Coriolis mass flow meter cloud transmission digital signal processing device and method

A technology of digital signal processing and mass flowmeter, which is applied in mass flow measurement devices, direct mass flowmeters, signal transmission systems, etc., and can solve problems such as low precision, high cost, and spectrum leakage

Inactive Publication Date: 2014-01-22
SHANDONG UNIV
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Problems solved by technology

This method realizes real-time frequency tracking, but there is a spectrum leakage problem in phase difference calculation when non-full-period sampling occurs, which affects measurement accuracy
[0003] The existing Coriolis mass flowmeter signal processing method has the problems of low precision, low real-time performance and high cost

Method used

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  • Coriolis mass flow meter cloud transmission digital signal processing device and method
  • Coriolis mass flow meter cloud transmission digital signal processing device and method
  • Coriolis mass flow meter cloud transmission digital signal processing device and method

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Embodiment Construction

[0096] The present invention is described in detail below in conjunction with accompanying drawing:

[0097] Such as figure 1 As shown, the Coriolis mass flowmeter (hereinafter referred to as the Coriolis mass flowmeter) can directly measure the mass flow with high measurement accuracy and broad application prospects. Coriolis flowmeters are divided into straight tube type and curved tube type according to their structure. The invention patent will be designed with a double U-tube Coriolis mass flowmeter as an example.

[0098] The working principle of the Coriolis flowmeter is described as follows: When a fluid flows through the measuring tube of the flowmeter, when the vibration frequency of the measuring tube is constant, there will be a phase difference between the two sine wave signals flowing into and out of the measuring tube, and the phase difference Proportional to the mass flow rate of fluid flowing through the measuring tube. Therefore, the key to the Coriolis ma...

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Abstract

The invention discloses a Coriolis mass flow meter cloud transmission digital signal processing device and method. The device comprises a Coriolis mass flow meter, wherein the Coriolis mass flow meter is provided with two magnetoelectricity sensors, a driver and a constant flow source, the two magnetoelectricity sensors transmit collected signals to a differential amplification circuit corresponding to the magnetoelectricity sensors, the differential amplification circuit transmits processed signals to a DSP through an AD sampling circuit corresponding to the differential amplification circuit, and the driver is in communicating connection with the DSP through a feedback type digital driving module. According to the method, digital driving is conducted by means of the feedback type non-linear gain control algorithm fast and stably, frequency is tracked with the Newton LMS algorithm in an adaptive mode timely and accurately with the accuracy capable of reaching 0.01%, and the accuracy of calculation of phase difference achieved by means of the DTFT algorithm with a temperature compensation function can reach the 0.02% industrial level. Therefore, the digital signal processing algorithm is a Coriolis mass flow meter signal processing method with high accuracy and strong timeliness.

Description

technical field [0001] The invention relates to a digital signal processing device and method for cloud transmission of a Coriolis mass flowmeter. Background technique [0002] Because the Coriolis mass flowmeter works based on the principle of fluid vibration, the vibration frequency of the tube is affected by the fluid density, etc., the secondary instrument measurement is the phase difference of the synthetic wave, and the analog circuit is sensitive to external noise, thus reducing the measurement accuracy . In order to improve the accuracy and anti-interference ability of Coriolis mass flowmeters, the common practice of R&D institutions and engineers at home and abroad is to apply digital signal processing algorithms to the signal processing process of Coriolis mass flowmeters. For example, the Chinese patent CN101832803B uses a synchronous modulation method to calculate the vibration frequency through a zero-crossing comparison method, thereby calculating the phase di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/84G01F15/02G08C17/02
Inventor 高瑞朱邱悦赵代岳张岩朱慧敏高璐璐
Owner SHANDONG UNIV
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