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A Coriolis mass flowmeter anti-high temperature analog drive circuit

A technology of mass flowmeter and driving circuit, which is applied in the directions of direct mass flowmeter, mass flow measuring device, measuring flow/mass flow, etc. It can solve the problems of driving signal amplitude and sensor signal amplitude drift, etc., and solve the problem of sensor signal The effect of amplitude drift

Active Publication Date: 2018-08-24
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the Coriolis mass flow transmitter works in a high temperature environment, the driving signal amplitude and the sensor signal amplitude drift caused by the analog drive circuit being affected by the ambient temperature, the present invention is based on the existing Coriolis mass flowmeter The framework of the analog drive circuit, redesign the two circuit links of precision rectification and low-pass filter, and develop a high temperature resistant analog drive circuit for Coriolis mass flowmeter

Method used

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  • A Coriolis mass flowmeter anti-high temperature analog drive circuit
  • A Coriolis mass flowmeter anti-high temperature analog drive circuit
  • A Coriolis mass flowmeter anti-high temperature analog drive circuit

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] figure 1 It is a block diagram of the circuit hardware composition of the existing analog drive system. The analog drive circuit consists of six parts: voltage follower, precision rectifier, gain control, multiplication amplifier, drive protection and power amplifier. The output signal of the magnetoelectric speed sensor is divided into two channels after voltage following, amplification and filtering. The two signals are processed separately. Perform precision rectification on one of the signals to obtain the amplitude information of the sensor signal, and then obtain the gain required by the driving signal through the gain control link of the subsequent stage, and then send it to one end of the multiplier; use the other signal as the driving signal. The required waveform information is directly sent to the other end of the multiplier. In this way, the two signa...

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Abstract

The invention relates to the field of flow detection and discloses a high temperature-resisting simulation driving circuit for a Coriolis mass flow meter. On the basis of the present simulation driving circuit for the Coriolis mass flow meter, a precise rectifying circuit and a low-pass filtering circuit are redesigned, the high temperature-resisting simulation driving circuit for the Coriolis mass flow meter is researched and developed, and the problem of amplitude shift in the high temperature environment of the present simulation driving circuit is effectively solved.

Description

technical field [0001] The invention relates to the field of flow detection, and is a high-temperature-resistant analog drive circuit for a Coriolis mass flowmeter, in particular to a precision rectification circuit and an active second-order low-pass filter circuit in the analog drive circuit for a Coriolis mass flowmeter. Background technique [0002] The Coriolis mass flowmeter is used for direct measurement of fluid mass flow, with high measurement accuracy and good repeatability, and it can also simultaneously realize the measurement of fluid volume flow, density, temperature and other parameters under different fluid conditions, and has a wide range of applications prospect. The Coriolis mass flowmeter consists of a primary instrument (or a Coriolis mass flow sensor) and a secondary instrument (or a Coriolis mass flow transmitter, referred to as a transmitter). The primary instrument includes a flow tube, drive coil, pickup coil (magnetic speed sensor) and temperature...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/84
CPCG01F1/8422G01F1/8431
Inventor 徐科军刘铮方正余张建国
Owner HEFEI UNIV OF TECH