Vibration Transducer Sensor Positioning for Mass Flow Accuracy
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Solution Overview
Problem
Conventional vibration-type measuring transducers require high electrical power for achieving accurate mass flow measurements, leading to increased susceptibility to disturbance vibrations and limited signal-to-noise ratio, especially at low mass flow rates.
Innovation Solution
The transducer design includes oscillation sensors placed closer to the site of maximum oscillation amplitude, optimizing the measuring length to achieve high sensitivity and signal-to-noise ratio with reduced electrical excitation power by positioning sensors to maximize the product of actual sensitivity and signal amplitude relative to theoretical maximum values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high electrical power is used for excitation, then measurement accuracy is improved, but susceptibility to disturbance vibrations increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent changes the spatial parameter of sensor positioning along the measuring tube. By placing sensors at specific positions (not at the ends but at intermediate positions where oscillation amplitude is maximized), the system achieves high measurement accuracy with reduced excitation power, thereby avoiding disturbance vibrations while maintaining signal quality.
Solution Approach 2:
The patent replaces the conventional end-positioned sensor arrangement with an optimized intermediate-positioned sensor arrangement. This substitution of mechanical configuration allows the system to achieve better measurement performance with lower excitation energy, reducing the harmful effects of high power excitation.
2Power
If high electrical power is used for excitation, then signal amplitude is increased, but signal-to-noise ratio is limited
Solution Approach 1:
The patent optimizes the spatial parameter of sensor positioning to maximize the product of actual sensitivity and signal amplitude. By placing sensors at intermediate positions where the measuring tube exhibits maximum oscillation amplitude, the system achieves high signal-to-noise ratio with reduced excitation power, preventing information loss.
3Length of moving object
If sensors are placed at the ends of the measuring tube, then measuring length is maximized, but sensitivity and signal amplitude are reduced
Solution Approach 1:
The patent optimizes the spatial parameter of sensor positioning by placing sensors at intermediate positions along the measuring tube rather than at the ends. This positioning achieves maximum oscillation amplitude, thereby maximizing the product of sensitivity and signal amplitude while maintaining an appropriate measuring length for accurate mass flow measurement.
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 design enables accurate mass flow measurement with low excitation power, reducing disturbance susceptibility and enhancing signal quality, suitable for systems with limited power and low mass flow rates.
Implementation Method 1
an oscillation exciter (51), which serves to generate oscillations in the at least one measuring tube (10)
Implementation Method 2
a sensor arrangement (50), which serves to register the oscillations of the measuring tube (10), with an oscillation sensor (51, 52) arranged on the measuring tube (10)
Implementation Method 3
the at least one measuring tube (10), which extends with an oscillatory length (L10) between an inlet-side, first measuring tube end (11#) and an outlet-side, second measuring tube end (12#), and which during operation oscillates (especially in a bending oscillation mode) about an oscillation axis
Implementation Method 4
induce reaction forces (for example Coriolis forces) in flowing media
Data Source
AI summary
A measuring transducer comprising at least one measuring tube for conveying a flowing medium. The measuring tube vibrates at least at times during operation. A sensor arrangement, which serves to register oscillations of the at least one measuring tube. The measuring tube extends with an oscillatory length between an inlet-side, first measuring tube end, and an outlet-side, second measuring tube end, and, during operation, oscillates about an oscillation axis, which is parallel to or coincides with an imagined connecting axis which imaginarily connects the two measuring tube ends. By means of a first oscillation sensor, the sensor arrangement produces a first primary signal of the measuring transducer representing vibrations of the measuring tube, and by means of a second oscillation sensor the sensor arrangement produces a second primary signal of the measuring transducer representing vibrations of the measuring tube, wherein a length of a region of the first measuring tube extending between the first oscillation sensor and the second oscillation sensor defines a measuring length of the measuring transducer. The oscillation sensors of the sensor arrangement are placed in the measuring transducer in such a way that a measuring transducer sensitivity, SACT, referenced to a theoretical sensitivity at a maximum measuring length corresponding to the oscillatory length, as well as a signal amplitude, of the primary signals actually achieved during operation, referenced to a theoretically maximum possible signal amplitude, AMAX, at the location of maximum oscillation amplitude, fulfill the conditionℛ=AACTAMAX·SACTSMAX=!Max.