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Why is differential type used for mutual inductance sensors?
Adopting a differential structure:
1. It can improve nonlinearity, enhance sensitivity, and improve measurement accuracy.
.2、 Why is it generally necessary to improve anti-interference ability? After all, inductive sensors are more susceptible to external interference. The differential flow sensor structure has two vibration points with a phase difference of 180 ° at the axisymmetric point at the junction of the diffusion section and the straight pipe section for a rotary flow meter; The vortex flowmeter has two vibration points with a phase difference of 180 ° at the axisymmetric point in front of the blunt body, where the fluid vibration intensity is strongest. Therefore, as long as two sensors or differential sensors are installed in this position and the output charge signal is differentially amplified, the voltage signal with twice the amplitude of a single sensor can be obtained. At this point, the output frequency is consistent with the fluid vibration frequency, which is beneficial for improving the lower limit sensitivity of the flowmeter. However, when there is no fluid passing through the flowmeter, if there are fluctuations or mechanical vibrations in the pressure of the medium inside the pipeline, the differential sensor adopts an integrated rigid connection. When the flow signal and interference signal coexist, the flow sensor of this structure can also eliminate the interference signal and detect the fluid vibration signal.
2. Types and principles of flow meters
Flow meters can be divided into the following categories based on measurement principles:
1. Mechanical principles: Instruments belonging
2、 Electrical principles: Instruments used for this type of principle include electromagnetic, differential capacitive, inductive, strain resistance, etc.
3、 Acoustic principles: There are ultrasonic and acoustic (shock wave) methods that use acoustic principles for flow measurement.
4、 Thermal principles: There are various methods for measuring flow rate using thermal principles, such as calorimetry, direct calorimetry, and indirect calorimetry.
5、 Optical principles: Instruments such as laser and photoelectric instruments belong to this type of principle.
6、 Atomic physics principles: Nuclear magnetic resonance, nuclear radiation, etc. are instruments belonging to this type of principle.
7. Other principles include labeling principles (tracer principle, nuclear magnetic resonance principle), related principles, etc. Extended Data Flow Meter Market Factor: Driving Factors According to the International Energy Agency (IEA) forecast, a cumulative global investment of $26.0 trillion (in 2007 US dollars) is needed in energy infrastructure from 2007 to 2030. In the long run, foreseeable energy investment will bring considerable development space for the application of flow meters in the oil and gas and energy industries. Faced with a fierce competitive environment, in order to meet t
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