An Ultrasonic Control Method Combining Amplitude and Pulse Width Modulation

Abstract

The invention discloses an ultrasonic wave control method combining amplitude and pulse width modulation. The ultrasonic wave control method comprises an ultrasonic wave generating module, an ultrasonic receiving module, a micro-processing module and a time pulse width acquisition module. The ultrasonic control method comprises the following steps that 1) the micro-processing module controls the ultrasonic generating module to generate ultrasonic signals; 2) the ultrasonic receiving module and the time pulse width acquisition module receive the ultrasonic signals; 3) the ultrasonic amplitude is adjusted through a waveform gain control circuit; and 4) the time pulse width acquisition module generates waveform pulse width after receiving the ultrasonic signals, the micro-processing module collects waveform pulse width and then operates the pulse width modulation algorithm, and the ultrasonic amplitude is further adjusted through the waveform gain control circuit. According to the method,the waveform amplitude is controlled within a set range through amplitude control, so that the cross-wave risk of pulse width adjustment is prevented; and the ultrasonic waves are accurately controlled through pulse width modulation, so that the effect of mutually compensating the defects is achieved.

Description

technical field [0001] The invention relates to the technical field of ultrasonic instruments, in particular to an ultrasonic control method combining amplitude and pulse width modulation. Background technique [0002] With the improvement of people's awareness of environmental protection in recent years, natural gas has been used more and more as a clean and high-quality energy, and the development of the natural gas industry has become faster and faster. The main measuring instruments in the natural gas industry are Roots meters and turbine meters. However, these traditional instruments have shortcomings such as high requirements for metering quality, frequent maintenance, high maintenance costs, and low intelligence. These weaknesses will restrict the rapid development of the natural gas industry. [0003] Compared with differential pressure meters, volumetric meters and traditional speed meters, gas ultrasonic flowmeters have the advantages of wide range ratio, intellige...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that in the application environment of the gas ultrasonic flowmeter, the waveform amplitude will change in actual use due to factors such as the aging of the ultrasonic transducer, dirt, and changes in the pressure and temperature of the working condition. Reasonable gain control, the waveform amplitude may exceed the range that the receiving circuit can recognize, resulting in the problem that the flowmeter cannot be used normally. Provide a method that can control the ultrasonic amplitude within a reasonable range to ensure that the flowmeter can measure accurately and last for a long time. Ultrasonic Control Method Combining Amplitude and Pulse Width Modulation for Stable Use

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