path.
3. An adaptive calibration system based on OCT optical interference as claimed in claim 1, wherein the number of said optical path position monitors is at least 2.
4. The adaptive calibration system based on OCT optical interference of claim 3, wherein the connection between the optical path position monitor and the motion control module is a non-contact connection; the optical path position monitor is a distance sensor.
5. The adaptive calibration system based on OCT optical interference of claim 1, wherein the connection between the polarization position monitor and the motion control module is a non-contact connection; the polarization position monitor is a distance sensor which detects the moving position of the polarizer in real time by continuously sending pulse signals.
6. A working method of an adaptive calibration system based on OCT light interference is characterized by comprising the following steps:
(1) After the adaptive calibration system based on OCT light interference is successfully connected with a catheter, automatic calibration is firstly carried out;
(2) After the calibration is finished, the image identification module automatically identifies the image characteristic information by extracting image data and feeds the image characteristic information back to the main control unit in real time;
(3) The main control unit sends the feedback result to the control motion control unit, and the motion control module generates a motor control signal to respectively drive the light program control linear motor and the polarization control rotary motor to move;
(4) When the linear motor is controlled by the optical path to operate, the rotary motion of the screw is converted into the linear motion of a screw nut, so that the reflector is driven to move back and forth on the guide rail; the polarization control rotating motor rotates to enable the polarization motor gear to rotate, and the polarization gear meshed and connected with the polarization motor gear also rotates, so that the polarizer is driven to swing;
(5) The optical path position monitor monitors the position of the reflector moving on the guide rail in real time and feeds back position information to the motion control module in real time; the polarization position monitor monitors the swinging position of the polarizer in real time and also feeds swinging information back to the motion control module in real time;
(6) The motion control module is connected with the optical path interference module, sends the motion data to the data processing module and displays the motion data on the display module in real time;
(7) The image recognition module judges and calibrates the movement distance according to the image information displayed in real time on the display module, and accurately positions the movement distance;
(8) When the optical path of the reference light is matched with the optical path of the measuring light and has a fixed polarization state, the image calibration is successful, and the main control unit controls the motion control module to lock the position of the motor;
(9) When the external environment changes, the state of the measuring light changes, the interference effect is influenced, and at the moment, the self-adaptive calibration system based on the OCT light interference can perform automatic calibration again;
the recognition process of the image recognition module in the step (2) for automatically recognizing the image characteristic information comprises the following steps:
1) Line extraction, namely extracting n lines by using a line spacing extraction method and taking the circle center as a starting point, wherein the number n of the lines can be adjusted according to an algorithm and the number;
2) And (4) carrying out area search and catheter wall identification, and determining the catheter wall imaging position by constructing a constraint algorithm.
7. The working method of the adaptive calibration system based on OCT light interference of claim 6, wherein the control mode of the photo-controlled linear motor in step (4) includes both full control and precise control; the comprehensive control means that the linear motor is controlled by the optical path to reciprocate once or for multiple times within a set optical path matching range to determine a search area, wherein the optical path matching range is determined by the fact that the optical path difference between the sample arm and the reference arm is smaller than the self-coherence length of the light source and can be adjusted according to the self-coherence length of the light source; the precise control is that the motor reciprocates once or for a plurality of times in the area near the ideal point and gradually approaches the ideal point, and when the motor is in the set allowable error range of the ideal point, the optical path matching is successful;
in the step (4), the polarization control mainly controls the rotating motor and the polarization position monitor through polarization control, so that the deflection of the polarizer is controlled to realize the matching of the polarization state, and when the polarization controller deflects to a certain position, the image information intensity reaches the maximum value, the polarization position is considered as the best matching point.
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