Tunable Amplifier Gain Control for Oscillatory Flow Sensors
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Solution Overview
Problem
Existing measuring devices using oscillatory forks face issues with amplitude-dependent phase shifting, non-linearity, signal-noise separation, and saturation due to varying amplitudes of input signals when the oscillatable unit is covered or uncovered by a medium, requiring dynamic range adjustment in amplifiers.
Innovation Solution
The amplification factors of both input and output amplifiers are tunable, with the control unit adjusting them based on the damping by the medium to keep the input signal amplitude within a predeterminable range, ensuring the total amplification factor remains constant, and the output amplifier's factor increases with greater damping and decreases with lesser damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the amplification factor is designed to cover the full dynamic range, then the amplifier can handle both large and small amplitudes, but the amplifier becomes complex and requires extensive dynamic range design
Solution Approach 1:
The amplification factor is made dynamically adjustable through a control unit that automatically adapts the gain based on the detected amplitude of the input signal. This allows the amplifier to switch between high-gain mode (for small amplitudes when the oscillatable unit is covered by medium) and low-gain mode (for large amplitudes when uncovered), eliminating the need for a complex amplifier designed to handle the entire dynamic range simultaneously.
2Measurement precision
If the amplification factor is increased to amplify small signals, then signal-noise separation improves, but amplitude-dependent phase shifting and non-linearity increase
Solution Approach 1:
The system dynamically adjusts the amplification factor based on the input signal amplitude. When the oscillatable unit is covered by medium and produces small signals, high amplification is applied to improve signal-noise separation. When uncovered and producing large signals, low amplification is applied to avoid phase shifting and non-linearity. This dynamic adaptation ensures both measurement precision and reliability are maintained across different operating conditions.
3Reliability
If the amplification factor is decreased to avoid saturation, then non-linearity is reduced, but signal-noise separation deteriorates
Solution Approach 1:
The control unit monitors the amplitude of the input signal and automatically adjusts the amplification factor of the output amplifier. When small input amplitudes are detected (oscillatable unit covered by medium), the amplification factor is increased to enhance signal-noise separation. When large input amplitudes are detected (oscillatable unit uncovered), the amplification factor is decreased to prevent saturation and maintain linearity. This dynamic gain control resolves the contradiction between signal-noise separation and signal linearity.
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 maintains the input signal amplitude within a desired range, independent of the medium's coverage, reducing the need for extensive dynamic range design in amplifiers and ensuring consistent measurement accuracy across varying conditions.
Implementation Method 1
at least one exciting/receiving unit, which excites the mechanically oscillatable unit, such that it executes mechanical oscillations, and which receives mechanical oscillations of the mechanically oscillatable unit
Implementation Method 2
the amplitude of the input signals SR of the electronics unit, thus the received signals from the mechanically oscillatable unit, can differ widely. For instance, if the oscillatable unit is oscillating not covered by the medium, then a large amplitude results, while, when the oscillatable unit is covered by the medium, then the amplitude decreases
Data Source
AI summary
An apparatus including: a mechanically oscillatable unit; an exciting/receiving unit; and an electronics unit having an input amplifier and an output amplifier. The amplification factors of the output amplifier and the input amplifier are tunable. The control unit tunes the amplification factor of the output amplifier as a function of damping of the mechanically oscillatable unit in such a manner that the amplitude of the electrical, input signal lies within an amplitude band and that the amplification factor of the output amplifier decreases in the case of lessened damping by the medium and increases in the case of greater damping by the medium, and the control unit tunes the amplification factor of the output amplifier and the amplification factor of the input amplifier in such a manner that the total amplification factor of the electronics unit equals a predeterminable value.