An optical path self-adjusting gas expansion laser-induced fluorescence detection device and method

Abstract

The present invention discloses an optical path self-adjusting gas expansion laser-induced fluorescence detection device and method, which relates to technical fields such as optics, automatic control, and atmospheric environment monitoring. An incident optical head of N optical fibers is fixed on an optical fiber automatic coupler, and the laser emitted by a light source module is selected to be coupled into a certain optical fiber, and this optical fiber serves as a transmission optical fiber to conduct the laser into a sampling measurement module; an exit optical head neck of N optical fibers is fixed on an automatic optical fiber changer, and the exit optical head of the transmission optical fiber is selected to be input into an automatic adjustment collimator; the automatic adjustment collimator is used to fix the exit optical head of the transmission optical fiber and adjust the collimation distance of the transmission optical fiber to output a collimated light beam; an automatic adjustment beam splitter is used to coaxially adjust the collimated light beam output from the automatic adjustment collimator into the sampling measurement module; the sampling measurement module is a place where the collimated light beam intersects with active intermediates to generate fluorescence, and collects the fluorescence signal; the monitoring and control system is used to monitor the energy of the laser at various locations in the detection device, control the operation of the optical fiber automatic coupler, the automatic optical fiber changer, the automatic adjustment collimator, and the automatic adjustment beam splitter, and at the same time perform calculation and processing on the fluorescence signal output by the sampling measurement module, and finally obtain the real-time concentration data of the active intermediates. The purpose of the present invention is to realize the automation of the optical fiber replacement and optical path adjustment processes, thereby improving the operation stability of the gas expansion laser-induced fluorescence detection technology and realizing unattended operation.

Description

Technical Field

[0001] The present invention relates to the technical fields of optics, atmospheric environment monitoring, automation control, etc., and in particular to a gas expansion laser-induced fluorescence detection device and method with self-adjusting optical path. Background Art

[0002] Laser-induced fluorescence technology has been used for the detection of components in the atmosphere, water bodies, organic substances, etc. for many years. Based on the low-pressure environment laser-induced fluorescence technology to measure the concentration of reactive intermediates, this method is called gas expansion laser-induced fluorescence technology, which is the main measurement technology for reactive intermediates in the ambient atmosphere. A gas expansion laser-induced fluorescence instrument mainly includes a laser light source, a set of special low-pressure fluorescence detection cells, a highly sensitive photomultiplier tube, and a set of standard source devices. Gas sampling uses gas expansion technology, and the reactive intermediates in the atmosphere are sampled through a small hole with a diameter of 1 mm or less above the fluorescence detection cell. The air flow sample expands rapidly below the sampling port, and the laser light source continuously excites the reactive intermediates in the sampled air flow to generate fluorescence signals. The concentration of the reactive intermediates is calculated based on the intensity of the fluorescence signals generated by the excitation in combination with the standard source. Gas expansion laser-induced fluorescence technology has the advantages of small sampling loss, low system detection limit, and small interference, but there are also some disadvantages. As mentioned above, the data measured by gas expansion laser-induced fluorescence technology is the intensity of the fluorescence signal, and the concentration of the reactive intermediates can only be deduced inversely after obtaining the calibration coefficient through calibration with the standard source. The calibration coefficient is affected by many factors, and the replacement of the optical fiber and the change of the optical path state over time are the most influential factors. Since a gas expansion laser-induced fluorescence instrument generally transmits the laser emitted by the light source to the low-pressure fluorescence detection cell through an optical fiber, and the life of the optical fiber is limited, it is inevitable to replace the optical fiber. However, replacing the optical fiber is a cumbersome process, and there are many detailed factors that are difficult to control manually. It is impossible for humans to ensure the consistency before and after replacing the optical fiber well, and the state of the optical path will change slowly over time, which leads to a large change in the calibration coefficient before and after replacing the optical fiber or over time, resulting in poor system stability of the gas expansion laser-induced fluorescence instrument. And sometimes, when the gas expansion laser-induced fluorescence instrument is installed at positions such as superstations (atmospheric monitoring superstations), observation towers, etc., or when the operating environment of the system is extremely harsh, it is also very inconvenient to replace the optical fiber manually, and it is impossible to judge the change of the optical fiber state over time in real time manually. Summary of the Invention

[0003] To overcome the above-mentioned defects in the prior art, the present invention provides a gas expansion laser-induced fluorescence detection device with self-adjusting optical path, aiming to automate the process of fiber replacement and optical path adjustment, and precisely and real-time control the optical path adjustment effect through the laser energy monitored at various places in the detection device, so as to improve the fiber adjustment effect and the consistency before and after fiber replacement, and can correct in real time the changes in the optical path state over time, thereby improving the stability of the gas expansion laser-induced fluorescence instrument system and enabling the instrument to operate unattended for a long time.

[0004] To achieve the above object, the present invention adopts the following technical solutions, including:

[0005] A gas expansion laser-induced fluorescence detection device with self-adjusting optical path, the detection device includes: a light source module, N optical fibers, an optical fiber automatic coupler, an automatic fiber changer, an automatic collimator, an automatic beam splitter, a sampling measurement module, and a monitoring and control system;

[0006] The light source module is used to emit laser light that causes the active intermediate to generate fluorescence;

[0007] The optical fiber automatic coupler is fixed with the input optical heads of N optical fibers, and is used to selectively couple the laser light emitted by the light source module into a certain optical fiber, and this optical fiber serves as the transmission optical fiber for conducting the laser light into the sampling measurement module;

[0008] The automatic fiber changer is fixed with the neck of the output optical heads of N optical fibers, and is used to selectively input the output optical head of the transmission optical fiber into the automatic collimator;

[0009] The automatic collimator is used to fix the output optical head of the transmission optical fiber and adjust the collimation distance of the transmission optical fiber to output a collimated beam;

[0010] The automatic beam splitter is used to coaxially adjust the collimated beam output from the automatic collimator into the sampling measurement module;

[0011] The sampling measurement module is the place where the collimated beam intersects with the active intermediate to generate fluorescence, and collects the fluorescence signal;

[0012] The monitoring and control system is used to monitor the laser energy at various places in the detection device, control the operation of the optical fiber automatic coupler, the automatic fiber changer, the automatic collimator, and the automatic beam splitter, and at the same time perform calculation and processing on the fluorescence signal output by the sampling measurement module, and finally obtain the real-time concentration data of the active intermediate.

[0013] Preferably, the fiber optic automatic coupler includes: an optical flat plate for fixing components on the fiber optic automatic coupler, a two-dimensional translation stage for translating the fiber optic inlet head forward, backward, left, and right, a lens bracket for fixing a coupling lens, a coupling lens for focusing and coupling the laser emitted by the light source module into the fiber optic inlet head, a first fixing bracket for fixing the first rotary table to the two-dimensional translation stage, a first rotary table for rotating the fiber optic inlet head around the center of the first rotary table, a first rotary disk for increasing the rotation radius of the first rotary table and fixing the fiber optic inlet head, and an electric regulator for controlling the automatic rotation of a knob;

[0014] The two-dimensional translation stage and the lens bracket are fixed on the optical flat plate. The first rotary table is fixed on the translation top surface of the two-dimensional translation stage through the first fixing bracket, and the rotation top surface of the first rotary table is perpendicular to the translation top surface of the two-dimensional translation stage. The electric regulator is installed on the knobs for adjusting the forward / backward and left / right translation of the translation stage on the two-dimensional translation stage, and the electric regulator is also installed on the knob for adjusting the rotation of the rotary table on the first rotary table. N SMA threaded posts for installing the fiber optic inlet head are provided on the periphery of one side of the first rotary disk, and one optical fiber is installed on each SMA threaded post. The other side of the first rotary disk is coaxially installed on the rotation top surface of the first rotary table. The coupling lens is installed on the lens bracket, and the coupling lens is coaxial with one of the optical fibers installed on the first rotary disk.

[0015] Preferably, the automatic fiber optic changer includes: a fiber optic fixing clip for clamping the neck of the fiber optic outlet head, a second rotary disk for installing the fiber optic fixing clip, a second rotary table for driving the second rotary disk to rotate, a slide table for driving the fiber optic outlet head to move forward and backward, a slide rail for enabling the slide table to move linearly forward and backward, a second fixing bracket for fixing the second rotary table to the slide table, a cam for pushing the slide table to move forward and backward, a servo motor for driving the cam to rotate, a servo motor fixing bracket for installing and fixing the servo motor, a second tension spring for generating an elastic tension force between the slide table and the servo motor fixing bracket, and an electric regulator for controlling the automatic rotation of a knob;

[0016] The sliding table is fitted and installed on the slide rail. The second rotating table is fixed on the top surface of the sliding table through the second fixing bracket, and the rotating top surface of the second rotating table is perpendicular to the top surface of the slide rail. The electric regulator is installed on the knob for adjusting the rotation of the rotating table on the second rotating table. N through holes are formed in the periphery of the second rotating disk. On one side of the second rotating disk, optical fiber fixing clips are respectively installed at each through hole, and an optical fiber is clamped on each optical fiber fixing clip. The clamping position is the neck of the optical fiber output head. The other side of the second rotating disk is installed on the rotating top surface of the second rotating table. The servo fixing bracket is fixed on one side of the slide rail far away from the second rotating table. The servo is fixed on the servo fixing bracket, and the output shaft of the servo is perpendicular to the top surface of the sliding table. The cam is installed on the output shaft of the servo. The sliding table and the servo fixing bracket are connected by a second tension spring, so that there is always an elastic tension between the two, so that the cam is always in contact with the sliding table.

[0017] Preferably, the optical fiber fixing clip includes: an upper clip and a lower clip for clamping the optical fiber, and a torsion spring for clamping the upper clip and the lower clip to each other;

[0018] Two fixing holes for fixing to the second rotating disk are formed on one side of the lower clip. The clamping hole formed after the upper clip and the lower clip are assembled is a cylindrical hole with a chamfer. The inner diameter of the clamping hole is smaller than the diameter of the neck of the optical fiber output head. The torsion spring is installed on the inner sides of the legs of the upper clip and the lower clip.

[0019] Preferably, the automatic collimator includes: an optical fiber collimator for collimating the divergent light emitted by the optical fiber, an optical fiber rotator for fixing or removing the output head of the optical fiber to or from the optical fiber collimator, and a reduction stepping motor for driving the optical fiber collimator to achieve automatic focusing;

[0020] A gear is installed on the output shaft of the reduction stepping motor and meshes with the gear on the optical fiber collimator. The optical fiber collimator is installed in the collimator cage mounting frame.

[0021] Preferably, the optical fiber rotator includes: a fixing plate for installing a micro-rotating rod, a gear and a motor fixing bracket, a micro-expansion rod that can be telescoped in the micro-rotating rod, a micro-rotating rod for driving an elastic friction rod, an elastic friction rod that can drive the SMA threaded head of the optical fiber output head to rotate clockwise or counterclockwise, a gear for transmitting the rotational output of the micro-stepping motor to the micro-rotating rod, a micro-stepping motor for driving the gear to rotate, and a motor fixing bracket for fixing the micro-stepping motor to the fixing plate;

[0022] A through hole is formed in the fixed plate, and the diameter of the through hole is larger than the diameter of the SMA threaded head of the optical fiber output head; on one side of the fixed plate, a micro stepping motor with a gear mounted on the output shaft and two gears are installed. The two gears are located on the upper and lower sides of the micro stepping motor and are meshed with the gear on the output shaft of the micro stepping motor. The micro stepping motor is fixed to the fixed plate through a motor fixing bracket; on the other side of the fixed plate, a set of multi-link mechanisms are symmetrically installed above and below the through hole. The multi-link mechanism is composed of two micro rotating rods, two micro telescopic rods and an elastic friction rod; in a set of multi-link mechanisms, one of the micro rotating rods is connected to a gear mounted on the back of the fixed plate, and the two rotate together, and the other micro rotating rod rotates passively; the micro telescopic rod is inserted into the micro rotating rod, and a thrust spring is arranged in the micro rotating rod so that the micro telescopic rod always has an elastic thrust when telescoping in the micro rotating rod; a serrated rubber pad is pasted on the lower part of the elastic friction rod, and hinges are arranged at both ends of the elastic friction rod and are connected to the ends of the micro telescopic rods, and the two can rotate relative to each other at the position of the hinge; the SMA threaded head of the optical fiber output head passes through the through hole formed in the fixed plate and is clamped by the two elastic friction rods.

[0023] Preferably, the optical fiber collimator includes: a gear threaded cylinder for driving the lens mounting cylinder to move left and right, a collimating lens for collimating the divergent light emitted by the optical fiber, a lens retaining ring for fixing the collimating lens, and a lens mounting cylinder for mounting and fixing the collimating lens;

[0024] The collimator cage mounting frame is provided with an SMA threaded post for fixing the optical fiber output head. A cylinder with a fine pitch external thread is coaxially provided on the back of the SMA threaded post; a groove for mounting the collimating lens is formed on one side of the lens mounting cylinder, and a fine pitch reverse external thread is provided on the other side; the gear threaded cylinder is a cylindrical structure with gears provided on the outer surface. The first half of the inner surface is provided with a fine pitch forward internal thread and is meshed with the fine pitch forward external thread of the cylinder on the collimator cage mounting frame, and the second half is provided with a fine pitch reverse internal thread and is meshed with the fine pitch reverse external thread on the lens mounting cylinder; a chute for matching with the inner side of the lens mounting cylinder is formed on the outside of the cylinder with a fine pitch forward external thread on the collimator cage mounting frame, so that left and right sliding movement occurs between the two.

[0025] Preferably, the automatic beam splitter includes: a 45-degree cage mirror mount, a 45-degree motor mounting bracket for fixing the electric regulator to the 45-degree cage mirror mount, and an electric regulator for controlling the automatic rotation of the knob on the 45-degree cage mirror mount;

[0026] A second beam splitter is installed inside the 45-degree cage mirror mount. The second beam splitter is used to split the collimated beam output from the automatic adjustment collimator. The 45-degree cage mirror mount is connected to the collimator cage mount. There are two electric regulators installed on the automatic adjustment beam splitter, which are respectively installed on the two adjustment knobs of the 45-degree cage mirror mount to adjust the deflection angle of the second beam splitter, and are both fixed to the 45-degree cage mirror mount through the 45-degree motor mount.

[0027] Preferably, the electric regulator includes: a replaceable joint for driving the optical mechanical part knob to rotate, a joint sleeve for driving the replaceable joint to rotate, a micro-decelerating stepper motor for driving the joint sleeve to rotate, an elastic coupling for connecting the micro-decelerating stepper motor and the joint sleeve, a jacket for fixing the electric regulator to the optical mechanical part, an inner sleeve for the micro-decelerating stepper motor and enabling the micro-decelerating stepper motor to slide up and down relative to the jacket, and a first tension spring for generating elastic tension between the jacket and the inner sleeve.

[0028] Preferably, the light source module includes: a laser for emitting laser light that can cause the active intermediate to generate fluorescence and a first beam splitter. The first beam splitter is used to split the laser light emitted by the laser.

[0029] Preferably, the sampling and measurement module includes: a fluorescence cell where the collimated beam intersects with the sampling air flow to generate fluorescence, a sampling nozzle for generating a high-speed jet of the ambient atmosphere carrying the active intermediate, and a light arm for reducing stray light around the collimated beam.

[0030] The sampling nozzle is a conical structure with a small hole opened at the top. The sampling nozzle is located above the fluorescence cell and the cone tip is away from the fluorescence cell. Light arms are installed on both the left and right sides of the fluorescence cell, and a vacuum pump is connected below the fluorescence cell. Among them, the collimated beam output from the automatic adjustment collimator enters the fluorescence cell through the light arm on the right side. After the collimated beam intersects with the active intermediate in the fluorescence cell to generate fluorescence, it then exits from the light arm on the left side.

[0031] A window for sealing the cavity and transmitting laser light is installed at the outer end of the light arm, i.e., the end away from the fluorescence cell. Multiple conical diaphragms are installed inside the light arm. A photomultiplier tube is installed on the back of the fluorescence cell.

[0032] Preferably, the monitoring and control system includes: an energy meter No. 1 for monitoring the first laser energy emitted from the sampling and measurement module, an energy meter No. 2 for monitoring the second laser energy emitted from the light source module, an energy meter No. 3 for monitoring the third laser energy emitted from the automatic collimator, a single-chip microcomputer, and an industrial control computer; the single-chip microcomputer is used to control the rotation of all motors in the detection device; the industrial control computer is used to receive the energy signals of each energy meter and receive the fluorescence signal, and control the operation of the single-chip microcomputer.

[0033] An optical path self-adjusting gas expansion laser-induced fluorescence detection method, applicable to the above-mentioned optical path self-adjusting gas expansion laser-induced fluorescence detection device, the method for automatically replacing the optical fiber includes the following steps:

[0034] S11, the monitoring and control system monitors the first laser energy emitted from the sampling and measurement module, the second laser energy emitted from the light source module, and the third laser energy emitted from the automatic collimator. When the third laser energy is less than 1 / 4 of the second laser energy, the next optical fiber is selected as the new transmission optical fiber through the optical fiber automatic coupler;

[0035] S12, the automatic collimator disassembles the output head of the old transmission optical fiber that is currently fixed;

[0036] S13, the servo motor of the automatic optical fiber changer rotates, so that the sliding table drives the optical fiber fixing clamp on the second rotating disk to move close to the automatic collimator, so that the optical fiber fixing clamp squeezes and clamps the neck of the output head of the old transmission optical fiber through the clamping hole with a chamfer on the cylindrical hole. The servo motor rotates again, so that the sliding table drives the second rotating disk to move away from the automatic collimator, so that the old transmission optical fiber clamped by the optical fiber fixing clamp is detached from the optical fiber rotator;

[0037] S14, rotate the second rotating disk of the automatic optical fiber changer to align the output head of the new transmission optical fiber with the input end of the automatic collimator;

[0038] S15, the servo motor of the automatic optical fiber changer rotates, so that the sliding table drives the output head of the new transmission optical fiber on the second rotating disk to move close to the automatic collimator, and inserts the output head of the new transmission optical fiber into the automatic collimator;

[0039] S16, the automatic collimator fixes the output head of the new transmission optical fiber;

[0040] S17, the servo motor of the automatic optical fiber changer rotates, so that the sliding table drives the second rotating disk to move away from the automatic collimator, so that the output head of the new transmission optical fiber is detached from the optical fiber fixing clamp.

[0041] The advantages of the present invention are:

[0042] (1) A gas expansion laser-induced fluorescence detection device with self-adjusting optical path provided by the present invention aims to automate the process of fiber optic replacement and optical path adjustment, and precisely and real-time control the optical path adjustment effect through the laser energy monitored at various parts of the detection device, so as to improve the fiber optic adjustment effect and the consistency before and after fiber optic replacement, and can correct in real time the changes in the optical path state over time, thereby improving the stability of the gas expansion laser-induced fluorescence instrument system and enabling the instrument to operate unattended for a long time.

[0043] (2) The fiber optic automatic coupler of the device of the present invention drives the fiber optic inlet head to move by using an optical two-dimensional translation stage and an optical rotary stage with very high precision, so that the adjustment precision of the fiber optic is very high. The up and down movement of the fiber optic inlet head is driven by the optical rotary stage. When the rotation angle is small, the up and down coupling position of the fiber optic inlet head can be finely adjusted. When the rotation angle is large, the effect of replacing the fiber optic can be achieved.

[0044] (3) The up and down movement of the fiber optic outlet head clamped on the automatic fiber optic changer of the device of the present invention is driven by the optical rotary stage, with very high precision, and can be accurately aligned with the SMA threaded post on the automatic collimator.

[0045] (4) The neck of the fiber optic outlet head of the device of the present invention is clamped to the automatic fiber optic changer through a fiber optic fixing clip. This makes it possible that after the fiber optic outlet head is fixed to the SMA threaded post of the automatic collimator, the neck of the fiber optic outlet head can be detached from the fiber optic fixing clip under the action of tension. Also, since the inner surface of the fiber optic fixing clip clamping the fiber optic neck is provided with a chamfer, when the fiber optic outlet head is unscrewed from the SMA threaded post of the automatic collimator, the neck of the fiber optic outlet head can be clamped to the fiber optic fixing clip again under the action of thrust. This design enables that after the fiber optic is replaced, there is no rigid contact between the automatic fiber optic changer and the fiber optic, so that the vibration or state change of the automatic fiber optic changer with a large size and weight does not affect the normal operation of the fiber optic.

[0046] (5) The fiber optic rotator of the device of the present invention is driven by a multi-link mechanism driven by a stepping motor. Since the micro telescopic rod can slightly expand and contract within the micro rotary rod, and the elastic friction rod has certain elasticity and large friction force, this enables the forward and reverse rotation of the fiber optic outlet head to be achieved by only one motor.

[0047] (6) The change of the focusing distance of the automatic collimator of the device of the present invention is realized by the rotation of a fine thread. Half of the inner wall of the gear threaded cylinder is provided with a forward thread, and the other half is provided with a reverse thread. And a cylinder with a fine thread external thread is opened on the collimator cage mounting frame. A chute is provided on the outside of the cylinder to cooperate with the inside of the lens mounting cylinder, so that only left and right sliding movement can occur between the two. This enables the automatic collimator driven by a stepping motor to finely adjust the focusing distance directly after the fiber optic is installed, without unscrewing the fiber optic.

[0048] (7) The replaceable joint of the electric regulator of the device of the present invention is connected to the micro-decelerating stepper motor that drives its rotation through an elastic coupling, and the replaceable joint can elastically stretch and contract. This enables the electric regulator to be installed on the knobs of the vast majority of standard manual optical mechanical parts through a simple fixing bracket, and normal transmission can be achieved without precise alignment. In addition, the replaceable joint adopts a magnetic adsorption and replaceable method, enabling the electric regulator to match the knobs of the vast majority of models of standard manual optical mechanical parts. Therefore, the electric regulator of the device of the present invention has strong versatility and can turn the vast majority of standard manual optical mechanical parts into electric optical mechanical parts. This greatly expands the functions of manual optical mechanical parts and reduces costs compared with fully electric optical mechanical parts. For example, an electric regulator is only installed on a knob that needs to be frequently adjusted on a three-dimensional translation stage, and it can also be removed at any time and installed on other optical mechanical parts.

[0049] (8) After the electric regulator of the device of the present invention is installed on the optical mechanical part, the adjustment of the optical path still uses its own adjustment knob, so that the optical mechanical part installed with the electric regulator still has the original high precision. Moreover, the electric regulator is driven by a micro-decelerating stepper motor, so that the electric regulator can be self-locked when powered on, and when not powered on, the original manual knob can still be used.

[0050] (9) The monitoring and control system of the device of the present invention uses three energy meters distributed inside the device of the present invention. This enables the industrial control computer to accurately control the movement of the stepper motor inside the device through the single-chip microcomputer after obtaining the energy at these three key positions, so that the coupling, collimation, and coaxiality of the optical fiber remain stable before and after replacement. At the same time, the energy state of each position can be monitored in real time, so that the change in the optical fiber state caused by the passage of time can be corrected in real time.

[0051] (10) The present invention also provides a fluorescence detection method, including methods for automatic optical fiber replacement, automatic optical fiber coupling, automatic optical fiber collimation, and automatic coaxiality adjustment, which can realize real-time correction of the coupling, collimation, and coaxiality states of the optical fiber. The method of the present invention can automate the cumbersome work of replacing optical fibers, and accurately realize the work of optical fiber coupling, collimation, and coaxiality adjustment that is difficult for manual control to accurately achieve through the combination of automatic optomechanics and energy monitoring. Thereby, the consistency of the optical path before and after optical fiber replacement is ensured, and the stability of the gas expansion laser-induced fluorescence detection technology, whose system sensitivity is greatly affected by the coupling, collimation effect, and collimated light coaxiality of the optical fiber, is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic structural diagram of a gas expansion laser-induced fluorescence detection device with self-adjusting optical path provided by an embodiment of the present invention.

[0053] Figure 2 It is a cross-sectional view and an axonometric view of the electric regulator provided by an embodiment of the present invention.

[0054] Figure 3 It is an axonometric view of the optical fiber automatic coupler provided by an embodiment of the present invention.

[0055] Figure 4 It is an axonometric view of the automatic optical fiber changer provided by an embodiment of the present invention.

[0056] Figure 5 It is an axonometric view and a cross-sectional view of the optical fiber fixing clip and the optical fiber output optical head provided by an embodiment of the present invention.

[0057] Figure 6 It is an axonometric view of the automatic collimator and the automatic beam splitter provided by an embodiment of the present invention.

[0058] Figure 7 It is a rear view and an axonometric view of the optical fiber rotator provided by an embodiment of the present invention.

[0059] Figure 8 It is a cross-sectional view and an axonometric view of the optical fiber coupler provided by an embodiment of the present invention.

[0060] Figure 9 It is a front view of the No. 2 rotating disk provided by an embodiment of the present invention.

[0061] The meanings of the reference numerals are as follows:

[0062] 1 - Sampling nozzle, 2 - Fluorescence cell, 3 - First energy meter, 4 - Diaphragm, 5 - Optical arm, 6 - Automatic adjustment collimator, 601 - Deceleration stepper motor, 602 - Fiber optic rotator, 6021 - Fixed plate, 6022 - Micro telescopic rod, 6023 - Micro rotating rod, 6024 - Elastic friction rod, 6025 - Gear, 6026 - Micro stepper motor, 6027 - Motor fixing bracket, 603 - Rotator fixing plate, 604 - Collimator cage mounting bracket, 605 - Fiber optic collimator, 6051 - Gear threaded cylinder, 6052 - Collimating lens, 6053 - Lens retaining ring, 6054 - Lens mounting cylinder, 606 - Cage adapter plate, 7 - Automatic fiber optic changer, 701 - Fiber optic fixing clip, 7011 - Torsion spring, 7012 - Upper clip, 7013 - Lower clip, 702 - Second rotating disk, 7021 - Quarter - circle edge, 7022 - Fiber optic through - hole, 7023 - Fiber optic clip mounting hole, 703 - Second rotating table, 704 - Slide rail, 705 - Slide table, 706 - Second fixing bracket, 707 - Second tension spring, 708 - Cam, 709 - Servo fixing bracket, 7010 - Servo, 8 - Single - chip microcomputer, 9 - Optical fiber, 10 - Fiber optic automatic coupler, 1001 - Optical flat plate, 1002 - Two - dimensional translation stage, 1003 - Lens support, 1004 - Coupling lens, 1005 - First fixing bracket, 1006 - First rotating table, 1007 - First rotating disk, 11 - Second energy meter, 12 - Laser, 13 - First beam splitter, 14 - Industrial control computer, 15 - Third energy meter, 16 - Automatic adjustment beam splitter, 1601 - 45 - degree cage mirror mount, 1602 - 45 - degree motor mounting bracket, 17 - Electric regulator, 1701 - Magnet, 1702 - Elastic coupling, 1703 - Replaceable joint, 1704 - Joint sleeve, 1705 - Outer housing, 1706 - Inner housing, 1707 - Micro - deceleration stepper motor, 1708 - First tension spring. Detailed implementation mode

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0064] Embodiment 1

[0065] As Figure 1 shown, a gas expansion laser - induced fluorescence detection device with self - adjusting optical path includes: a light source module, an optical fiber 9, an electric regulator 17, a fiber optic automatic coupler 10, an automatic fiber optic changer 7, an automatic adjustment collimator 6, an automatic adjustment beam splitter 16, a sampling and measurement module, and a monitoring and control system;

[0066] The light source module is used to emit a laser that causes the active intermediate to fluoresce;

[0067] On the fiber optic automatic coupler 10, the input optical heads of N optical fibers 9 are fixed, which are used to selectively couple the laser emitted by the light source module into a certain optical fiber 9, and this optical fiber 9 serves as the transmission optical fiber for conducting the laser into the sampling measurement module;

[0068] On the automatic fiber optic changer 7, the neck parts of the output optical heads of N optical fibers 9 are fixed, which are used to selectively input the output optical head of the transmission optical fiber into the automatic collimator 6;

[0069] The automatic collimator 6 is used to fix the output optical head of the transmission optical fiber and adjust the collimation distance of the transmission optical fiber to output a collimated light beam;

[0070] The automatic beam splitter 16 is used to adjust the collimated light beam output from the automatic collimator 6 into the sampling measurement module;

[0071] The sampling measurement module is a place where the collimated light beam intersects with the active intermediate to generate fluorescence, and collects the fluorescence signal;

[0072] The monitoring and control system is used to monitor the energy of the laser at various places in the detection device, control the operation of the fiber optic automatic coupler 10, automatic fiber optic changer 7, automatic collimator 6 and automatic beam splitter 16, and simultaneously perform calculation and processing on the fluorescence signal output by the sampling measurement module, and finally obtain the real-time concentration data of the active intermediate.

[0073] See Figure 1 , the light source module includes: a laser 12 that emits a laser capable of causing the active intermediate to fluoresce and a first beam splitter 13 that deflects the laser by 90 degrees and splits the beam.

[0074] Specifically, the first beam splitter 13 is installed at the light output port of the laser 12, the beam splitting surface forms an angle of forty-five degrees with the laser emitted by the laser 12, and the transmittance of the first beam splitter 13 is 10%.

[0075] See Figure 1 , the sampling measurement module includes: a sampling nozzle 1 that causes the ambient atmosphere carrying the active intermediate to generate a high-speed jet, a fluorescence cell 2 where the collimated light beam intersects with the sampling air flow to generate fluorescence, and a light arm 5 that reduces the stray light around the collimated light beam.

[0076] Specifically, the sampling nozzle 1 has a conical structure with a small hole at the top. It is installed at the lower part of the fluorescence cell 2, and the cone tip is away from the fluorescence cell 2. Light arms 5 are installed on both the left and right sides of the fluorescence cell 2. The light arms 5 are cylindrical, and multiple conical diaphragms are installed inside them. At the outer ends of the light arms 5, i.e., the ends away from the fluorescence cell 2, a window plate for sealing the cavity and transmitting laser light is installed. A photomultiplier tube is installed on the back of the fluorescence cell 2, and the lower part of the fluorescence cell 2 is connected to a vacuum pump. The collimated beam output from the automatic collimator 6 enters the fluorescence cell 2 through the right light arm 5. After the collimated beam intersects with the active intermediate in the fluorescence cell 2 to generate fluorescence, it then exits from the left light arm 5.

[0077] See Figure 1 , the monitoring and control system includes: an energy meter 3 for monitoring the first laser energy exiting from the left light arm 5 of the sampling measurement module, an energy meter 11 for monitoring the second laser energy exiting from the laser 12 of the light source module, an energy meter 15 for monitoring the energy of the third laser (collimated beam) exiting from the automatic collimator 6, a diaphragm 4 for positioning the center of the collimated beam, a single-chip microcomputer 8 for controlling the rotation of all motors within the device of the present invention, and an industrial control computer 14 for receiving the signals from the three energy meters and the photomultiplier tube and controlling the single-chip microcomputer 8.

[0078] Specifically, the diaphragm 4 is located between the left light arm 5 of the sampling measurement module and the energy meter 3, and is used for positioning the center of the collimated beam. Its aperture is consistent with the diameter of the collimated beam. The energy meter 3, the diaphragm 4, and the light arm 5 are all coaxially installed. The industrial control computer 14 directly receives the signals from the energy meter 3, the energy meter 11, the energy meter 15, and the photomultiplier tube installed on the back of the fluorescence cell 2. The industrial control computer 14 indirectly controls the rotation of all motors within the device of the present invention through the single-chip microcomputer 8.

[0079] Embodiment 2

[0080] See Figure 3 , the fiber optic automatic coupler 10 that can be used in the above Embodiment 1 includes: an optical flat plate 1001 for fixing the components on the fiber optic automatic coupler 10, a two-dimensional translation stage 1002 that can translate the fiber optic 9 into the optical head forward, backward, left, and right, a lens bracket 1003 for fixing the coupling lens 1004, a coupling lens 1004 for focusing and coupling the laser light emitted by the light source module into the fiber optic 9 into the optical head, a fiber optic 9 for conducting the laser light generated by the light source module into the sampling measurement module, a first fixing bracket 1005 for fixing the first rotating stage 1006 to the two-dimensional translation stage 1002, a first rotating stage 1006 that can rotate the fiber optic 9 into the optical head around the center of the first rotating stage 1006, a first rotating disk 1007 for increasing the rotation radius of the first rotating stage 1006 and fixing the fiber optic 9 into the optical head, and an electric regulator 17 for automatically rotating the knobs on the two-dimensional translation stage 1002 and the first rotating stage 1006;

[0081] Specifically, the two-dimensional translation stage 1002 and the lens holder 1003 are fixed on the optical flat plate 1001. The first rotary stage 1006 is fixed on the translation top surface of the two-dimensional translation stage 1002 through the first fixing bracket 1005, and the rotary top surface of the first rotary stage 1006 is perpendicular to the translation top surface of the two-dimensional translation stage 1002. There are three electric regulators 17 installed on the optical fiber automatic coupler 10, which are respectively installed on the two translation knobs of the two-dimensional translation stage 1002 and the rotary knob of the first rotary stage 1006, and are all fixed to the bottoms of these three knobs through a fixing bracket. The first rotary disk 1007 is disk-shaped, and eight SMA threaded posts for installing the optical fiber 9 into the optical head are provided on the periphery of one side thereof. An optical fiber 9 is installed on each of the eight SMA threaded posts. The other side of the first rotary disk 1007 provided with the SMA threaded posts is coaxially installed on the rotary top surface of the first rotary stage 1006. The coupling lens 1004 is installed on the lens holder 1003, and the coupling lens 1004 is coaxial with the rightmost optical fiber 9 installed on the first rotary disk 1007.

[0082] The two electric regulators 17 installed on the two-dimensional translation stage 1002 can drive the optical fiber 9 into the optical head to move along the positive or negative direction of the X / Y axis shown by rotating clockwise or counterclockwise. Figure 3 The electric regulator 17 installed on the first rotary stage 1006 can drive the optical fiber 9 to rotate around the central axis of the first rotary stage 1006 by rotating clockwise or counterclockwise. When the optical fiber 9 is at the rightmost side shown, and the electric regulator 17 installed on the first rotary stage 1006 rotates slowly, the optical fiber 9 into the optical head approximately moves along the positive or negative direction of the Z axis shown. Figure 3 The electric regulator 17 installed on the first rotary stage 1006 can drive the optical fiber 9 to rotate around the central axis of the first rotary stage 1006 by rotating clockwise or counterclockwise. When the optical fiber 9 is at the rightmost side shown, and the electric regulator 17 installed on the first rotary stage 1006 rotates slowly, the optical fiber 9 into the optical head approximately moves along the positive or negative direction of the Z axis shown. Figure 3 The electric regulator 17 installed on the first rotary stage 1006 can drive the optical fiber 9 to rotate around the central axis of the first rotary stage 1006 by rotating clockwise or counterclockwise. When the optical fiber 9 is at the rightmost side shown, and the electric regulator 17 installed on the first rotary stage 1006 rotates slowly, the optical fiber 9 into the optical head approximately moves along the positive or negative direction of the Z axis shown.

[0083] Embodiment 3

[0084] Refer to Figure 4 , the automatic optical fiber changer 7 that can be used in the above Embodiment 1 includes: an optical fiber fixing clip 701 that clamps the neck of the optical fiber 9 out of the optical head, a second rotary disk 702 on which the optical fiber fixing clip 701 is installed, a second rotary stage 703 that drives the second rotary disk 702 to rotate, a slide rail 704 that enables the slide table 705 to only move linearly back and forth, a slide table 705 that drives the optical fiber 9 out of the optical head to move back and forth, a second fixing bracket 706 that fixes the second rotary stage 703 to the slide table 705, a second tension spring 707 that generates an elastic tension between the slide table 705 and the servo fixing bracket 709, a cam 708 that pushes the slide table 705 to move back and forth, a servo fixing bracket 709 for installing and fixing the servo 7010, a servo 7010 that drives the cam 708 to rotate, and an electric regulator 17 that controls the automatic rotation of the knob on the second rotary stage 703.

[0085] Specifically, the sliding table 705 is fitted and installed on the slide rail 704. The second rotating table 703 is fixed to the top surface of the sliding table 705 through the second fixing bracket 706. The rotating top surface of the second rotating table 703 is perpendicular to the top surface of the slide rail 704. There is only one electric regulator 17 installed on the automatic fiber changer 7, which is installed on the rotating top surface of the second rotating table 703 and fixed to the bottom of the rotating knob through a fixing bracket. Refer to Figure 9 The second rotating disk 702 is in the shape of a quarter disk. Eight optical fiber through holes 7022 are evenly arranged along the periphery of the quarter circular edge 7021. Two optical fiber clip mounting holes 7023 are arranged beside each optical fiber through hole 7022. Eight optical fiber fixing clips 701 are respectively installed on one side at the positions of the eight optical fiber through holes 7022. Each of the eight optical fiber fixing clips 701 clamps an optical fiber 9. The clamping position is the neck of the optical fiber 9 where it exits the optical head. The other side of the second rotating disk 702 where the optical fiber fixing clips 701 are installed is installed on the rotating top surface of the second rotating table 703. The rotation center 7024 of the second rotating disk 702 is coaxial with the rotation axis of the second rotating table 703. The included angle between the two outermost ones among the eight optical fiber through holes 7022 opened on the second rotating disk 702 and the connection line of the rotation center 7024 of the second rotating disk 702 is 90 degrees. The servo fixing bracket 709 is fixed on one side of the slide rail 704 away from the second rotating table 703. The servo 7010 is fixed on the servo fixing bracket 709. The output shaft of the servo 7010 is perpendicular to the top surface of the sliding table 705. The cam 708 is installed on the output shaft of the servo 7010. The sliding table 705 and the servo fixing bracket 709 are connected by two second tension springs 707, so that there is always an elastic tension between the two, so that the cam 708 is always in contact with the sliding table 705.

[0086] Refer to Figure 5 The optical fiber fixing clip 701 includes: a torsion spring 7011 for clamping the upper clip 7012 and the lower clip 7013 to each other, an upper clip 7012 for clamping the optical fiber 9, and a lower clip 7013.

[0087] Two fixing holes for fixing to the second rotating disk 702 are opened on one side of the lower clip 7013, which are fitted and installed with the optical fiber clip mounting holes 7023. The clamping hole formed after the upper clip 7012 and the lower clip 7013 are assembled is a cylindrical hole with a chamfer. The inner diameter of the clamping hole is slightly smaller than the diameter of the neck of the optical fiber 9 where it exits the optical head. The chamfer opened on the clamping hole is 15 degrees. The torsion spring 7011 is installed on the inner sides of the legs of the upper clip 7012 and the lower clip 7013.

[0088] Embodiment 4

[0089] Refer to Figure 6, the automatic collimator 6 that can be used in the above-mentioned Embodiment 1 includes: a stepper motor 601 with a reducer for driving the fiber collimator 605 to achieve autofocus, a fiber rotator 602 for fixing the fiber output head of the optical fiber 9 to the fiber collimator 605 or removing it from the fiber collimator 605, a rotator fixing plate 603 for fixing the fiber rotator 602 to the collimator cage mounting bracket 604, a fiber collimator 605 for collimating the divergent light emitted by the optical fiber 9, a collimator cage mounting bracket 604 for fixing the stepper motor 601 with a reducer and the fiber collimator 605, and a cage adapter plate 606 for connecting and fixing the collimator cage mounting bracket 604 and the 45-degree cage mirror bracket 1601 with a 6-mm-diameter stainless steel rod;

[0090] Specifically, both the stepper motor 601 with a reducer and the fiber collimator 605 are mounted on the collimator cage mounting bracket 604. A gear is mounted on the output shaft of the stepper motor 601 with a reducer and meshes with the gear on the fiber collimator 605. The fiber rotator 602 is fixed to the front end of the fiber collimator 605 through the rotator fixing plate 603. A through hole with a diameter slightly larger than the outer diameter of the lens mounting cylinder 6054 is provided in the middle of the cage adapter plate 606.

[0091] See Figure 7 , the fiber rotator 602 includes: a fixing plate 6021 for mounting a micro-rotating rod 6023, a gear 6025, and a motor fixing bracket 6027, a micro-extension rod 6022 that can be telescoped in the micro-rotating rod 6023, a micro-rotating rod 6023 for driving an elastic friction rod 6024, an elastic friction rod 6024 that can drive the SMA threaded head of the fiber output head of the optical fiber 9 to rotate clockwise or counterclockwise, a gear 6025 for transmitting the rotational output of the micro-stepper motor 6026 to the micro-rotating rod 6023, a micro-stepper motor 6026 for driving the gear 6025 to rotate, and a motor fixing bracket 6027 for fixing the micro-stepper motor 6026 to the fixing plate 6021;

[0092] Specifically, the fixing plate 6021 is a square plate with a through hole in the middle, and the diameter of the through hole is slightly larger than the diameter of the SMA threaded head of the optical fiber 9 exiting the optical head. On one side of the fixing plate 6021, a micro stepping motor 6026 with a gear on its output shaft and two gears 6025 are installed. The two gears 6025 are located on the upper and lower sides of the micro stepping motor 6026 and mesh with the gear installed on the output shaft of the micro stepping motor 6026. The micro stepping motor 6026 is fixed to the fixing plate 6021 through a motor fixing bracket 6027. On the other side of the fixing plate 6021, a set of multi-link mechanisms are symmetrically installed above and below the through hole. The multi-link mechanism is composed of two micro rotating rods 6023, two micro telescopic rods 6022, and an elastic friction rod 6024. In a set of the multi-link mechanisms, one side of the micro rotating rod 6023 is connected to a gear 6025 installed on the back of the fixing plate 6021, and the two rotate together. The other side of the micro rotating rod 6023 is driven to rotate passively. The micro telescopic rod 6022 is inserted into the micro rotating rod 6023, and a thrust spring is provided inside the micro rotating rod 6023, so that there is always an elastic thrust when the micro telescopic rod 6022 expands and contracts inside the micro rotating rod 6023. The elastic friction rod 6024 is a cuboid, and a serrated rubber pad is pasted on its lower part. Hinges are provided at both ends of the elastic friction rod 6024 and are connected to the ends of the micro telescopic rods 6022, and the two can rotate relative to each other at the position of the hinge. The SMA threaded head of the optical fiber 9 exiting the optical head passes through the through hole opened on the fixing plate 6021 and is clamped by the two elastic friction rods 6024.

[0093] See Figure 8 , the optical fiber collimator 605 includes: a gear threaded cylinder 6051 that drives the lens mounting cylinder 6054 to move left and right, a collimating lens 6052 that collimates the divergent light emitted by the optical fiber 9, a lens retaining ring 6053 for fixing the collimating lens 6052, and a lens mounting cylinder 6054 for mounting and fixing the collimating lens 6052;

[0094] Specifically, on one side of the collimator cage mount 604, there is a square hole for installing the deceleration stepper motor 601, and on the other side, there is an SMA threaded post for fixing the optical fiber output head. Coaxially on the back of the SMA threaded post for fixing the output head of the optical fiber 9, there is a cylinder with a fine-pitch right-handed external thread. The lens mounting cylinder 6054 is cylindrical. On one side, there is a groove for installing the collimating lens 6052, and on the outer surface of the other side, there is a fine-pitch left-handed external thread. The gear threaded cylinder 6051 is a cylindrical structure with a gear on its outer surface. In the first half of its inner surface, there is a fine-pitch right-handed internal thread, which mates with the fine-pitch right-handed external thread on the collimator cage mount 604. In the second half, there is a fine-pitch left-handed internal thread, which meshes with the fine-pitch left-handed external thread on the lens mounting cylinder 6054. The fiber collimator 605 is coaxial with the through hole opened in the middle of the fixing plate 6021. On the outside of the cylinder with the fine-pitch right-handed external thread on the collimator cage mount 604, there is a sliding groove that mates with the inner side of the lens mounting cylinder 6054, enabling only left-right sliding movement between the two.

[0095] Since the cylinder on the collimator cage mount 604 has a fine-pitch right-handed external thread, the outer surface of the lens mounting cylinder 6054 has a fine-pitch left-handed external thread, the first half of the inner surface of the gear threaded cylinder 6051 has a fine-pitch right-handed internal thread that mates with the right-handed external thread on the collimator cage mount 604, the second half has a fine-pitch left-handed internal thread that mates with the left-handed external thread on the lens mounting cylinder 6054, and on the outside of the cylinder with the fine-pitch right-handed external thread on the collimator cage mount 604, there is a sliding groove that mates with the inner side of the lens mounting cylinder 6054. Therefore, when the deceleration stepper motor 601 rotates clockwise, the lens mounting cylinder 6054 will drive the collimating lens 6052 away from the collimator cage mount 604, and when the deceleration stepper motor 601 rotates counterclockwise, the collimating lens 6052 will approach the collimator cage mount 604.

[0096] Embodiment 5

[0097] See Figure 6 , the automatic beam splitter 16 that can be used in the above Embodiment 1 includes: a 45-degree cage mirror mount 1601 with a second beam splitter installed, a 45-degree motor mount 1602 for fixing the electric regulator 17 to the 45-degree cage mirror mount 1601, and an electric regulator 17 for controlling the automatic rotation of the knob on the 45-degree cage mirror mount 1601;

[0098] Specifically, a second beam splitter with a transmittance of 10% is installed inside the 45-degree cage mirror mount 1601. The 45-degree cage mirror mount 1601 is connected and fixed to the collimator cage mount 604 by four stainless steel rods with a diameter of six millimeters. There are two electric regulators 17 installed on the automatic beam splitter 16, which are respectively installed on the two adjustment knobs of the 45-degree cage mirror mount 1601, and are both fixed to the 45-degree cage mirror mount 1601 through the 45-degree motor mount 1602. The two electric regulators 17 are used to adjust the deflection angle of the second beam splitter. The initial angle between the second beam splitter and the collimated light beam is 45 degrees. The 45-degree cage mirror mount is a standard cage mirror mount. The electric regulator controls the rotation of two knobs on the 45-degree cage mirror mount, so that the angle of the second beam splitter deflects slightly above and below 45 degrees, such as 45 ± 2°. The outer end of the optical arm 5 installed on the right side of the fluorescence cell 2 is connected and fixed to the 45-degree cage mirror mount 1601 by four stainless steel rods with a diameter of six millimeters.

[0099] Example 6

[0100] See Figure 2 , the electric regulator 17 that can be used in the above embodiments includes: a magnet 1701 that attracts the replaceable joint 1703, an elastic coupling 1702 that connects the micro-decelerating stepper motor 1707 and the joint sleeve 1704, a replaceable joint 1703 that drives the rotation of the inner hexagon screw at the center of the optical mechanical part knob, a joint sleeve 1704 that drives the rotation of the replaceable joint 1703, an outer shell 1705 that fixes the electric regulator 17 to the optical mechanical part, an inner shell 1706 that fixes the micro-decelerating stepper motor 1707 and allows the micro-decelerating stepper motor 1707 to slide up and down relative to the outer shell 1705, a micro-decelerating stepper motor 1707 that drives the rotation of the replaceable joint 1703, and a first tension spring 1708 that generates an elastic tensile force between the outer shell 1705 and the inner shell 1706.

[0101] Specifically, the replaceable joint 1703 is a replaceable external hexagonal head, and the joint sleeve 1704 is an internal hexagonal sleeve. The outer shell 1705 is cylindrical, and two through holes for fixing to the optical mechanical parts are provided on both sides of its upper end, and a through hole for passing the replaceable joint 1703 is provided in the center of its upper end. The inner shell 1706 is cylindrical and is sleeved inside the outer shell 1705. The inner side of the outer shell 1705 is provided with a sliding groove that matches the outer side of the inner shell 1706, so that only up and down sliding movement can occur between the two. The outer shell 1705 and the inner shell 1706 are also connected by two No. 1 tension springs 1708, so that there is always elastic tension between the two. The micro-reduction stepper motor 1707 is installed on the lower bottom surface of the inner shell 1706, and the replaceable joint 1703 is connected to the output shaft of the micro-reduction stepper motor 1707 through the joint sleeve 1704 and the elastic coupling 1702 in sequence. The replaceable joint 1703 is magnetic and is adsorbed on the joint sleeve 1704 through the magnet 1701.

[0102] The working principle of the electric adjuster 17 is as follows: the replaceable joint 1703 is replaced with a model suitable for the manual optical mechanical part to be installed, and the outer shell 1705 is fixed to the knob or handle of the manual optical mechanical part through a fixing frame (a simple adapter mounting frame designed according to the standard knob or handle of the manual optical mechanical part, and the specific size structure changes with the model of the manual optical mechanical part), and the center of the replaceable joint 1703 is made roughly coaxial with the center of the knob or handle of the manual optical mechanical part, and the inner shell 1706 on which the micro-reduction stepper motor 1707 is installed is pulled to move the replaceable joint 1703 away from the knob or handle. After loosening, due to the elastic tension, the replaceable joint 1703 is inserted into the hexagonal hole in the center of the knob or handle, and the micro-reduction stepper motor 1707 can drive the knob or handle of the manual optical mechanical part to rotate. Since the micro-reduction stepper motor 1707 and the knob or handle are driven by the elastic coupling 1702, the replaceable joint 1703 can be driven normally without accurately aligning the replaceable joint 1703 to the center of the knob or handle. Since the electric regulator 17 is driven by a stepper motor, and the original knob or handle is still exposed when the electric regulator 17 is installed on the manual optical mechanical part, the knob or handle on the manual optical mechanical part is self-locked when the micro-reduction stepper motor 1707 is powered on, and the knob or handle on the manual optical mechanical part can still be manually rotated when the micro-reduction stepper motor 1707 is powered off.

[0103] Example 7

[0104] The detection device provided in the above-mentioned embodiments 1-6 is used to measure the concentration of the active intermediate, and the optical fiber can be automatically replaced and adjusted in real time, so that the coupling, alignment and coaxiality of the optical fiber are always maintained in the best stable state, as shown below:

[0105] The method for the detection device to measure the concentration of reactive intermediates is as follows:

[0106] The vacuum pump evacuates the fluorescence cell 2 to a low pressure. The ambient air carrying the reactive intermediates is inhaled from the sampling nozzle 1 and sprayed into the fluorescence cell 2. The laser emitted by the laser 12 passes through the first beam splitter 13 and the coupling lens 1004 and is focused into the input head of the optical fiber 9. After propagating in the optical fiber 9, the laser exits from the output head of the optical fiber 9. The divergent laser beam after exiting is collimated into a collimated laser beam by the collimating lens 6052. The collimated beam enters the fluorescence cell 2 through the window of the right optical arm 5 and intersects with the reactive intermediates to generate fluorescence. The photomultiplier tube installed at the rear of the fluorescence cell 2 converts the fluorescence signal into an electrical signal S and transmits it to the industrial control computer 14. During this period, the signal received by the industrial control computer 14 from the first energy meter 3 is P. A gas with a known concentration c' generated by the standard source is passed near the sampling nozzle 1, and in the same principle as above, the electrical signal s' can be measured. During this period, the signal received by the industrial control computer 14 from the first energy meter 3 is p'. Then, according to the formula, the concentration C of the reactive intermediates in the ambient air is calculated as:

[0107]

[0108] The method for the detection device to automatically replace the optical fiber includes the following steps:

[0109] S11: When the third laser energy detected by the third energy meter 15 is less than 1 / 4 of the first laser energy detected by the second energy meter 11, the electric regulator 17 drives the first rotating disk 1007 equipped with eight optical fiber input heads to quickly rotate 45 degrees, so that the next new optical fiber is roughly coaxial with the coupling lens 1004.

[0110] S12: The micro stepping motor 6026 on the optical fiber rotator 602 rotates counterclockwise, driving the elastic friction rod 6024 above to move to the left and the elastic friction rod 6024 below to move to the right, thereby rotating the SMA threaded head of the output head of the optical fiber 9 clamped between the two elastic friction rods 6024 counterclockwise until it is unscrewed from the SMA threaded post on the collimator cage mount 604. Figure 7

[0111] Figure 4 S13: The servo 7010 rotates 90 degrees to make the slide 705 drive the fixed clamp 701 installed on the second rotating disk 702 to move in the reverse direction of the X-axis as shown, so that the optical fiber fixed clamp 701 squeezes and clamps the neck of the output head of the optical fiber by means of the 15-degree chamfer opened on the internal cylindrical hole. The servo 7010 rotates 90 degrees again to make the slide 705 drive the second rotating disk 702 with the optical fiber fixed clamp 701 fixed to move in the forward direction of the X-axis as shown, so that the output head of the optical fiber 9 clamped by the optical fiber fixed clamp 701 is separated from the optical fiber rotator 602. Figure 4 ​​​

[0112] S14: The electric regulator 17 drives the optical fiber light outlet mounted on the second rotating disk 702 to rotate 12.86 degrees, so that the light outlet of the next new optical fiber is coaxial with the SMA threaded column on the collimator cage mounting frame 604.

[0113] S15: The steering gear 7010 rotates 90 degrees again to make the slide 705 drive the optical fiber head installed on the second rotating disk 702 to move along Figure 4 The X-axis is shown moving in the opposite direction, and the optical fiber light outlet head is inserted into the SMA threaded column on the collimator cage mounting frame 604 through the optical fiber screw holder 602.

[0114] S16: The micro-stepping motor 6026 on the optical fiber fixer 602 rotates clockwise, driving the Figure 7 The upper elastic friction rod 6024 moves to the right, and the lower elastic friction rod 6024 moves to the left, thereby rotating the SMA threaded head of the optical fiber 9 output head clamped between the two elastic friction rods 6024 clockwise until the SMA threaded head of the optical fiber 9 output head is tightened onto the SMA threaded column on the collimator cage mounting frame 604.

[0115] S17: The steering gear 7010 rotates 90 degrees again to make the slide 705 drive the optical fiber head installed on the second rotating disk 702 to move along Figure 4 The X-axis moves in the positive direction, so that the optical fiber is separated from the optical fiber fixing clamp 701. At this point, the optical fiber replacement is completed.

[0116] The method for automatically coupling optical fibers by a detection device comprises the following steps:

[0117] S21: The three electric regulators 17 on the optical fiber automatic coupler 10 first drive the optical fiber 9 into the optical head. Figure 3 The X-axis and Z-axis move slowly in the positive or reverse direction until the energy measured by the third energy meter 15 reaches the maximum.

[0118] S22, then drives the optical fiber 9 into the optical head edge Figure 3 The Y axis shown moves slowly in the positive or negative direction until the energy measured by the third energy meter 15 reaches the maximum.

[0119] Repeat the process of S21-S22 twice, and the coupling adjustment of the new optical fiber is completed.

[0120] The method for automatically aligning and coaxially adjusting an optical fiber by a detection device comprises the following steps:

[0121] S31: Automatically adjust the two electric regulators 17 on the beam splitter 16 to drive the second beam splitter installed on the 45-degree cage mirror mount 1601 to deflect significantly, causing the first laser beam emitted from the sampling measurement module to move significantly up, down, left, and right. When the first laser beam is just completely blocked by the aperture 4, the energy monitored by the first energy meter 3 will be close to zero. The industrial control computer 14 respectively records the coordinate points where the first laser beam just becomes close to zero after moving in the four directions, and records them as boundary points, including four boundary points: up, down, left, and right. With the initial position as the origin, when the electric regulator 17 controls the first knob to rotate forward, the light beam can be deflected upward, and when the first knob is rotated backward, the light beam is deflected downward. Similarly, by controlling the forward and backward rotation of the second knob of the electric regulator 17, the light beam can be deflected left and right. When the laser beam deflects excessively up, down, left, and right, the first laser beam cannot pass through the small hole in the aperture 4, that is, it is completely blocked by the aperture 4. Among them, when deflecting upward excessively and the first laser beam just cannot pass through the aperture 4, it is recorded as the upper boundary point, and the same applies to the remaining three boundary points. The designed diameter of the small hole in the aperture 4 is the same as the diameter of the collimated laser beam. Through this adjustment process, a point can be found where the laser beam just completely passes through the small hole in the aperture 4. Specifically, by recording the number of turns of the forward and backward rotation of the micro-decelerating stepping motor 1707 on the electric regulator 17, and taking the position before adjustment, that is, the initial position, as the coordinate origin, the coordinates of the four points can be calculated inversely. First, with the coordinate origin as the origin, move significantly left and right to obtain the coordinates of the two left and right boundary points, and then take the midpoint of these two left and right boundary points as the origin and move significantly up and down to obtain the coordinates of the two upper and lower boundary points. Then, when the light beam is adjusted to the midpoint position of the two upper and lower boundary points, the light beam output from the automatic beam splitter (16) is approximately coaxial with the optical arm 5.

[0122] S32: When the decelerating stepping motor 601 rotates slowly clockwise, if the energy on the first energy meter 3 remains unchanged, record the energy at this time as Pmax, and then rotate counterclockwise until the measured energy begins to slowly decrease, and then rotate clockwise slowly until the measured energy just becomes Pmax and stop.

[0123] When the decelerating stepping motor 601 rotates slowly clockwise, if the energy on the first energy meter 3 slowly decreases, then rotate counterclockwise until the measured energy begins to remain unchanged, and then rotate clockwise slowly until the measured energy just begins to slowly decrease and stop.

[0124] When the decelerating stepping motor 601 rotates slowly clockwise, if the energy on the first energy meter 3 slowly increases, then keep the decelerating stepping motor 601 rotating clockwise until the energy begins to remain unchanged, and then rotate the decelerating stepping motor 601 counterclockwise until the energy just begins to decrease and stop.

[0125] At this time, the light beam becomes approximately a collimated light beam.

[0126] S33: Repeat the processes of S31 and S32 twice. At this time, the light beam becomes a collimated beam with a diameter consistent with the aperture of the diaphragm 4 and is coaxial with the optical arm 5.

[0127] The device of the present invention performs real-time correction on the states of fiber optic coupling, collimation, and coaxiality, and the steps are as follows:

[0128] S41: Execute steps S21 - S22 once to complete the optimization of fiber optic coupling.

[0129] S42: Execute steps S31 - S32 once to complete the adjustment of fiber optic collimation and coaxiality.

[0130] Execute the above process once every 12 hours to achieve real-time correction of the states of fiber optic coupling, collimation, and coaxiality.

[0131] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gas expansion laser-induced fluorescence detection device with self-adjusting optical path, characterized in that, The detection device includes: a light source module, N optical fibers (9), an optical fiber automatic coupler (10), an automatic optical fiber changer (7), an automatic collimator (6), an automatic beam splitter (16), a sampling measurement module, and a monitoring and control system; The light source module is used to emit a laser that causes the active intermediate to produce fluorescence; The optical fiber automatic coupler (10) is fixed with the input heads of N optical fibers (9), and is used to selectively couple the laser emitted by the light source module into a certain optical fiber (9). This optical fiber (9) serves as the transmission optical fiber and is used to conduct the laser into the sampling measurement module; The automatic optical fiber changer (7) is fixed with the neck of the output head of N optical fibers (9), and is used to selectively input the output head of the transmission optical fiber into the automatic collimator (6); The automatic collimator (6) is used to fix the output head of the transmission optical fiber and adjust the collimation distance of the transmission optical fiber to output a collimated beam; The automatic beam splitter (16) is used to coaxially adjust the collimated beam output from the automatic collimator (6) into the sampling measurement module; The sampling measurement module is a place where the collimated beam intersects with the active intermediate to produce fluorescence, and collects the fluorescence signal; The monitoring and control system is used to monitor the energy of the laser at various locations in the detection device, control the operation of the optical fiber automatic coupler (10), the automatic optical fiber changer (7), the automatic collimator (6), and the automatic beam splitter (16), and at the same time perform calculation and processing on the fluorescence signal output by the sampling measurement module, and finally obtain the real-time concentration data of the active intermediate.

2. The gas expansion laser-induced fluorescence detection device with self-adjusting optical path according to claim 1, wherein The optical fiber automatic coupler (10) includes: an optical flat plate (1001) for fixing the components on the optical fiber automatic coupler (10), a two-dimensional translation stage (1002) for moving the input head of the optical fiber (9) back and forth, left and right, a lens holder (1003) for fixing the coupling lens (1004), a coupling lens (1004) for focusing and coupling the laser emitted by the light source module into the input head of the optical fiber (9), a first fixing frame (1005) for fixing the first rotating stage (1006) to the two-dimensional translation stage (1002), a first rotating stage (1006) for rotating the input head of the optical fiber (9) around the center of the first rotating stage (1006), a first rotating disk (1007) for increasing the rotation radius of the first rotating stage (1006) and fixing the input head of the optical fiber (9), and an electric regulator (17) for controlling the automatic rotation of the knob; The two-dimensional translation stage (1002) and the lens bracket (1003) are fixed on the optical flat plate (1001). The first rotary stage (1006) is fixed on the translation top surface of the two-dimensional translation stage (1002) through the first fixing bracket (1005). The rotary top surface of the first rotary stage (1006) is perpendicular to the translation top surface of the two-dimensional translation stage (1002). The electric regulator (17) is installed on the knobs for adjusting the front-back translation and left-right translation of the translation stage on the two-dimensional translation stage (1002), and the electric regulator (17) is also installed on the knobs for adjusting the rotation of the rotary stage on the first rotary stage (1006). N SMA threaded posts for installing the fiber (9) into the optical head are provided on the periphery of one side of the first rotary disk (1007), and a fiber (9) is installed on each SMA threaded post. The other side of the first rotary disk (1007) is coaxially installed on the rotary top surface of the first rotary stage (1006). The coupling lens (1004) is installed on the lens bracket (1003), and the coupling lens (1004) is coaxial with a certain fiber (9) installed on the first rotary disk (1007).

3. The gas expansion laser-induced fluorescence detection device with self-adjusting optical path according to claim 1, characterized in that, The automatic fiber changer (7) includes: a fiber fixing clip (701) for clamping the neck of the fiber (9) out of the optical head, a second rotary disk (702) for installing the fiber fixing clip (701), a second rotary stage (703) for driving the second rotary disk (702) to rotate, a slide table (705) for driving the fiber (9) out of the optical head to move back and forth, a slide rail (704) for enabling the slide table (705) to move linearly back and forth, a second fixing bracket (706) for fixing the second rotary stage (703) to the slide table (705), a cam (708) for pushing the slide table (705) to move back and forth, a servo motor (7010) for driving the cam (708) to rotate, a servo motor fixing bracket (709) for installing and fixing the servo motor (7010), a second tension spring (707) for generating an elastic tension between the slide table (705) and the servo motor fixing bracket (709), and an electric regulator (17) for controlling the automatic rotation of the knob; The sliding table (705) is fitted and installed on the slide rail (704). The second rotating table (703) is fixed on the top surface of the sliding table (705) through the second fixing bracket (706). The rotating top surface of the second rotating table (703) is perpendicular to the top surface of the slide rail (704). The electric regulator (17) is installed on the knob for adjusting the rotation of the rotating table on the second rotating table (703). N through holes are provided on the periphery of the second rotating disk (702). On one side of the second rotating disk (702), optical fiber fixing clips (701) are respectively installed at each through hole. A fiber optic cable (9) is clamped on each optical fiber fixing clip (701), and the clamping position is the neck of the fiber optic cable (9) where it exits the optical head. The other side of the second rotating disk (702) is installed on the rotating top surface of the second rotating table (703). The servo fixing bracket (709) is fixed on one side of the slide rail (704) away from the second rotating table (703). The servo (7010) is fixed on the servo fixing bracket (709). The output shaft of the servo (7010) is perpendicular to the top surface of the sliding table (705). The cam (708) is installed on the output shaft of the servo (7010). The sliding table (705) and the servo fixing bracket (709) are connected by a second tension spring (707), so that there is always an elastic tension between the two, so that the cam (708) is always in contact with the sliding table (705).

4. An optical path self-adjusting gas expansion laser-induced fluorescence detection device according to claim 3, characterized in that, The optical fiber fixing clip (701) includes: an upper clip (7012) and a lower clip (7013) for clamping the optical fiber (9), and a torsion spring (7011) for making the upper clip (7012) and the lower clip (7013) clamp each other; On one side of the lower clip (7013), two fixing holes for fixing to the second rotating disk (702) are provided. The clamping hole formed after the upper clip (7012) and the lower clip (7013) are assembled is a cylindrical hole with a chamfer. The inner diameter of the clamping hole is smaller than the diameter of the neck of the optical fiber (9) where it exits the optical head. The torsion spring (7011) is installed inside the legs of the upper clip (7012) and the lower clip (7013).

5. An optical path self-adjusting gas expansion laser-induced fluorescence detection device according to claim 1, characterized in that, The automatic collimator (6) includes: an optical fiber collimator (605) for collimating the divergent light emitted by the optical fiber (9), an optical fiber rotator (602) for fixing or removing the optical head of the optical fiber (9) to / from the optical fiber collimator (605), and a stepper motor with reducer (601) for driving the optical fiber collimator (605) to achieve automatic focusing; A gear is installed on the output shaft of the stepper motor with reducer (601), which meshes with the gear on the optical fiber collimator (605). The optical fiber collimator (605) is installed in the collimator cage mounting bracket (604).

6. The gas expansion laser-induced fluorescence detection device with self-adjusting optical path according to claim 5, characterized in that, The optical fiber rotator (602) includes: a fixing plate (6021) for mounting a micro-rotating rod (6023), a gear (6025), and a motor fixing bracket (6027); a micro-expanding rod (6022) that can expand and contract within the micro-rotating rod (6023); a micro-rotating rod (6023) that drives the elastic friction rod (6024) to move; an elastic friction rod (6024) that can drive the SMA threaded head of the optical fiber (9) out of the optical head to rotate clockwise or counterclockwise; a gear (6025) that transmits the rotational output of the micro-step motor (6026) to the micro-rotating rod (6023); a micro-step motor (6026) that drives the gear (6025) to rotate; and a motor fixing bracket (6027) that fixes the micro-step motor (6026) to the fixing plate (6021). A through hole is formed in the fixing plate (6021), and the diameter of the through hole is larger than the diameter of the SMA threaded head of the optical fiber (9) out of the optical head. On one side of the fixing plate (6021), a micro-step motor (6026) with a gear on its output shaft and two gears (6025) are mounted. The two gears (6025) are located on the upper and lower sides of the micro-step motor (6026) and mesh with the gear on the output shaft of the micro-step motor (6026). The micro-step motor (6026) is fixed to the fixing plate (6021) through the motor fixing bracket (6027). On the other side of the fixing plate (6021), a set of multi-link mechanisms are symmetrically mounted above and below the through hole. The multi-link mechanism is composed of two micro-rotating rods (6023), two micro-expanding rods (6022), and an elastic friction rod (6024). In a set of multi-link mechanisms, one of the micro-rotating rods (6023) is connected to a gear (6025) mounted on the back of the fixing plate (6021), and the two rotate together. The other micro-rotating rod (6023) rotates passively. The micro-expanding rod (6022) is inserted into the micro-rotating rod (6023), and a thrust spring is provided in the micro-rotating rod (6023) so that there is always an elastic thrust when the micro-expanding rod (6022) expands and contracts within the micro-rotating rod (6023). A serrated rubber pad is pasted on the lower part of the elastic friction rod (6024). Hinges are provided at both ends of the elastic friction rod (6024) and are connected to the ends of the micro-expanding rod (6022), and the two can rotate relative to each other at the position of the hinge. The SMA threaded head of the optical fiber (9) out of the optical head passes through the through hole formed in the fixing plate (6021) and is clamped by the two elastic friction rods (6024).

7. An optically self-adjusting gas expansion laser-induced fluorescence detection device according to claim 5, wherein, The optical fiber collimator (605) includes: a gear threaded cylinder (6051) that drives the lens mounting cylinder (6054) to move left and right, a collimating lens (6052) that collimates the divergent light emitted by the optical fiber (9), a lens retaining ring (6053) for fixing the collimating lens (6052), and a lens mounting cylinder (6054) for mounting and fixing the collimating lens (6052); The collimator cage mount (604) is provided with an SMA threaded post for fixing the output head of the optical fiber (9). A cylinder with a fine pitch right-handed external thread is coaxially provided on the back of the SMA threaded post. One side of the lens mounting cylinder (6054) is provided with a groove for mounting the collimating lens (6052), and the other side is provided with a fine pitch left-handed external thread. The gear threaded cylinder (6051) is a cylindrical structure with gears on its outer surface. The first half of its inner surface is provided with a fine pitch right-handed internal thread, which meshes with the fine pitch right-handed external thread of the cylinder on the collimator cage mount (604). The second half is provided with a fine pitch left-handed internal thread, which meshes with the fine pitch left-handed external thread on the lens mounting cylinder (6054). A chute that matches the inner side of the lens mounting cylinder (6054) is provided on the outside of the cylinder with a fine pitch right-handed external thread on the collimator cage mount (604), enabling a left and right sliding movement between the two.

8. An optically self-adjusting gas expansion laser-induced fluorescence detection device according to claim 5, characterized in that, The automatic adjustment beam splitter (16) includes: a 45-degree cage mirror mount (1601), an electric regulator (17) that controls the automatic rotation of the knob on the 45-degree cage mirror mount (1601), and a 45-degree motor mount (1602) that fixes the electric regulator (17) to the 45-degree cage mirror mount (1601); A second beam splitter is installed inside the 45-degree cage mirror mount (1601). The second beam splitter is used to split the collimated light beam output from the automatic adjustment collimator (6). The 45-degree cage mirror mount (1601) is connected to the collimator cage mount (604). There are two electric regulators (17) installed on the automatic adjustment beam splitter (16), which are respectively installed on the two adjustment knobs of the 45-degree cage mirror mount (1601) and are used to adjust the deflection angle of the second beam splitter. Both are fixed to the 45-degree cage mirror mount (1601) through the 45-degree motor mount (1602).

9. An optical path self-adjusting gas expansion laser-induced fluorescence detection device according to claim 2 or 3 or 8, characterized in that, The electric regulator (17) includes: a replaceable joint (1703) for driving the rotation of the optical mechanical part knob, a joint sleeve (1704) for driving the rotation of the replaceable joint (1703), a micro reduction stepping motor (1707) for driving the rotation of the joint sleeve (1704), an elastic coupling (1702) for connecting the micro reduction stepping motor (1707) and the joint sleeve (1704), a jacket housing (1705) for fixing the electric regulator (17) to the optical mechanical part, an inner housing (1706) for the micro reduction stepping motor (1707) and enabling the micro reduction stepping motor (1707) to slide up and down relative to the jacket housing (1705), and a first tension spring (1708) for generating an elastic tensile force between the jacket housing (1705) and the inner housing (1706).

10. The gas expansion laser-induced fluorescence detection device with self-adjusting optical path according to claim 1, wherein The light source module includes: a laser (12) that emits laser light capable of causing the active intermediate to fluoresce and a first beam splitter (13); the first beam splitter (13) is used for splitting the laser light emitted by the laser (12).

11. The gas expansion laser-induced fluorescence detection device with self-adjusting optical path according to claim 1, characterized in that, The sampling and measurement module includes: a fluorescence cell (2) where the collimated beam and the sampling air flow intersect to generate fluorescence, a sampling nozzle (1) that causes the ambient air carrying the active intermediate to form a high-speed jet, and a light arm (5) that reduces stray light around the collimated beam; The sampling nozzle (1) is a conical structure with a small hole opened at the top. The sampling nozzle (1) is located above the fluorescence cell (2) and the cone tip is away from the fluorescence cell (2); Light arms (5) are installed on both the left and right sides of the fluorescence cell (2), and a vacuum pump is connected below the fluorescence cell (2); Among them, the collimated beam output from the automatic collimator (6) enters the fluorescence cell (2) through the light arm (5) on the right side. After the collimated beam intersects with the active intermediate in the fluorescence cell (2) to generate fluorescence, it then exits from the light arm (5) on the left side; A window sheet for sealing the cavity and transmitting laser light is installed at the outer end of the light arm (5), that is, the end away from the fluorescence cell (2), and multiple conical diaphragms are installed inside the light arm (5); A photomultiplier tube is installed on the back of the fluorescence cell (2).

12. The gas expansion laser-induced fluorescence detection device with self-adjusting optical path according to claim 1, wherein The monitoring and control system includes: a first energy meter (3) for monitoring the first laser energy emitted from the sampling and measurement module, a second energy meter (11) for monitoring the second laser energy emitted from the light source module, a third energy meter (15) for monitoring the third laser energy emitted from the automatic collimator (6), a single-chip microcomputer (8) and an industrial control computer (14); The single-chip microcomputer (8) is used to control the rotation of all motors in the detection device; The industrial control computer (14) is used to receive the energy signals of each energy meter and receive the fluorescence signal, and control the operation of the single-chip microcomputer (8).

13. A method for detecting gas expansion laser-induced fluorescence with self-adjusting optical path, characterized in that, For an optical path self-adjusting gas expansion laser-induced fluorescence detection device applicable to the above-mentioned claim 4, the method for automatic fiber replacement includes the following steps: S11. The monitoring and control system monitors the first laser energy emitted from the sampling measurement module, the second laser energy emitted from the light source module, and the third laser energy emitted from the automatic collimator (6). When the third laser energy is less than 1 / 4 of the second laser energy, the next optical fiber (9) is selected as the new transmission optical fiber through the optical fiber automatic coupler (10). S12. The automatic collimator (6) disassembles the light output head of the currently fixed old transmission optical fiber. S13. The servo motor (7010) of the automatic optical fiber changer (7) rotates, causing the slide table (705) to drive the optical fiber clamp (701) on the second rotating disk (702) to move closer to the automatic collimator (6), so that the optical fiber clamp (701) squeezes and clamps the neck of the light output head of the old transmission optical fiber through the clamping hole with a chamfer on the cylindrical hole. The servo motor (7010) rotates again, causing the slide table (705) to drive the second rotating disk (702) to move away from the automatic collimator (6), so that the old transmission optical fiber clamped by the optical fiber clamp (701) is detached from the optical fiber rotator (602). S14. Rotate the second rotating disk (702) of the automatic optical fiber changer (7) to align the light output head of the new transmission optical fiber with the input end of the automatic collimator (6). S15. The servo motor (7010) of the automatic optical fiber changer (7) rotates, causing the slide table (705) to drive the light output head of the new transmission optical fiber on the second rotating disk (702) to move closer to the automatic collimator (6), and insert the light output head of the new transmission optical fiber into the automatic collimator (6). S16. The automatic collimator (6) fixes the light output head of the new transmission optical fiber. S17. The servo motor (7010) of the automatic optical fiber changer (7) rotates, causing the slide table (705) to drive the second rotating disk (702) to move away from the automatic collimator (6), so that the light output head of the new transmission optical fiber is detached from the optical fiber clamp (701).

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