Self-adaptive signal processing circuit of vortex flowmeter and signal processing method thereof
An adaptive signal, vortex flowmeter technology, applied in the field of flowmeter, can solve the problem of wrong identification of low-frequency interference signal, limited application, interference, etc., to avoid the decline of signal-to-noise ratio, accurate measurement of full aperture, anti-interference ability strong effect
Active Publication Date: 2015-04-01
上海肯特仪表股份有限公司
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Problems solved by technology
When this traditional vortex signal processing circuit processes the vortex signal with a range of 1:100, the low-frequency interference signal will be greatly amplified due to the fixed filtering frequency, so that the real vortex signal will be submerged, resulting in The detection circuit produces "wave loss" or "clipping", and even misidentifies the low-frequency interference signal as a flow signal, resulting in a sharp drop in the accuracy of the vortex signal, and the inherent strong nonlinearity of the limiting circuit will lead to signal harmonics. A large number of waves are generated, and each frequency component is intermodulated, which makes the signal spectrum deteriorate, interferes or even destroys the pickup of the real vortex signal frequency, and also reduces the accuracy of the vortex signal
Therefore, the traditional vortex signal processing circuit can only process vortex signals with a range of about 1:5, which limits its application and cannot directly achieve full-caliber accurate measurement
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[0016] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention.
[0017] Such as Figure 1-Figure 2 As shown, an adaptive signal processing circuit of a vortex flowmeter provided by an embodiment of the present invention includes a vortex flow sensor F, a variable frequency gain filter chip U3_F, a Schmitt trigger U4_FA, and a level conversion transistor Q1_F , the first shaping chip U5_FA, the second shaping chip U5_FF, the phase-locked loop chip U1_F and the counter U2_F;
[0018] The variable frequency gain filter chip U3_F is provided with a signal input terminal (pins 2, 3, 4), a signal output terminal (pins 13, 14, 15), a clock input terminal (pin 9) and a control voltage input termina...
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The invention discloses a self-adaptive signal processing circuit of a vortex shedding flowmeter and a signal processing method thereof, which relate to the technical field of flowmeters, and aim to solve the technical problems in expanding the measuring range and improving the anti-interference capacity and the measuring accuracy. The circuit comprises a vortex flow transducer, a variable frequency gain filter chip, a Schmidt trigger, a level conversion triode, a first shaping chip, a second shaping chip, a phase-locked ring chip and a counter, wherein output signals of the vortex flow transducer are divided into two paths of which one path is input into the variable frequency gain filter chip while the other path is input to the phase-locked ring chip through the Schmidt trigger, the level conversion triode and the first shaping chip in turn, then is converted into a frequency-doubled square wave by the phase-locked chip and the counter, and is input into a clock input end of the variable frequency gain filter; and the variable frequency gain filter chip self-adaptively changes the filter center frequency and the gain according to the received frequency-doubled square wave. The circuit and the method provided by the invention can realize a full aperture accurate measurement.
Description
technical field [0001] The invention relates to flowmeter technology, in particular to a technology of an adaptive signal processing circuit and a signal processing method of a vortex flowmeter. Background technique [0002] The vortex flowmeter is mainly used for the flow measurement of the medium fluid in the industrial pipeline. In the actual application, the vortex flowmeter will generally have a large gap in the signal spectrum due to the difference in the measurement of the gas-liquid medium, the on-site installation accuracy and the piping accuracy, and the lack of length of the straight pipe section. Strong low-frequency disturbance, other interference signals such as flow noise, resonance interference, pipeline mechanical vibration, etc. cover the entire signal spectrum range. Because the vortex flow signal has the characteristics of wide signal spectrum, wide range of travel ratio, and the strength of the vortex signal is proportional to the square of the frequency...
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IPC IPC(8): G01F1/32
Inventor王亚胜
Owner上海肯特仪表股份有限公司