Distributed photometer

Abstract

A distributed photometer is provided. The distributed photometer comprises a measurement assembly and a rotating assembly. The measurement assembly comprises an optical camera for measuring optical parameters of an object under test. The rotating assembly comprises a driving source, a harmonic gear reducer and a rotating frame. The optical camera is placed on the rotating frame, and the driving source is configured to drive the rotating frame and the optical camera to rotate around the object under test through the harmonic gear reducer. In this way, the distributed photometer can have high positioning accuracy and repeatability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optics, and more particularly to a distributed photometer. BACKGROUND

[0002] A distributed photometer is an instrument for measuring the spatial light intensity distribution, luminous flux, and colorimetric parameters of a light emitter. However, the positioning accuracy and repeatability of conventional distributed photometers are poor due to the internal vibrations during operation. In addition, the conventional distributed photometers use manual mechanical zero calibration, which makes the operation process of the distributed photometer more cumbersome. SUMMARY

[0003] The present application is made in view of the above state of the art. The object of the present application is to provide a distributed photometer that can overcome at least one of the drawbacks described in the background.

[0004] To achieve the above object, the present application adopts the following technical solutions.

[0005] The present application provides a distributed photometer comprising a measurement assembly comprising an optical camera for measuring optical parameters of a measured object, and a rotation assembly comprising a drive source, a harmonic gear reducer, and a rotating frame, wherein the optical camera is mounted on the rotating frame, and the drive source is configured to drive the rotating frame and the optical camera to rotate around the measured object via the harmonic gear reducer.

[0006] In an optional embodiment, the rotation assembly comprises a first rotation assembly and a second rotation assembly, wherein the first rotation assembly comprises a first drive source, a first harmonic gear reducer, and a first rotating frame, the first drive source is configured to drive the first rotating frame to rotate around a first rotation axis via the first harmonic gear reducer, the second rotation assembly comprises a second drive source, a second harmonic gear reducer, and a second rotating frame, the second rotating frame is mounted on the first rotating frame, the second drive source is configured to drive the second rotating frame to rotate around a second rotation axis via the second harmonic gear reducer, the first rotation axis is orthogonal to the second rotation axis, and the optical camera is fixed to the second rotating frame, such that the optical camera is configured to rotate around the first rotation axis and the second rotation axis relative to the measured object.

[0007] In another optional embodiment, the first rotation axis and the second rotation axis intersect and define an intersection point, and the intersection point is fixed relative to the position of the measured object.

[0008] In another optional solution, the rotating assembly further comprises a photoelectric switch, which is used to calibrate the zero position of the rotating frame.

[0009] In another optional solution, the optical camera comprises an imaging brightness meter and / or a spectrometer.

[0010] In another optional solution, a placing assembly is further included, which comprises a placing rod used to place the measured object.

[0011] In another optional solution, the placing rod is in a cylindrical shape, and a cable connected to the measured object can extend in the hollow part of the placing rod.

[0012] In another optional solution, the placing assembly further comprises a screw rod arranged in parallel with the placing rod, the screw rod is threadedly connected with the placing rod, and the screw rod can be rotated to drive the placing rod to move along the axial direction of the screw rod.

[0013] In another optional solution, the placing assembly further comprises a gimbal, and the measured object can be mounted on the placing rod via the gimbal, so that the measured object can swing relative to the placing rod under the adjustment of the gimbal.

[0014] In another optional solution, the placing assembly further comprises a displacement table, and the measured object can be mounted on the placing rod via the displacement table, so that the measured object can move in two mutually orthogonal directions relative to the placing rod under the adjustment of the displacement table.

[0015] By using the above technical solution, the harmonic gear reducer is used for transmission, the harmonic gear reducer can reduce the internal vibration of the distributed photometer during operation, so that the distributed photometer can have higher positioning accuracy and repeatability. In addition, the harmonic gear reducer itself has high transmission accuracy, so as to further improve the positioning accuracy and repeatability of the distributed photometer. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A perspective view of a distributed photometer according to an embodiment of the present application is shown.

[0017] Figure 2 A perspective view of a placing assembly of the distributed photometer in Figure 1 is shown.

[0018] Figure 3 A perspective view of a first rotating assembly, a second rotating assembly and a measuring assembly of the distributed photometer in Figure 1 is shown.

[0019] Figure 4 a rear view of Figure 3 is shown.

[0020] Figure 5 a perspective view of a drag chain, an inner ring and an outer ring of the distributed photometer in Figure 1 is shown.

[0021] Figure 6 a top view of Figure 5 is shown.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 1 support assembly; 11 support; 12 foot cup;

[0024] 2 placing assembly; 201 placing rod; 202 universal table; 203 displacement table; 204 hand wheel; 205 first connecting plate; 206 screw rod; 207 adjusting plate; 208 second connecting plate; 209 first push plate; 210 first adjusting bolt;

[0025] 3 first rotating assembly; 31 first motor; 32 first harmonic gear reducer; 33 first rotating frame; 34 first photoelectric switch; 35 first induction block;

[0026] 4 second rotating assembly; 401 second motor; 402 second harmonic gear reducer; 403 second rotating frame; 404 driven shaft; 405 back plate; 406 second push plate; 407 second adjusting bolt; 408 second photoelectric switch; 409 third photoelectric switch; 410 fourth photoelectric switch; 411 second induction block; 412 centering shaft; 413 pointer;

[0027] 5 measuring assembly; 51 imaging luminance meter; 52 spectrometer; 53 drag chain; 531 first chain segment; 532 second chain segment; 533 third chain segment; 54 inner ring; 541 first wall part; 542 second wall part; 54a through hole; 55 outer ring; 551 third wall part; 552 fourth wall part; 55a notch;

[0028] 6 control assembly; 61 distribution box; 62 rocker arm; 63 display; 64 keyboard;

[0029] 7 illuminator. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. It is to be understood that the specific description is only for the purpose of teaching the skilled in the art how to implement the present application, and is not for the purpose of limiting the scope of the present application.

[0031] Figures 1 to 6A distributed photometer according to an embodiment of the present application is shown, in particular a near-field distributed photometer is shown. The distributed photometer can include a support assembly 1, a placement assembly 2, a first rotating assembly 3, a second rotating assembly 4, a measuring assembly 5, and a control assembly 6.

[0032] Referring to Figure 1 The support assembly 1 can include a support frame 11 and foot cups 12. Specifically, the support frame 11 can be built by multiple aluminum profiles fixed to each other, and the foot cups 12 can be arranged at the bottom of the support frame 11 to support the support frame 11.

[0033] Referring to Figure 2 The placement assembly 2 can include a placement rod 201, a universal table 202, a displacement table 203, a hand wheel 204, a first connecting plate 205, a screw rod 206, an adjusting plate 207, a second connecting plate 208, a first push plate 209, and a first adjusting bolt 210. Specifically, a light body 7 (an example of a measured object, for example, can be a lamp) can be installed at one end of the placement rod 201 through the universal table 202 and the displacement table 203. The universal table 202 can be a component including a ball head. By adjusting the universal table 202, the light body 7 can swing relative to the placement rod 201. By adjusting the displacement table 203, the light body 7 can move in two mutually orthogonal directions. The placement rod 201 can be formed in a cylindrical shape, and a cable connected with the light body 7 can be connected with the control assembly 6 through the hollow portion of the placement rod 201.

[0034] The first connecting plate 205 and the second connecting plate 208 can be fixed with the support frame 11, and the screw rod 206 can be rotationally connected with the first connecting plate 205 and the second connecting plate 208, for example, through a deep groove ball bearing. The placement rod 201 can pass through the second connecting plate 208 and be slidingly connected with the second connecting plate 208, for example, through a linear bearing. The adjusting plate 207 can be fixed with the placement rod 201 and be threadedly connected with the screw rod 206. The placement rod 201 and the screw rod 206 can be arranged parallel to each other and vertically, and the hand wheel 204 can be arranged at the top end of the screw rod 206. When the hand wheel 204 rotates, the screw rod 206 can rotate synchronously with the hand wheel 204, and the adjusting plate 207 and the placement rod 201 can be lifted and lowered in the vertical direction under the drive of the screw rod 206, so as to be able to adjust the height of the light body 7.

[0035] The first push plate 209 can be fixed with the support frame 11, and the second connecting plate 208 can be arranged between the two first push plates 209. The first adjusting bolt 210 can be threadedly connected with the first push plate 209, and the tail end of the first adjusting bolt 210 can abut against the second connecting plate 208. When the second connecting plate 208 has not been fixed with the support frame 11, the position of the second connecting plate 208 can be accurately adjusted by screwing the first adjusting bolt 210.

[0036] Referring to Figure 3 and Figure 4 , the first rotating assembly 3 can include a first motor 31 (an example of a first driving source), a first harmonic gear reducer 32 (see Figure 5 ), a first rotating frame 33, a first photoelectric switch 34 (see Figure 1 ), and a first sensing block 35. Specifically, the first motor 31 and the first harmonic gear reducer 32 can be installed on the support 11. The first motor 31 can be a servo motor, which can be connected with the first rotating frame 33 through the first harmonic gear reducer 32, so that the first motor 31 can drive the first rotating frame 33 to rotate around a vertical first rotating axis. The placement rod 201 can pass through the top of the first rotating frame 33 along the first rotating axis and be rotationally connected with the first rotating frame 33, for example, through a self-aligning ball bearing. The first photoelectric switch 34 can be fixed with the support 11, and the first sensing block 35 can be fixed with the first rotating frame 33. When the first rotating frame 33 rotates to zero position, or in other words, rotates to the initial position, around the first rotating axis, the first sensing block 35 can be aligned with the first photoelectric switch 34, for calibrating the zero position of the first rotating frame 33.

[0037] The second rotating assembly 4 can include a second motor 401 (an example of a second driving source), a second harmonic gear reducer 402, a second rotating frame 403, a counterweight (not shown in the figure), a driven shaft 404, a back plate 405, a second push plate 406, a second adjusting bolt 407, a second photoelectric switch 408, a third photoelectric switch 409, a fourth photoelectric switch 410, a second sensing block 411, a centering shaft 412, and a pointer 413. Specifically, the second motor 401 and the second harmonic gear reducer 402 can be installed on the first rotating frame 33. The second motor 401 can be a servo motor, which can be connected with the second rotating frame 403 through the second harmonic gear reducer 402, so that the second motor 401 can drive the second rotating frame 403 to rotate around a horizontal second rotating axis. The second rotating axis can always intersect with the first rotating axis and define an intersection point which is fixed relative to the position of the placement rod 201. The counterweight can be fixed with the second rotating frame 403, for realizing dynamic balance of the second rotating frame 403 together with the test assembly.

[0038] The driven shaft 404 can be fixed with the second rotating frame 403 and extend along the second rotating axis. The back plate 405 can be fixed with the first rotating frame 33, and the driven shaft 404 can be rotatably connected with the back plate 405, for example, through a self-aligning ball bearing. The second push plate 406 can be fixed with the first rotating frame 33, and the back plate 405 can be arranged between the two second push plates 406. The second adjusting bolt 407 can be threadedly connected with the second push plate 406, and the tail end of the second adjusting bolt 407 can abut against the back plate 405. When the back plate 405 has not been fixed with the first rotating frame 33, the position of the back plate 405 can be accurately adjusted by screwing the second adjusting bolt 407.

[0039] The second photoelectric switch 408, the third photoelectric switch 409, and the fourth photoelectric switch 410 can be fixed with the first rotating frame 33 and arranged at intervals around the second rotating axis, and the second sensing block 411 can be fixed with the second rotating frame 403. When the second rotating frame 403 is rotated to the zero position around the second rotating axis, the second sensing block 411 can be aligned with the second photoelectric switch 408, for calibrating the zero position of the second rotating frame 403. When the second rotating frame 403 is rotated to the limit position around the second rotating axis, the second sensing block 411 can be aligned with the third photoelectric switch 409 or the fourth photoelectric switch 410, for limiting the second rotating frame 403.

[0040] The centering shaft 412 can be fixed with the second rotating frame 403 and arranged coaxially with the second rotating axis, and the outer circumferential surface of the centering shaft 412 can be provided with a scale for indicating the rotation angle. The pointer 413 can be fixed with the first rotating frame 33, and the tip of the pointer 413 can point to the scale on the centering shaft 412. In this way, by observing the scale indicated by the pointer 413, the rotation angle of the second rotating frame 403 can be known.

[0041] Referring to Figures 4 to 6 , the measurement assembly 5 can include an imaging luminance meter 51 (an example of an optical camera), a spectrometer 52 (an example of an optical camera), a drag chain 53, an inner ring 54, and an outer ring 55. Specifically, the imaging luminance meter 51 and the spectrometer 52 can be fixed with the second rotating frame 403, such that the imaging luminance meter 51 and the spectrometer 52 are configured to be rotatable synchronously with respect to the light emitter 7 around the first rotating axis and the second rotating axis. The imaging luminance meter 51 can define a first optical axis, which can be configured to always pass through the intersection defined by the first rotating axis and the second rotating axis. The spectrometer 52 can define a second optical axis, which can be configured to be staggered and parallel to the first optical axis.

[0042] The inner ring 54 can include a first wall portion 541 and a second wall portion 542 fixed to each other. The first wall portion 541 and the second wall portion 542 can extend entirely in the circumferential direction of the inner ring 54 and jointly form an L-shaped cross section. Among them, the first wall portion 541 can be formed as a vertical portion of the L shape, and the second wall portion 542 can be formed as a horizontal portion of the L shape. The second wall portion 542 can extend from the first wall portion 541 to the radially outer side of the first wall portion 541. The first wall portion 541 can be provided with a through hole 54a communicating the radially inner side and the radially outer side thereof.

[0043] The outer ring 55 can include a third wall portion 551 and a fourth wall portion 552 fixed to each other. The third wall portion 551 and the fourth wall portion 552 can extend non-entirely in the circumferential direction of the outer ring 55 and form a gap 55a, for example, the angle of the gap 55a can be 50° to 70°. Preferably, the angle of the gap 55a can be 60°. The third wall portion 551 and the fourth wall portion 552 can jointly form an L-shaped cross section. Among them, the third wall portion 551 can be formed as a vertical portion of the L shape, and the fourth wall portion 552 can be formed as a horizontal portion of the L shape. The fourth wall portion 552 can extend from the third wall portion 551 to the radially inner side of the third wall portion 551.

[0044] The inner ring 54 and the outer ring 55 can be coaxially arranged with the first rotation axis, and the outer ring 55 can be arranged at the radially outer side of the inner ring 54. Among them, the inner ring 54 can be fixed with the first rotating frame 33, and the outer ring 55 can be fixed with the support 11. When the first rotating frame 33 rotates around the first rotation axis, the inner ring 54 also rotates relative to the outer ring 55.

[0045] The drag chain 53 can be pivotally connected by a plurality of unit links, and the pivot axis of each unit link can be parallel to the first rotation axis. The drag chain 53 can be arranged between the inner ring 54 and the outer ring 55, and can specifically include a first chain segment 531, a second chain segment 532, and a third chain segment 533. Among them, the first chain segment 531 can abut against the third wall portion 551 and the fourth wall portion 552 and extend along the circumferential direction of the outer ring 55, and the second chain segment 532 can abut against the first wall portion 541 and the second wall portion 542 and extend along the circumferential direction of the inner ring 54. The third chain segment 533 can be formed in a U shape, and the first chain segment 531 and the second chain segment 532 can be connected via the third chain segment 533. One end of the drag chain 53 can be aligned with the edge of the through hole 54a, and the other end of the drag chain 53 can be aligned with the edge of the gap 55a. The cable connected with the imaging brightness meter 51 and the spectrometer 52 can be sequentially led out to the position where the control assembly 6 is located via the through hole 54a, the drag chain 53, and the gap 55a and connected with the control assembly 6.

[0046] Referring to Figure 1The control assembly 6 can include a distribution box 61, a rocker arm 62, a display 63, and a keyboard 64. Specifically, the distribution box 61 can be fixed with the support 11 for loading a power supply, a motor controller, and a programmable logic controller (PLC). The rocker arm 62 can be rotationally connected with the support 11, and the keyboard 64 and the display 63 can be loaded on the rocker arm 62 for inputting control instructions and displaying measurement results.

[0047] The working principle of the distributed photometer will be described below.

[0048] The whole distributed photometer can be located in a darkroom to ensure that the measurement process is performed in a dark environment. The light emitter 7 can be pre-installed on the displacement table 203. During measurement, the first rotating frame 33 can rotate around the first rotating axis by a first sampling interval a first angle The second rotating frame 403 can rotate around the second rotating axis by a second sampling interval θ0a second angle θ. The first rotating frame 33 rotates by one first sampling interval The second rotating frame 403 can rotate through the whole second angle θand reset. For example, in the embodiment, the first angle may be 360°, and the first sampling interval may be 5°. The second angle θmay be 90° to 155°, and the second sampling interval θ0may be 5°. Preferably, the second angle θmay be 120°. At each sampling position, the imaging luminance meter 51 and the spectrometer 52 can perform single-shot imaging on the surface of the light emitter 7 to obtain optical parameters such as light intensity, luminous flux, and chromaticity. The optical parameters collected at each sampling position are integrated to obtain the light field information of the light emitter 7.

[0049] In this way, by using the harmonic gear reducer for transmission, the harmonic gear reducer can reduce the internal vibration of the distributed photometer during operation, so that the distributed photometer can have higher positioning accuracy and repeatability. In addition, the harmonic gear reducer itself has higher transmission accuracy, thereby further improving the positioning accuracy and repeatability of the distributed photometer. Further, by setting the photoelectric switch for zero calibration, the distributed photometer can automatically calibrate zero, improving the operation convenience of the distributed photometer.

[0050] The present application has at least the following advantages.

[0051] (i) By using the harmonic gear reducer for transmission, the harmonic gear reducer can reduce the internal vibration of the distributed photometer during operation, so that the distributed photometer can have higher positioning accuracy and repeatability. In addition, the harmonic gear reducer itself has higher transmission accuracy, thereby further improving the positioning accuracy and repeatability of the distributed photometer.

[0052] (ii) By setting the photoelectric switch for zero calibration, the distributed photometer can automatically calibrate zero, improving the operation convenience of the distributed photometer.

[0053] (iii) By setting the screw rod 206, the universal table 202 and the displacement table 203, the position and attitude of the light emitter 7 can be accurately adjusted, so that the distributed photometer can accurately collect light field information.

[0054] (iv) By setting the push plate, the installation position of the component can be fine-tuned by the push plate, so that the distributed photometer can have higher assembly precision, thereby further improving the positioning accuracy and repeat positioning accuracy of the distributed photometer.

[0055] (v) By setting the drag chain 53, the cable connected with the imaging luminance meter 51 and the spectrometer 52 can rotate synchronously with the first rotating frame 33 under the guidance of the drag chain 53, so that the cable is not prone to winding phenomenon, thereby effectively reducing the possibility of failure of the distributed photometer.

[0056] It should be understood that the above embodiments are only exemplary and are not intended to limit the present application. Those skilled in the art can make various modifications and changes to the above embodiments under the teaching of the present application without departing from the scope of the present application.

Claims

1. A distributed photometer, characterized in that, The measurement assembly (5) comprises an optical camera for measuring optical parameters of a measured object (7), a drag chain (53), an inner ring (54) and an outer ring (55), the inner ring (54) comprises a first wall portion (541) and a second wall portion (542) fixed to each other, the first wall portion (541) and the second wall portion (542) extend entirely around the circumference of the inner ring (54) and jointly form an L-shaped cross section, the outer ring (55) comprises a third wall portion (551) and a fourth wall portion (552) fixed to each other, the third wall portion (551) and the fourth wall portion (552) extend non-entirely around the circumference of the outer ring (55) and are formed with a gap (55a), and the third wall portion (551) and the fourth wall portion (552) jointly form an L-shaped cross section, the drag chain (53) is pivotally connected by a plurality of unit chain links, and the drag chain (53) is arranged between the inner ring (54) and the outer ring (55); and a rotating assembly comprising a driving source, a harmonic gear reducer, and a rotating frame, the optical camera is placed on the rotating frame, and the driving source is used to drive the rotating frame and the optical camera to rotate around the measured object (7) through the harmonic gear reducer, a support (11), a placing assembly (2) comprising a placing rod (201) for placing the measured object (7), the placing assembly (2) comprises a first push plate (209), a second connecting plate (208), and a first adjusting bolt (210), the placing rod (201) penetrates through the second connecting plate (208), the first push plate (209) is fixed with the support (11), the second connecting plate (208) is arranged between two first push plates (209), the first adjusting bolt (210) is threadedly connected with the first push plate (209), and a tail end of the first adjusting bolt (210) abuts against the second connecting plate (208). The rotating assembly comprises a first rotating assembly (3) and a second rotating assembly (4), the first rotating assembly (3) comprises a first driving source (31), a first harmonic gear reducer (32), and a first rotating frame (33), the first driving source (31) is used to drive the first rotating frame (33) to rotate around a first rotating axis through the first harmonic gear reducer (32), 2. The distributed photometer of claim 1, wherein, the second rotating assembly (4) comprises a second driving source (401), a second harmonic gear reducer (402), and a second rotating frame (403), the second rotating frame (403) is mounted on the first rotating frame (33), and the second driving source (401) is used to drive the second rotating frame (403) to rotate around a second rotating axis through the second harmonic gear reducer (402). ​ ​ The first rotation axis is orthogonal to the second rotation axis, and the optical camera is fixed to the second rotating frame (403) so that the optical camera is configured to rotate around the first rotation axis and the second rotation axis relative to the measured object (7).

3. The distributed photometer of claim 2, wherein, The first rotation axis and the second rotation axis intersect and define an intersection point, and the intersection point is fixed relative to the position of the measured object (7).

4. The distributed photometer according to any one of claims 1 to 3, characterized in that, The rotating assembly further comprises a photoelectric switch (34, 408) for calibrating the zero position of the rotating frame.

5. The distributed photometer of any one of claims 1 to 3, wherein, The optical camera comprises an imaging brightness meter (51) and / or a spectrometer (52).

6. The distributed photometer of claim 1, wherein, The placement rod (201) is in a cylindrical shape, and a cable connected to the measured object (7) can extend in the hollow portion of the placement rod (201).

7. The distributed photometer of claim 1, wherein, The placement assembly (2) further comprises a screw rod (206) arranged in parallel with the placement rod (201), the screw rod (206) is threadedly connected with the placement rod (201), and the screw rod (206) is rotatable to drive the placement rod (201) to move along the axial direction of the screw rod (206).

8. The distributed photometer of claim 1, wherein, The placement assembly (2) further comprises a gimbal (202), and the measured object (7) can be mounted to the placement rod (201) via the gimbal (202) so that the measured object (7) can swing relative to the placement rod (201) under the adjustment of the gimbal (202).

9. The distributed photometer of claim 1, wherein, The placement assembly (2) further comprises a displacement table (203), and the measured object (7) can be mounted to the placement rod (201) via the displacement table (203) so that the measured object (7) can move in two mutually orthogonal directions relative to the placement rod (201) under the adjustment of the displacement table (203).

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