CONTEMPORANEOUS FIRING SCHEME FOR ACOUSTIC INSPECTION
Acoustic evaluation of a target can be performed using an array of electro-acoustic transducers. For example, a technique for such evaluation can include generating pulses for transmission by respective ones of a plurality of electro-acoustic transducers in a transducer array to contemporaneously establish respective acoustic beams corresponding to at least two different acoustic beam steering directions for an acquisition, the pulses comprising at least a first sequence having pulses of defining a profile having a first polarity, the first sequence corresponding to a first beam steering direction (e.g., angle or spatial beam direction), and a second sequence having pulses defining a profile having a second polarity opposite the first polarity, the second sequence corresponding to a second beam steering direction. In response to transmission of the pulses, respective acoustic echo signals can be received and aggregated to form an image of a region of interest on or within the target.
1 . A method for acoustic evaluation of a target using an array of electro-acoustic transducers, the method comprising:
generating pulses for transmission by respective ones of a plurality of electro-acoustic transducers in a transducer array to contemporaneously establish respective acoustic beams corresponding to at least two different acoustic beam steering directions for an acquisition, the pulses comprising at least a first sequence having pulses of defining a profile having a first polarity, the first sequence corresponding to a first beam steering direction, and a second sequence having pulses defining a profile having a second polarity opposite the first polarity, the second sequence corresponding to a second beam steering direction; and
in response to transmission of the pulses, receiving respective acoustic echo signals and aggregating the received acoustic echo signals to form an image of a region of interest on or within the target.
2 . The method of claim 1 , wherein generating the pulses includes generating respective sequences for different ones of the plurality of electro-acoustic transducers including suppressing generation of pulses for a central element or aperture defined by the transducer array.
3 . The method of claim 1 , wherein the first sequence and the second sequence define respective pulse sequences for different ones of the plurality of electro-acoustic transducers, the respective pulse sequences comprising a sum of contributions from the first sequence and the second sequence corresponding to a respective one of the plurality of electro-acoustic transducers.
4 . The method of claim 1 , wherein the array comprises a one-dimensional array.
5 . The method of claim 4 , wherein the array comprises a linear array.
6 . The method of claim 4 , wherein an amplitude of a pulse within each respective pulse sequence is at most a single unit-amplitude.
7 . The method of claim 1 , wherein the array comprises a two-dimensional array.
8 . The method of claim 7 , wherein generating pulses for transmission by respective ones of the plurality of electro-acoustic transducers in the two-dimensional array comprises contemporaneously establishing respective acoustic beams corresponding to multiple acoustic beam directions for the acquisition, the acoustic beams extending at least in part radially in a semi-circular or circular arrangement about a central axis of the two-dimensional array.
9 . The method of claim 8 , wherein the first and second sequences correspond to adjacent acoustic beams in the semi-circular or circular arrangement about the central axis of the two-dimensional array.
10 . The method of claim 1 , wherein any amplitude of a pulse within each respective pulse sequence comprises a half unit-amplitude, a whole unit-amplitude, or zero amplitude.
11 . The method of claim 1 , wherein amplitudes of respective pulses within each respective pulse sequence are established using a count of levels that are fewer than a count of pulses in the sequence.
12 . The method of claim 1 , wherein generating the pulses for transmission includes suppressing formation of a sidelobe or beam in a direction normal to a surface of the target.
13 . The method of claim 1 , wherein the first sequence and the second sequence are included as a first transmit set defining first beam group corresponding to a first acquisition; and wherein the method comprises generating respective sequences comprising a second transmit set defining a different second beam group corresponding to a second acquisition.
14 . The method of claim 13 , wherein the second beam group defines beam directions located in gaps between respective beam directions of the first beam group.
15 . An ultrasonic inspection system for acoustic evaluation of a target, the system comprising:
an analog front end comprising transmit and receive circuitry coupled to a plurality of electro-acoustic transducer elements;
a processor circuit communicatively coupled with the analog front end; and
a memory circuit comprising instructions that, when executed by the processor circuit, cause the system to:
generate pulses for transmission by respective ones of the plurality of electro-acoustic transducers in a transducer array to contemporaneously establish respective acoustic beams corresponding to at least two different acoustic beam steering directions for an acquisition, the pulses comprising at least a first sequence having pulses of defining a profile having a first polarity, the first sequence corresponding to a first beam steering direction, and a second sequence having pulses defining a profile having a second polarity opposite the first polarity, the second sequence corresponding to a second beam steering direction; and
in response to transmission of the pulses, receive respective acoustic echo signals and aggregating the received acoustic echo signals to form an image of a region of interest on or within the target.
16 . The ultrasonic inspection system of claim 15 , wherein the first sequence and the second sequence define respective pulse sequences for different ones of the plurality of electro-acoustic transducers, the respective pulse sequences comprising a sum of contributions from the first sequence and the second sequence corresponding to a respective one of the plurality of electro-acoustic transducers.
17 . The ultrasonic inspection system of claim 15 , wherein the plurality of electro-acoustic transducers comprises a one-dimensional array.
18 . The ultrasonic inspection system of claim 17 , wherein an amplitude of a pulse within each respective pulse sequence is at most a single unit-amplitude.
19 . The ultrasonic inspection system of claim 15 , wherein the plurality of electro-acoustic transducers comprises a two-dimensional array.
20 . The ultrasonic inspection system of claim 19 , wherein the instructions to generate pulses for transmission by respective ones of the plurality of electro-acoustic transducers in the two-dimensional array comprise instructions to contemporaneously establishing respective acoustic beams corresponding to multiple acoustic beam directions for the acquisition, the acoustic beams extending at least in part radially in a semi-circular or circular arrangement about a central axis of the two-dimensional array.
21 . The ultrasonic inspection system of claim 20 , wherein the first and second sequences correspond to adjacent acoustic beams in the semi-circular or circular arrangement about the central axis of the two-dimensional array.
22 . The ultrasonic inspection system of claim 15 , wherein any amplitude of a pulse within each respective pulse sequence comprises a half unit-amplitude, a whole unit-amplitude, or zero amplitude.
23 . The ultrasonic inspection system of claim 15 , wherein amplitudes of respective pulses within each respective pulse sequence are established using a count of levels that are fewer than a count of pulses in the sequence.
24 . The ultrasonic inspection system of claim 15 , wherein the instructions to generate the pulses for transmission include instructions to suppress formation of a sidelobe or beam in a direction normal to a surface of the target.
25 . The ultrasonic inspection system of claim 15 , wherein the first sequence and the second sequence are included in a first transmit set defining first beam group corresponding to a first acquisition; and wherein the instructions comprise instructions to generate respective sequences comprising a second transmit set defining a different second beam group corresponding to a second acquisition.
26 . The ultrasonic inspection system of claim 25 , wherein the second beam group defines beam directions located in gaps between respective beam directions of the first beam group.
27 . An ultrasonic inspection system for acoustic evaluation of a target, the system comprising:
a means for generating pulses for transmission by respective ones of a plurality of electro-acoustic transducers in a transducer array to contemporaneously establish respective acoustic beams corresponding to at least two different acoustic beam steering directions for an acquisition, the pulses comprising at least a first sequence having pulses of defining a profile having a first polarity, the first sequence corresponding to a first beam steering direction, and a second sequence having pulses defining a profile having a second polarity opposite the first polarity, the second sequence corresponding to a second beam steering direction; and
a means for receiving respective acoustic echo signals in response to transmission of the pulses; and
a means for aggregating the received acoustic echo signals to form an image of a region of interest on or within the target.