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

Abstract

The invention discloses a light path self-adjusting gas expansion laser-induced fluorescence detection device and method, and relates to the technical fields of optics, automatic control, atmospheric environment monitoring and the like. A light inlet head of N optical fibers is fixed on an optical fiber automatic coupler, and laser emitted by a light source module is selected to be coupled into a certain optical fiber; the optical fiber is used as a transmission optical fiber and transmits the laser into the sampling measurement module; the automatic optical fiber replacing device is fixedly provided with the light-emitting head necks of N optical fibers, and the light-emitting head of the transmission optical fiber is selected to be input into the automatic adjusting collimator; the automatic adjusting collimator is used for fixing a light emitting head of the transmission optical fiber and adjusting the collimation distance of the transmission optical fiber so as to output a collimated light beam; the automatic adjusting beam splitter is used for coaxially adjusting the collimated light beam output from the automatic adjusting collimator into the sampling measurement module; the sampling and measuring module is a place where the collimated light beam and the active intermediate intersect to generate fluorescence, and is used for collecting a fluorescence signal; the monitoring control system is used for monitoring the energy of the laser in each part of the detection device, controlling the operation of the optical fiber automatic coupler, the automatic optical fiber changer, the automatic adjusting collimator and the automatic adjusting beam splitter, and calculating and processing a fluorescence signal output by the sampling and measuring module to finally obtain the real-time concentration data of the active intermediate. The invention aims to realize automation of optical fiber replacement and optical path adjustment processes, so that the operation stability of a gas expansion laser-induced fluorescence detection technology is improved, and unattended operation is realized.

Description

Technical Field

[0001] The invention relates to the technical fields of optics, atmospheric environment monitoring and automatic control, 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 many years to detect components such as the atmosphere, water, and organic matter. The method of measuring the concentration of active intermediates based on low-pressure laser induced fluorescence technology is called gas expansion laser induced fluorescence technology, which is the main measurement technology for active intermediates in the ambient atmosphere. The 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. The gas sampling adopts gas expansion technology to sample active intermediates in the atmosphere through a small hole with a diameter of 1mm or less above the fluorescence detection cell. The airflow sample expands rapidly below the sampling port, and the laser light source continuously excites the active intermediates in the sampled airflow to produce fluorescence signals. The concentration of the active intermediates is calculated based on the intensity of the fluorescence signal generated by the excitation combined with the standard source. Gas expansion laser induced fluorescence technology has the advantages of low sampling loss, low system detection limit and low interference, but it also has some disadvantages. As mentioned above, the data measured by gas expansion laser induced fluorescence technology is the intensity of fluorescence signal, which needs to be calibrated by standard source to obtain calibration coefficient before the concentration of active intermediate can be inferred. The calibration coefficient is affected by many factors, and the replacement of optical fiber and the change of optical path state caused by time are the most influential factors. Since the gas expansion laser induced fluorescence instrument generally transmits the laser emitted by the light source to the low-pressure fluorescence detection pool through optical fiber, due to the limited life of optical fiber, replacement of optical fiber is inevitable, but replacement of optical fiber is a cumbersome process, and there are many detailed factors that are difficult to control manually. It is impossible to ensure the consistency before and after the replacement of optical fiber, and the state of the optical path will slowly change over time, which leads to a large change in the calibration coefficient before and after the replacement of optical fiber or over time, resulting in poor system stability of gas expansion laser induced fluorescence instrument. Sometimes, such as when the gas expansion laser induced fluorescence instrument is installed in a super station (atmospheric monitoring super station), observation tower, etc., or when the system operation environment is very harsh, it is very inconvenient to manually replace the optical fiber, and it is impossible to manually judge the changes in the optical fiber status over time in real time. Summary of the invention

[0003] In order to overcome the defects in the above-mentioned prior art, the present invention provides a gas expansion laser induced fluorescence detection device with self-adjusting optical path, which aims to realize the automation of optical fiber replacement and optical path adjustment process, and accurately and real-time control the optical path adjustment effect by monitoring the laser energy at various locations in the detection device, thereby improving the optical fiber adjustment effect and the consistency before and after the optical fiber replacement, and can correct the changes in the optical path state over time in real time, thereby improving the stability of the gas expansion laser induced fluorescence instrument system and enabling the instrument to be unattended during long-term operation.

[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 comprises: a light source module, N optical fibers, an automatic optical fiber coupler, an automatic optical fiber changer, an automatic adjustment collimator, an automatic adjustment beam splitter, a sampling measurement module, and a monitoring 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 a light inlet head of N optical fibers, which is used to select and couple the laser emitted by the light source module into a certain optical fiber, and the optical fiber is used as a transmission optical fiber to conduct the laser to the sampling and measurement module;

[0008] The automatic optical fiber changer is fixed with the necks of the light output heads of N optical fibers, which are used to select and input the light output heads of the transmission optical fibers into the automatic adjustment collimator;

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

[0010] The automatic adjustment beam splitter is used to coaxially adjust the collimated light beam output from the automatic adjustment collimator to the sampling and measuring module;

[0011] The sampling and measuring module is the place where the collimated light 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 energy of the laser at various locations in the detection device, control the operation of the automatic optical fiber coupler, the automatic optical fiber changer, the automatic adjustment collimator and the automatic adjustment beam splitter, and simultaneously calculate and process the fluorescence signal output by the sampling and measurement module, and finally obtain the real-time concentration data of the active intermediate.

[0013] Preferably, the optical fiber automatic coupler comprises: an optical plate for fixing components on the optical fiber automatic coupler, a two-dimensional translation stage for translating the optical fiber 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 optical fiber head, a No. 1 fixing frame for fixing the No. 1 rotating stage to the two-dimensional translation stage, a No. 1 rotating stage for rotating the optical fiber head along the center of the No. 1 rotating stage, a No. 1 rotating disk for increasing the rotation radius of the No. 1 rotating stage and fixing the optical fiber head, and an electric regulator for controlling the automatic rotation of the knob;

[0014] The two-dimensional translation stage and the lens bracket are fixed on the optical flat plate; the No. 1 rotating stage is fixed on the translation top surface of the two-dimensional translation stage through the No. 1 fixing frame; the rotation top surface of the No. 1 rotating stage is perpendicular to the translation top surface of the two-dimensional translation stage; the electric regulator is installed on the knob for adjusting the front and rear translation and left and right translation of the translation stage on the two-dimensional translation stage, and the electric regulator is installed on the knob for adjusting the rotation of the rotating stage on the No. 1 rotating stage; N SMA threaded columns for installing the optical fiber into the optical head are arranged on the periphery of one side of the No. 1 rotating disk, and each SMA threaded column is installed with an optical fiber, and the other side of the No. 1 rotating disk is coaxially installed on the rotation top surface of the No. 1 rotating stage; the coupling lens is installed on the lens bracket, and the coupling lens is coaxial with a certain optical fiber installed on the No. 1 rotating disk.

[0015] Preferably, the automatic optical fiber changer comprises: an optical fiber fixing clamp for clamping the neck of the optical fiber light output head, a No. 2 rotating disk for installing the optical fiber fixing clamp, a No. 2 rotating table for driving the No. 2 rotating disk to rotate, a slide for driving the optical fiber light output head to move forward and backward, a slide rail for making the slide move forward and backward in a straight line, a No. 2 fixing frame for fixing the No. 2 rotating table to the slide, a cam for pushing the slide to move forward and backward, a steering gear for driving the cam to rotate, a steering gear fixing frame for installing and fixing the steering gear, a No. 2 tension spring installed between the slide and the steering gear fixing frame to generate elastic tension, and an electric regulator for controlling the automatic rotation of the knob;

[0016] The slide is mounted on the slide rail, and the No. 2 rotating table is fixed on the top surface of the slide through the No. 2 fixing frame, and the rotating top surface of the No. 2 rotating table is perpendicular to the top surface of the slide rail; the electric regulator is installed on the knob on the No. 2 rotating table for adjusting the rotation of the rotating table; N through holes are opened around the No. 2 rotating disk, and one side of the No. 2 rotating disk is respectively installed with an optical fiber fixing clamp at each through hole, and an optical fiber is clamped on each optical fiber fixing clamp, and the clamping position is the neck of the optical fiber light output head, and the other side of the No. 2 rotating disk is installed on the rotating top surface of the No. 2 rotating table; the servo fixing frame is fixed on the side of the slide rail away from the No. 2 rotating table, the servo is fixed on the servo fixing frame, the output shaft of the servo is perpendicular to the top surface of the slide, and the cam is installed on the output shaft of the servo; the slide and the servo fixing frame are connected by a No. 2 tension spring, so that there is always elastic tension between the two, so that the cam is always in contact with the slide.

[0017] Preferably, the optical fiber fixing clamp comprises: an upper clamp and a lower clamp for clamping the optical fiber, and a torsion spring for clamping the upper clamp and the lower clamp together;

[0018] Two fixing holes are provided on one side of the lower clamp for fixing to the No. 2 rotating disk. The clamping hole formed after the upper clamp and the lower clamp 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 light output head. The torsion spring is installed on the inner side of the clamping legs of the upper clamp and the lower clamp.

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

[0020] A gear is installed on the output shaft of the deceleration stepper motor and meshes with the gear on the optical fiber collimator; the optical fiber collimator is installed in a collimator cage mounting frame.

[0021] Preferably, the optical fiber fixer comprises: a fixing plate for installing a micro rotating rod, a gear and a motor fixing frame, a micro telescopic rod that can be extended and retracted in the micro rotating rod, a micro rotating rod that drives the elastic friction rod to move, an elastic friction rod that can drive the SMA threaded head of the optical fiber light output head to rotate clockwise or counterclockwise, a gear that transmits the rotation output of the micro stepping motor to the micro rotating rod, a micro stepping motor that drives the gear to rotate, and a motor fixing frame that fixes the micro stepping motor to the fixing plate;

[0022] The fixing plate is provided with a through hole, the diameter of which is larger than the diameter of the SMA threaded head of the optical fiber light outlet head; a micro-stepping motor with a gear mounted on the output shaft and two gears are installed on one side of the fixing plate, the two gears are located on the upper and lower sides of the micro-stepping motor and mesh with the gears on the output shaft of the micro-stepping motor, and the micro-stepping motor is fixed to the fixing plate through a motor fixing frame; a group of multi-link mechanisms are symmetrically installed on the upper and lower sides of the through hole on the other side of the fixing plate, and the multi-link mechanism is composed of two micro-rotating rods, two micro-telescopic rods and an elastic friction rod; in a group of multi-link mechanisms, one of the micro-rotating rods The rotating rod is connected to a gear installed 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 provided in the micro rotating rod, so that there is always an elastic thrust when the micro telescopic rod is telescoped in the micro rotating rod; a serrated rubber pad is pasted on the lower part of the elastic friction rod, and hinges are provided at both ends of the elastic friction rod, which are connected to the end of the micro telescopic rod, and the two can rotate with each other at the position of the hinge; the SMA threaded head of the optical fiber light outlet head passes through the through hole opened on the fixed plate and is clamped by the two elastic friction rods.

[0023] Preferably, the optical fiber collimator comprises: a gear threaded cylinder 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 pressing 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 head for fixing the optical fiber light output head, and a cylinder with fine-pitch positive external threads is coaxially provided on the back of the SMA threaded column; a groove for mounting a collimating lens is provided 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 a gear on the outer surface, and the front half of the inner surface is provided with a fine-pitch positive internal thread, which is meshed with the fine-pitch positive external thread of the cylinder on the collimator cage mounting frame, and the rear half is provided with a fine-pitch reverse internal thread, which is meshed with the fine-pitch reverse external thread on the lens mounting cylinder; the outer side of the cylinder with fine-pitch positive external threads on the collimator cage mounting frame is provided with a sliding groove that matches the inner side of the lens mounting cylinder, so that the two can slide left and right.

[0025] Preferably, the automatic adjustment beam splitter comprises: a 45-degree cage frame, a 45-degree motor mounting frame for fixing the electric adjuster to the 45-degree cage frame, and an electric adjuster for controlling the automatic rotation of a knob on the 45-degree cage frame;

[0026] A No. 2 beam splitter is installed in the forty-five-degree cage frame, and the No. 2 beam splitter is used to split the collimated light beam output from the automatic adjustment collimator; the forty-five-degree cage frame is connected to the collimator cage mounting frame; there are two electric regulators installed on the automatic adjustment beam splitter, which are respectively installed on the two adjustment knobs of the forty-five-degree cage frame, and are used to adjust the deflection angle of the No. 2 beam splitter, and both are fixed to the forty-five-degree cage frame through the forty-five-degree motor mounting frame.

[0027] Preferably, the electric adjuster includes: a replaceable joint for driving the rotation of the knob of the optical mechanical part, a joint sleeve for driving the replaceable joint to rotate, a micro-reduction stepper motor for driving the joint sleeve to rotate, an elastic coupling for connecting the micro-reduction stepper motor and the joint sleeve, an outer shell for fixing the electric adjuster to the optical mechanical part, an inner shell for the micro-reduction stepper motor and enabling the micro-reduction stepper motor to slide up and down relative to the outer shell, and a No. 1 tension spring for generating elastic tension between the outer shell and the inner shell.

[0028] Preferably, the light source module comprises: a laser that emits light that can cause the active intermediate to generate fluorescence and a beam splitter No. 1; the beam splitter No. 1 is used to split the laser light emitted by the laser.

[0029] Preferably, the sampling and measuring module comprises: a fluorescence cell that intersects the collimated light beam with the sampling airflow and generates fluorescence, a sampling nozzle that generates a high-speed jet of the ambient atmosphere carrying the active intermediate, and an optical arm that reduces the stray light around the collimated light beam;

[0030] The sampling nozzle is a conical structure with a small hole on the top, the sampling nozzle is located above the fluorescent pool and the top of the cone is far away from the fluorescent pool; optical arms are installed on the left and right sides of the fluorescent pool, and a vacuum pump is connected below the fluorescent pool; wherein the collimated light beam output from the automatic adjustment collimator enters the fluorescent pool through the optical arm on the right, and after the collimated light beam intersects with the active intermediate in the fluorescent pool to generate fluorescence, it is emitted from the optical arm on the left;

[0031] The outer end of the optical arm, ie, the end away from the fluorescent pool, is provided with a window sheet for sealing the cavity and allowing laser light to pass through. A plurality of conical apertures are provided inside the optical arm. A photomultiplier tube is provided on the back of the fluorescent pool.

[0032] Preferably, the monitoring and control system includes: an energy meter No. 1 for monitoring the first laser energy emitted from the sampling and measuring 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 adjustment collimator, a single-chip microcomputer and an industrial computer; the single-chip microcomputer is used to control the rotation of all motors in the detection device; the industrial computer is used to receive energy signals from each energy meter and firefly signals, and control the operation of the single-chip microcomputer.

[0033] A method for detecting gas expansion laser induced fluorescence with self-adjusting optical path is applicable to the above-mentioned gas expansion laser induced fluorescence detection device with self-adjusting optical path. The method for automatically replacing optical fiber comprises the following steps:

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

[0035] S12, automatically adjusting the collimator to dismantle the light output head of the old transmission optical fiber that is currently fixed;

[0036] S13, the servo of the automatic optical fiber changer rotates, so that the slide table drives the optical fiber fixing clamp on the second rotating disk to move close to the automatic adjustment collimator, so that the optical fiber fixing clamp squeezes and clamps the neck of the light output head of the old transmission optical fiber through the clamping hole with a chamfered angle on the cylindrical hole, and the servo rotates again, so that the slide table drives the second rotating disk to move away from the automatic adjustment collimator, so that the old transmission optical fiber clamped by the optical fiber fixing clamp is separated from the optical fiber fixer;

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

[0038] S15, the servo of the automatic optical fiber changer rotates, so that the slide table drives the new transmission optical fiber head on the second rotating disk to move close to the automatic adjustment collimator, and the new transmission optical fiber head is inserted into the automatic adjustment collimator;

[0039] S16, automatically adjust the collimator to fix the new transmission optical fiber output head;

[0040] S17, the servo of the automatic fiber changer rotates, causing the slide to drive the second rotating disk to move away from the automatic adjustment collimator, so that the new transmission fiber optic head is detached from the fiber optic fixing clamp.

[0041] The advantages of the present invention are:

[0042] (1) The present invention provides a gas expansion laser induced fluorescence detection device with self-adjusting optical path, which is intended to realize the automation of optical fiber replacement and optical path adjustment process, and accurately and real-timely control the optical path adjustment effect by monitoring the laser energy at various locations in the detection device, thereby improving the optical fiber adjustment effect and the consistency before and after optical fiber replacement, and can correct the changes in the optical path state over time in real time, thereby improving the stability of the gas expansion laser induced fluorescence instrument system and enabling the instrument to be unattended during long-term operation.

[0043] (2) The fiber optic automatic coupler of the device of the present invention uses a highly accurate optical two-dimensional translation stage and an optical rotation stage to drive the movement of the fiber optic light inlet head, so that the adjustment accuracy of the optical fiber is very high. The up and down movement of the fiber optic light inlet head is driven by the optical rotation stage. When the rotation angle is small, the up and down coupling positions of the fiber optic light inlet head can be fine-tuned. When the rotation angle is large, the effect of replacing the optical fiber can be achieved.

[0044] (3) The up and down movement of the optical fiber head clamped on the automatic optical fiber changer of the device of the present invention is driven by the optical rotating table, which has high precision and can be accurately aligned with the SMA threaded column on the automatic adjustment collimator.

[0045] (4) The neck of the optical fiber head of the device of the present invention is clamped to the automatic optical fiber changer by the optical fiber fixing clamp, so that when the optical fiber head is fixed to the SMA threaded column of the automatic adjustment collimator, the neck of the optical fiber head can be detached from the optical fiber fixing clamp under the action of tension. In addition, since the inner surface of the optical fiber fixing clamp that clamps the neck of the optical fiber is chamfered, when the optical fiber head is unscrewed from the SMA threaded column of the automatic adjustment collimator, the neck of the optical fiber head can be clamped to the optical fiber fixing clamp again under the action of thrust. This design ensures that there is no rigid contact between the automatic optical fiber changer and the optical fiber after the optical fiber is replaced, so that the vibration or state change of the automatic optical fiber changer, which is large in size and weight, does not affect the normal operation of the optical fiber.

[0046] (5) The optical fiber fixer of the device of the present invention is driven by a multi-link mechanism driven by a stepper motor. Since the micro-telescopic rod can be slightly extended and retracted within the micro-rotating rod, and the elastic friction rod has a certain elasticity and a large friction force, the forward and reverse rotation of the optical fiber light output head can be achieved by only one motor.

[0047] (6) The focus distance of the automatic collimator of the device of the present invention is changed by rotating the fine-pitch thread. Half of the inner wall of the gear thread cylinder is provided with a forward thread, and the other half is provided with a reverse thread. A cylinder with a fine-pitch forward outer thread is provided on the collimator cage mounting frame. The outer side of the cylinder is provided with a slide groove that matches the inner side of the lens mounting cylinder, so that only left and right sliding movement can occur between the two. This allows the automatic collimator driven by the stepper motor to directly and finely adjust the focus distance after the optical fiber is installed, without unscrewing the optical fiber.

[0048] (7) The replaceable joint of the electric regulator of the device of the present invention is connected to the micro-reduction stepping motor that drives its rotation through an elastic coupling, and the replaceable joint can be elastically retracted, so that the electric regulator can be installed on the knob of most standard manual optical mechanical parts through a simple fixing frame, and can be normally transmitted without precise alignment. In addition, the replaceable joint adopts a magnetically replaceable method, so that the electric regulator can match the knob of most models of standard manual optical mechanical parts. Therefore, the electric regulator of the device of the present invention has strong versatility and can turn most standard manual optical mechanical parts into electric optical mechanical parts. This greatly expands the function of manual optical mechanical parts and reduces the cost compared with fully electric optical mechanical parts. For example, the electric regulator is only installed on a knob that needs to be adjusted frequently on the three-dimensional translation stage, and can 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 optical path is still adjusted using its own adjustment knob, so that the optical mechanical part installed with the electric regulator still has its original high precision. The electric regulator is driven by a micro-reduction stepping motor, so that the electric regulator can self-lock when powered on, and the original manual knob can still be used when powered off.

[0050] (9) The monitoring and control system of the device of the present invention uses three energy meters distributed in the device of the present invention. This allows the industrial computer to accurately control the movement of the stepper motor in the device through the single-chip microcomputer after obtaining the energy at the three key positions, so that the coupling, alignment, and coaxiality of the optical fiber remain stable before and after replacement. At the same time, the energy status of each position can be monitored in real time, so that changes in the optical fiber status 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 alignment and automatic coaxiality adjustment, which can realize real-time correction of optical fiber coupling, alignment and coaxiality status. The method of the present invention can automate the tedious work of replacing optical fibers, and accurately realize the optical fiber coupling, alignment and coaxiality adjustment work that is difficult to accurately control manually in a way of combining automated optical machinery with energy monitoring, thereby ensuring the consistency of the optical path before and after the optical fiber replacement, and improving the stability of the gas expansion laser induced fluorescence detection technology whose system sensitivity is greatly affected by the optical fiber coupling, collimation effect and coaxiality of the collimated light. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic 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 1 is a cross-sectional view and an axonometric view of an electric regulator provided by an embodiment of the present invention.

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

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

[0056] Figure 5 The figures are an axonometric view and a cross-sectional view of an optical fiber fixing clamp and an optical fiber light output head provided in an embodiment of the present invention.

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

[0058] Figure 7 1. The figure shows a rear view and an axonometric view of the optical fiber rotater provided by an embodiment of the present invention.

[0059] Figure 8 1 and 2 are a cross-sectional view and an axonometric view of an optical fiber coupler provided in an embodiment of the present invention.

[0060] Fig. 9 is a front view of the second 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 pool, 3-No. 1 energy meter, 4-aperture, 5-optical arm, 6-automatic adjustment collimator, 601-reduction stepper motor, 602-optical fiber rotator, 6021-fixing plate, 6022-micro telescopic rod, 6023-micro rotating rod, 6024-elastic friction rod, 6025-gear, 6026-micro stepper motor, 6027-motor fixing frame, 603-rotator fixing plate, 604-collimator cage mounting frame, 605 -Fiber collimator, 6051-gear threaded barrel, 6052-collimating lens, 6053-lens pressure ring, 6054-lens mounting barrel, 606-cage adapter plate, 7-automatic fiber changer, 701-fiber fixing clamp, 7011-torsion spring, 7012-upper clamp, 7013-lower clamp, 702-No. 2 rotating disk, 7021-quarter circular edge, 7022-fiber through hole, 7023 fiber clamp mounting hole, 703-No. 2 rotating table, 704-slide rail, 705-slide, 706-No. 2 fixed frame, 707-No. 2 tension spring, 708-cam, 709-servo fixed frame, 7010-servo, 8-single chip microcomputer, 9-optical fiber, 10-optical fiber automatic coupler, 1001-optical plate, 1002-two-dimensional translation stage, 1003-lens bracket, 1004-coupling lens, 1005-No. 1 fixed frame, 1006-No. 1 rotating table, 1007-No. 1 rotating disk, 11-No. 2 energy meter, 12 -Laser, 13-No. 1 beam splitter, 14-Industrial computer, 15-No. 3 energy meter, 16-Automatic adjustment beam splitter, 1601-Forty-five degree cage mirror frame, 1602-Forty-five degree motor mounting frame, 17-Electric regulator, 1701-Magnet, 1702-Elastic coupling, 1703-Replaceable joint, 1704-Joint sleeve, 1705-Outer shell, 1706-Inner shell, 1707-Micro reduction stepper motor, 1708-No. 1 tension spring. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] Example 1

[0065] Depend on Figure 1 As 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, an optical fiber automatic coupler 10, an automatic optical fiber changer 7, an automatic adjustment collimator 6, an automatic adjustment beam splitter 16, a sampling measurement module and a monitoring control system;

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

[0067] The optical fiber automatic coupler 10 is fixed with light inlet heads of N optical fibers 9, which is used to select and couple the laser emitted by the light source module into a certain optical fiber 9. The optical fiber 9 is used as a transmission optical fiber to conduct the laser to the sampling and measurement module.

[0068] The automatic fiber changer 7 is fixed with the necks of the light output heads of N optical fibers 9, which is used to select the light output heads of the transmission optical fibers and input them into the automatic adjustment collimator 6;

[0069] The automatic adjustment collimator 6 is used to fix the light output 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 adjustment beam splitter 16 is used to adjust the collimated light beam output from the automatic adjustment collimator 6 to the sampling and measuring module;

[0071] The sampling and measuring module is the 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 locations in the detection device, control the operation of the automatic optical fiber coupler 10, the automatic optical fiber changer 7, the automatic adjustment collimator 6 and the automatic adjustment beam splitter 16, and simultaneously calculate and process the fluorescence signal output by the sampling and measurement module, and finally obtain the real-time concentration data of the active intermediate.

[0073] See also Figure 1 The light source module includes: a laser 12 that emits laser light that can cause the active intermediate to produce fluorescence and a beam splitter 13 that deflects the laser light by 90 degrees and splits the laser light.

[0074] Specifically, the first beam splitter 13 is installed at the light outlet of the laser 12, the angle between its beam splitting surface and the laser emitted by the laser 12 is 45 degrees, and the transmittance of the first beam splitter 13 is 10%.

[0075] See also Figure 1 The sampling and measuring module includes: a sampling nozzle 1 for generating a high-speed jet of the ambient atmosphere carrying active intermediates, a fluorescence pool 2 for intersecting a collimated light beam with a sampling airflow and generating fluorescence, and an optical arm 5 for reducing stray light around the collimated light beam.

[0076] Specifically, the sampling nozzle 1 is a conical structure with a small hole on the top, which is installed at the bottom of the fluorescent pool 2, and the top of the cone is far away from the fluorescent pool 2. Optical arms 5 are installed on both sides of the fluorescent pool 2. The optical arms 5 are cylindrical, and multiple conical apertures are installed inside. The outer end of the optical arm 5, that is, the end away from the fluorescent pool 2, is equipped with a window piece for sealing the cavity and transparent to the laser. A photomultiplier tube is installed on the back of the fluorescent pool 2, and the lower part of the fluorescent pool 2 is connected to a vacuum pump. The collimated light beam output from the automatic collimator 6 enters the fluorescent pool 2 through the right optical arm 5. After the collimated light beam intersects with the active intermediate in the fluorescent pool 2 to generate fluorescence, it is emitted from the left optical arm 5.

[0077] See also Figure 1 The monitoring and control system includes: a No. 1 energy meter 3 for monitoring the energy of the first laser emitted from the optical arm 5 on the left side of the sampling and measuring module, a No. 2 energy meter 11 for monitoring the energy of the second laser emitted from the laser 12 of the light source module, a No. 3 energy meter 15 for monitoring the energy of the third laser (collimated light beam) emitted from the automatic adjustment collimator 6, an aperture 4 for locating the center of the collimated light beam, a single-chip microcomputer 8 for controlling the rotation of all motors in the device of the present invention, and an industrial computer 14 for receiving signals from the three energy meters and the photomultiplier tube and controlling the single-chip microcomputer 8.

[0078] Specifically, the aperture 4 is located between the left optical arm 5 of the sampling and measuring module and the first energy meter 3, and is used to locate the center of the collimated light beam. Its aperture is consistent with the diameter of the collimated light beam. The first energy meter 3, the aperture 4 and the optical arm 5 are all coaxially installed. The industrial computer 14 directly receives the signals of the first energy meter 3, the second energy meter 11, the third energy meter 15 and the photomultiplier tube installed on the back of the fluorescent cell 2. The industrial computer 14 indirectly controls the rotation of all motors in the device of the present invention through the single-chip computer 8.

[0079] Example 2

[0080] See also Figure 3 The optical fiber automatic coupler 10 that can be used in the above-mentioned embodiment 1 includes: an optical plate 1001 for fixing components on the optical fiber automatic coupler 10, a two-dimensional translation stage 1002 that can make the optical fiber 9 optical head translate forward, backward, left and right, a lens bracket 1003 for fixing a coupling lens 1004, a coupling lens 1004 for focusing and coupling the laser emitted by the light source module to the optical fiber 9 optical head, a laser generated by the light source module to the optical fiber 9 in the sampling and measuring module, a No. 1 fixing frame 1005 for fixing a No. 1 rotating stage 1006 to the two-dimensional translation stage 1002, a No. 1 rotating stage 1006 that can make the optical fiber 9 optical head rotate along the center of the No. 1 rotating stage 1006, a No. 1 rotating disk 1007 that increases the rotation radius of the No. 1 rotating stage 1006 and fixes the optical fiber 9 optical head, and an electric regulator 17 for controlling the automatic rotation of the knobs on the two-dimensional translation stage 1002 and the No. 1 rotating stage 1006;

[0081] Specifically, the two-dimensional translation stage 1002 and the lens holder 1003 are fixed on the optical flat plate 1001, and the first rotating stage 1006 is fixed on the translation top surface of the two-dimensional translation stage 1002 through the first fixed frame 1005, and the rotation top surface of the first rotating 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 rotation knob of the first rotating stage 1006, and are fixed to the bottom of these three knobs through a fixed frame. The first rotating disk 1007 is in the shape of a disk, and the periphery of one side thereof is provided with eight SMA threaded columns for installing the optical fiber 9 into the optical head, and each of the eight SMA threaded columns is provided with an optical fiber 9, and the other side of the first rotating disk 1007 provided with the SMA threaded columns is coaxially installed on the rotation top surface of the first rotating stage 1006. The coupling lens 1004 is mounted on the lens holder 1003 , and the coupling lens 1004 is coaxial with the optical fiber 9 mounted on the rightmost side of the first rotating disk 1007 .

[0082] The two electric regulators 17 mounted on the two-dimensional translation stage 1002 can rotate clockwise or counterclockwise to drive the optical fiber 9 into the optical head. Figure 3 The electric regulator 17 mounted on the first rotating table 1006 rotates clockwise or counterclockwise to drive the optical fiber 9 to rotate around the central axis of the first rotating table 1006, when the optical fiber 9 is in Figure 3 When the electric regulator 17 on the far right side and mounted on the first rotating platform 1006 rotates slowly, the optical fiber 9 enters the optical head approximately along Figure 3 Z-axis forward or reverse motion is shown.

[0083] Example 3

[0084] See also Figure 4 The automatic optical fiber changer 7 that can be used in the above-mentioned embodiment 1 includes: an optical fiber fixing clamp 701 for clamping the neck of the optical fiber 9, a second rotating disk 702 for installing the optical fiber fixing clamp 701, a second rotating table 703 for driving the second rotating disk 702 to rotate, a slide rail 704 that allows the slide 705 to only move forward and backward in a straight line, a slide 705 that drives the optical fiber 9 to move forward and backward, a second fixing frame 706 that fixes the second rotating table 703 to the slide 705, a second tension spring 707 that generates elastic tension between the slide 705 and the steering gear fixing frame 709, a cam 708 that pushes the slide 705 to move forward and backward, a steering gear fixing frame 709 for installing and fixing a steering gear 7010, a steering gear 7010 that drives the cam 708 to rotate, and an electric regulator 17 that controls the automatic rotation of the knob on the second rotating table 703.

[0085] Specifically, the slide 705 is mounted on the slide rail 704, and the second rotating platform 703 is fixed on the top surface of the slide 705 through the second fixing frame 706. The rotating top surface of the second rotating platform 703 is perpendicular to the top surface of the slide rail 704. There is only one electric regulator 17 installed on the automatic optical fiber changer 7, which is installed on the rotating top surface of the second rotating platform 703 and fixed to the bottom of the rotating knob through a fixing frame. Fig. 9 The second rotating disk 702 is in the shape of a quarter circular disk, and eight optical fiber through holes 7022 are evenly opened along the periphery of the quarter circular edge 7021, and two optical fiber clamp mounting holes 7023 are opened next to each optical fiber through hole 7022. Eight optical fiber fixing clamps 701 are respectively installed on one side of the position of the eight optical fiber through holes 7022, and each of the eight optical fiber fixing clamps 701 is clamped with an optical fiber 9, and the clamping position is the neck of the optical fiber 9 exiting the light head. The other side of the No. 2 rotating disk 702 on which the optical fiber fixing clamp 701 is installed is installed on the rotating top surface of the No. 2 rotating table 703. The rotation center 7024 of the No. 2 rotating disk 702 is coaxial with the rotation axis of the No. 2 rotating table 703. The angle between the two outermost lines of the eight optical fiber through holes 7022 opened on the No. 2 rotating disk 702 and the rotation center 7024 of the No. 2 rotating disk 702 is 90 degrees. The servo fixing frame 709 is fixed on the side of the slide rail 704 away from the second rotating table 703, the servo 7010 is fixed on the servo fixing frame 709, the output shaft of the servo 7010 is perpendicular to the top surface of the slide 705, and the cam 708 is installed on the output shaft of the servo 7010. The slide 705 and the servo fixing frame 709 are connected by two second tension springs 707, so that there is always elastic tension between the two, so that the cam 708 is always in contact with the slide 705.

[0086] See also Figure 5 The optical fiber fixing clamp 701 includes: a torsion spring 7011 for clamping the upper clamp 7012 and the lower clamp 7013 to each other, and the upper clamp 7012 and the lower clamp 7013 for clamping the optical fiber 9;

[0087] One side of the lower clamp 7013 is provided with two fixing holes for fixing to the No. 2 rotating disk 702, which cooperate with and are installed and fixed with the optical fiber clamp installation hole 7023. The clamping hole formed after the upper clamp 7012 and the lower clamp 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. The chamfer on the clamping hole is 15 degrees. The torsion spring 7011 is installed on the inner side of the clamping legs of the upper clamp 7012 and the lower clamp 7013.

[0088] Example 4

[0089] See also Figure 6The automatic adjustment collimator 6 that can be used in the above-mentioned embodiment 1 includes: a deceleration stepper motor 601 for driving the optical fiber collimator 605 to realize automatic focusing, an optical fiber rotator 602 for fixing the optical fiber 9 light head to the optical fiber collimator 605 or removing it from the optical fiber collimator 605, a rotator fixing plate 603 for fixing the optical fiber rotator 602 to the collimator cage mounting frame 604, an optical fiber collimator 605 for collimating the divergent light emitted by the optical fiber 9, a collimator cage mounting frame 604 for fixing the deceleration stepper motor 601 and the optical fiber collimator 605, and a cage adapter plate 606 for connecting and fixing the collimator cage mounting frame 604 and the forty-five degree cage frame 1601 using a stainless steel rod with a diameter of six millimeters;

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

[0091] See also Figure 7 The optical fiber rotating device 602 includes: a fixing plate 6021 for installing a micro rotating rod 6023, a gear 6025 and a motor fixing frame 6027, a micro telescopic rod 6022 that can be extended and retracted in the micro rotating rod 6023, a micro rotating rod 6023 that drives an elastic friction rod 6024 to move, an elastic friction rod 6024 that can drive the SMA threaded head of the optical fiber 9 optical head to rotate clockwise or counterclockwise, a gear 6025 that transmits the rotation output of a micro stepping motor 6026 to the micro rotating rod 6023, a micro stepping motor 6026 that drives the gear 6025 to rotate, and a motor fixing frame 6027 that fixes the micro stepping 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. A micro-stepping motor 6026 with a gear mounted on the output shaft and two gears 6025 are installed on one side of the fixing plate 6021. The two gears 6025 are located on the upper and lower sides of the micro-stepping motor 6026 and mesh with the gears mounted 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 frame 6027. A set of multi-link mechanisms are symmetrically installed above and below the through hole on the other side of the fixing plate 6021. The multi-link mechanism is composed of two micro-rotating rods 6023, two micro-telescopic rods 6022 and an elastic friction rod 6024. In one set of the multi-link mechanisms, the micro-rotating rod 6023 on one side is connected to a gear 6025 mounted on the back of the fixing plate 6021, and the two rotate together, and the micro-rotating rod 6023 on the other side rotates passively. The micro telescopic 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 telescopic rod 6022 is extended and retracted in the micro rotating rod 6023. The elastic friction rod 6024 is a rectangular parallelepiped, and a serrated rubber pad is pasted on the lower part thereof. The two ends of the elastic friction rod 6024 are provided with hinges, which are connected to the ends of the micro telescopic rod 6022, and the two can rotate with each other at the positions of the hinges. The SMA threaded head of the optical fiber 9 exits the through hole opened on the fixed plate 6021 and is clamped by the two elastic friction rods 6024.

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

[0094] Specifically, a square hole for installing the reduction stepper motor 601 is provided on one side of the collimator cage mounting frame 604, and an SMA threaded column for fixing the optical fiber light head is provided on the other side. A cylinder with fine-pitch positive external threads is coaxially provided on the back of the SMA threaded column for fixing the optical fiber 9 light head. The lens mounting cylinder 6054 is cylindrical, with a groove for installing the collimating lens 6052 on one side, and a fine-pitch reverse external thread on the outer surface of the other side. The gear thread cylinder 6051 is a cylindrical structure with a gear on the outer surface, and a fine-pitch positive internal thread is provided on the front half of its inner surface, which matches the fine-pitch positive external thread provided on the collimator cage mounting frame 604, and a fine-pitch reverse internal thread is provided on the rear half, which meshes with the fine-pitch reverse external thread provided on the lens mounting cylinder 6054. The optical fiber collimator 605 is coaxial with the through hole provided in the middle of the fixing plate 6021. The outer side of the cylinder with fine-pitch positive external threads on the collimator cage mounting frame 604 is provided with a sliding groove that matches the inner side of the lens mounting cylinder 6054, so that only left-right sliding movement can occur between the two.

[0095] Since the cylinder provided on the collimator cage mounting frame 604 is provided with a fine pitch positive external thread, the outer surface of the collimator lens mounting cylinder 6054 is provided with a fine pitch reverse external thread, the front half of the inner surface of the gear thread cylinder 6051 is provided with a fine pitch positive internal thread, which matches with the positive external thread provided on the collimator cage mounting frame 604, and the rear half is provided with a fine pitch reverse internal thread, which matches with the reverse external thread provided on the collimator lens mounting cylinder 6054, and the outer side of the cylinder provided with the fine pitch positive external thread on the collimator cage mounting frame 604 is provided with a slide groove which matches 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 collimator lens 6052 away from the collimator cage mounting frame 604, and when the deceleration stepper motor 601 rotates counterclockwise, the collimator lens 6052 approaches the collimator cage mounting frame 604.

[0096] Example 5

[0097] See also Figure 6 , the automatic adjustment beam splitter 16 that can be used in the above-mentioned embodiment 1 includes: a 45-degree cage frame 1601 on which a second beam splitter is installed, a 45-degree motor mounting frame 1602 for fixing the electric regulator 17 to the 45-degree cage frame 1601, and the electric regulator 17 for controlling the automatic rotation of the knob on the 45-degree cage frame 1601;

[0098] Specifically, a second beam splitter with a transmittance of 10% is installed in the 45-degree cage frame 1601, and the 45-degree cage frame 1601 is connected and fixed to the cage mounting frame 605 through four stainless steel rods with a diameter of 6 mm. 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 frame 1601, and are fixed to the 45-degree cage frame 1601 through the 45-degree motor mounting frame 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 frame is a standard cage reflector frame. The electric regulator controls the rotation of the two knobs on the 45-degree cage reflector frame to make the angle of the second beam splitter deflect 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 fluorescent pool 2 is connected and fixed to the 45-degree cage frame 1601 through four stainless steel rods with a diameter of 6 mm.

[0099] Example 6

[0100] See also Figure 2 The electric regulator 17 that can be used in the above-mentioned embodiment includes: a magnet 1701 that attracts a replaceable joint 1703, an elastic coupling 1702 that connects a micro-reduction stepping motor 1707 and a joint sleeve 1704, a replaceable joint 1703 used to drive the hexagon socket screw at the center of the optical mechanical part knob to rotate, a joint sleeve 1704 used to drive the replaceable joint 1703 to rotate, an outer shell 1705 used to fix the electric regulator 17 to the optical mechanical part, an inner shell 1706 used to fix the micro-reduction stepping motor 1707 and enable the micro-reduction stepping motor 1707 to slide up and down relative to the outer shell 1705, the micro-reduction stepping motor 1707 that drives the replaceable joint 1703 to rotate, and a No. 1 tension spring 1708 that generates elastic tension 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 measuring the concentration of active intermediates by the detection device is as follows:

[0106] The vacuum pump pumps the fluorescent pool 2 to a low pressure, and the ambient atmosphere carrying the active intermediate is sucked from the sampling nozzle 1 and ejected into the fluorescent pool 2. The laser emitted by the laser 12 is focused to the light input head of the optical fiber 9 through the No. 1 beam splitter 13 and the coupling lens 1004. The laser propagates in the optical fiber 9 and then exits from the light output head of the optical fiber 9. The emitted divergent laser passes through the collimating lens 6052 and is collimated into a collimated laser beam. The collimated beam enters the fluorescent pool 2 from the window of the right optical arm 5 and intersects with the active intermediate to generate fluorescence. The photomultiplier tube installed at the rear of the fluorescent pool 2 converts the fluorescence signal into an electrical signal S and transmits it to the industrial computer 14. During this period, the signal received by the industrial computer 14 from the No. 1 energy meter 3 is P. The gas with a known concentration c' generated by the standard source is passed to the vicinity of the sampling nozzle 1. The electrical signal s' can be measured in the same way as the above principle. During this period, the signal received by the industrial computer 14 from the No. 1 energy meter 3 is p'. According to the formula, the concentration C of the active intermediate in the ambient atmosphere is calculated as:

[0107]

[0108] The method for automatically replacing an optical fiber by a detection device comprises the following steps:

[0109] S11: When the third laser energy detected by the No. 3 energy meter 15 is less than 1 / 4 of the first laser energy detected by the No. 2 energy meter 11, the electric regulator 17 drives the No. 1 rotating disk 1007 equipped with eight optical fiber input heads to rotate quickly 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 fixer 602 rotates counterclockwise, driving the Figure 7 The upper elastic friction rod 6024 moves to the left, and the lower elastic friction rod 6024 moves to the right, so that the SMA threaded head of the optical fiber 9 clamped between the two elastic friction rods 6024 is rotated counterclockwise until it is unscrewed from the SMA threaded column on the collimator cage mounting frame 604.

[0111] S13: The steering gear 7010 rotates 90 degrees so that the slide 705 drives the fixing clip 701 installed on the second rotating disk 702 to move along Figure 4 The X-axis shown in the figure moves in the opposite direction, so that the optical fiber fixing clamp 701 squeezes and clamps the neck of the optical fiber light output head through the 15-degree chamfer opened on the internal cylindrical hole, and the steering gear 7010 rotates 90 degrees again to make the slide 705 drive the second rotating disk 702 fixed with the optical fiber fixing clamp 701 to rotate along Figure 4 The X-axis moves in the positive direction, so that the optical fiber 9 clamped by the optical fiber fixing clamp 701 is separated from the optical fiber rotating device 602.

[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: The two electric regulators 17 on the automatically adjusted beam splitter 16 drive the No. 2 beam splitter mounted on the forty-five degree cage frame 1601 to deflect greatly, so that the first laser emitted from the sampling and measuring module moves greatly up, down, left and right. When the first laser is just completely blocked by the aperture 4, the energy monitored by the No. 1 energy meter 3 will be close to zero. The industrial computer 14 records the coordinate points at which the first laser is just close to zero after moving in four directions, and records them as boundary points, including four boundary points up, down, left and right. The initial position is taken as the origin. The electric regulator 17 controls the first knob to rotate forward to deflect the light beam upward, and controls the first knob to rotate reversely to deflect the light beam downward. Similarly, the electric regulator 17 controls the second knob to rotate forward and reversely to deflect the light beam left and right. When the laser is deflected excessively up, down, left, and right, the first laser cannot pass through the small hole in the aperture 4, that is, it is completely blocked by the aperture 4. When the first laser is deflected excessively upward so that it 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 design diameter of the small hole in the aperture 4 is consistent with the diameter of the collimated laser beam. Through this adjustment process, a point can be found so that the laser beam just completely passes through the small hole in the aperture 4. Specifically, by recording the number of positive and negative turns of the micro-reduction stepping motor 1707 on the electric regulator 17, the position before adjustment, that is, the initial position, is recorded as the coordinate origin, and the coordinates of the four points can be reversed. First, the coordinate origin is used as the origin, and the coordinates of the two left and right boundary points are obtained by moving greatly left and right. Then, the midpoint of the two left and right boundary points is used as the origin and the coordinates of the two upper and lower boundary points are obtained by moving greatly up and down. 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 adjustment beam splitter (16) is approximately coaxial with the optical arm 5.

[0122] S32: When the deceleration stepper motor 601 rotates slowly clockwise, if the energy on the No. 1 energy meter 3 remains unchanged, the energy at this time is recorded as Pmax, and then rotates counterclockwise until the measured energy begins to slowly decrease, and then rotates slowly clockwise again until the measured energy just becomes Pmax and stops.

[0123] When the deceleration stepper motor 601 rotates slowly clockwise, if the number on the energy meter 3 decreases slowly, it rotates counterclockwise until the measured energy begins to remain constant, and then rotates slowly clockwise again until the measured energy just starts to decrease slowly and stops.

[0124] When the deceleration stepper motor 601 rotates slowly clockwise, if the No. 1 energy meter 3 rises slowly, the deceleration stepper motor 601 is kept rotating clockwise until the energy begins to remain constant, and then the deceleration stepper motor 601 is rotated counterclockwise again until the energy just starts to decrease and stops.

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

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

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

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

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

[0130] By performing the above process once every 12 hours, real-time correction of the fiber coupling, alignment and coaxiality status can be achieved.

[0131] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in 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 comprises: a light source module, N optical fibers (9), an optical fiber automatic coupler (10), an automatic optical fiber changer (7), an automatic adjustment collimator (6), an automatic adjustment beam splitter (16), a sampling and measuring module, and a monitoring and control system; The light source module is used to emit laser light that causes the active intermediate to generate fluorescence; The optical fiber automatic coupler (10) is fixed with a light inlet head of N optical fibers (9) for selectively coupling the laser emitted by the light source module into a certain optical fiber (9). The optical fiber (9) is used as a transmission optical fiber to conduct the laser into the sampling and measurement module. The automatic optical fiber changer (7) is fixed with the necks of the light output heads of N optical fibers (9) and is used to select and input the light output heads of the transmission optical fibers into the automatic adjustment collimator (6); The automatic adjustment collimator (6) is used to fix the light output head of the transmission optical fiber and adjust the collimation distance of the transmission optical fiber to output a collimated light beam; The automatic adjustment beam splitter (16) is used to coaxially adjust the collimated light beam output from the automatic adjustment collimator (6) to the sampling and measuring module; The sampling and measuring module is the place where the collimated light beam intersects with the active intermediate 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 automatic optical fiber coupler (10), the automatic optical fiber changer (7), the automatic adjustment collimator (6) and the automatic adjustment beam splitter (16), and simultaneously calculate and process the fluorescence signal output by the sampling and measurement module, and finally obtain 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, characterized in that: The optical fiber automatic coupler (10) comprises: an optical plate (1001) for fixing components on the optical fiber automatic coupler (10), a two-dimensional translation stage (1002) for making the optical fiber (9) optical head translate forward, backward, left and right, a lens bracket (1003) for fixing a coupling lens (1004), a coupling lens (1004) for focusing and coupling the laser emitted by the light source module to the optical fiber (9) optical head, a first fixing frame (1005) for fixing a first rotating stage (1006) to the two-dimensional translation stage (1002), a first rotating stage (1006) for making the optical fiber (9) optical head rotate along 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 optical fiber (9) optical head, and an electric regulator (17) for controlling the automatic rotation of a knob; The two-dimensional translation stage (1002) and the lens bracket (1003) are fixed on the optical flat plate (1001); the first rotating stage (1006) is fixed on the translation top surface of the two-dimensional translation stage (1002) via the first fixing frame (1005); the rotation top surface of the first rotating stage (1006) is perpendicular to the translation top surface of the two-dimensional translation stage (1002); the electric regulator (17) is installed on the knob for adjusting the front and rear translation and the left and right translation of the translation stage on the two-dimensional translation stage (1002); and the electric regulator (17) is installed on the knob for adjusting the front and rear translation and the left and right translation of the translation stage on the first rotating stage (1006). The electric regulator (17) is installed on the knob for adjusting the rotation of the rotating table; N SMA threaded columns for installing the optical fiber (9) into the optical head are arranged on the periphery of one side of the first rotating disk (1007), and each SMA threaded column is installed with an optical fiber (9); the other side of the first rotating disk (1007) is coaxially installed on the rotating top surface of the first rotating table (1006); the coupling lens (1004) is installed on the lens bracket (1003), and the coupling lens (1004) is coaxial with a certain optical fiber (9) installed on the first rotating 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 optical fiber changing device (7) comprises: an optical fiber fixing clamp (701) for clamping the neck of the optical fiber (9) light output head, a second rotating disk (702) for installing the optical fiber fixing clamp (701), a second rotating table (703) for driving the second rotating disk (702) to rotate, a sliding table (705) for driving the optical fiber (9) light output head to move forward and backward, a sliding rail (704) for causing the sliding table (705) to move forward and backward in a straight line, and a fixing plate (705) for fixing the second rotating table (703). A second fixing frame (706) mounted on the slide (705), a cam (708) for pushing the slide (705) to move forward and backward, a steering gear (7010) for driving the cam (708) to rotate, a steering gear fixing frame (709) for installing and fixing the steering gear (7010), a second tension spring (707) installed between the slide (705) and the steering gear fixing frame (709) to generate elastic tension, and an electric regulator (17) for controlling the automatic rotation of a knob; The slide (705) is mounted on the slide rail (704); the second rotating table (703) is fixed on the top surface of the slide (705) through the second fixing frame (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 on the second rotating table (703) for adjusting the rotation of the rotating table; N through holes are opened on the periphery of the second rotating disk (702); one side of the second rotating disk (702) is respectively installed with an optical fiber fixing clamp (701) at each through hole; each optical fiber fixing clamp (701) is clamped with an optical fiber (9), and the clamping position is the light emitting position of the optical fiber (9). The second rotating disk (702) is mounted on the rotating top surface of the second rotating platform (703); the steering gear fixing frame (709) is fixed on the side of the slide rail (704) away from the second rotating platform (703); the steering gear (7010) is fixed on the steering gear fixing frame (709); the output shaft of the steering gear (7010) is perpendicular to the top surface of the slide (705); the cam (708) is mounted on the output shaft of the steering gear (7010); the slide (705) and the steering gear fixing frame (709) are connected by a second tension spring (707) so that there is always elastic tension between the two, so that the cam (708) is always in contact with the slide (705).

4. The gas expansion laser induced fluorescence detection device with self-adjusting optical path according to claim 3, characterized in that: The optical fiber fixing clamp (701) comprises: an upper clamp (7012) and a lower clamp (7013) for clamping the optical fiber (9), and a torsion spring (7011) for clamping the upper clamp (7012) and the lower clamp (7013) together; Two fixing holes are provided on one side of the lower clamp (7013) for fixing to the second rotating disk (702); the clamping hole formed after the upper clamp (7012) and the lower clamp (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); the torsion spring (7011) is installed on the inner side of the clamping legs of the upper clamp (7012) and the lower clamp (7013).

5. The gas expansion laser induced fluorescence detection device with self-adjusting optical path according to claim 1, characterized in that: The automatic adjustment collimator (6) comprises: an optical fiber collimator (605) for collimating divergent light emitted by the optical fiber (9), an optical fiber fixer (602) for fixing the light output head of the optical fiber (9) to the optical fiber collimator (605) or removing it from the optical fiber collimator (605), and a deceleration stepping motor (601) for driving the optical fiber collimator (605) to achieve automatic focusing; A gear is mounted on the output shaft of the deceleration stepping motor (601) and meshes with a gear on the optical fiber collimator (605); the optical fiber collimator (605) is mounted in a collimator cage mounting frame (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 rotating device (602) comprises: a fixing plate (6021) for mounting a micro rotating rod (6023), a gear (6025) and a motor fixing frame (6027), a micro telescopic rod (6022) that can be extended and retracted in the micro rotating rod (6023), a micro rotating rod (6023) that drives an elastic friction rod (6024) to move, an elastic friction rod (6024) that can drive the SMA threaded head of the optical fiber (9) to rotate clockwise or counterclockwise, a gear (6025) that transmits the rotation output of a micro stepping motor (6026) to the micro rotating rod (6023), a micro stepping motor (6026) that drives the gear (6025) to rotate, and a motor fixing frame (6027) that fixes the micro stepping motor (6026) to the fixing plate (6021); The fixing plate (6021) is provided with a through hole, the diameter of which is larger than the diameter of the SMA threaded head of the optical fiber (9) light output head; one side of the fixing plate (6021) is provided with a micro-stepping motor (6026) with a gear mounted on its output shaft and two gears (6025); the two gears (6025) are located at the upper and lower sides of the micro-stepping motor (6026) and mesh with the gears on the output shaft of the micro-stepping motor (6026); the micro-stepping motor (6026) is fixed to the fixing plate (6021) via a motor fixing frame (6027); the other side of the fixing plate (6021) is provided with a group of multi-link mechanisms symmetrically mounted above and below the through hole, the multi-link mechanisms consisting of two micro-rotating rods (6023), two micro-telescopic rods (6022) and an elastic friction rod (6024); in a group of multi-link mechanisms, one of the micro-rotating rods (6023) is provided with a micro-telescopic rod (6022) and a micro-telescopic rod (6024). The rotating rod (6023) is connected to a gear (6025) installed on the back of the fixed plate (6021), and the two rotate together, and the other micro rotating rod (6023) rotates passively; the micro telescopic rod (6022) is inserted into the micro rotating rod (6023), and a thrust spring is provided in the micro rotating rod (6023), so that the micro telescopic rod (6022) always has an elastic thrust when it is extended and retracted in the micro rotating rod (6023); a serrated rubber pad is attached to the lower part of the elastic friction rod (6024), and hinges are provided at both ends of the elastic friction rod (6024), which are connected to the ends of the micro telescopic rod (6022), and the two can rotate with each other at the position of the hinge; the SMA threaded head of the optical fiber (9) outlet head passes through the through hole opened on the fixed plate (6021) and is clamped by the two elastic friction rods (6024).

7. The gas expansion laser induced fluorescence detection device with self-adjusting optical path according to claim 5, characterized in that: The optical fiber collimator (605) comprises: a gear threaded cylinder (6051) driving a lens mounting cylinder (6054) to move left and right, a collimating lens (6052) for collimating divergent light emitted by the optical fiber (9), a lens pressing 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 mounting frame (604) is provided with an SMA threaded head for fixing the optical fiber (9) light output head, and a cylinder with fine pitch positive external threads is coaxially provided on the back of the SMA threaded column; a groove for mounting the collimator lens (6052) is provided on one side of the lens mounting cylinder (6054), and a fine pitch reverse external threads are provided on the other side; the gear threaded cylinder (6051) is a cylindrical structure with a gear on the outer surface, the front half of the inner surface of which is provided with fine pitch positive internal threads, which mesh with the fine pitch positive external threads of the cylinder on the collimator cage mounting frame (604), and the rear half is provided with fine pitch reverse internal threads, which mesh with the fine pitch reverse external threads on the lens mounting cylinder (6054); the outer side of the cylinder with fine pitch positive external threads on the collimator cage mounting frame (604) is provided with a sliding groove that matches the inner side of the lens mounting cylinder (6054), so that the two can slide left and right.

8. The gas expansion laser induced fluorescence detection device with self-adjusting optical path according to claim 5, characterized in that: The automatic adjustment beam splitter (16) comprises: a forty-five degree cage-type mirror frame (1601), a forty-five degree motor mounting frame (1602) for fixing the electric adjuster (17) to the forty-five degree cage-type mirror frame (1601), and an electric adjuster (17) for controlling the automatic rotation of a knob on the forty-five degree cage-type mirror frame (1601); A second beam splitter is installed in the forty-five degree cage mirror frame (1601), and the second beam splitter is used to split the collimated light beam output from the automatic adjustment collimator (6); the forty-five degree cage mirror frame (1601) is connected to the collimator cage mounting frame (604); there are two electric regulators (17) installed on the automatic adjustment beam splitter (16), which are respectively installed on two adjustment knobs of the forty-five degree cage mirror frame (1601) and are used to adjust the deflection angle of the second beam splitter, and both are fixed to the forty-five degree cage mirror frame (1601) through the forty-five degree motor mounting frame (1602).

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

10. The gas expansion laser induced fluorescence detection device with self-adjusting optical path according to claim 1, characterized in that: The light source module comprises: a laser (12) that emits light that can cause an active intermediate to generate fluorescence, and a first beam splitter (13); the first beam splitter (13) is used to split 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 measuring module comprises: a fluorescence pool (2) for intersecting a collimated light beam with a sampling airflow and generating fluorescence, a sampling nozzle (1) for generating a high-speed jet of ambient air carrying active intermediates, and an optical arm (5) for reducing stray light around the collimated light beam; The sampling nozzle (1) is a conical structure with a small hole on the top, the sampling nozzle (1) is located above the fluorescent pool (2) and the top of the cone is far away from the fluorescent pool (2); optical arms (5) are installed on both the left and right sides of the fluorescent pool (2), and a vacuum pump is connected below the fluorescent pool (2); wherein the collimated light beam output from the automatic adjustment collimator (6) enters the fluorescent pool (2) through the right optical arm (5), and after the collimated light beam intersects with the active intermediate in the fluorescent pool (2) to generate fluorescence, it is emitted from the left optical arm (5); The outer end of the optical arm (5), i.e., the end away from the fluorescent pool (2), is equipped with a window sheet for sealing the cavity and allowing laser light to pass through, and a plurality of conical apertures are installed inside the optical arm (5); a photomultiplier tube is installed on the back of the fluorescent pool (2).

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

13. A gas expansion laser induced fluorescence detection method with self-adjusting optical path, characterized in that: The method for automatically replacing the optical fiber in the gas expansion laser induced fluorescence detection device with self-adjusting optical path as described in claim 4 above comprises the following steps: S11, the monitoring control system monitors the first laser energy emitted from the sampling and measuring module, the second laser energy emitted from the light source module, and the third laser energy emitted from the automatic adjustment collimator (6), and when the third laser energy is less than 1 / 4 of the second laser energy, the next optical fiber (9) is selected as a new transmission optical fiber through the optical fiber automatic coupler (10); S12, automatically adjusting the collimator (6) to dismantle the light output head of the old transmission optical fiber currently fixed; S13, the steering gear (7010) of the automatic optical fiber changer (7) rotates, so that the slide (705) drives the optical fiber fixing clamp (701) on the second rotating disk (702) to move close to the automatic adjustment collimator (6), so that the optical fiber fixing clamp (701) squeezes and clamps the light output neck of the old transmission optical fiber through the clamping hole with a chamfered angle provided on the cylindrical hole, and the steering gear (7010) rotates again, so that the slide (705) drives the second rotating disk (702) to move away from the automatic adjustment collimator (6), so that the old transmission optical fiber clamped by the optical fiber fixing clamp (701) is separated from the optical fiber fixer (602); S14, rotating the second rotating disk (702) of the automatic optical fiber changer (7) to align the light output end of the new transmission optical fiber with the input end of the automatic adjustment collimator (6); S15, the steering gear (7010) of the automatic optical fiber changer (7) rotates, so that the slide (705) drives the new transmission optical fiber light outlet head on the second rotating disk (702) to move close to the automatic adjustment collimator (6), and the new transmission optical fiber light outlet head is inserted into the automatic adjustment collimator (6); S16, automatically adjusting the collimator (6) to fix the new transmission optical fiber light output head; S17, the steering gear (7010) of the automatic optical fiber changer (7) rotates, causing the slide (705) to drive the second rotating disk (702) to move away from the automatic adjustment collimator (6), so that the new transmission optical fiber light output head is detached from the optical fiber fixing clamp (701).

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