Gyrometric Measurement Device Temperature Compensation
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Solution Overview
Problem
Existing rate gyro measurement devices face challenges in accurately compensating for temperature variations within the mechanical resonator without using a temperature probe, which would disrupt the device's operation, and require digital processing for frequency-to-temperature conversion, making them incompatible with existing analog systems.
Innovation Solution
A method and device where the gain control of the amplitude loop varies as a monotonic function of the internal resonator temperature, allowing for calibration and storage of gyro scale factor and bias values, enabling accurate temperature compensation through analog processing without a probe, using a processor to calculate the compensated rotation signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature probe is implanted on or in the resonator to detect temperature, then temperature measurement accuracy is improved, but the resonator vibration is disturbed and gyro measurement operation is spoiled
Solution Approach 1:
The patent uses the resonator's own vibration frequency as an intermediary parameter to infer temperature. Instead of directly measuring temperature with a probe that would disturb the system, the method monitors the resonator's vibration frequency, which varies predictably with temperature, thereby indirectly obtaining temperature information without physical contact or disturbance to the resonator's normal operation.
Solution Approach 2:
The patent replaces the mechanical/physical temperature probe system with an electronic signal processing system. By monitoring the resonator's vibration frequency through existing detection electrodes and processing the frequency information to determine temperature, the system eliminates the need for separate temperature sensing hardware that would physically interfere with the resonator.
2Reliability
If a temperature probe is placed close to the resonator without contact, then the resonator operation is not disturbed, but the temperature detection accuracy deteriorates because it measures surrounding temperature rather than resonator temperature
Solution Approach 1:
The resonator serves its own temperature measurement function by providing vibration frequency information that reflects its internal temperature. The resonator's inherent physical property (frequency-temperature relationship) is exploited to enable self-diagnosis of its thermal state without requiring external sensing elements, thereby maintaining operational stability while achieving accurate temperature measurement.
3Measurement precision
If frequency-to-temperature conversion is performed digitally, then temperature measurement accuracy is improved, but compatibility with existing analog gyro systems deteriorates
Solution Approach 1:
The patent replaces digital frequency-to-temperature conversion with an analog implementation. By using analog circuitry to process the resonator's vibration frequency signal and directly generate the corresponding temperature compensation signal, the system maintains full compatibility with existing analog gyro architectures while achieving accurate temperature measurement and compensation, thereby avoiding the need for digital conversion stages.
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
This approach provides more accurate and simpler temperature compensation, improving measurement performance and stability over a range of -40°C to +85°C, specifically for resonators with vibrating beams, without the need for digital conversion or probes, ensuring compatibility with analog systems.
Implementation Method 1
the frequency of vibration of the beams varies linearly as a function of temperature
Implementation Method 2
a loop for controlling the amplitude of the vibration of the mechanical resonator
Data Source
AI summary
The invention concerns gyrometric measurement compensated as a function of the instantaneous internal temperature of a mechanical resonator in a gyrometric measurement device comprising a loop controlling the amplitude of the resonator vibration and a gyrometric loop delivering a gyrometric signal (S); the gain control (P) of the loop varies as a monotonous function, preferably increasing and of the first order, of the internal temperature of the resonator in a given range of temperature; during a calibrating step, a correspondence is established and stored between the values of the gyrometric scaling factor (Fe) and the gyrometric bias (S0) and the values of the gain control signal (F), that is F(P) and Q(P) respectively; in operation, the following operations are carried out: P→F(P), P→Q(P), and Ω′est=F(P)·S+Q(P) which is a more precise analog estimate, compensated as a function of the internal temperature of the resonator, of the mechanical rotation of the sensitive axis of the resonator.