Torque Balance Accelerometer Internal Temperature Compensation
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Solution Overview
Problem
Existing torque balance accelerometers require external temperature compensation, which is time-consuming and requires specialized equipment and expertise, limiting their accuracy over a wide temperature range in applications like high-end inertial guidance and oil well drilling.
Innovation Solution
Integration of digital processing and memory capabilities into the accelerometer allows for factory calibration of scale and offset correction factors across various temperatures, enabling internal temperature compensation through a microprocessor and digital to analog conversion, thus eliminating the need for external calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external temperature compensation is used, then temperature accuracy can be corrected, but calibration time and user burden increase significantly
Solution Approach 1:
The patent performs temperature compensation calibration in advance during factory manufacturing. Multiple temperature points are pre-calibrated and the correction data is stored in the accelerometer's internal memory. When the device is used, it automatically retrieves the appropriate calibration data based on measured temperature, eliminating the need for users to perform time-consuming external calibration procedures.
2Measurement precision
If external temperature compensation equipment is used, then accurate calibration can be achieved, but device complexity and cost increase
Solution Approach 1:
The patent integrates temperature compensation functionality directly into the accelerometer device. The temperature sensor, calibration data storage memory, and processing logic are merged within the accelerometer housing. This eliminates the need for separate external calibration equipment and reduces overall system complexity while maintaining calibration accuracy.
Solution Approach 2:
The accelerometer performs its own temperature compensation using internal components. The device measures its own temperature via an integrated temperature sensor, retrieves corresponding calibration data from its internal memory, and automatically applies corrections to its output signals. This self-service approach eliminates dependency on external calibration systems.
3Ease of operation
If factory calibration is performed, then user burden is reduced, but manufacturing process complexity increases
Solution Approach 1:
The patent performs comprehensive temperature calibration during the factory manufacturing process. The accelerometer is subjected to multiple temperature conditions, calibration measurements are taken at each temperature point, and the resulting correction data is stored in the device's internal memory before shipment. This preliminary action transfers the calibration burden from the user to the manufacturer.
Data Source
AI summary
Systems and methods are disclosed for generating temperature compensated acceleration data in analog and digital format from a torque balance accelerometer (TBA). During manufacture of the TBA, a calibration process is used for measuring a TBA scale factor and offset. After collecting scale and offset data, said data is loaded into the memory of the TBA. Field operation of the device includes: sensing a current temperature, retrieving the closest scale and offset correction factors from memory of the TBA, and performing linear interpolation to generate a temperature-compensated output for the TBA.