Micro-probe ultrasonic Doppler velocimeter control circuit and signal processing method
A technology of Doppler flow meter and control circuit, which is applied in the direction of fluid velocity measurement, instrument, velocity/acceleration/shock measurement, etc. It can solve the problems of insufficient processing efficiency and precision of sending and receiving signals, achieve good emission resonance, and accelerate sampling frequency , Equipment reliable and stable effect
Inactive Publication Date: 2017-02-01
XIAMEN BOYIDA TECH
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The processing and calculation process of the above ultrasonic signals are all completed by the control circuit and related software in the circuit board. At present, the processing efficiency and accuracy of the control circuit for sending and receiving signals are not high enough.
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[0029] Such as figure 1 As shown, the control circuit of the microprobe ultrasonic Doppler current meter disclosed by the present invention includes a central processing unit 1, a low-pass filter 5, a modulation / demodulation module 2, a VGA circuit 14, a band-pass filter amplifier 3, a front Amplifier 4, DDS module 6 and power amplification module 7, described central processing unit 1 includes ADC module 1a, FFT module 1b and DSP module 1d;
[0030] Preamplifier 4, band-pass filter amplifier 5, VGA circuit 14, modulation / demodulation module 2, low-pass filter 5, ADC module 1a (analog-to-digital conversion module), FFT module 1b (fast Fourier transform module) and DSP module 1d is connected sequentially;
[0031] The power amplification module 7 , the DDS module 6 and the DSP module 1 d are connected in sequence, and the power amplification module 7 is also connected to the modulation / demodulation module 2 .
[0032] When the control circuit of the microprobe ultrasonic Dopp...
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The invention discloses a micro-probe ultrasonic Doppler velocimeter control circuit and a signal processing method. The control circuit comprises a central processor, a low-pass filter, a modulation / demodulation module, a VGA circuit, a band-pass filter amplifier, a preamplifier, a DDS module and a power amplification module. The central processor comprises an ADC module, an FFT module and a DSP module. The preamplifier, the band-pass filter amplifier, the VGA circuit, the modulation / demodulation module, the low-pass filter, the ADC module, the FFT module and the DSP module are connected in sequence; the power amplification module, the DDS module and the DSP module are connected in sequence; and the power amplification module is also connected with the modulation / demodulation module. The method improves signal processing efficiency and precision of the micro-probe ultrasonic Doppler velocimeter.
Description
technical field [0001] The invention relates to the technical field of ultrasonic flow meters, in particular to a control circuit of a microprobe ultrasonic Doppler flow meter and a signal processing method thereof. Background technique [0002] Ultrasonic Doppler Velocimeter uses the principle of Doppler effect and uses ultrasonic transducers as sensors. One of the ultrasonic transducers is responsible for emitting sound waves. The sound waves are reflected by reflectors such as sediment particles and plankton that are unevenly distributed in the water body. The acoustic reflection signal is received by another or more ultrasonic transducers, and the signal is processed by the relevant circuit to determine the Doppler frequency shift and then calculate the flow velocity. The above-mentioned ultrasonic signal processing and measurement process are all completed by the control circuit and related software in the circuit board. At present, the processing efficiency and accurac...
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IPC IPC(8): G01P5/24
CPCG01P5/241
Inventor 夏文军
Owner XIAMEN BOYIDA TECH