Apparatus for measuring the depth, water velocity or water temperature of an open channel

An apparatus for measuring the flow velocity at any point in water by measuring an ultrasonic propagation time transmitted between a plural number of ultrasonic transducers and by a calculation using an ultrasonic velocity, to obtain an accurate average ultrasonic velocity in a vertical direction,

• comprising a fifth transducer which is positioned at the upstream of a slider attached to a support capable of moving up and down, or at the upstream of the bottom of the support for tansmitting and receiving an ultrasonic wave,
• a sixth transducer is positioned at the down stream of the slider or at the down stream of the bottom of the support for transmitting and receiving an ultrasonic wave,
• wherein, a first ultrasonic transducer is fixed to the bottom of the support,
• a second ultrasonic transducer is positioned above the first ultrasonic transducer,
• a third ultrasonic transducer is positioned above the second ultrasonic transducer and below the slider,
• and, a fourth ultrasonic transducer is fixed to the slider,
• each transducer faces with each other.

An apparatus for measuring the flow velocity at any point in water by measuring an ultrasonic propagation time transmitted between a plural number of ultrasonic transducers and by a calculation using an ultrasonic velocity, to obtain an accurate average ultrasonic velocity in a vertical direction,

• comprising a fifth transducer which is fixed to the edge of a level bar, the level bar is fixed either to a slider or the bottom of the support, the slider is attached to the support capable of moving up and down,
• a sixth transducer is fixed to the slider, the bottom of the support or a place nearby the bottom of the support, facing the fifth transducer,
• wherein a first ultrasonic transducer is fixed to the bottom of the support,
• a second ultrasonic transducer is positioned above the first ultrasonic transducer,
• a third ultrasonic transducer is positioned above the second ultrasonic transducer and below the slider,
• and, a fourth ultrasonic transducer is fixed to the slider,
• each transducer faces with each other.