High frequency Coriolis mass flowmeter digital signal processing system

Abstract

The invention relates to a high frequency Coriolis mass flowmeter digital signal processing system. The high frequency Coriolis mass flowmeter digital signal processing system comprises a DSP chip, a first signal conditioning module, a second signal conditioning module, a constant flow source, a Pt100 platinum resistor, a first ADC, a second ADC, a third ADC, an analog driver module, an external expansion FLASH module, a PWM output module, a current output module, an external expansion UART module, an HART modulation module, a man-machine interface module, a power down protection module and software. For signal processing of a high frequency Coriolis mass flow sensor, a TMS320C6726 chip with the strong operational capability and the high processing speed is used as a core processor, and the high frequency Coriolis mass flowmeter digital signal processing system is invented. Based on the zero-cross detection algorithm and DTFT algorithm, the high frequency Coriolis mass flowmeter digital signal processing system solves the problem that the algorithm cannot guarantee real-time performance after sampling frequency of high frequency sensor signals is increased.

Description

technical field [0001] The invention relates to the field of flow detection, and is a digital signal processing system of a Coriolis mass flowmeter, especially for the processing of high-frequency sensor signals, adopting the TMS320C6726 chip with powerful computing capability and high processing speed as the digital signal processing of the core processor system. Background technique [0002] Coriolis mass flowmeter (hereinafter referred to as Coriolis mass flowmeter) is the most researched and most promising direct mass flow measuring instrument. The Coriolis mass flowmeter consists of a primary instrument and a secondary instrument. The primary instrument includes a detection tube (or flow tube), a magnetoelectric speed sensor (or a photoelectric displacement sensor), an exciter and a temperature sensor; It is called a transmitter, which mainly includes a driving circuit, a signal conditioning circuit and a signal processing unit, and is mainly responsible for driving th...

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Problems solved by technology

However, due to the lack of SCI, PWM, FLASH and other modules inside the TMS320C6726 chip, and the lack of available GPIO ports, it also poses challenges to the realization of the huge Coriolis mass flow transmitter function to a certain extent.

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