Back to results
US 12,078,708 B2Granted
Acoustic horn phased array
OwnerMoshe Benezrainventor
Life of this patent
Estimating the term…
Abstract
A phase array acoustic device using array of horns and optional faceplates is presented. Said horn phased-array acoustic device can be used as a passive sensor, a sound projector, or both (sonar). It is shown that by correct selection of the fill-factor and apodization faceplate, grating-lobes and side-lobes cab be greatly reduced. An optional use of acoustic valves as phase-shifter in the wave domain to improve Signal to Noise Ratio is presented. An optional aperiodic tiling of the horns' mouth to reduces aliasing is presented.
Claims20
A phased array acoustic device comprising:
- a) N≥2 acoustic horns,
- b) M≥1 acoustic transducers,
- c) a digital computer interface,
- d) a digital computer,
- e) an optional K≥0 acoustic faceplates,
- f) an optional L≥0 acoustic phase shifters,
- g) an optional L actuators,
- h) optional R≥0 acoustic mixers;
- wherein:
- the fill-factor of the array, defined as the total area of horns' mouths divided by the area of the array, is greater than 50%;
- AF
-
- (
- θ
- )
- =
- ∑
- n
- =
- 0
- N
- W
- c
-
- ∫
- t
- =
- 0
- t
- max
- sin
- (
- ω
-
- t
- +
- ϕ
- )
-
- δ
-
- t
- AF(θ) is the normalized array factor,
- θ is the angle of arrival relative to the boresight of the array,
- Wc is a weight for each element,
- t is time,
- ω is 2πf,
- f is the frequency,
- ϕ
- =
- 2
-
- π
-
- (
- nd
- +
- r
- n
- )
-
- sin
-
- (
- θ
- -
- θ
- 0
- )
- λ
- λ is the wavelength,
- θ0 is the boresight direction,
- d is displacement of the horns, and
- rn is a perturbation applied to each horn.
71 more elements
A phased array acoustic device comprising:
- a) N≥2 acoustic horns,
- b) M≥1 acoustic transducers,
- c) a digital computer interface,
- d) a digital computer,
- e) an optional K≥0 acoustic faceplates,
- f) an optional L≥0 acoustic phase shifters,
- g) an optional L actuators,
- h) optional R≥0 acoustic mixers;
- wherein:
- the fill-factor of the array, defined as the total area of horns' mouths divided by the area of the array, is greater than 50%;
- and
- weigh the aperture of each element and apply apodization by:
- AF
-
- (
- θ
- )
- =
- ∑
- n
- =
- 0
- N
- ∫
- a
- =
- -
- apr
- +
- apr
- ap
-
- (
- a
- )
-
- ∫
- t
- =
- 0
- t
- max
- sin
- (
- ω
-
- t
- +
- ϕ
- )
-
- δ
-
- t
-
- δ
-
- a
- AF(θ) is the normalized array factor,
- θ is the angle of arrival relative to the boresight of the array,
- t is time,
- ω is 2πf,
- f is the frequency,
- ap(a) is the apodization function of the aperture [−apr . . . apr],
- ϕ
- =
- 2
-
- π
-
- (
- nd
- +
- a
- )
-
- sin
-
- (
- θ
- -
- θ
- 0
- )
- λ
- λ is the wavelength,
- θ0 is the boresight direction, and
- d is displacement of the horns.
85 more elements
Dependencies are inferred from the claim text.