A photoelectric accelerometer zero-point adjustment system and method

Abstract

This invention pertains to the assembly and adjustment technology of inertial components, specifically a method for zero-point adjustment of an accelerometer. This invention relates to a method for zero-point adjustment of a flexible pendulum accelerometer. Based on the accelerometer's zero-point bias K0, the position of the phototube is adjusted to change the pendulum component's deflection angle θ in the 0g state of the accelerometer, making the electrical zero point and mechanical zero point coincide as much as possible, thereby reducing the accelerometer's zero-point bias K0. This method is simple, intuitive, and widely applicable. It allows direct control of the accelerometer's zero-point bias K0 during the assembly and adjustment process, improving the quality of assembly and adjustment and reducing costs.

Description

Technical Field

[0001] This invention pertains to the assembly and adjustment technology of inertial components, and relates to an accelerometer zero-position adjustment system and method. Background Technology

[0002] The accelerometers used in inertial navigation systems are mostly flexible pendulum accelerometers. The zero-point bias of the accelerometer is an important design parameter. This parameter is mainly adjusted by adjusting the balance bridge and calibration network in the circuit. However, the test time is long and the adjustment accuracy is limited, which is not conducive to engineering. Summary of the Invention

[0003] The purpose of this invention is to provide a photoelectric accelerometer zero-point adjustment system and method capable of effectively controlling the zero-point bias of an accelerometer. The technical solution of this invention is...

[0004] (1) Construct an adjustment system with zero-position testing, which includes the following functional modules: accelerometer servo circuit A, adjustment device E for adjusting the phototube assembly position, hexahedron B, digital voltmeter C for testing the accelerometer output, and accelerometer D for testing. Among them, adjustment device E includes a precision displacement stage and a small clamp.

[0005] (2) First, clamp the photosensitive tube 5 with the clamp of the adjustment device E, and fix the adjustment device E and the accelerometer D on their respective mounting surfaces of the hexahedron B, so that the clamp of the adjustment device E is perpendicular to the assembly position of the photosensitive tube 5 in the accelerometer D.

[0006] (3) Flip the hexahedron to the +0g position of accelerometer D, power on, and record the +0g output of accelerometer D. Then flip the hexahedron B 180° and record the -0g output of accelerometer D. Add the two outputs together and divide by twice the product of the sampling resistor and the design value of the scale factor to obtain the zero offset K0`. Based on the deviation between the zero offset K0` value and the design value, use the adjustment device E to adjust the position of the phototube 5 up and down. Then, test and calculate the zero offset K0`` of the accelerometer in the same way. Repeat the above process until the zero offset of the accelerometer meets the design requirements.

[0007] (4) Use adhesive to attach the photosensitive tube 5 to the accelerometer D. After the adhesive has cured, adjust the clamp of the device E to loosen the photosensitive tube 5 and remove the accelerometer D from the hexahedron B.

[0008] The advantages and beneficial effects of this invention are as follows: This invention is a zero-point adjustment system and method for an accelerometer. During the assembly and adjustment process of the accelerometer, it effectively controls the zero point of the accelerometer. The adjustment method is simple, the adjustment time is short, and the adjustment effect is intuitive and effective. In the assembly and adjustment process of a certain model of accelerometer, using the method of this invention to adjust the zero-point offset of the accelerometer increased the first-time pass rate of zero-point offset adjustment from 50% to 85%, demonstrating a significant improvement in assembly and adjustment quality. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the zero-point bias formation of the accelerometer;

[0010] Figure 2 This is a schematic diagram of the assembly structure of the present invention. Detailed Implementation

[0011] The specific steps are as follows: (1) Construct an adjustment system with zero-position testing, which includes the following functional modules: accelerometer servo circuit A, adjustment device E for adjusting the phototube assembly position, hexahedron B, digital voltmeter C for testing the accelerometer output, and accelerometer D for testing. Among them, adjustment device E includes a precision displacement stage and a small clamp.

[0012] (2) First, clamp the photosensitive tube 5 with the clamp of the adjustment device E, and fix the adjustment device E and the accelerometer D on their respective mounting surfaces of the hexahedron B, so that the clamp of the adjustment device E is perpendicular to the assembly position of the photosensitive tube 5 in the accelerometer D.

[0013] (3) Flip the hexahedron to the +0g position of accelerometer D, power on it, and record the +0g output of accelerometer D. Then flip the hexahedron B 180° and record the -0g output of accelerometer D. Add the two outputs together and divide by twice the product of the sampling resistor and the scale factor (design value) to obtain the zero-position bias K0`. With the position of the light-emitting tube 6 in accelerometer D fixed, adjusting the position of the photosensitive tube 5 can change the angle θ between the electrical zero position 3 and the mechanical zero position 4 formed by the pendulum assembly 2 around the fixed point 1, that is, the zero-position bias changes. Therefore, according to the deviation between the zero-position bias K0` value and the design value, use the adjustment device E to adjust the position of the photosensitive tube 5 up and down. Then, test and calculate the zero-position bias K0`` of the accelerometer according to the above method. Repeat the above process until the zero-position bias meets the design requirements.

[0014] (4) At this time, the phototube 5 is attached to the accelerometer D using adhesive. After the adhesive has cured, the adjusting device E loosens the phototube 5 and removes the accelerometer D from the hexahedron B.

[0015] Example

[0016] The specific steps of this invention are as follows: Constructing an assembly and adjustment system (see...) Figure 2 The system comprises the following functional modules: an accelerometer servo circuit A, an adjustment device E holding the phototube 5, a hexahedron B, a digital voltmeter C for testing the accelerometer output, and the accelerometer D for testing. Based on the zero-point bias requirement of 8mg for the accelerometer being tested, the required accuracy of the digital voltmeter is 4.5 digits, the parallelism and perpendicularity of the hexahedron are 0.08mm, and the precision displacement stage accuracy of the adjustment device E is 5μm. The specific assembly and adjustment process involves fixing the accelerometer D and the adjustment device E onto the hexahedron B, ensuring that the clamp of the adjustment device E is perpendicular to the assembly position of the phototube 5 in the accelerometer D. Flip the hexahedron to the +0g position of accelerometer D, power on it, and record the +0g output of accelerometer D. Then flip the hexahedron B 180° and record the -0g output of accelerometer D. Add the two outputs together and divide by twice the product of the sampling resistor and the scale factor (design value) to obtain the zero-point bias K0'. Based on the deviation between the zero-point bias K0' value and the design value, adjust the position of phototube 5 up and down using the adjustment device E. Then, test and calculate the zero-point bias K0'' of the accelerometer using the above method. Repeat the above process until the zero-point bias meets the design requirements. At this point, use adhesive to bond phototube 5 to accelerometer D. After the adhesive has cured, loosen the clamps of the adjustment device E from phototube 5 and remove accelerometer D from hexahedron B.

Claims

1. A method for zero-point adjustment of a photoelectric accelerometer, characterized in that, (1) Construct an adjustment system with zero-position testing, which includes the following functional modules: servo circuit of accelerometer (A), adjustment device for adjusting the assembly position of phototube (E), hexahedron (B), digital voltmeter for testing accelerometer output (C), and accelerometer for testing (D). The adjustment device (E) includes a precision displacement stage and a small clamp. (2) First, clamp the phototube (5) with the clamp of the adjustment device (E), and fix the adjustment device (E) and the accelerometer (D) on their respective mounting surfaces of the hexahedron (B), so that the clamp of the adjustment device (E) is perpendicular to the assembly position of the phototube (5) in the accelerometer (D). (3) Flip the hexahedron to the +0g position of the accelerometer (D), power on, and record the +0g output of the accelerometer (D). Then flip the hexahedron (B) 180° and record the -0g output of the accelerometer (D). Add the two outputs together and divide by twice the product of the sampling resistor and the scale factor design value to obtain the zero offset K0`. Based on the deviation between the zero offset K0` value and the design value, use the adjustment device (E) to adjust the position of the phototube (5) up and down. Then, test and calculate the zero offset K0`` of the accelerometer in the same way. Repeat the above process until the zero offset of the accelerometer meets the design requirements. (4) Use adhesive to attach the photosensitive tube (5) to the accelerometer (D). After the adhesive has cured, loosen the clamp of the adjusting device (E) from the photosensitive tube (5) and remove the accelerometer (D) from the hexahedron (B).

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