A spatial light modulation measurement device

Abstract

The invention discloses a spatial light modulation measuring device, which relates to the technical field of material detection devices, and comprises a light source for providing illumination. A high-definition camera, a grating plate and a light source are sequentially designed from top to bottom, so as to form a specific optical path design and image processing technology. No special processing is required for the sample, and it is sufficient as long as the lower surface of the sample is in close contact with the surface of the grating plate. This greatly simplifies the sample preparation process and reduces the error caused by the preparation. An approximate numerical solution of a radiation conduction equation is obtained by using a Monte Carlo method, and the modulation depths at different spatial modulation frequencies obtained by experiment are compared with simulation results. The reduced scattering coefficient and absorption coefficient of the material can be obtained at the same time, which not only improves the measurement accuracy, but also improves the measurement efficiency through automatic image processing and data analysis. The invention has a wide range of applications, can measure the optical properties of multiple scattering materials, and has broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of material detection devices, and in particular to a spatial light modulation measurement device. Background Art

[0002] In the fields of materials science and biomedicine, it is very important to understand the optical properties of materials. During the transmission process, light is absorbed and scattered by the medium. The absorption coefficient, scattering coefficient, scattering phase function and beam attenuation coefficient of the medium are its inherent optical properties. These properties do not change with the distribution and intensity of the incident light field. Traditional methods for measuring the optical properties of materials include photometry, which is a method of quantitative analysis based on the degree of light attenuation of the material. Photometry can achieve high sensitivity and is particularly suitable for the determination of trace components. The determination of trace components has reached the order of 1 to 10 μg / L. The measurement principle of photometry is as follows: Figure 1 As shown, in the case of absorption only ( Figure 1 (a)), after passing through a certain thickness (dr) of the medium, the incident beam flux loses dΦab, and the scattering coefficient a is: a = -dΦab / Φi ndr. In the case of only scattering ( Figure 1 (b)), after passing through the thin layer of medium, the flux loss of the light beam is dΦsc, and the scattering coefficient b can be defined as: b = -dΦsc / Φi ndr.

[0003] Traditional photometry ( Figure 1 ) cannot distinguish the contribution of absorption and scattering to the attenuation process of transmitted light, and is generally only suitable for the analysis of pure absorbing or pure scattering materials. For pure scattering materials, the thickness of the sample should be small enough to avoid multiple scattering during photometric measurement. Therefore, for strongly scattering materials, the sample often needs to be made very thin (even to the micron level), which makes sample preparation difficult. In addition, the sample preparation process may cause material damage and measurement errors caused by insufficient thickness control accuracy. For multiple scattering materials with both absorption and scattering, it is difficult to obtain accurate results using photometry. Summary of the invention

[0004] The object of the present invention is to provide a spatial light modulation measurement device to solve the technical problems mentioned in the above background technology.

[0005] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0006] A spatial light modulation measurement device includes a light source for providing illumination;

[0007] It also includes an experimental box for storing the light source, wherein a partition plate is arranged inside the experimental box, a light path groove matching the light source is opened in the middle of the partition plate, a grating plate for separating the light is arranged on the top of the partition plate, and a high-definition camera for shooting is arranged on the inner top of the experimental box;

[0008] The bottom of the experimental box is symmetrically provided with threaded columns, and the tops of the threaded columns are connected to the partition plate. The threaded columns are symmetrically distributed on both sides of the optical path groove. The threaded columns are provided with a clamping assembly that can be lifted up and down and is used to fix the light source;

[0009] Among them, the clamping assembly includes a lifting seat, a threaded sleeve seat is rotatably provided on the lifting seat and is threadedly connected to the threaded column, a plurality of groups of equally spaced gear teeth are provided on the circumferential outer edge of the threaded sleeve seat, an inner gear sleeve is provided on the outer sliding sleeve of the threaded sleeve seat and meshes with the gear teeth, and the inner gear sleeve can move up and down along the outer surface of the threaded sleeve seat, a T-shaped frame is movably provided on the side of the lifting seats close to each other, and a plurality of groups of spaced-apart gear grooves are provided on the side of the T-shaped frame close to the lifting seats, a No. 1 threaded shaft is movably provided on the side of the T-shaped frame close to each other, a clamping plate for clamping the light source is provided at one end of the No. 1 threaded shaft, and a gasket is provided on the contact surface between the clamping plate and the light source.

[0010] As a further solution of the present invention: a bracket is provided on the top of the partition plate, and protrusions for supporting the grating plate are provided at both ends of the bracket, a fixing frame for supporting the high-definition camera is provided on the inner top of the experimental box, and card slots are symmetrically opened on the fixing frame, and a camera frame plate is provided on the high-definition camera, and the camera frame plate can be slidably inserted into the interior of the card slot.

[0011] As a further solution of the present invention: limit frames are arranged on both sides of the front of the experimental box, sealing plates are slidably arranged inside the limit frames, positioning plates are symmetrically arranged at both ends of the bottom of the grating plate, a positioning groove matching the positioning plate is opened on the top of the protrusion, and magnetic plates are arranged on the bottom end of the positioning plate and the bottom of the positioning groove, and the magnetism of the two magnetic plates facing each other is opposite.

[0012] As a further solution of the present invention: an interlayer cavity is provided inside the grating plate, and a plurality of groups of spaced grating grooves communicating with the interlayer cavity are provided through the top of the grating plate, and a No. 1 bidirectional screw is rotatably provided on both sides of the inside of the interlayer cavity, and a plurality of groups of spaced light-blocking plates are sleeved on the outer side of the No. 1 bidirectional screw, wherein the length of the light-blocking plates is greater than the length of the grating grooves, and the light-blocking plates are grouped in pairs for blocking the grating grooves.

[0013] As a further solution of the present invention: a No. 1 pulley connected to a No. 1 bidirectional screw is rotatably provided at both ends of one side of the grating plate, a No. 2 pulley is rotatably provided in the middle of one side of the grating plate where the No. 1 pulley is provided, and the diameter of the No. 2 pulley is larger than the diameter of the No. 1 pulley, the No. 1 pulley and the No. 2 pulley are synchronously rotated through a belt, a driving handle is provided on the No. 2 pulley, and a protective cover for protecting the No. 1 pulley and the No. 2 pulley is provided on one side of the grating plate.

[0014] As a further solution of the present invention: movable grooves for installing threaded sleeves are provided at both ends of the top of the lifting seat, an annular groove is provided on the bottom wall of the movable groove, and an annular seat matching the annular groove is provided at the bottom of the threaded sleeve.

[0015] As a further solution of the present invention: a support rod is arranged on the top of the lifting seat, a top plate is arranged on the top of the support rod, a circular groove matching the threaded column is opened on the top plate, guide columns are symmetrically arranged on the bottom of the top plate, and the guide columns are located on both sides of the circular groove, the bottom ends of the guide columns are connected to the lifting seat, and pull plates and springs are sleeved on the outer sides of the guide columns, and the pull plates are connected to the inner gear sleeve, the springs are located above the pull plates and squeeze the pull plates.

[0016] As a further solution of the present invention: an adjustment groove for sliding of the T-frame is provided on one side of the lifting seats that are close to each other, and three groups of built-in grooves are spaced apart on the side walls of the adjustment grooves, and the internal rotation of the built-in grooves is provided with limit teeth matching the tooth grooves, and the distance between the limit teeth is smaller than the length of the T-frame, and the top of the lifting seat is provided with positioning teeth connected to the limit teeth, and the lifting seat is provided with an anti-deflection piece for fixing the positioning teeth, and the anti-deflection piece is movably inserted on the lifting seat.

[0017] As a further solution of the present invention: a limiting axis is arranged on the splint, and the limiting axis is movably plugged into the T-frame, side panels are symmetrically arranged on the sides of the T-frame close to each other, and the side panels are located below the splint, a No. 2 threaded shaft and a stabilizing rod are arranged between the side panels, and the No. 2 threaded shaft is rotatably arranged, and the stabilizing rods are located on both sides of the No. 2 threaded shaft.

[0018] As a further solution of the present invention: the outer movable sleeve of the No. 2 threaded shaft and the stabilizing rod is provided with an auxiliary seat, the side of the auxiliary seats close to each other is provided with a sliding groove, the inner part of the sliding groove is provided with a No. 2 bidirectional screw rod for rotation, and the movable sleeves at both ends of the No. 2 bidirectional screw rod are provided with symmetrically distributed load frames, and the load frames support the light source from the bottom of it.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention forms a specific optical path design and image processing technology by sequentially designing a high-definition camera, a grating plate and a light source from top to bottom. No special processing is required for the sample, as long as the lower surface of the sample is in close contact with the surface of the grating plate. The sample preparation process is greatly simplified and the error caused by the preparation is reduced. The Monte Carlo method is used to obtain an approximate numerical solution to the radiation conduction equation, and the modulation depth at different spatial modulation frequencies obtained experimentally is compared with the simulation results. The reduced scattering coefficient and absorption coefficient of the material can be obtained at the same time, which not only improves the measurement accuracy, but also improves the measurement efficiency through automated image processing and data analysis. The invention has a wide range of applications and can measure the optical properties of multiple scattering materials, and has broad application prospects.

[0021] 2. In the present invention, the inner gear sleeve and the threaded sleeve seat are meshed with each other to fix the clamping assembly. When the inner gear sleeve is disengaged from the threaded sleeve, the threaded sleeve seat rotates normally, and the clamping assembly can move up and down along the threaded column to adjust the height of the light source. After the adjustment is completed, the spring can drive the inner gear sleeve to reset and mesh with the threaded sleeve seat again, thereby fixing the threaded sleeve seat. The adjustment method is fast and efficient, providing great convenience for the staff.

[0022] 3. In the present invention, the tooth grooves on the T-frame are meshed with the limit teeth. When the horizontal and vertical positions of the light source need to be adjusted, the T-frame can be pulled. Since the distances between the limit teeth are smaller than the length of the T-frame, the T-frame can always mesh with a group of limit teeth when moving, thereby further improving the stability when adjusting the T-frame and the adjustment accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the photometric method principle in the present invention;

[0025] Figure 2 It is a three-dimensional schematic diagram of the experimental box in the present invention;

[0026] Figure 3 It is a schematic diagram of the use state of the device in the present invention;

[0027] Figure 4 It is a schematic diagram of the overall structure of the device in the present invention;

[0028] Figure 5 The present invention Figure 4 The enlarged schematic diagram at A in the middle;

[0029] Figure 6 It is a schematic diagram of the structure of the grating plate in the present invention;

[0030] Figure 7It is a three-dimensional schematic diagram of the clamping assembly in the present invention;

[0031] Figure 8 It is a schematic diagram of the modulation depth calculated by Monte Carlo simulation when the grating period is 5 mm;

[0032] Fig. 9 It is a schematic diagram of the modulation depth calculated by Monte Carlo simulation when the grating period is 4 mm.

[0033] In the figure: 1. Experimental box; 2. Partition plate; 3. Optical path groove; 4. Bracket; 5. Fixing frame; 6. Card slot; 7. Camera frame; 8. High-definition camera; 9. Threaded column; 10. Limit frame; 11. Sealing plate; 12. Grating plate; 13. Positioning plate; 14. Positioning groove; 15. Magnetic plate; 16. Interlayer cavity; 17. Grating groove; 18. No. 1 bidirectional screw rod; 19. Light shield; 20. No. 1 pulley; 21. No. 2 pulley; 22. Belt; 23. Driving handle; 24. Lifting seat; 25. Movable groove; 26. Screw Sleeve seat; 27. Ring groove; 28. Ring seat; 29. ​​Internal gear sleeve; 30. Support rod; 31. Top plate; 32. Guide column; 33. Pull plate; 34. Spring; 35. Adjustment groove; 36. Built-in groove; 37. Limiting tooth; 38. Positioning tooth; 39. Anti-bias piece; 40. T-shaped frame; 41. No. 1 threaded shaft; 42. Limiting shaft; 43. Clamp; 44. Gasket; 45. Side plate; 46. No. 2 threaded shaft; 47. Stabilizer bar; 48. Auxiliary seat; 49. Slide; 50. No. 2 bidirectional screw; 51. Load frame. DETAILED DESCRIPTION

[0034] 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.

[0035] like Figure 2-7 As shown, a spatial light modulation measurement device includes a light source for providing illumination, wherein the light source provides a stable illumination beam, the diameter of the beam is usually more than several centimeters, and the spatial distribution of the intensity is uniform;

[0036] It also includes an experimental box 1 for storing a light source, a partition plate 2 is arranged inside the experimental box 1, a light path groove 3 matching the light source is opened in the middle of the partition plate 2, a grating plate 12 for separating light is arranged on the top of the partition plate 2, the grating plate 12 is used to place a sample of the material to be tested (such as fat emulsion, etc.), the lower surface of the sample should be in close contact with the upper surface of the grating plate 12, the grating plate 12 generally transmits or blocks the light flux periodically, and is used to spatially modulate the light source, the spatial period of the grating plate 12 is generally close to the sample thickness, and during the measurement process, it is usually necessary to use two or more gratings with different spatial frequencies, for example, for a sample with a thickness of 3 mm, the grating period used may be 4 mm and 5 mm, a high-definition camera 8 for shooting is arranged on the inner top of the experimental box 1, the high-definition camera 8 is located above the material sample and focused on the upper surface of the sample, and is used to shoot the intensity distribution diagram of the transmitted light after the spatially modulated light passes through the material to be tested;

[0037] The bottom of the experimental box 1 is symmetrically provided with threaded columns 9, and the top of the threaded columns 9 is connected to the partition plate 2, the threaded columns 9 are symmetrically distributed on both sides of the optical path groove 3, and the threaded columns 9 are provided with a clamping assembly that can be lifted up and down for fixing the light source, wherein the clamping assembly includes a lifting seat 24, a threaded sleeve 26 that is rotatably sleeved on the lifting seat 24 and is threadedly connected to the threaded column 9, a plurality of groups of gear teeth equidistantly distributed are provided on the circumferential outer edge of the threaded sleeve 26, an inner gear sleeve 29 that meshes with the gear teeth is provided on the outer sliding sleeve of the threaded sleeve 26, and the inner gear sleeve 29 can move up and down along the outer surface of the threaded sleeve 26, a support rod 30 is provided on the top of the lifting seat 24, and a A top plate 31 is provided with a circular groove matching the threaded column 9, a guide column 32 is symmetrically arranged at the bottom of the top plate 31, and the guide column 32 is located on both sides of the circular groove, the bottom end of the guide column 32 is connected to the lifting seat 24, a pull plate 33 and a spring 34 are sleeved on the outer side of the guide column 32, and the pull plate 33 is connected to the inner gear sleeve 29, the spring 34 is located above the pull plate 33, and squeezes the pull plate 33, a T-shaped frame 40 is movably arranged on the side of the lifting seat 24 close to each other, and a plurality of groups of spaced tooth grooves are opened on the side of the T-shaped frame 40 close to the lifting seat 24, a No. 1 threaded shaft 41 is movably arranged on the side of the T-shaped frame 40 close to each other, and one end of the No. 1 threaded shaft 41 A clamping plate 43 for clamping the light source is provided, and a gasket 44 is provided on the contact surface between the clamping plate 43 and the light source. The staff lifts the pull plate 33 upward, and the pull plate 33 moves upward along the guide column 32. At this time, the spring 34 is compressed, and the pull plate 33 drives the inner gear sleeve 29 to move upward, and the threaded sleeve seat 26 is separated from the inner gear sleeve 29. The staff can move the clamping assembly up and down along the threaded column 9. At this time, the threaded sleeve seat 26 rotates normally, so that the clamping assembly can move smoothly. When the staff lets go, the spring 34 can drive the pull plate 33 to reset, and because the pull plate 33 moves along the guide column 32, the friction between the two can buffer the rebound force of the spring 34. Thereby, the pull plate 33 can be reset smoothly, and the pull plate 33 is rotatably connected to the inner gear sleeve 29. When the pull plate 33 is reset, the inner gear sleeve 29 is meshed with the threaded sleeve seat 26 again, thereby fixing the threaded sleeve seat 26. It should be noted that the gear tooth spacing on the outer side of the threaded sleeve seat 26 is small (within two millimeters). Therefore, when there is an intersection between the inner gear sleeve 29 and the threaded sleeve seat 26 and they cannot be engaged, only slight adjustments are required. The clamping plate 43 can be adjusted by adjusting the No. 1 threaded shaft 41. The clamping plate 43 can be used to clamp and fix the light source. By adjusting the clamping plate 43, light sources of different specifications can be fixed, and the horizontal position of the light source can also be changed.

[0038] In this embodiment, specifically, a bracket 4 is provided on the top of the partition plate 2, and protrusions for supporting the grating plate 12 are provided at both ends of the bracket 4. A fixing frame 5 for supporting the high-definition camera 8 is provided on the inner top of the experimental box 1, and card slots 6 are symmetrically opened on the fixing frame 5. A camera frame plate 7 is provided on the high-definition camera 8, and the camera frame plate 7 can be slidably inserted into the interior of the card slot 6. The high-definition camera 8 is fixed in the card slot 6 opened on the fixing frame 5 through the camera frame plate 7, which is convenient for assembly and disassembly.

[0039] In the present embodiment, specifically, limit frames 10 are provided on both sides of the front of the experimental box 1, and sealing plates 11 are slidingly provided inside the limit frames 10. The sealing plates 11 form a seal on the experimental box 1, ensuring that the interior of the device can be in a dark environment when in use, thereby ensuring the smooth progress of the experiment. Positioning plates 13 are symmetrically provided at both ends of the bottom of the grating plate 12, and a positioning groove 14 matching the positioning plate 13 is provided on the top of the protrusion. A magnetic plate 15 is provided at the bottom end of the positioning plate 13 and the bottom of the positioning groove 14, and the two magnetic plates 15 have opposite magnetism on the sides facing each other. The positioning plate 13 is inserted into the positioning groove 14, and the two are magnetically fixed by the magnetic plate 15, which further ensures the stability of the grating plate 12 when placed.

[0040] In the present embodiment, specifically, an interlayer cavity 16 is provided inside the grating plate 12, and a plurality of groups of spaced grating grooves 17 communicating with the interlayer cavity 16 are provided on the top of the grating plate 12, and a first bidirectional screw 18 is rotatably provided on both sides of the inner part of the interlayer cavity 16, and a plurality of groups of spaced light-blocking plates 19 are sleeved on the outer side of the first bidirectional screw 18, and the length of the light-blocking plates 19 is greater than the length of the grating groove 17, and the light-blocking plates 19 are grouped in pairs for blocking the grating groove 17, and a first pulley 20 connected to the first bidirectional screw 18 is rotatably provided at both ends of one side of the grating plate 12, and a second pulley 21 is rotatably provided in the middle of one side of the grating plate 12 provided with the first pulley 20, and the second pulley 21 The diameter is larger than the diameter of the No. 1 pulley 20, and the No. 1 pulley 20 and the No. 2 pulley 21 form synchronous rotation through the belt 22. The No. 2 pulley 21 is provided with a driving handle 23, and a protective cover for protecting the No. 1 pulley 20 and the No. 2 pulley 21 is provided on one side of the grating plate 12. The staff drives the No. 2 pulley 21 to rotate through the driving handle 23, and the No. 2 pulley 21 drives the No. 1 pulley 20 to rotate through the belt 22, thereby the No. 1 bidirectional lead screw 18 rotates with the No. 2 pulley 21, and the No. 1 bidirectional lead screw 18 can synchronously drive two light-blocking plates 19 in a group to approach or move away from each other, thereby the light-transmitting area of ​​the grating groove 17 can be changed to meet the matching of different experimental sample thicknesses.

[0041] In this embodiment, specifically, movable grooves 25 for installing the threaded sleeve 26 are provided at both ends of the top of the lifting seat 24, an annular groove 27 is provided on the bottom wall of the movable groove 25, and an annular seat 28 matching the annular groove 27 is provided at the bottom of the threaded sleeve 26. When the threaded sleeve 26 rotates, the annular seat 28 provided at the bottom of the threaded sleeve 26 slides in the annular groove 27, thereby ensuring the stability of the threaded sleeve 26 during rotation.

[0042] In the present embodiment, specifically, an adjustment groove 35 for sliding of the T-shaped frame 40 is provided on one side of the lifting seat 24 close to each other, and three groups of built-in grooves 36 are spaced apart on the side wall of the adjustment groove 35, and the internal rotation of the built-in groove 36 is provided with a limit tooth 37 matching the tooth groove, and the distance between the limit teeth 37 is smaller than the length of the T-shaped frame 40, and the top of the lifting seat 24 is provided with a positioning tooth 38 connected with the limit tooth 37, and the lifting seat 24 is provided with an anti-deflection piece 39 for fixing the positioning tooth 38, and the anti-deflection piece 39 is movably inserted on the lifting seat 24, and when the horizontal and vertical position of the light source needs to be adjusted, the staff can remove the anti-deflection piece 39, thereby solving the problem of the lifting seat 24. In addition to fixing the limit teeth 37 and the positioning teeth 38, at this time, the staff can pull the T-frame 40 to change the position of the light source. The tooth grooves on the T-frame 40 form an engaging connection with the limit teeth 37, thereby further improving the stability when adjusting the T-frame 40 and improving the adjustment accuracy. Moreover, since the distance between the limit teeth 37 is smaller than the length of the T-frame 40, the T-frame 40 can always be engaged with a group of limit teeth 37 when moving, and the T-frame 40 is pulled by the limit teeth 37. When the anti-bias member 39 re-fixes the positioning teeth 38, the corresponding limit teeth 37 are also fixed synchronously at this time, thereby positioning the T-frame 40.

[0043] In the present embodiment, specifically, a limit shaft 42 is provided on the clamping plate 43, and the limit shaft 42 is movably plugged into the T-frame 40, and the limit shaft 42 forms a limit on the movement of the clamping plate 43 to prevent the clamping plate 43 from rotating with the No. 1 threaded shaft 41, thereby ensuring the stability of the clamping plate 43 during movement. Side plates 45 are symmetrically provided on one side of the T-frame 40 that is close to each other, and the side plates 45 are located below the clamping plate 43, and a No. 2 threaded shaft 46 and a stabilizing rod 47 are provided between the side plates 45, and the No. 2 threaded shaft 46 is rotatably provided, and the stabilizing rod 47 is located on both sides of the No. 2 threaded shaft 46, and the outer movable sleeves of the No. 2 threaded shaft 46 and the stabilizing rod 47 An auxiliary seat 48 is provided, and a slide groove 49 is opened on the side where the auxiliary seats 48 are close to each other. A second bidirectional screw rod 50 is rotatably arranged inside the slide groove 49. The movable sleeves at both ends of the second bidirectional screw rod 50 are provided with symmetrically distributed load frames 51, and the load frames 51 support the light source from the bottom. The staff can drive the auxiliary seat 48 to move up and down by rotating the second threaded shaft 46, thereby driving the load frame 51 to rise and fall. Rotating the No. 2 bidirectional screw rod 50 can drive the load frames 51 to move closer to or away from each other. Therefore, the two can cooperate with each other to form effective support for light sources of different specifications from below, thereby ensuring the stability of the light source when placed.

[0044] In actual experiments, the spatial distribution image of the transmitted light intensity contains a DC component (average value) and an AC component with the same frequency as the grating. The ratio of the AC component amplitude to the DC component is the modulation depth. There are many ways to calculate the modulation depth. For example, the original image can be analyzed in the frequency domain to find the relative intensity of the corresponding frequency domain component. A relatively simple method is to directly estimate the peak grayscale T1, trough grayscale T2 and camera background grayscale G in the original image, and then use the following formula to calculate the modulation depth:

[0045] Modulation depth = (T1-T2) / (T1+T2-2G)

[0046] The modulation depth is related to the material thickness, reduced scattering coefficient, and absorption coefficient. During testing, the material thickness is known, and there are only two variables: the reduced scattering coefficient and the absorption coefficient. Figure 8 The figure shows the modulation depth calculated by Monte Carlo simulation. The corresponding thickness is 3 mm and the grating period is 5 mm. When the grating period is 4 mm, the corresponding modulation depth and its relationship with the optical properties change ( Fig. 9 ), by comparing the modulation depths at different spatial modulation frequencies obtained experimentally with the Monte Carlo simulation results, the reduced scattering coefficient and absorption coefficient of the material can be obtained at the same time.

[0047] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A spatial light modulation measurement device, comprising a light source for providing illumination; characterized in that: It also comprises an experimental box (1) for storing a light source, wherein a partition plate (2) is arranged inside the experimental box (1), a light path groove (3) matching the light source is opened in the middle of the partition plate (2), a grating plate (12) for separating light is arranged on the top of the partition plate (2), and a high-definition camera (8) for shooting is arranged on the inner top of the experimental box (1); The bottom of the experimental box (1) is symmetrically provided with threaded columns (9), and the top of the threaded columns (9) is connected to the partition plate (2). The threaded columns (9) are symmetrically distributed on both sides of the optical path groove (3). The threaded columns (9) are provided with a clamping assembly that can be lifted up and down and is used to fix the light source; The clamping assembly comprises a lifting seat (24), a threaded sleeve (26) is rotatably sleeved on the lifting seat (24) and is threadedly connected to the threaded column (9), a plurality of groups of gear teeth equidistantly distributed are provided on the circumferential outer edge of the threaded sleeve (26), an inner gear sleeve (29) meshing with the gear teeth is slidably sleeved on the outer side of the threaded sleeve (26), and the inner gear sleeve (29) can move up and down along the outer surface of the threaded sleeve (26), a T-shaped frame (40) is movably provided on one side of the lifting seat (24) close to each other, and a plurality of groups of tooth grooves are provided on one side of the T-shaped frame (40) close to the lifting seat (24), a first threaded shaft (41) is movably provided on one side of the T-shaped frame (40) close to each other, a clamping plate (43) for clamping a light source is provided at one end of the first threaded shaft (41), and a gasket (44) is provided on the contact surface between the clamping plate (43) and the light source.

2. The spatial light modulation measurement device according to claim 1, characterized in that: A bracket (4) is arranged on the top of the partition plate (2), and protrusions for supporting the grating plate (12) are arranged at both ends of the bracket (4). A fixing frame (5) for supporting the high-definition camera (8) is arranged on the inner top of the experimental box (1), and a card slot (6) is symmetrically opened on the fixing frame (5). A camera frame plate (7) is arranged on the high-definition camera (8), and the camera frame plate (7) can be slidably inserted into the interior of the card slot (6).

3. The spatial light modulation measurement device according to claim 2, characterized in that: The experimental box (1) is provided with a limit frame (10) on both sides of the front side, and a sealing plate (11) is slidably provided inside the limit frame (10). Positioning plates (13) are symmetrically provided at both ends of the bottom of the grating plate (12). A positioning groove (14) matching the positioning plate (13) is provided on the top of the protrusion, and a magnetic plate (15) is provided at the bottom end of the positioning plate (13) and the bottom of the positioning groove (14), and the two magnetic plates (15) have opposite magnetism on the sides facing each other.

4. The spatial light modulation measurement device according to claim 1, characterized in that: The grating plate (12) has an interlayer cavity (16) formed inside, and a plurality of groups of spaced grating grooves (17) communicating with the interlayer cavity (16) are formed through the top of the grating plate (12). A first bidirectional screw rod (18) is rotatably provided on both sides of the interlayer cavity (16). A plurality of groups of spaced light blocking plates (19) are sleeved on the outer side of the first bidirectional screw rod (18). The length of the light blocking plates (19) is greater than the length of the grating grooves (17), and the light blocking plates (19) are grouped in pairs for blocking the grating grooves (17).

5. The spatial light modulation measurement device according to claim 4, characterized in that: One end of one side of the grating plate (12) is rotatably provided with a first pulley (20) connected to a first bidirectional screw rod (18); the middle part of one side of the grating plate (12) is rotatably provided with a second pulley (21); the diameter of the second pulley (21) is larger than the diameter of the first pulley (20); the first pulley (20) and the second pulley (21) are synchronously rotated via a belt (22); a driving handle (23) is provided on the second pulley (21); and a protective cover for protecting the first pulley (20) and the second pulley (21) is provided on one side of the grating plate (12).

6. The spatial light modulation measurement device according to claim 1, characterized in that: The two ends of the top of the lifting seat (24) are provided with movable grooves (25) for installing a threaded sleeve (26), the bottom wall of the movable groove (25) is provided with an annular groove (27), and the bottom of the threaded sleeve (26) is provided with an annular seat (28) matching the annular groove (27).

7. The spatial light modulation measurement device according to claim 1, characterized in that: A support rod (30) is arranged on the top of the lifting seat (24), a top plate (31) is arranged on the top of the support rod (30), a circular groove matching the threaded column (9) is opened on the top plate (31), guide columns (32) are symmetrically arranged on the bottom of the top plate (31), and the guide columns (32) are located on both sides of the circular groove, the bottom ends of the guide columns (32) are connected to the lifting seat (24), and a pull plate (33) and a spring (34) are sleeved on the outer side of the guide column (32), and the pull plate (33) is connected to the inner gear sleeve (29), and the spring (34) is located above the pull plate (33) and squeezes the pull plate (33).

8. The spatial light modulation measurement device according to claim 1, characterized in that: The lifting seat (24) is provided with an adjustment groove (35) on the side close to each other for the T-shaped frame (40) to slide, and three groups of built-in grooves (36) are arranged at intervals on the side wall of the adjustment groove (35). The inner part of the built-in groove (36) is rotatably provided with a limit tooth (37) matching the tooth groove, and the distance between the limit teeth (37) is smaller than the length of the T-shaped frame (40). The top of the lifting seat (24) is rotatably provided with a positioning tooth (38) connected with the limit tooth (37), and the lifting seat (24) is provided with an anti-deflection member (39) for fixing the positioning tooth (38), and the anti-deflection member (39) is movably inserted on the lifting seat (24).

9. The spatial light modulation measurement device according to claim 1, characterized in that: A limit shaft (42) is arranged on the clamping plate (43), and the limit shaft (42) is movably plugged into the T-shaped frame (40). Side plates (45) are symmetrically arranged on the sides of the T-shaped frame (40) that are close to each other, and the side plates (45) are located below the clamping plate (43). A second threaded shaft (46) and a stabilizing rod (47) are arranged between the side plates (45), and the second threaded shaft (46) is rotatably arranged, and the stabilizing rod (47) is located on both sides of the second threaded shaft (46).

10. The spatial light modulation measurement device according to claim 9, characterized in that: An auxiliary seat (48) is provided on the outer movable sleeve of the second threaded shaft (46) and the stabilizing rod (47); a slide groove (49) is provided on the side of the auxiliary seat (48) close to each other; a second bidirectional screw rod (50) is rotatably arranged inside the slide groove (49); symmetrically distributed load frames (51) are provided on the movable sleeves at both ends of the second bidirectional screw rod (50), and the load frames (51) support the light source from the bottom thereof.

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