Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof
An electromagnetic flowmeter and narrow-band filtering technology, which is applied to the application of electromagnetic flowmeters to detect fluid flow, measure capacity, volume measurement, etc., can solve the problems of low accuracy, poor resolution of micro-flow electromagnetic flowmeters, and low signal-to-noise ratio. problems, to achieve the effect of improving reliability, improving performance indicators, and increasing the amount of information
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0034] With reference to the drawings, preferred specific embodiments of the present invention will be described in detail.
[0035] As attached figure 1 Among them, a narrow-band filtered micro-flow electromagnetic flowmeter, which consists of: an instrument case 1. The instrument case is equipped with a circuit board, and the circuit board includes an input signal conditioning circuit 2, an excitation drive circuit 6 and a power supply Circuit 7. The input signal conditioning circuit is connected to the A / D converter 3, the A / D converter is connected to the microprocessor 5, and the microprocessor is connected to the display 8 and the demodulation control circuit 5 respectively. Connection, the demodulation control circuit is connected to the excitation drive circuit 6.
Embodiment 2
[0037] In the narrow-band filtered micro-flow electromagnetic flowmeter in embodiment 1, the input signal conditioning circuit includes: a preamplifier circuit, a narrowband filter circuit, a signal demodulation circuit, and a low-pass amplifier circuit. The components are connected as follows figure 2 . The lines with the same label between each device have a connection relationship.
[0038] For the narrow-band filtered micro-flow electromagnetic flowmeter, the A / D converter can be the ICL7135 single-chip dual-integral analog-to-digital converter of INTERSIL Corporation of the United States, or other alternative devices.
[0039] For the narrow-band filtered micro-flow electromagnetic flowmeter, the microprocessor can adopt the MSP430 single-chip microcomputer of Hong Kong TI Company, or adopt other alternative devices.
[0040] In the narrow-band filtered micro-flow electromagnetic flowmeter, the demodulation control circuit is implemented by the functional unit and software prog...
Embodiment 3
[0044] The micro-flow electromagnetic flowmeter detects the induced electromotive force (flow signal) output between the electrodes, and obtains the flow rate signal through pre-amplification, narrow-band filtering, signal demodulation and low-pass amplifying circuit, and then sends it to the A / D circuit to convert it into a digital quantity. Then it is connected to the microprocessor for processing and integration to obtain fluid velocity (m / s), instantaneous flow (cubic meters / hour), cumulative flow (cubic meters) and other fluid parameters, which are transmitted to the display circuit in the form of program codes , Chinese characters are displayed on the graphic LCD screen. At the same time, the internal functional unit and software program of the microprocessor generate the pulse signal that controls the direction of the excitation current conversion and the pulse signal that controls the operation of the signal demodulation circuit, and drives the excitation coil of the mic...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More