Vibrating Beam Sensor Temperature Compensation via Torsional Resonator
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Solution Overview
Problem
Vibrating beam sensors face precision degradation due to rapid temperature variations, which existing technologies fail to adequately address, leading to inaccurate measurements in applications requiring high precision.
Innovation Solution
A device with a torsionally vibrating resonator is integrated into the vibrating beam sensor, where the resonator's frequency is sensitive to temperature changes but not to axial forces, allowing for effective compensation of temperature effects on the sensor's frequency, enabling precise temperature measurement and variation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single vibrating beam is used as the sensor element, then the device structure is simple, but the measurement precision degrades under rapid temperature variations
Solution Approach 1:
The sensor is divided into two functionally independent parts: a vibrating beam for measuring axial forces and a torsionally vibrating resonator for measuring temperature. This segmentation allows each element to specialize in its measurement function, with the resonator providing temperature compensation data without interfering with the beam's force measurement capability.
Solution Approach 2:
The torsionally vibrating resonator acts as an intermediary element that indirectly measures temperature effects on the beam. Instead of directly measuring beam temperature, the resonator's frequency, which is highly sensitive to temperature, serves as a proxy indicator that is then used to compensate the beam's frequency measurements through calibration models.
2Measurement precision
If additional temperature compensation elements are added to the sensor, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The resonator is designed to vibrate torsionally at a frequency substantially different from the beam's flexural vibration frequency. This parameter differentiation (frequency separation) allows both elements to operate simultaneously without mutual interference, enabling temperature compensation while maintaining structural simplicity.
Solution Approach 2:
The solution employs mechanical vibration in two distinct modes: flexural vibration of the beam for force measurement and torsional vibration of the resonator for temperature measurement. By utilizing different vibration modes and frequencies, the system achieves sophisticated temperature compensation without requiring complex mechanical structures or multiple sensors.
3Device complexity
If the resonator frequency is made close to the beam frequency, then the device structure is simpler, but vibration interference occurs between the two elements
Solution Approach 1:
The resonator is specifically designed to vibrate torsionally at a frequency substantially different from the beam's flexural vibration frequency. This frequency separation prevents resonant coupling and mutual interference between the two vibrating elements, allowing them to operate independently and simultaneously without degrading each other's measurement accuracy.
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 solution significantly improves the precision of vibrating beam sensor measurements by accurately compensating for temperature and its variations, even during rapid changes, thereby enhancing the sensor's performance in high-precision applications.
Implementation Method 1
a resonator vibrating torsionally in resonance mode and having a torsional vibration node
Implementation Method 2
the resonance frequency of which, as a function of the temperature, is known
Implementation Method 3
said fixing permitting heat transfer between the resonator and the beam
Implementation Method 4
vibrating beam sensors, which use the sensitivity of the resonance frequency of a vibrating beam to a force exerted along its longitudinal axis
Implementation Method 5
the input quantity to be measured by the sensor is, for example, a force, a pressure or an acceleration
Data Source
AI summary
The invention is a device for measuring the temperature of the vibrating beam of a vibrating-beam sensor. It comprises a resonator (10) vibrating in torsion in resonant mode and exhibiting a torsional vibration node (N), said node being its zone of fixing in the vicinity of the middle of the length (L3) of the vibrating beam, said fixing allowing thermal transfers between the resonator and the beam. The frequency of the resonator and the variations of this frequency are representative respectively of the mean temperature T of the beam and of the variations of this temperature T, the effects of which may be compensated by a model.