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US 5,203,823 AGranted
Detecting apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsShusou Wadaka, Koichiro Misu, Tsutomu Nagatsuka, Mitsuhiro Koike
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Abstract
An ultrasonic non-destructive inspecting apparatus is constructed to comprise a transmission signal generator, an ultrasonic probe, a correlator and an adder wherein a transmission signal based on a sequence is generated and transmitted to a specimen, its echo is correlation processed with an appropriate reference signal, and the results of the correlation processes are summed to judge a reflection matter within the specimen.
Claims47
A detecting apparatus characterized by comprising:
- a first transmission signal generating means for generating a first transmission signal which has a wave form comprising smoothly curved portions;
- a second transmission signal generating means for generating a second transmission signal which has a wave form comprising smoothly curved portions;
- a first transmitting means for transmitting waves to an object by said first transmission signal;
- a second transmitting means for transmitting waves to said object by said second transmission signal;
- a first receiving means for receiving a first echo corresponding to said first transmission signal;
- a second receiving means for receiving a second echo corresponding to said second transmission signal;
- a first correlation operation means for performing a first correlation operation with respect to said first echo;
- a second correlation operation means for performing a second correlation operation with respect to said second echo;
- and
- a processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained.
7 more elements
A detecting apparatus, comprising:
- transmission signal generating means for generating a first transmission signal which has a waveform comprising smoothly curved portions and a second transmission signal which has a waveform comprising smoothly curved portions;
- transmitting and receiving means for transmitting waves to an object respectively by said first and second transmission signals and for receiving first and second echoes from the object respectively corresponding to said first and second transmission signals;
- correlation operation means for performing a first correlation operation with respect to said first echo and a second correlation operation with respect to said second echo;
- and
- processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained,
- wherein said first and said second transmission signal are alternately generated in timing.
3 more elements
A detecting apparatus, comprising:
- transmission signal generating means for generating a first transmission signal which has a waveform comprising smoothly curved portions and a second transmission signal which has a waveform comprising smoothly curved portions;
- transmitting and receiving means for transmitting waves to an object respectively by said first and second transmission signals and for receiving first and second echoes from the object respectively corresponding to said first and second transmission signals;
- correlation operation means for performing a first correlation operation with respect to said first echo and a second correlation operation with respect to said second echo;
- and
- processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained,
- wherein said first correlation operation is performed between said first echo and a first reference signal, and said second correlation operation is performed between said second echo and a second reference signal,
- and wherein said first reference signal is a first echo related to said first transmission signal from the surface or the bottom of said object, and said second reference signal is a second echo related to said second transmission signal from the surface or the bottom of said object.
4 more elements
A detecting apparatus, comprising:
- transmission signal generating means for generating a first transmission signal which has a waveform comprising smoothly curved portions and a second transmission signal which has a waveform comprising smoothly curved portions;
- transmitting and receiving means for transmitting waves to an object respectively by said first and second transmission signals and for receiving first and second echoes from the object respectively corresponding to said first and second transmission signals;
- correlation operation means for performing a first correlation operation with respect to said first echo and a second correlation operation with respect to said second echo;
- and
- processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained,
- wherein said first correlation operation is performed between said first echo and a first reference signal, and said second correlation operation is performed between said second echo and a second reference signal,
- and wherein said first reference signal is one computed based on frequency response characteristics of a signal path from an output portion of said transmission signal generating means through said object to an input portion of said correlation operation means and said first transmission signal, and said second reference signal is one computed based on frequency response characteristics of a signal path from an output portion of said transmission signal generating means through said object to an input portion of said correlation operation means and said second transmission signal.
4 more elements
A detecting apparatus, comprising:
- transmission signal generating means for generating a first transmission signal which has a waveform comprising smoothly curved portions and a second transmission signal which has a waveform comprising smoothly curved portions;
- transmitting and receiving means for transmitting waves to an object respectively by said first and second transmission signals and for receiving first and second echoes from the object respectively corresponding to said first and second transmission signals;
- correlation operation means for performing a first correlation operation with respect to said first echo and a second correlation operation with respect to said second echo;
- and
- processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained,
- wherein said first correlation operation is performed between said first echo and a first reference signal, and said second correlation operation is performed between said second echo and a second reference signal,
- and wherein said first reference signal is an echo from a portion of a trial object when waves are transmitted to said trial object from said transmitting and receiving means by said first transmission signal, and said second reference signal is an echo from said portion of said trial object when waves are transmitted to said trial object from said transmitting and receiving means by said second transmission signal.
4 more elements
A detecting apparatus, comprising:
- transmission signal generating means for generating a first transmission signal which has a waveform comprising smoothly curved portions and a second transmission signal which has a waveform comprising smoothly curved portions;
- transmitting and receiving means for transmitting waves to an object respectively by said first and second transmission signals and for receiving first and second echoes from the object respectively corresponding to said first and second transmission signals;
- correlation operation means for performing a first correlation operation with respect to said first echo and a second correlation operation with respect to said second echo;
- and
- processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained,
- wherein said first correlation operation is performed between said first echo and a first reference signal, and said second correlation operation is performed between said second echo and a second reference signal,
- and wherein said first reference signal is a signal which has the wave form similar to that of said first echo, and said second reference signal is a signal which has the wave form similar to that of said second echo.
4 more elements
A detecting apparatus comprising:
- a single generator for generating a first transmission signal which has a wave form comprising smoothly curved portions, and for generating a second transmission signal which has a wave form comprising smoothly curved portions;
- a first transmitting means for transmitting waves to an object by said first transmission signal;
- a second transmitting means for transmitting waves to said object by said second transmission signal;
- a first receiving means for receiving a first echo corresponding to said first transmission signal;
- a second receiving means for receiving a second echo corresponding to said second transmission signal;
- a first correlation operation means for performing a first correlation operation with respect to said first echo;
- a second correlation operation means for performing a second correlation operation with respect to said second echo;
- and
- a processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained.
6 more elements
A detecting apparatus comprising:
- a first transmission signal generating means for generating a first transmission signal which has a wave form comprising smoothly curved portions;
- a second transmission signal generating means for generating a second transmission signal which has a wave form comprising smoothly curved portions;
- a single transmitter for transmitting waves to an object by said first transmission signal and for transmitting waves to said object by said second transmission signal;
- a first receiving means for receiving a first echo corresponding to said first transmission signal;
- a second receiving means for receiving a second echo corresponding to said second transmission signal;
- a first correlation operation means for performing a first correlation operation with respect to said first echo;
- a second correlation operation means for performing a second correlation operation with respect to said second echo;
- and
- a processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained.
6 more elements
A detecting apparatus comprising:
- a first transmission signal generating means for generating a first transmission signal which has a wave form comprising smoothly curved portions;
- a second transmission signal generating means for generating a second transmission signal which has a wave form comprising smoothly curved portions;
- a first transmitting means for transmitting waves to an object by said first transmission signal;
- a second transmitting means for transmitting waves to said object by said second transmission signal;
- a single receiver for receiving a first echo corresponding to said first transmission signal and for receiving a second echo corresponding to said second transmission signal;
- a first correlation operation means for performing a first correlation operation with respect to said first echo;
- a second correlation operation means for performing a second correlation operation with respect to said second echo;
- and
- a processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained.
6 more elements
A detecting apparatus comprising:
- a first transmission signal generating means for generating a first transmission signal which has a wave form comprising smoothly curved portions;
- a second transmission signal generating means for generating a second transmission signal which has a wave form comprising smoothly curved portions;
- a first transmitting means for transmitting waves to an object by said first transmission signal;
- a second transmitting means for transmitting waves to said object by said second transmission signal;
- a first receiving means for receiving a first echo corresponding to said first transmission signal;
- a second receiving means for receiving a second echo corresponding to said second transmission signal;
- a single correlator for performing a first correlation operation with respect to said first echo and for performing a second correlation operation with respect to said second echo;
- and
- a processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained.
6 more elements
A detecting apparatus comprising:
- a first transmission signal generating means for generating a first transmission signal which has a wave form comprising smoothly curved portions;
- a second transmission signal generating means for generating a second transmission signal which has a wave form comprising smoothly curved portions;
- a single common transmitting/receiving means for transmitting waves to an object by said first transmission signal, for transmitting waves to said object by said second transmission signal, for receiving a first echo corresponding to said first transmission signal, and for receiving a second echo corresponding to said second transmission signal;
- a first correlation operation means for performing a first correlation operation with respect to said first echo;
- a second correlation operation means for performing a second correlation operation with respect to said second echo;
- and
- a processing means for processing results of said first and second correlation operations, whereby a signal which has substantially zero range sidelobes is obtained.
4 more elements
Dependencies are inferred from the claim text.