摘要
提出了一种以基于ARM的超声波检测系统为背景，ARM微处理器S3C2440A为核心控制器，激励脉冲宽度、重复频率和电压幅度可调的超声波发射电路。该电路的高压电源采用一种可控高压电源设计方案，能输出0-1000V电压，重点分析了激励脉冲对超声波信号的影响、电路中各个元件对超声波激励脉冲的影响以及基于ARM的PWM控制脉冲的产生。从理论上得出发射电路中各个电阻与激励脉冲电压电流的数学关系，发射电路可以激励不同探头产生多种频率和发射功率可调的超声波。
In this paper, an ultrasonic transmit circuit controlled by ARM microprocessor S3C2440A is proposed. This circuit is based on an uhrasonic testing system which based on ARM. In this circuit, stimulant pulse width, repeated frequency and the range of voltage are adjustable. The circuit＇s high voltage power supply uses an adjustable high voltage power supply which produces 0-1000V voltage, this paper＇s emphasis is analyzing the ultrasonic signal affected by stimulant pulse, the ultrasonic stimulant pulse affected by every component in the circuit and the source of the PWM controlled pulse based on ARM. The interrelation between resistances of transmitting circuit and the voltage,current of the activation pulse is obtained theoretically, the transmit circuit can excite different probes to produce different ultrasonic, the frequency and the transmit power of the ultrasonic are adjustable.
出处
《电子设计工程》
2010年第7期148-150,共3页
Electronic Design Engineering
关键词
超声波检测
ARM
激励脉冲
发射电路
高压电源
ultrasonic testing
ARM
activation pulse
transmit circuit
high voltage power supply
