A force measuring device based on photoelectric conversion

Abstract

The present invention relates to a force measuring device based on photoelectric conversion, including a base, a spring, a hanging plate, a hook, a light emitting device, a spectrophotometer, a first photosensitive element and a second photosensitive element; the top of the hanging plate is hung on the base by a spring, and the hanging plate is provided with a cut hole with a gradually decreasing aperture from top to bottom, and the hook is fixedly installed on the bottom of the hanging plate; the light emitting device, the spectrophotometer, the first photosensitive element and the second photosensitive element are all installed on the base, and when the hook on the hanging plate has no fixed element mounted, the light emitting device, the spectrophotometer, the first photosensitive element and the second photosensitive element are all opposite to the lower part of the hanging plate; the light emitting device is opposite to the spectrophotometer; the first photosensitive element and the second photosensitive element are respectively located on the two sides of the spectrophotometer. The present invention is based on the photoelectric effect phenomenon, and changes the current size by changing the blocking area between the light source and the photosensitive element, so as to perform accurate force measurement; the device of the present invention has a simple structure and high measurement accuracy, and is easy to promote and use.

Description

Technical Field

[0001] The invention relates to a detection field, and in particular to a force measuring device based on photoelectric conversion. Background Art

[0002] With the development of science and technology, people have higher and higher requirements for the accuracy of various measurements, and the data to be measured is also increasing, so various force measuring devices have emerged. Most of the existing force measuring devices have low measurement accuracy and complex structures, and cannot be widely used. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a force measuring device based on photoelectric conversion, which has a simple structure, high measuring accuracy and is easy to promote and use.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a force measuring device based on photoelectric conversion, comprising a base, a spring, a hanging plate, a hook, a light-emitting device, a spectrometer, a first photosensitive element and a second photosensitive element; the top of the hanging plate is hung on the base by the spring, the hanging plate is provided with a cut hole with an aperture gradually decreasing from top to bottom, and the hook is fixedly installed on the bottom end of the hanging plate; the light-emitting device, the spectrometer, the first photosensitive element and the second photosensitive element are all installed on the base, and when the hook on the hanging plate has no mounting fixed element, the light-emitting device, the spectrometer, the first photosensitive element and the second photosensitive element are all opposite to the lower part of the hanging plate; the light-emitting device is opposite to the spectrometer, and the light emitted by the light-emitting device is irradiated on the spectrometer; the first photosensitive element and the second photosensitive element are respectively located on two sides of the spectrometer, and the first photosensitive element is used to sense the light reflected by the spectrometer, and the second photosensitive element is used to sense the light transmitted through the cut hole on the hanging plate.

[0005] Based on the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, guide rails are provided on both sides of the base, and both side ends of the hanging plate are respectively limited in the guide rails on both sides of the base, and the hanging plate can slide up and down along the guide rails.

[0007] Furthermore, the base is specifically a frame with an open bottom, the guide rails are fixedly installed on the inner sides of both sides of the frame, the top end of the hanging plate is hung on the inner side of the top of the frame by the spring, and the board surface of the hanging plate is located in the frame surface of the frame.

[0008] Furthermore, the light emitting device, the beam splitter and the first photosensitive element are mounted on the frame via a first mounting seat and are located on one side of the frame surface, and the second photosensitive element is mounted on the frame via a second mounting seat and is located on the other side of the frame surface.

[0009] Furthermore, the light emitted by the light emitting device is parallel light, the light reflected by the beam splitter is vertical light, and the light transmitted by the beam splitter is parallel light.

[0010] Furthermore, the ratio of transmittance to reflectivity of the beam splitter is δ:ε.

[0011] Furthermore, the fixing element is fixedly placed on the workbench.

[0012] Furthermore, a first current detector is electrically connected to a first photosensitive element pin of the first photosensitive element, and a second current detector is electrically connected to a second photosensitive element pin of the second photosensitive element.

[0013] Furthermore, the invention further includes a processor, and the first current detector and the second current detector are both electrically connected to the processor.

[0014] The beneficial effects of the present invention are as follows: the force measuring device based on photoelectric conversion of the present invention is based on the "photoelectric effect" phenomenon, and changes the current size by changing the blocking area between the light source and the photosensitive element, thereby performing accurate force measurement; the device of the present invention has a simple structure and high measurement accuracy, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of a force measuring device based on photoelectric conversion in a state without force in the present invention;

[0016] Figure 2 for Figure 1 A front cross-sectional view of

[0017] Figure 3 for Figure 1 A side cross-sectional view of

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of a force measuring device based on photoelectric conversion in the present invention when it is subjected to a relatively small force;

[0019] Figure 5 for Figure 4 A front cross-sectional view of

[0020] Figure 6 for Figure 4 A side cross-sectional view of

[0021] Figure 7It is a schematic diagram of the three-dimensional structure of a force measuring device based on photoelectric conversion in the present invention when it is subjected to a relatively large force;

[0022] Figure 8 for Figure 7 A front cross-sectional view of

[0023] Fig. 9 for Figure 7 Side cross-sectional view of .

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Base, 2. Spring, 3. Hanging plate, 3-1. Cutting hole, 4. Hook, 5. Light-emitting device, 6. Spectrum, 7. First photosensitive element, 7-1. Pin of first photosensitive element, 8. Second photosensitive element, 8-1. Pin of second photosensitive element, 9. Fixing element, 10. Guide rail, 11. First mounting seat, 12. Second mounting seat. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] like Figures 1 to 9 As shown, a force measuring device based on photoelectric conversion includes a base 1, a spring 2, a hanging plate 3, a hook 4, a light emitting device 5, a beam splitter 6, a first photosensitive element 7 and a second photosensitive element 8; the top of the hanging plate 3 is hung on the base 1 through the spring 2, the hanging plate 3 is provided with a cut hole 3-1 with a gradually decreasing aperture from top to bottom, and the hook 4 is fixedly mounted on the bottom end of the hanging plate 3; the light emitting device 5, the beam splitter 6, the first photosensitive element 7 and the second photosensitive element 8 are all mounted on the base 1, and when the hook 4 on the hanging plate 3 is not fixedly mounted When the fixed element 9 is arranged, the light-emitting device 5, the beam splitter 6, the first photosensitive element 7 and the second photosensitive element 8 are all opposite to the lower part of the hanging plate 3; the light-emitting device 5 is opposite to the beam splitter 6, and the light emitted by the light-emitting device 5 is irradiated on the beam splitter 6; the first photosensitive element 7 and the second photosensitive element 8 are respectively located on the two sides of the beam splitter 6, and the first photosensitive element 7 is used to sense the light reflected by the beam splitter 6, and the second photosensitive element 8 is used to sense the light transmitted from the beam splitter 6 through the cut hole 3-1 on the hanging plate 3.

[0028] In this specific embodiment: guide rails 10 are provided on both sides of the base 1 , and both side ends of the hanging plate 3 are respectively limited in the guide rails 10 on both sides of the base 1 , and the hanging plate 3 can slide up and down along the guide rails 10 .

[0029] In this specific embodiment: the base 1 is specifically a frame with an open bottom, the guide rail 10 is fixedly installed on the inner sides of the two sides of the frame, the top end of the hanging plate 3 is hung on the inner side of the top of the frame through the spring 2, and the board surface of the hanging plate 3 is located in the frame surface of the frame.

[0030] In this specific embodiment: the light emitting device 5, the beam splitter 6 and the first photosensitive element 7 are mounted on the frame via a first mounting seat 11 and are located on one side of the frame surface, and the second photosensitive element 8 is mounted on the frame via a second mounting seat 12 and is located on the other side of the frame surface.

[0031] In this specific embodiment: the light emitted by the light emitting device 5 is parallel light, the light reflected by the beam splitter 6 is vertical light, and the light transmitted by the beam splitter 6 is parallel light.

[0032] In this specific embodiment: the ratio of the transmittance to the reflectance of the beam splitter 6 is δ:ε, and the ratio is adjustable; for example, the transmittance of the beam splitter 6 is 50%, and the reflectance of the beam splitter 6 is 50%. For another example, the transmittance of the beam splitter 6 is 60%, and the reflectance of the beam splitter 6 is 40%, and so on.

[0033] In this specific embodiment: the fixing element 9 is fixedly placed on the workbench.

[0034] In this specific embodiment: the first photosensitive element pin 7 - 1 of the first photosensitive element 7 is electrically connected to a first current detector, and the second photosensitive element pin 8 - 1 of the second photosensitive element 8 is electrically connected to a second current detector.

[0035] In this specific embodiment: the present invention further includes a processor, and the first current detector and the second current detector are both electrically connected to the processor.

[0036] The working principle of the present invention is: when light irradiates the photosensitive element, it will cause the electrical properties of the material to change, and the range of change is proportional to factors such as the irradiation area, that is, without changing other factors, the more "photoelectrons" are generated by increasing the irradiation area, the greater the current generated; the fixing element 9 is fixedly placed on the workbench, and when the hook 4 is not connected to the fixing element 9, the spring 2 only bears the gravity of the hanging plate 3 and is in a state of approximately free length (such as Figures 1 to 3As shown), since the front end of the parallel light emitted by the light emitting device 5 is provided with a beam splitter 6, ε / (δ+ε) of the light will be reflected, and δ / (δ+ε) of the light will be transmitted, and the reflected light will be received by the first photosensitive element 7 and generate a current A0 through the first photosensitive element pin 7-1. Since the spring 2 is at a near-free length at this time, all or most of the transmitted light is blocked by the hanging plate 3 (assuming that most of the light is blocked by the hanging plate 3), and only a very small part of the transmitted light is received by the second photosensitive element 8 through the cut hole 3-1 on the hanging plate 3 and generates a weak current A1 through the second photosensitive element pin 8-1; when the hook 4 is connected to the fixing element 9 and under the action of the force F, since the fixing element 9 is fixed, the positions of the hanging plate 3 and the hook 4 remain unchanged, and the light emitting device 5, the beam splitter 6, the first photosensitive element 7 and the second photosensitive element 8 are lifted vertically upward along with the base 1, and the spring 2 is in an elongated state (as shown in FIG. Figures 4 to 6 As shown), at this time, the reflected light is received by the first photosensitive element 7 and the current generated by the first photosensitive element pin 7-1 is still A0, and because the aperture of the cut hole 3-1 on the hanging plate 3 is getting larger and larger, the photosensitive area becomes larger, and the transmitted light passes more, and the current generated by the second photosensitive element 8 and the second photosensitive element pin 8-1 becomes larger. Let the current generated at this time be A2; when the force F continues to increase (as shown Figures 7 to 9 As shown), at this time, the measuring range limit of the device of the present invention is reached, and the light transmitted through the beam splitter 6 can basically completely pass through the cut hole 3-1 on the hanging plate. At this time, the current received by the second photosensitive element 8 and generated by the second photosensitive element pin 8-1 is A3. It can be seen that the current size increases gradually from A1-A2-A3 in a regular manner. Therefore, the pulling force of the hook on the fixed element can be accurately measured according to the current size and the change in the length of the spring.

[0037] In this specific embodiment, the calculation formula for the pulling force of the hook on the fixing element according to the magnitude of the current and the change in the length of the spring is as follows:

[0038] 0~x 1 :F=k·△x,A 1 =C·△x 2 +D,

[0039] x 1 ~x 2 :F=k·△x,A 2 =E·△x+F,

[0040] x 2 ~x 3 :F=k·△x,A 3 =G;

[0041] Among them, x 1 is the diameter of the light emitting device 5, x 2 When the maximum photosensitive area is reached, x3 is the limit range of the spring, C, D, E, F, G are constants, F is the tension of the fixed element, k is the stiffness coefficient of the spring, and △x is the elongation of the spring.

[0042] In addition, the current A0 sensed by the first photosensitive element can be used to check whether the reflected light current is roughly the same each time, and can also be used to draw a curve with the transmission current ratio.

[0043] The current generated by the first photosensitive element 7 is detected by the first current detector, and the current generated by the second photosensitive element 8 is detected by the second current detector. The first current detector and the second current detector transmit the detected current to the processor, and the processor calculates the pulling force on the fixing element.

[0044] In addition, the pulling force on the fixing element may also be manually calculated using the current values ​​detected by the first current detector and the second current detector.

[0045] The present invention discloses a force measuring device based on photoelectric conversion, which is based on the "photoelectric effect" phenomenon and changes the current size by changing the blocking area between the light source and the photosensitive element, thereby performing accurate force measurement. The device of the present invention has a simple structure and high measurement accuracy and is easy to promote and use.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A force measuring device based on photoelectric conversion, characterized in that: The invention comprises a base (1), a spring (2), a hanging plate (3), a hook (4), a light emitting device (5), a beam splitter (6), a first photosensitive element (7) and a second photosensitive element (8); the top of the hanging plate (3) is hung on the base (1) by the spring (2); the hanging plate (3) is provided with a cut hole (3-1) whose aperture gradually decreases from top to bottom; the hook (4) is fixedly mounted on the bottom of the hanging plate (3); the light emitting device (5), the beam splitter (6), the first photosensitive element (7) and the second photosensitive element (8) are all mounted on the base (1); and when the hook (4) on the hanging plate (3) is not equipped with a mounting fixing element (9), the hook (4) is fixedly mounted on the bottom of the hanging plate (3); ), the light emitting device (5), the beam splitter (6), the first photosensitive element (7) and the second photosensitive element (8) are all opposite to the lower part of the hanging plate (3); the light emitting device (5) is opposite to the beam splitter (6), and the light emitted by the light emitting device (5) is irradiated on the beam splitter (6); the first photosensitive element (7) and the second photosensitive element (8) are respectively located on two sides of the beam splitter (6), and the first photosensitive element (7) is used to sense the light reflected by the beam splitter (6), and the second photosensitive element (8) is used to sense the light transmitted from the beam splitter (6) through the cut hole (3-1) on the hanging plate (3); The light emitted by the light emitting device (5) is parallel light, the light reflected by the beam splitter (6) is vertical light, and the light transmitted by the beam splitter (6) is parallel light; A first current detector is electrically connected to the first photosensitive element pin (7-1) of the first photosensitive element (7), and a second current detector is electrically connected to the second photosensitive element pin (8-1) of the second photosensitive element (8).

2. The force measuring device based on photoelectric conversion according to claim 1, characterized in that: Guide rails (10) are provided on both sides of the base (1), and the two side ends of the hanging plate (3) are respectively limited in the guide rails (10) on both sides of the base (1), and the hanging plate (3) can slide up and down along the guide rails (10).

3. The force measuring device based on photoelectric conversion according to claim 2, characterized in that: The base (1) is specifically a frame with an open bottom, the guide rails (10) are fixedly mounted on the inner sides of both sides of the frame, the top end of the hanging plate (3) is hung on the inner side of the top of the frame through the spring (2), and the plate surface of the hanging plate (3) is located in the frame surface of the frame.

4. The force measuring device based on photoelectric conversion according to claim 3 is characterized in that: The light emitting device (5), the beam splitter (6) and the first photosensitive element (7) are mounted on the frame via a first mounting seat (11) and are located on one side of the frame surface; the second photosensitive element (8) is mounted on the frame via a second mounting seat (12) and is located on the other side of the frame surface.

5. The force measuring device based on photoelectric conversion according to any one of claims 1 to 4, characterized in that: The ratio of transmittance to reflectance of the beam splitter (6) is δ:ε.

6. The force measuring device based on photoelectric conversion according to any one of claims 1 to 4, characterized in that: The fixing element (9) is fixedly placed on the workbench.

7. The force measuring device based on photoelectric conversion according to claim 1, characterized in that: The device further includes a processor, wherein the first current detector and the second current detector are both electrically connected to the processor.

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