초록 ▼

A device and process for measuring tide levels comprising a guide tube having its lower open end immersed below the lowest tide level, a transducer positioned substantially at the upper end of the guide tube for generation and reception of electrical and acoustical signals, a switching circuit for i

A device and process for measuring tide levels comprising a guide tube having its lower open end immersed below the lowest tide level, a transducer positioned substantially at the upper end of the guide tube for generation and reception of electrical and acoustical signals, a switching circuit for isolating the transmitting and receiving signals, and at least one branch tube provided near the upper portion of the guide tube. The length of the branch tube is determined by a formula that takes into account the wavelength and velocity of the sound signals, and the diameter of the guide tube is determined by a formula that takes into account the wavelength of the sound signals.

대표청구항 ▼

1. A device for measuring tide level in sea comprising:a guide tube having its lower open end immersed at least 0.5 m below the lowest tide level to minimize the undesirable effects of the current and surface waves, means for generating, processing and displaying the data signals, a transducer or a

1. A device for measuring tide level in sea comprising:a guide tube having its lower open end immersed at least 0.5 m below the lowest tide level to minimize the undesirable effects of the current and surface waves, means for generating, processing and displaying the data signals, a transducer or a pair of transducers fixed substantially at the upper end of the guide tube for generation and reception of electrical as well as acoustical pulses, a switching circuit for isolating the transmitting and receiving signals, wherein at least one branch tube is provided near the upper end of the guide tube having its length determined by the formula L=(2n-1).lambda./4=(2n-1) C/4f where n=1,2,3 . . . .lambda. is the wavelength of sound (meters); C is the velocity of sound (meters per second); f is the frequency of sound in Hz; and, the diameter of the guide tube is determined by the formula d<.alpha.10.lambda.ord<0.586.lambda. (where .alpha.10=0.586) where .lambda. is the wavelength of sound used, d is the diameter of the tube used for guiding acoustic pulse from the transducer towards the water surface and back.