Digital vortex street/precession flowmeter powered by battery
A vortex flowmeter, digital technology, applied in the direction of volume/mass flow, liquid/fluid solid measurement, volume measurement, etc. generated by mechanical effects, can solve problems such as large measurement error, poor anti-interference ability of field vibration, and small turndown ratio , to achieve the effect of low power consumption, good measurement accuracy, and accurate pulse counting
Inactive Publication Date: 2011-09-28
HEFEI UNIV OF TECH
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Problems solved by technology
In this way, when the flow rate changes relatively large, a large measurement error will occur
At the same time, current flowmeters of this type all use the processing methods of amplification, filtering, shaping and pulse counting, which have the defects of small range ratio and poor ability to resist on-site vibration interference.
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[0033] The present invention will be further described below in conjunction with the accompanying drawings.
[0034] The design concept of the present invention is: adopting the method of digital frequency spectrum analysis combined with band-pass filter, the anti-interference ability, measurement accuracy and range ratio of the instrument are improved, and the applicable range of the instrument is expanded through temperature and pressure compensation. However, the series needs to last for a year and a half on battery power. If a 3.6V, 6.5Ah battery is used for power supply, the average current consumed by the system must be lower than 500uA, which is far less than the current consumption of the full operation of the microcontroller and the signal conditioning and compensation circuits. Therefore, the following effective measures are adopted to reduce the power consumption of the system: (1) According to the actual voltage of the battery and the working state of the single-ch...
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The present invention relates to a digital vortex street / procession flowmeter powered by battery, comprising a piezoelectric sensor, a single operational amplifier differential charge amplifier, a voltage amplifier, a lowpass filter, a voltage follower, a band-pass filter group, a band-pass selection switching circuit, a wave shaping circuit, a singlechip, a man-machine interface circuit, a two-stage voltage conversion circuit, a controllable constant current source, a temperature sensor, a pressure sensor, a differential amplifier and a 16-bit A / D converter. Power supply of system is designed to be in two-stage conversion. Low power consumption singlechip is adopted to carry out less point rapid Fourier transform, periodic map analysis is realized, and frequency value of vortex street / procession signal is determined; a hardware band-pass filter group is designed, concrete band-pass filter is selected according to map analysis result, and optimal filtering is carried out; and the operational amplifier in the ungated band-pass filter is in unenabled state. Temperature and pressure compensation is set as intermittent sampling mode. At the sampling interval, a single-pole double-throw switch is utilized to cut off upper terminal voltage supply of the constant current source.
Description
technical field [0001] The invention relates to the field of flow detection, and is a low-power consumption digital vortex / precession vortex flowmeter, in particular, a battery-powered device with a single-chip microcomputer (MCU) as the core and a combination of periodic map analysis and hardware band-pass filter bank. Powered vortex / precession vortex flowmeter signal processing system. Background technique [0002] The Chinese invention patent announced an improved low-power two-wire vortex flowmeter (Xu Kejun, Liu Sanshan, Liu Jiaxiang, Luo Qinglin, Zhu Zhihai. The improved low-power two-wire vortex flowmeter applied for an invention patent, 200810246107.9, application date: 2008.12.22.). This improved low-power two-wire vortex flowmeter includes piezoelectric sensors, differential charge amplifiers, voltage amplifiers, program-controlled amplifiers, low-pass filters, voltage followers, band-pass filter banks, and band-pass selection switches. circuit, peak detection ci...
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IPC IPC(8): G01F1/32G01F15/00
Inventor 徐科军方敏王沁
Owner HEFEI UNIV OF TECH