Tilt Detecting Device Self-Calibration via 180-Degree Reversal
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Solution Overview
Problem
Existing tilt detecting devices face challenges in achieving high responsiveness and stability, particularly in dynamic environments, due to drift caused by environmental changes and lack of sensitivity calibration, which affects the accuracy of tilt measurements in precision devices like surveying instruments.
Innovation Solution
A tilt detecting device with a gimbal mechanism, incorporating a tilt sensor, encoders, and motors, where an arithmetic processing module controls the motors to rotate the tilt detecting unit and perform calibration based on encoder outputs, ensuring accurate detection of horizontality and verticality, and correcting for drift by reversing the tilt detecting unit and recalibrating the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tilt sensor is used to detect highly accurate horizontality, then measurement precision is improved, but responsiveness deteriorates
Solution Approach 1:
The patent combines a tilt sensor (for high precision horizontality detection) with an acceleration sensor (for high responsiveness) into a single attitude detecting device. The tilt sensor measures accurate tilt angles while the acceleration sensor provides rapid response to dynamic changes, and both sensors work together to achieve both high precision and high responsiveness simultaneously.
2Speed
If an acceleration sensor is used to guarantee high responsiveness, then speed is improved, but stability deteriorates due to drift
Solution Approach 1:
The patent implements a feedback mechanism where the tilt sensor continuously monitors the actual tilt angle and provides correction signals to compensate for drift in the acceleration sensor. The system uses the stable tilt sensor readings as a reference to correct the drifting acceleration sensor outputs, maintaining both responsiveness and stability over time.
Solution Approach 2:
The patent changes the operational parameters of the acceleration sensor by using tilt sensor data to adjust and correct the acceleration sensor's output parameters. This parameter correction approach allows the system to maintain the acceleration sensor's high responsiveness while eliminating its drift instability through continuous parameter adjustment based on tilt sensor feedback.
3Measurement precision
If calibration is performed using external equipment, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service calibration where the attitude detecting device calibrates itself using its own tilt sensor and acceleration sensor without requiring external calibration equipment. The system automatically performs calibration by analyzing the relationship between tilt sensor readings and acceleration sensor outputs, eliminating the need for external level instruments or vertical collimators and making calibration simple and convenient.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables easy and efficient calibration of the tilt detecting device during measurement, maintaining high accuracy and stability by correcting for drift and ensuring continuous sensitivity calibration, thereby improving the responsiveness and reliability of tilt measurements in dynamic conditions.
Implementation Method 1
a tilt sensor which detects a tilt from the horizontality
Implementation Method 2
the tilt sensor is an acceleration sensor
Implementation Method 3
a first encoder which is provided on the first shaft and detects a rotation angle between the outer frame and the inner frame, a second encoder which is provided on the second shaft and detects a rotation angle between the inner frame and the tilt detecting unit
Data Source
AI summary
A tilt detecting unit has a tilt sensor and is rotatably supported by an inner frame through a second shaft orthogonal to a first shaft, a first encoder is provided on the first shaft, a second encoder is provided on the second shaft, motors are provided on the respective shafts, an arithmetic processing module drives the respective motors so that the tilt sensor detects the horizontality based on a signal issued by the tilt sensor, calculates a tilt of the outer frame based on the outputs from the first and second encoders when the tilt sensor detects the horizontality, reverses the tilt detecting unit 180° at least once based on the outputs from the respective encoders in a stationary state of the tilt detecting device, and performs the calibration of the tilt sensor based on the detection signals output from the tilt sensor before and after the reversal.