Device for measuring balance position of torsion balance

Abstract

The utility model discloses a torsion balance balance position measuring device. The device is characterized by comprising a laser light source system used for generating a linear laser beam, a torsion balance system used for reflecting the linear laser beam, a long-strip-shaped linear array CCD system used for detecting the laser beam, and a control system used for converting a change signal of the intensity output by the long-strip-shaped linear array CCD along with a pixel position into a change signal of the pixel position along with time, and the data processing and displaying system is used for displaying in real time. According to the utility model, the laser light source system for generating linear laser is adopted, so that the limitation of the position adjustment accuracy of laser spots on the CCD is relaxed; by adopting the strip-shaped linear array CCD, the data acquisition of the laser spot position can be realized, the measurement precision of the laser spot position can be improved, the longitudinal detection distance of the torsion scale is shortened, and the instrument integration is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to physical experiment technical field, specifically point to a torsion balance balance position measuring device. BACKGROUND

[0002] The discovery of the law of universal gravitation is one of the great achievements in natural science, which plays a very important theoretical support for the research of a series of modern physical science problems such as cosmology, gravitational physics and field theory. Among them, a universal constant, the gravitational constant G, is involved, and the measurement of its accuracy is an important topic in the field of physics, because it involves but is not limited to the following problems: what is the nature of the interaction of gravity? Will it change over time, etc. At present, the commonly used G measurement method is Cavendish torsion balance and its variant device. One of the key parameters is the balance position of the torsion balance under different weights. The usual method is to first reflect the incident laser beam to the scale of the observation screen through the reflecting mirror of the torsion balance, then record the falling point of the reflected light spot on the scale with the torsion balance pendulum, and finally obtain the balance position of the torsion balance under different weights through a series of falling points. For example, CN202020293750, CN201420017137, CN202022680185 and other patent contents. The scheme formed by these patents in this way is 1) the reflecting surface of the reflecting mirror is parallel to the horizontal rod of the torsion balance, and the laser beam is nearly vertically incident on the reflecting mirror; 2) the laser beam is a circular spot with very small radius; 3) the resolution of the scale is usually 1mm; 4) the scale is usually at a vertical distance of about 5m from the reflecting mirror. The disadvantages of this scheme are at least as follows: the large size of the circular spot and the low resolution of the scale result in low detection accuracy of the balance position; the long vertical distance occupies a large space; manual reading of the scale cannot realize real-time data, and cannot realize automation and intelligentization. Therefore, in the integration of light, machine, electricity, software, algorithm and control today, the measurement of the balance position of the torsion balance urgently needs to study a new technology that can realize high precision and high automation. Therefore, a torsion balance balance position measuring device is proposed. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at solving the above problems and provides a torsion balance balance position measuring device.

[0004] In order to achieve the above purpose, the utility model provides the following technical scheme: a torsion balance balance position measuring device, characterized by comprising a laser light source system for generating a linear laser beam, a torsion balance system for reflecting the linear laser beam, a long strip line array CCD system for detecting the laser beam, and a data processing and display system for converting the intensity change signal of the long strip line array CCD output with the pixel position into a pixel position change signal with time and displaying it in real time.

[0005] Further preferably, it further comprises a base, a gantry fixed on the base, and a lifting platform fixed on the base.

[0006] Further preferably, the laser light source system comprises a laser head adjusting frame connected to the gantry or the lifting platform, a laser head connected to the laser head adjusting frame, and an adjustable power supply connected to the laser head.

[0007] Further preferably, the torsion balance system comprises an upper connecting plate fixed at the top end of the gantry, a suspension wire connected to the upper connecting plate, a torsion vertical rod connected to the other end of the suspension wire, a torsion horizontal rod connected to the other end of the torsion vertical rod, a right ball and a left ball connected to the two ends of the torsion horizontal rod and having equal distances from the center of the balls to the central axis of the torsion vertical rod, and a torsion mirror connected to the torsion vertical rod.

[0008] Further preferably, the bottom end of the torsion vertical rod is provided with a through hole having a diameter equal to that of the torsion horizontal rod; and the torsion vertical rod is provided with a groove for limiting the installation position of the torsion mirror, and the torsion mirror is installed in the groove.

[0009] Further preferably, the long-strip linear array CCD system comprises a CCD supporting rod installed on the lifting platform, a CCD adjusting frame installed on the CCD supporting rod, a long-strip linear array CCD installed on the CCD adjusting frame, a narrow-band filter connected to the photosensitive surface of the long-strip linear array CCD, and a circuit processing system for converting the laser signal sensed by the long-strip linear array CCD into an electric signal; and the narrow-band filter is larger than the photosensitive surface of the long-strip linear array CCD.

[0010] Further preferably, the data processing and display system comprises a data conversion module for converting the signal output by the long-strip linear array CCD into a signal indicating the change of the position of the image element with time, a data display module for displaying the signal curve given by the data conversion module in real time, and a data display module for calculating the balance position of the torsion balance system.

[0011] Further preferably, it further comprises a beam splitter supporting rod installed on the lifting platform, a beam splitter adjusting frame installed on the beam splitter supporting rod, and a beam splitter installed on the beam splitter adjusting frame.

[0012] The present utility model has the following beneficial effects: by using the laser light source system for generating a linear laser, the accuracy of the adjustment of the laser spot position on the CCD is relaxed;

[0013] By using the long-strip linear array CCD, the data acquisition of the laser spot position can be realized, the measurement accuracy of the laser spot position can be improved, the longitudinal detection distance of the torsion balance can be shortened, and the integration of the instrument can be facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1This is a schematic diagram of the structure of this utility model;

[0015] Fig. 2 This is a partial structural schematic diagram of the present invention;

[0016] Fig. 3 This is a schematic diagram of another embodiment of the present invention.

[0017] Legend: 1. Base; 2. Gantry; 3. Lifting platform; 4. Laser head adjustment frame; 41. Laser head; 42. Laser head support rod; 5. Upper connecting piece; 51. Suspension wire; 52. Torsion balance vertical rod; 53. Torsion balance horizontal rod; 54. Right sphere; 55. Left sphere; 56. Torsion balance reflector; 57. Through hole; 58. Groove; 6. CCD support rod; 61. CCD adjustment frame; 62. Long strip linear array CCD; 7. Beam splitter support rod; 71. Beam splitter adjustment frame; 72. Beam splitter. Detailed Implementation

[0018] The following description, in conjunction with the accompanying drawings, further illustrates the torsion balance position measuring device of this utility model.

[0019] It should be noted that all directional indicators such as up, down, left, right, front, back, etc. in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly; for example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] See Figs. 1-3 As shown, a torsion balance position measuring device is characterized by including a laser source system for generating a line-shaped laser beam, a torsion balance system for reflecting the line-shaped laser beam, a strip-shaped linear array CCD62 system for detecting the laser beam, and a data processing and display system for converting the intensity change signal output by the strip-shaped linear array CCD62 with pixel position into a pixel position change signal with time and displaying it in real time.

[0022] By employing a laser source system that generates a line-shaped laser, the limitations on the accuracy of laser spot position adjustment on the CCD are relaxed;

[0023] By using a long linear array CCD62, the position of the laser spot can be digitized, which can improve the measurement accuracy of the laser spot position, shorten the longitudinal detection distance of the torsion, and facilitate instrument integration.

[0024] In one embodiment, the system further includes a base 1, a gantry frame 2 fixed on the base 1, and a lifting platform 3 fixed on the base 1. The lifting platform 3 may be a height-adjustable block installed on the base for changing the height, or it may be a height-adjustable device.

[0025] In one embodiment, the laser source system includes a laser head adjustment frame 4 connected to the gantry 2 or the lifting platform 3, a laser head 41 connected to the laser head adjustment frame 4, and an adjustable power supply connected to the laser head 41. The lifting platform 3 is equipped with a laser head support rod 42 for mounting the laser head adjustment frame 4.

[0026] The adjustable power supply is used to adjust the output intensity of the laser; the laser head adjustment bracket 4 is used to hold the laser head 41 and adjust the attitude of the laser beam output by the laser head 41 to ensure that the laser beam is well injected into the torsion balance system.

[0027] In one embodiment, the torsion balance system includes an upper connecting piece 5 fixed to the top of the gantry frame 2, a suspension wire 51 connected to the upper connecting piece 5, a torsion balance vertical rod 52 connected to the other end of the suspension wire 51, a torsion balance horizontal rod 53 connected to the other end of the torsion balance vertical rod 52, a right ball 54 and a left ball 55 connected to both ends of the torsion balance horizontal rod 53 and having an equal distance from the center of the ball to the central axis of the torsion balance vertical rod 52, and a torsion balance reflector 56 connected to the torsion balance vertical rod 52.

[0028] The bottom end of the torsion balance vertical rod 52 is provided with a through hole 57 with the same diameter as the torsion balance horizontal rod 53; the torsion balance vertical rod 52 is provided with a groove 58 that limits the installation position of the torsion balance reflector 56, and the torsion balance reflector 56 is installed in the groove 58.

[0029] The through hole 57 is used to mount the torsion balance crossbar 53 onto the torsion balance vertical bar 52, and the groove 58 is used to allow the torsion balance reflector 56 to be mounted in the groove 58 by adhesive.

[0030] In one embodiment, the elongated linear array CCD 62 system includes a CCD support rod 6 mounted on a lifting platform 3, a CCD adjustment frame 61 mounted on the CCD support rod 6, an elongated linear array CCD 62 mounted on the CCD adjustment frame 61, a narrowband filter connected to the photosensitive surface of the elongated linear array CCD 62, and a circuit processing system for converting the laser signal sensed by the elongated linear array CCD 62 into an electrical signal; the narrowband filter is larger than the photosensitive surface of the elongated linear array CCD 62.

[0031] A narrowband filter is attached to the photosensitive surface of a long linear CCD, allowing only the laser emitted by a linear laser beam to pass through;

[0032] CCD adjustment bracket 61 is used to hold the long linear array CCD 62 and adjust the attitude of the long linear array CCD 62 to ensure that the long linear array CCD 62 can receive the line laser reflected by the torsional reflector 56.

[0033] In one embodiment, the data processing and display system comprises a data conversion module that converts the signal output by the elongated linear array CCD62 into a signal showing the change of pixel position over time, a real-time display module that displays the signal curve given by the data conversion module, and a data display module that displays the equilibrium position of the torsion balance system calculated therefrom.

[0034] The balancing position can be selected as either a 45° reflective laser type or a beam splitter 72 light guide type;

[0035] In the 45° reflector-type torsion balance system, the reflective surface of the torsion balance reflector 56 is at a 45° angle to the torsion balance crossbar 53. The laser head adjustment frame 4 is fixed to the side of the gantry frame 2, and the laser beam is adjusted by the laser head adjustment frame 4 to the same height as the torsion balance reflector 56. The elongated linear array CCD 62 is fixed to the lifting platform 3 by the CCD support rod 6, and the CCD photosensitive surface is parallel to the torsion balance crossbar. The CCD adjustment frame 61 is adjusted to the same height as the laser beam reflected by the torsion balance reflector. The data processing and display system converts the signal output by the elongated linear array CCD 62 system and displays it in real time.

[0036] The beam splitter 72 is a light guide type, and also includes a beam splitter support rod 7 mounted on the lifting platform 3, a beam splitter adjustment frame 71 mounted on the beam splitter support rod 7, and a beam splitter 72 mounted on the beam splitter adjustment frame 71.

[0037] The reflective surface of the torsion balance mirror is parallel to the torsion balance crossbar; the beam splitter 72 has a 50% beam splitting capability, the beam splitter adjustment bracket 71 clamps the beam splitter 72, and adjusts the surface of the beam splitter 72 to form a 45° angle with the torsion balance crossbar of the 0° reflector-type torsion balance system; the CCD photosensitive surface of the elongated linear array CCD 62 system is parallel to the torsion balance crossbar; the laser source system is fixed by the laser head support rod 42, the beam splitter 72 is fixed by the beam splitter support rod 7, and the elongated linear array CCD 62 system... The CCD support rod 6 is simultaneously fixed on the lifting platform 3, and the lifting platform 3 is adjusted to be at the same height as the torsion balance reflector. The linear laser beam emitted by the laser source system is reflected by the beam splitter 72 and then incident on the torsion balance reflector. After the torsion balance reflector reflects the linear laser beam, it passes through the beam splitter 72 again and is incident on the long strip linear array CCD 62 system. The data processing and display system converts the signal output by the long strip linear array CCD 62 system and displays it in real time.

[0038] The testing method of this utility model:

[0039] Step 1: Assembly of the torsion balance system

[0040] First, the horizontal bar of the torsion scale passes through the through hole 57 at the bottom of the vertical bar of the torsion scale and is fixed in a cross shape; then, the left ball 55 and the right ball 54 are respectively installed on the top of the horizontal bar of the torsion scale, and the distance from the center of each ball to the central axis of the vertical bar of the torsion scale is equal; finally, the torsion scale reflector is attached to the groove 58 at the top of the vertical bar of the torsion scale.

[0041] Step 2: Adjustment of the torsion balance system

[0042] First, fix the two ends of the suspension wire 51 to the lower connecting piece and the upper connecting piece 5 respectively; then, fix the lower connecting piece to the top of the vertical bar of the torsion scale and fix the upper connecting piece 5 to the top of the gantry; finally, adjust the upper connecting piece 5 so that the horizontal bar of the torsion scale is parallel to both sides of the gantry.

[0043] Step 3: Adjustment of the linear laser system

[0044] First, clamp the laser head 41 with the laser head adjustment bracket 4, then turn on the adjustable power supply and adjust the laser energy to the maximum. Then carefully adjust the posture of the laser head 41 so that the linear laser beam is parallel to the vertical rod of the torsion balance and incident on the torsion balance reflector.

[0045] Step 4: Adjusting the long strip linear CCD62

[0046] Under normal working conditions of the laser source system and data processing system, firstly, the long strip linear array CCD 62 is clamped by the CCD adjustment bracket 61, and the array direction of the long strip linear array CCD 62 is adjusted to be perpendicular to the line laser beam. Then, the position of the long strip linear array CCD 62 is carefully adjusted by the signal on the data processing system so that the line laser beam scans symmetrically within the effective pixel range of the CCD.

[0047] Step 5: Measurement of the balance position of the torsion balance

[0048] The torsion balance is made to oscillate periodically around the suspension wire 51 by a perturbation method. The data processing system records the entire oscillation curve in real time, and then the equilibrium position of the torsion balance is determined by the damped averaging method.

[0049] The scope of protection of this utility model is not limited to the above embodiments and their variations. Conventional modifications and substitutions made by those skilled in the art based on the content of these embodiments are all within the scope of protection of this utility model.

Claims

1. A torsion balance position measuring device, characterized in that The application relates to a laser source system for generating a linear laser beam, a torsion balance system for reflecting the linear laser beam, a long-strip linear array CCD (62) system for detecting the laser beam, and a data processing and display system for converting the intensity change signal of the long-strip linear array CCD (62) output into a signal of the change of the pixel position with time and displaying the signal in real time.

2. A torsion balance position measuring device according to claim 1, wherein: The application further comprises a base (1), a portal frame (2) fixed on the base (1), and a lifting platform (3) fixed on the base (1).

3. A torsion balance position measuring device according to claim 2, wherein: The laser source system comprises a laser head adjusting frame (4) connected on the portal frame (2) or the lifting platform (3), a laser head (41) connected on the laser head adjusting frame (4), and an adjustable power supply connected with the laser head (41), and the lifting platform (3) is provided with a laser head supporting rod (42) for mounting the laser head adjusting frame (4).

4. A torsion balance position measuring device according to claim 2, wherein: The torsion balance system comprises an upper connecting plate (5) fixed on the top end of the portal frame (2), a suspension wire (51) connected with the upper connecting plate (5), a torsion vertical rod (52) connected with the other end of the suspension wire (51), a torsion horizontal rod (53) connected with the other end of the torsion vertical rod (52), right and left balls (54) and (55) connected on the two ends of the torsion horizontal rod (53) and having equal distances from the ball center to the central axis of the torsion vertical rod (52), and a torsion reflecting mirror (56) connected on the torsion vertical rod (52).

5. A torsion balance position measuring device according to claim 4, wherein: The bottom end of the torsion vertical rod (52) is provided with a through hole (57) with the same diameter as the torsion horizontal rod (53); and the torsion vertical rod (52) is provided with a groove (58) for limiting the installation position of the torsion reflecting mirror (56), and the torsion reflecting mirror (56) is installed in the groove (58).

6. A torsion balance position measuring device according to claim 2, wherein: The long-strip linear array CCD (62) system comprises a CCD supporting rod (6) installed on the lifting platform (3), a CCD adjusting frame (61) installed on the CCD supporting rod (6), a long-strip linear array CCD (62) installed on the CCD adjusting frame (61), a narrow-band filter connected on the photosensitive surface of the long-strip linear array CCD (62), and a circuit processing system for converting the laser signal sensed by the long-strip linear array CCD (62) into an electric signal; and the narrow-band filter is larger than the photosensitive surface of the long-strip linear array CCD (62).

7. A torsion balance position measuring device according to claim 2, wherein: The data processing and display system comprises a data conversion module for converting the signal output by the long-strip linear array CCD (62) into a signal of the change of the pixel position with time, a data display module for displaying the signal curve given by the data conversion module in real time, and a data display module for calculating the balance position of the torsion balance system.

8. A torsion balance position measuring device according to claim 2, wherein: The application further comprises a beam splitter supporting rod (7) installed on the lifting platform (3), a beam splitter adjusting frame (71) installed on the beam splitter supporting rod (7), and a beam splitter (72) installed on the beam splitter adjusting frame (71).

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