A method for calibrating a tilt sensor using time drift stability

Abstract

The present invention relates to a method for calibrating an inclination sensor by using time drift stability, and the field of application of the inclination sensor. For the two different steady-state types, the calibration of the sensor should also be different: for the approach type inclination sensor, the calibration should be carried out under the steady-state state, and for the deviation type sensor, the calibration should be carried out at the start time of its normal output, so that different calibrations are adopted for the time drift steady-state error, so that the error can be minimized.

Description

Technical Field

[0001] The invention is applied to the field of inclination sensors and relates to a method for calibrating inclination sensors by utilizing time drift stability. Background Art

[0002] Inclination sensors measure the inclination angle of a carrier relative to a horizontal plane and are widely used in industrial control, aviation, aerospace, bridges, buildings, and other fields. This type of sensor is extremely sensitive and easily interfered with. After the development and acceptance process, the inclination sensor is in the hands of the user. For high-precision instruments, users must first calibrate them before using them. The quality of the calibration results directly affects the output accuracy of the sensor, so calibration is also an important part of the application of inclination sensors.

[0003] In practice, the inventor has published a method for calibrating the tilt sensor (application number 202011460299.0). In this method, the tilt sensor is regarded as an ideal type. However, in practice, the sensor always has multiple errors, so this calibration method may contain these errors and cannot obtain the optimal result. At the same time, using its inherent error performance to help users calibrate is still a state of no interest. Summary of the invention

[0004] Technical issues to be solved

[0005] In order to avoid the shortcomings of the prior art, the present invention proposes a method for calibrating a tilt sensor by utilizing time drift stability.

[0006] Technical Solution

[0007] One of the important indicators of the inclination sensor is the time drift stability (abbreviated as time drift) caused by various factors. The time drift of the inclination sensor that has passed the acceptance reaches a good stable state. Furthermore, according to the relative position relationship between it and the true value, we can divide the steady state into two types: approach type and deviation type: the former approaches the true value, and the latter deviates from the true value.

[0008] Therefore, for these two different steady-state types, the calibration of the sensor should also be different: the approach-type inclination sensor should be calibrated under the steady-state state, while the deviation-type sensor should be calibrated at the starting moment of its normal output. In this way, different calibrations are adopted for the time drift steady-state error, which can minimize the error.

[0009] The specific method is characterized by:

[0010] (0) If the time drift types of the dual-axis inclination sensors are of the same type (both are deviation type or both are approach type), the calibration is completed according to (1) to (4). If they are mixed types (deviation type, approach type or approach type, deviation type), the calibration is completed according to (1) to (4) based on the deviation type:

[0011] (1) If the drift stability of the tilt sensor belongs to the approaching type, go to (2); otherwise, go to (3);

[0012] (2) The sensor is powered on during the calibration process and calibrated when the output is in a steady state, go to (4);

[0013] (3) The sensor is powered off before calibration and is powered on only when calibration is required. Calibration is performed at the start of the sensor's normal output.

[0014] (4)Return.

[0015] Beneficial Effects

[0016] The present invention proposes a method for calibrating a tilt sensor using time drift stability, which can achieve the following benefits for the calibration of ordinary tilt sensors:

[0017] 1. The principle is simple and easy to understand;

[0018] 2. Make full use of the time drift stability error index of the inclination sensor;

[0019] 3. Calibration achieves optimal accuracy;

[0020] 4. Achieve the best cost-effectiveness of expensive inclination sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0022] Figure 1A Schematic diagram of the application of the present invention;

[0023] Figure 1B Schematic diagram of the application of the present invention;

[0024] Figure 2 A specific embodiment diagram of using time drift stability to calibrate a tilt sensor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Example:

[0027] The schematic diagram of the embodiment of the present invention is shown in Figure 2 .

[0028] Two products of a certain type of inclination sensor used for leveling a certain project were tested by the manufacturer for acceptance. The results showed that the time drift stability indicators of the horizontal and vertical axes belonged to the deviation type, deviation type (serial number 13AI001 in April 2019) and deviation type, approach type (serial number 31AI001 in August 2019), respectively. The ordinary calibration method does not take this indicator into consideration and may include this error, resulting in a large deviation.

[0029] Now consider the time drift stability to calibrate the 13AI001 sensor. Since its horizontal and vertical axes are deviation type and deviation type, follow the steps below:

[0030] (0) If the time drift type of the dual-axis inclination sensor is all deviation type, complete the calibration according to (1) to (4):

[0031] (1) If the drift stability of the tilt sensor belongs to the approaching type, go to (2); otherwise, go to (3);

[0032] (2) The sensor is powered on during the calibration process and calibrated when the output is in a steady state, go to (4);

[0033] (3) The sensor is powered off before calibration and is powered on only when calibration is required. Calibration is performed at the start of the sensor's normal output.

[0034] (4)Return.

[0035] A certain type of inclination sensor (serial number 13AI001) was calibrated using the above method. Nearly a year of use showed that the leveling accuracy of the leveling subsystem was more than twice the required index, greatly improving the system level.

[0036] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A method for calibrating a tilt sensor using time drift stability, characterized in that Here are the steps: (0) If the time drift type of the dual-axis tilt sensor is of the same type, which is either a deviation type or an approach type, then the calibration is completed in accordance with (1) to (4). If it is a mixed type; the mixed type is a deviation type, an approach type, or a mixture of an approach type and a deviation type, then the deviation type shall prevail, and the horizontal and vertical axes of the dual-axis tilt sensor shall be calibrated in accordance with (1) to (4): (1) If the drift stability of the tilt sensor belongs to the approaching type, go to (2); otherwise, go to (3); (2) The sensor is powered on during the calibration process and calibrated when the output is in a steady state, go to (4); (3) The sensor is powered off before calibration and is powered on only when calibration is required. Calibration is performed at the start of the sensor's normal output. (4)Return.

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