A spectrometer with a dual-frame opto-mechatronic integrated structure

Abstract

The present invention relates to a spectrometer with a dual-frame opto-mechatronic integrated structure, applicable to spectrometers that use filters for spectral splitting, especially near-infrared spectrometers for on-line analysis, belonging to the field of spectrometers. It is mainly composed of two main structures, namely an electro-mechanical spectral splitting and modulation frame and an opto-electronic frame, which are organically combined. The electro-mechanical spectral splitting and modulation frame includes a main frame, a spectral splitting and modulation mechanism, and a sampling mirror; the opto-electronic frame consists of two upper and lower circuit boards, two middle and bottom side frames, a light source and a sampling illumination system, and a sensor component. After the combination of the two frames, it meets the optical path requirements for spectrometer illumination and sampling, with a neat, simple, strong, and compact structure, facilitating installation, debugging, and fault detection, and is especially suitable for on-line real-time detection of materials on the production line.

Description

Technical Field

[0001] The present invention relates to a spectrometer with a dual-frame opto-mechatronic integrated structure, applicable to spectrometers that use filters for spectroscopy, especially near-infrared spectrometers for on-line analysis, and belongs to the field of spectrometers. Background Art

[0002] Filter-based spectrometers use narrow-band filters with multiple characteristic center wavelengths for spectroscopy. They have a simple structure, good stability, and high cost performance, and are widely used in industrial and agricultural production processes. Their structure consists of a light source, a spectroscopy system, a sampler, a sensor, a conversion and amplification processing circuit, a controller circuit, a power supply module, etc., including three parts: an optical path, a circuit, and a mechanical structure.

[0003] Currently, the products of filter-based spectrometers usually have these three parts separated into independent modules. The structural layout is scattered, especially the wiring of the circuit part is numerous, which is not convenient for production installation and debugging, and it is difficult to detect faults when they occur. Summary of the Invention

[0004] Aiming at the problems existing in the structure of the above-mentioned existing filter-based spectrometers, the present invention provides a dual-frame structure with an integrated opto-mechatronic structure, which is neat, simple, strong, and compact, and is convenient for installation, debugging, and fault detection.

[0005] The present invention is implemented as follows. A spectrometer with a dual-frame opto-mechatronic integrated structure includes an upper housing, a lower housing, an opto-electronic frame, and an electro-mechanical spectroscopy modulation frame. An opto-electronic frame is arranged between the upper housing and the lower housing. The opto-electronic frame includes a circuit board arranged between the upper housing and the lower housing. The electro-mechanical spectroscopy modulation frame includes a main frame, a spectroscopy modulation mechanism, and a sampling mirror structure. The main frame is arranged on the lower housing and partially passes through the circuit board. The spectroscopy modulation mechanism is fixed in the main frame, and the sampling mirror structure is fixed outside the main frame.

[0006] Further, the main frame includes two long side frames with different heights and two short side frames with the same height. The two long side frames with different heights are parallel to each other, and the two short side frames with the same height are parallel to each other. The spectroscopy modulation mechanism is fixed on the shorter long side frame. The upper edge of the taller long side frame passes through the circuit board into the upper housing and is fixed to the sampling mirror outward by screws. There are symmetrically distributed fixing screw holes on the upper surfaces of the two short side frames with the same height for fixing to the opto-electronic frame. The bottom surface of the main frame is flat and contacts the inner surface of the lower housing of the spectrometer.

[0007] Further, the beam splitting and modulation mechanism includes a speed stabilizing motor fixed on the long side frame of the main frame, a photoelectric switch with a groove, and a filter modulation disk. The filter modulation disk is connected to the output shaft of the speed stabilizing motor through a shaft sleeve and fastening screws. N filter plates are evenly installed on the filter modulation disk. There is 1 slit at the corresponding position of the disk edge of each filter plate, and one of the slits is wider than the others. The edge of the filter modulation disk is located in the groove of the photoelectric switch.

[0008] Further, the sampling mirror structure includes a mounting frame and a spherical mirror bonded inside the mounting frame.

[0009] Further, there are two diaphragms, front and rear, respectively, at the lower parts of the two long side frames of the main frame. Their centers are coaxial with the centers of the filter plates on the filter modulation disk. The axis of the speed stabilizing motor is parallel to this axis, and the optical axis of the sampling mirror is perpendicular to this axis.

[0010] Further, the circuit board includes an upper circuit board and a lower circuit board. There is an intermediate frame between the upper circuit board and the lower circuit board, and a bottom frame is below the lower circuit board. A light source component, a sampling illumination system, and a sensor are fixed on the lower circuit board.

[0011] Further, the upper circuit board is respectively provided with a power interface, a communication interface, a motor interface, a light source interface, a preamplifier circuit, a band-pass filter circuit, a data acquisition and control circuit, a DC motor speed stabilizing circuit, a light source power supply circuit, and an upper circuit board bus interface; the lower circuit board is respectively provided with a sensor interface, an optocoupler interface, a reference signal conditioning circuit, a power module, and a lower circuit board bus interface; the circuit connection method in the circuit board is as follows: each circuit in the same circuit board is connected through the wiring of the circuit board. The upper circuit board and the lower circuit board are connected by the pins of the upper circuit board bus interface and the lower circuit board bus interface. The upper circuit board bus interface and the lower circuit board bus interface are connected to all circuits and power interfaces of the system; the pins of the sensor are welded to the sensor interface and are sequentially connected to the preamplifier circuit, the band-pass filter circuit, and the data acquisition and control circuit through the upper circuit board bus interface, and are connected to the upper computer through the communication interface and the signal interface of the lower housing. The reference signal conditioning circuit is respectively connected to the photoelectric switch through the optocoupler interface and to the data acquisition and control circuit through the upper circuit board bus interface. The DC motor speed stabilizing circuit is connected to the motor through the motor interface and is connected to the power module through the upper circuit board bus interface and the lower circuit board bus interface. The light source power supply circuit is connected to the lamp socket wire through the light source interface. The input of the power module is connected to the external power interface and the external power through the upper circuit board bus interface, the lower circuit board bus interface, and the power interface, and the output is connected to each circuit in the upper circuit board and the lower circuit board.

[0012] Furthermore, the upper circuit board and the lower circuit board have the same outer dimensions and shape, with uniformly distributed through holes at the edges and one rectangular hole in the middle: the long side dimension of the rectangular hole is equal to the inner dimension of the long border of the main frame of the electro-mechanical spectral modulation frame, and the short side dimension is equal to the outer dimension of the short border of the main frame of the electro-mechanical spectral modulation frame. There are through holes beside the short side of the rectangular hole, and the positions are the same as those of the screw holes on the upper surface of the short border of the main frame of the electro-mechanical spectral modulation frame; there are a position adjustment slot and a position fixing slot for the light source respectively at the back of the upper and lower circuit boards, and there is one sampling hole respectively at the front of the upper and lower circuit boards. The sampling hole on the upper circuit board is a round hole, and the sampling hole on the lower circuit board is an annular hole with a connecting strip and a central circle. The diameter of the central circle is equal to the outer diameter of the sampling illumination system, and there are uniformly distributed fixing through holes on it;

[0013] The dimensions and structures of the middle border and the bottom border are the same as those of the edges of the upper and lower circuit boards, and there are uniformly distributed through holes and screw holes or through holes at the same positions respectively, which are placed in the middle and below the upper and lower circuit boards respectively.

[0014] Furthermore, the light source component is fixed at the position of the light source position fixing slot on the lower circuit board with screws, and includes a tungsten halogen lamp, a lamp holder and a light source lens. The tungsten halogen lamp, the lamp holder and the light source lens are respectively fixed in a fixing frame. There is a light outlet connection in front of the fixing frame. The center of the filament of the tungsten halogen lamp is located on the optical axis of the light source lens, and the distance from the light source lens is equal to the focal length of the light source lens. The wire of the lamp holder is connected to the light source interface on the upper circuit board.

[0015] Furthermore, the sampling illumination system includes an illumination cylinder and a reflection prism and an illumination lens built therein. The light inlet and the light outlet on the illumination cylinder form a 45° angle. The center of the light inlet is on the optical axis of the light source lens. The optical axis of the light source lens is perpendicular to the optical axis of the illumination lens, and the intersection point is on the reflection surface of the reflection prism;

[0016] The sensor component includes a lower fixing cylinder and an upper adjusting cylinder equipped with a sensor. The lower fixing cylinder and the illumination cylinder of the sampling illumination system are respectively fixed on the upper and lower surfaces of the central circle of the sampling hole on the lower circuit board with screws. The signal wire of the sensor is connected to the sensor interface on the lower circuit board.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention is organically composed of two main structures, namely an electro-mechanical spectral modulation frame and an optoelectronic frame. The structure is neat, simple, strong and compact, which is convenient for installation, debugging and fault detection, and is especially suitable for on-line real-time detection of materials on the production line, providing a basis for real-time quality control of production. Description of the Drawings

[0018] Figure 1 It is a front view of the spectrometer structure with a dual-frame structure integrating opto-mechanical structure;

[0019] Figure 2Top view of the structure of a spectrometer with a dual-frame structure integrating opto-mechatronic structures

[0020] Figure 3 Structural diagram of the filter modulation disk

[0021] Figure 4 Structural and circuit layout diagram of the upper circuit board

[0022] Figure 5 Structural and circuit layout diagram of the lower circuit board

[0023] Figure 6 Principle block diagram of the circuit board

[0024] Among them, 1 is the opto-mechanical spectroscopy modulation frame; 2 is the optoelectronic frame; 3 is the upper housing; 4 is the main frame; 5 is the spectroscopy modulation mechanism; 6 is the sampling mirror; 7 is the sensor; 8 is the upper adjustment cylinder; 9 is the lower fixed cylinder; 10 is the signal interface; 11 is the external power supply interface; 12 is the sampling window; 13 is the object to be measured; 14 is the sampling illumination system; 15 is the illumination lens; 16 is the reflecting prism; 17 is the illumination cylinder; 18 is the front aperture; 19 is the optoelectronic switch; 20 is the rear aperture; 21 is the light source base; 22 is the light source lens; 23 is the wire; 24 is the lamp holder; 25 is the light bulb; 26 is the lower housing; 27 is the light source component; 28 is the bottom frame; 29 is the lower circuit board; 30 is the middle frame; 31 is the upper circuit board; 32 is the filter modulation disk; 33 is the filter; 34 is the positioning hole; 35 is the bushing; 36 is the first sampling hole; 37 is the second sampling hole; 38 is the connecting band; 39 is the position fixing groove and position adjustment groove; 40 is the constant speed motor; 41 is the filter slit; 42 is the bus interface of the upper circuit board; 43 is the first through hole; 44 is the second through hole; 45 is the data acquisition and control circuit; 46 is the DC motor speed stabilization circuit; 47 is the communication interface; 48 is the power supply interface; 49 is the light source power supply circuit; 50 is the light source interface; 51 is the motor interface; 52 is the preamplifier circuit; 53 is the band-pass filter circuit; 54 is the bus interface of the lower circuit board; 55 is the central circle; 56 is the sensor interface; 57 is the optocoupler interface; 58 is the power module; 59 is the reference signal conditioning circuit; 60 is the third through hole. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Taking the moisture meter as an example, the structural diagrams of the spectrometer with a dual-frame structure integrating opto-mechatronic structures are as shown in Figure 1 and Figure 2 and include an opto-mechanical spectroscopy modulation frame 1 and an optoelectronic frame 2. The two main structures of the opto-mechanical spectroscopy modulation frame 1 and the optoelectronic frame 2 are organically combined and fixed to the installation groove of the lower housing 26 with screws through the lower circuit board 29 of the optoelectronic frame. The upper housing 3 is connected to the lower housing 26 with screws.

[0027] The electro-mechanical spectral modulation framework 1 includes a main framework 4, a spectral modulation mechanism 5, and a sampling mirror 6. The main framework 4 is in an irregular rectangle shape, including two long frames with one being tall and the other being short, and two short frames of the same height. The short long frame is internally fixed with the spectral modulation mechanism 5; the upper edge of the tall long frame is externally fixed with the sampling mirror 6 by screws; there are screw holes on the upper top surfaces of the two short frames of the same height and they are fixedly connected to the optoelectronic framework 2 by screws. The bottom surface of the main framework is flat and contacts the inner surface of the lower housing 26 of the spectrometer. The spectral modulation mechanism 5 includes a constant-speed motor 40 and a photoelectric switch 19 fixed on the short long frame of the main framework, and a filter modulation disk 32 fixed on the output shaft of the constant-speed motor. The structure of the filter modulation disk 32 is as Figure 2 shown. The filter modulation disk is connected to the electro-mechanical spectral modulation framework 1 through a bushing 35. The filter modulation disk 32 is evenly installed with 3 filter plates 33. Refer to Figure 3 . There is 1 slit 41 at the corresponding position on the disk edge of each filter plate. The edge of the filter modulation disk 32 is located in the slot of the photoelectric switch 19. There are respectively two front and rear diaphragms on the lower parts of the two long frames, namely the front diaphragm 18 and the rear diaphragm 20. Their centers are coaxial and pass through the central circle of the filter plates on the filter modulation disk 32.

[0028] The sensor component includes a lower fixing cylinder 9 and an upper adjusting cylinder 8 equipped with a sensor. The lower fixing cylinder and the illumination cylinder of the sampling illumination system are respectively fixed on the upper and lower surfaces of the central circle of the sampling hole on the lower circuit board by screws. The signal wire of the sensor is connected to the sensor interface on the lower circuit board.

[0029] Refer to Figure 4 and Figure 5, the optoelectronic frame 2 includes two upper and lower circuit boards, an upper circuit board 31 and a lower circuit board 29, a middle frame and a bottom frame 28, a light source component 27, a sampling illumination system 14, and a sensor 7. The outer dimensions and shapes of the upper and lower circuit boards are the same. The long-edge edge of the upper circuit board 31 has a second through hole 44 for fixing, and the short-edge edge has a first through hole 43 for fixing. There is a rectangular hole in the middle: the long-side dimension is equal to the inner dimension of the long border of the main frame 4 of the electromechanical spectroscopic modulation frame 1, and the short-side dimension is equal to the outer dimension of the short border of the main frame 4 of the electromechanical spectroscopic modulation frame 1; there is a positioning hole 34 beside the short side of the rectangular hole, and the position is the same as the position of the screw hole on the upper top surface of the short border of the main frame 4; there are a position adjustment slot and a position fixing slot 39 for the light source component 27 behind the upper and lower circuit boards respectively; there is one sampling hole on the front of the upper and lower circuit boards respectively, which are the first sampling hole 36 and the second sampling hole 37: the first sampling hole 36 on the upper circuit board is a round hole, and the second sampling hole 37 on the lower circuit board is an annular hole with a connecting band 38. The diameter of the central circle 55 of the second sampling hole 37 is equal to the outer diameter of the sampling illumination system 14; there are evenly distributed fixing through holes on the central circle 55, and the sensor 7 and the sampling illumination system 14 are placed on the upper and lower sides respectively and fixed together with screws. The light source component 27 is fixed to the light source position of the lower circuit board 29 with screws, and the periphery of the lower circuit board has third through holes 60 for fixing.

[0030] See Figure 6 , the circuit connection methods in the upper and lower circuit boards are as follows: Each circuit in the same circuit board is connected through the wiring of the circuit board. The upper and lower circuit boards are connected through the pins of the upper circuit board bus interface 42 and the lower circuit board bus interface 54. The upper circuit board bus interface 42 and the lower circuit board bus interface 54 are connected to all circuits of the system and the external power interface 11; the pins of the sensor 7 are welded to the sensor interface 56 and are sequentially connected to the preamplifier circuit 52, the band-pass filter circuit 53, and the data acquisition control circuit 45 through the upper circuit board bus interface 42, and are connected to the upper computer through the communication interface 47 and the signal interface 10 of the lower housing. The reference signal conditioning circuit 59 is respectively connected to the optoelectronic switch 19 through the optocoupler interface 57 and to the data acquisition control circuit 45 through the upper circuit board bus interface 42. The DC motor speed stabilization circuit 46 is connected to the motor through the motor interface 51 and is connected to the power supply module 58 through the upper circuit board bus interface 42 and the lower circuit board bus interface 54. The light source power supply circuit 49 is connected to the wire 23 of the lamp holder through the light source interface 50. The power supply module 58 is connected to the external power interface 11 through the upper circuit board bus interface 42, the lower circuit board bus interface 54, and the power interface 48 and is connected to the external power supply, and the output is connected to each circuit in the upper and lower circuit boards.

[0031] The middle frame 30 and the bottom frame 28 have the same size and structure as the edges of the upper and lower circuit boards. Through holes and screw holes are evenly distributed respectively, and they are placed in the middle and below the upper and lower circuit boards respectively and fixed with screws. The light source component 27 is composed of a light source base 21, a built-in light bulb 25, a lamp holder 24 and a light source lens 22. The light bulb 25 is fixed on the lamp holder 24, and its center is coaxial with the optical axis of the light source lens 22 and the center of the light outlet of the light source base 21; the sampling illumination system 14 is composed of an illumination cylinder 17, a built-in reflecting prism 16 and an illumination lens 15. The light inlet and the light outlet on the illumination cylinder 17 form a 45° angle; the optical axis of the light source lens 22 is coaxial with the optical axis of the illumination lens 15 after being reflected by the reflecting prism 16.

[0032] Before installing the sampling mirror 6 on the electro-mechanical spectroscopic modulation frame 1, place its two long frames, one high and one low, in the middle rectangular hole of the optoelectronic frame 2, and place its two short frames of equal height below the middle rectangular hole of the optoelectronic frame 2. Align the screw holes with the positioning holes 34 and fix them by screw connection, and then install the sampling mirror 6. After installation, the center of the light outlet of the light source component 27, the centers of the front and rear diaphragms on the electro-mechanical spectroscopic modulation frame, and the center of the incident port of the sampling illumination system 17 are all on the optical axis of the light source lens 22, and the optical axis of the light source lens 22 vertically passes through the center arc of the filter 33 on the filter modulation disk 32; the center of the sampling window 12 of the lower housing, the center of the sampling mirror 6, and the center of the sensor 7 are all on the optical axis of the illumination lens 15 of the sampling illumination system 14. The light source component 27 illuminates the object to be measured 13 through the sampling illumination system 14 and the sampling window of the lower housing 26. The illuminated object to be measured 13 and the photosensitive surface of the sensor 7 are respectively located at the object and image positions of the sampling mirror 6, ensuring that the illuminated area of the object to be measured 13 has effective light spots on the photosensitive surface of the sensor 7 within the effective measurement distance range.

[0033] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A spectrometer with a dual-frame opto-mechatronic integrated structure, characterized in that, It includes an upper housing, a lower housing, an optoelectronic frame, and an electromechanical spectral modulation frame. An optoelectronic frame is arranged between the upper housing and the lower housing. The optoelectronic frame includes a circuit board disposed between the upper housing and the lower housing. The electromechanical spectral modulation frame includes a main frame, a spectral modulation mechanism, and a sampling mirror structure. The main frame is disposed on the lower housing and partially passes through the circuit board. The spectral modulation mechanism is fixed in the main frame, and the sampling mirror structure is fixed outside the main frame; The main frame includes two long side frames with different heights and two short side frames with the same height. The two long side frames with different heights are parallel to each other. The two short side frames with the same height are parallel to each other. The spectral modulation mechanism is fixed on the shorter long side frame. The upper edge of the taller long side frame passes through the circuit board into the upper housing and is fixed outside by screws with a sampling mirror. There are symmetrically distributed fixing screw holes on the top surfaces of the two short side frames with the same height for fixing with the optoelectronic frame. The bottom surface of the main frame is flush and contacts the inner surface of the lower housing of the spectrometer; The spectral modulation mechanism includes a constant-speed motor fixed on the shorter long side frame of the main frame, a grooved optoelectronic switch, and a filter modulation disk. The filter modulation disk is composed of a shaft sleeve and is connected to the output shaft of the constant-speed motor by a fastening screw. N filter plates are evenly installed on the filter modulation disk. There is 1 slit at the corresponding position of the disk edge of each filter plate. One of the slits is wider than the others. The edge of the filter modulation disk is in the groove of the optoelectronic switch; There are two diaphragms, front and rear, respectively, at the lower parts of the two long side frames of the main frame. Their centers are coaxial with the centers of the filter plates on the filter modulation disk. The axis of the constant-speed motor is parallel to the axis of the filter modulation disk. The optical axis of the sampling mirror is perpendicular to the axis of the filter modulation disk.

2. The spectrometer according to claim 1, characterized in that, The sampling mirror structure includes a mounting frame and a spherical mirror bonded in the mounting frame.

3. The spectrometer according to claim 1, characterized in that, The circuit board includes an upper circuit board and a lower circuit board. The middle frame is between the upper circuit board and the lower circuit board. The bottom frame is below the lower circuit board. A light source component, a sampling illumination system, and a sensor are fixed on the lower circuit board.

4. The spectrometer according to claim 3, characterized in that The upper circuit board is respectively provided with a power interface, a communication interface, a motor interface, a light source interface, a preamplifier circuit, a band-pass filter circuit, a data acquisition and control circuit, a DC motor speed stabilization circuit, a light source power supply circuit, and an upper circuit board bus interface; the lower circuit board is respectively provided with a sensor interface, an optocoupler interface, a reference signal conditioning circuit, a power supply module, and a lower circuit board bus interface; the circuit connection mode in the circuit board is as follows: each circuit in the same circuit board is connected through the wiring of the circuit board, and the upper circuit board and the lower circuit board are connected through the pins of the upper circuit board bus interface and the lower circuit board bus interface. The upper circuit board bus interface and the lower circuit board bus interface are connected to all circuits and power interfaces of the system; the pins of the sensor are welded to the sensor interface and are sequentially connected to the preamplifier circuit, the band-pass filter circuit, and the data acquisition and control circuit through the upper circuit board bus interface, and are connected to the host computer through the communication interface and the signal interface of the lower housing. The reference signal conditioning circuit is respectively connected to the optoelectronic switch through the optocoupler interface and to the data acquisition and control circuit through the upper circuit board bus interface. The DC motor speed stabilization circuit is connected to the motor through the motor interface and is connected to the power supply module through the upper circuit board bus interface and the lower circuit board bus interface. The light source power supply circuit is connected to the lamp socket wire through the light source interface. The input of the power supply module is connected to the external power interface and the external power supply through the upper circuit board bus interface, the lower circuit board bus interface, and the power interface, and the output is connected to each circuit in the upper circuit board and the lower circuit board.

5. The spectrometer according to claim 4, characterized in that, The outer dimensions and shapes of the upper circuit board and the lower circuit board are the same. There are uniformly distributed through holes on the edge and a rectangular hole in the middle: the long side dimension of the rectangular hole is equal to the inner dimension of the long border of the main frame of the electromechanical spectro-modulation frame, and the short side dimension is equal to the outer dimension of the short border of the main frame of the electromechanical spectro-modulation frame. There is a through hole beside the short side of the rectangular hole, and its position is the same as the position of the screw hole on the upper surface of the short border of the main frame of the electromechanical spectro-modulation frame; there are respectively a position adjustment slot and a position fixing slot for the light source on the back of the upper and lower circuit boards. There is one sampling hole on the front of the upper and lower circuit boards respectively. The sampling hole on the upper circuit board is a round hole, and the sampling hole on the lower circuit board is an annular hole with a connecting band and a central circle. The diameter of the central circle is equal to the outer diameter of the sampling illumination system, and there are uniformly distributed fixing through holes on it; The dimensions and structures of the middle border and the bottom border are the same as those of the edges of the upper and lower circuit boards. There are uniformly distributed through holes and screw holes or through holes at the same positions respectively, and they are respectively placed in the middle and below the upper and lower circuit boards.

6. The spectrometer according to claim 4, characterized in that, The light source component is fixed at the position of the light source position fixing slot on the lower circuit board by screws, and includes a tungsten halogen lamp, a lamp socket, and a light source lens. The tungsten halogen lamp, the lamp socket, and the light source lens are respectively fixed in a fixing frame. There is a light output connection in front of the fixing frame. The center of the filament of the tungsten halogen lamp is located on the optical axis of the light source lens, and the distance from the light source lens is equal to the focal length of the light source lens. The wire of the lamp socket is connected to the light source interface of the upper circuit board.

7. The spectrometer according to claim 6, characterized in that, The sampling illumination system includes an illumination cylinder, a reflection prism and an illumination lens disposed therein. The light inlet and the light outlet on the illumination cylinder form an angle of 45°. The center of the light inlet is on the optical axis of the light source lens. The optical axis of the light source lens is perpendicular to the optical axis of the illumination lens, and the intersection point is on the reflection surface of the reflection prism. The sensor component includes a lower fixing cylinder and an upper adjusting cylinder equipped with a sensor. The lower fixing cylinder and the illumination cylinder of the sampling illumination system are respectively fixed on the upper and lower surfaces of the central circle of the sampling hole on the lower circuit board with screws. The signal line of the sensor is connected to the sensor interface on the lower circuit board.

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