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    • 2. 发明授权
    • Adjustable ultrasonic level measurement device
    • 可调超声波液位测量装置
    • US4221004A
    • 1980-09-02
    • US930667
    • 1978-08-03
    • Charles M. CombsPerry H. Goodwin, Jr.
    • Charles M. CombsPerry H. Goodwin, Jr.
    • G01F23/296G01S15/18G01F15/18
    • G01S15/18G01F23/2962Y10S367/90Y10S367/902Y10S367/908Y10S707/99931
    • An ulrasonic liquid level measurement device is used to measure the depth of a flowing liquid in a channel using an ultrasonic transducer that is positioned out of contact with the liquid and above and directed toward the channel. An ultrasonic burst is directed toward the channel and the reflected echo from the surface of the liquid is returned and sensed by the transducer. The transit time of ultrasonic transmission and echo return is indicative of the liquid level. An adjustable discriminator is provided to specify a maximum liquid level in the channel and a minimum liquid level, which, typically is the floor of the channel. The maximum and minimum levels are adjustable to accomodate variable channel configurations and transducer mounting arrangements. Automatic adjustment is provided to compensate for different cable lengths which may be used to connect the ultrasonic transducer to the transducer driver and receiving section. Temperature compensation is provided to compensate for changes in ultrasonic transmission propogation through ambient air with temperature, and time variable gain amplification is provided to compensate for geometric spreading of reflected ultrasonic energy echo pulses and for air path absorption.
    • 超声波液面测量装置用于使用超声波换能器来测量流道中流动液体的深度,所述超声波换能器定位为不与液体接触并且在上方并指向通道。 超声波爆发指向通道,并且来自液体表面的反射回波被换能器返回并感测。 超声波传播和回波返回的传播时间表示液位。 提供了可调节鉴别器来指定通道中的最大液位和最小液位,其通常是通道的底部。 最大和最小电平可调,以适应可变通道配置和传感器安装布置。 提供自动调整以补偿可用于将超声换能器连接到换能器驱动器和接收部分的不同电缆长度。 提供温度补偿以补偿通过环境空气随温度的超声波传播传播的变化,并且提供时间可变增益放大以补偿反射的超声能量回波脉冲的几何扩展和用于空气路径吸收。