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The AIS3000 series angle sensor has a smaller volume, better drop resistance, and vibration resistance than general gravity accelerometers.

Improvement of borehole inclinometer based on AIS3000 series inclination sensor. The new borehole inclinometer has been improved in the following aspects:

a. Replacing the universal gravity accelerometer with an AIS3000 tilt sensor results in improved performance in terms of volume, drop resistance, vibration resistance, and cost.

b. Replace the common three gravity accelerometers with an AIS3000 dual axis tilt sensor to simplify the installation structure. Due to the certain requirements for temperature characteristics, stability, and symmetry when measuring the inclination angle of the sensor, it is necessary to ensure the accuracy of the position as much as possible when installing the sensor, to ensure the consistency of the three axis positions during each measurement, and to avoid measurement errors caused by improper installation.

c. The AIS3000 tilt sensor is capable of measuring in all directions.

d. By analyzing the scatter plot using calibration data obtained from actual measurements, a regression model for estimating the inclination angle is derived. Use the proposed algorithm to compensate for errors in the data. AIS3000 sensor performance indicators.

AIS3000 high-precision dual axis tilt sensor has a small volume and light weight. The measurement range is 1 g, which is applied in inclinometers and has an over damping sensitive element to avoid the influence of vibration. By using separate temperature compensation and compensating for angle installation errors in inclined surfaces, measurements can be made very accurate. The range of AIS3000 dual axis tilt sensor is ± 90 degrees, and its characteristics are:

a. Dual axis tilt sensor; b. Measurement range ± 90 degrees; c. Built in temperature sensor; d. Long term stability performance indicators are better than 0.02 degrees, with strong impact resistance; e. High resolution, low noise, wide operating temperature range; f. Equipped with damping sensing elements, capable of withstanding mechanical vibrations greater than 20000 g.

There is a certain degree of error in the calculation results of the inclination angle measured by the inclination sensor used in the drilling inclinometer. However, it can be seen that the error distribution is quite regular:

a. The error distribution of all experimental results measured by the sensor three times is basically consistent, and the corresponding positive and negative half axes

The error changes very little.

b. During the process of changing the inclination angle from -90 to+90, there are two situations when the inclination angle is positive: between 0 and 40 degrees, the error gradually decreases as the angle increases. When the inclination angle is 40 degrees, the error value is the smallest. Between 50 and 90 degrees, the error gradually increases as the angle increases. When the inclination angle is 90 degrees, the error value is the largest. Calculate the maximum error value among the three measurement values. There are also two situations: when the inclination angle is between -90 and 50 degrees, the error gradually decreases as the angle decreases. When the inclination angle is between -90 degrees, the error value is the largest. Calculate the maximum error value among the three measurement values.; When the angle is between 40 and 0 degrees, the error gradually increases with the increase of angle. When the inclination angle is between 40 degrees, the error value is the smallest. Calculate the maximum error value among the three measurements.

c. According to the obtained data, there is a good linear relationship between the sensor output and angle when changing within ± 40 degrees, and when it is greater than ± 60 degrees. When there is a change, the output of the sensor slows down and the sensitivity decreases.

d. When the inclination angle is between 10 and 40 degrees, the error is always positive; When the inclination angle is between 50 and 80 degrees, the errors are all negative; When the inclination angle is between -90 and -50 degrees, the error is always positive; When the inclination angle is between -40 and 0 degrees, the errors are all negative; And the larger the difference between the inclination angle and ± 40 degrees, the greater the absolute value of the error. So the error distribution of measuring the inclination angle with an inclination sensor is very regular, so using error compensation technology can achieve good results.

Due to external factors such as measurement methods and experimental environments, random interference and errors are inevitably generated. In the analysis method of compensation function, data fitting and interpolation are both used to find the relationship between the independent variable and the dependent variable. When interpolation has errors in the initial data, it will also inherit its errors, and high-order interpolation will lead to increased computational complexity and poor overall trend. And fitting has good overall similarity and better trend than interpolation functions.

When fitting data, the determination of the relationship between independent and dependent variables is based on the theoretical relationship, and then transformed into a linear relationship as much as possible for fitting. Therefore, the determination of independent and dependent variables plays an important role in the accuracy of the compensation function. The AIS3000 dual axis inclination sensor is applied in the borehole inclinometer to measure the inclination angle. In engineering, it is required that the error compensation result should ensure that the actual error is as small as possible when the inclination angle is within ± 40 degrees.