home
> products
> BAT's
> BAT
species > BAT-5
BAT-5 dual-element confocal BAT™
Description:
The BAT-5 is a tightly-focussed confocal BAT® transducer containing two independently-operated curved elements. The first is a disk-like element and the second is a surrounding ring-like annulus. Being confocal, the ultrasonic radiation of each non-planar element is focussed to the same point in space (in this case, 70mm along axis). The common focal point is characterized by a diffraction-limited spot size of less than ~600 µm Ø and an effective bandwidth of ~700kHz. One use for MicroAcoustic's BAT-5 transducer is ultrasonic wave mixing at the focus, and this is accomplished by driving the two elements with different drive voltages. Such wave mixing, in turn, can be used to excite low-frequency acoustic vibrations and resonances in solids via difference frequency techniques. Alternatively, the BAT-5 can be used as a dual-element pitch-catch transducer by driving on one of the elements and receiving on the other. The BAT-5 transducer operates equally well in pulse, chirp, toneburst or cw modes of operation.
contact us >> for pricing & availability
Specifications:
- type: dual-element confocal transducer
- active elements: central disk & surrounding annulus
- focal spot sizes: ~600µm Ø, frequency dependent
- focal length: 70mm from elements (30mm from iris diaphragm); frequency independent
- ultrasonic bandwidth in air: 200kHz ~ 900kHz (as measured at the focus)
- housing dimensions: 51mm Ø tapering to 42mm Ø, L 42mm
- electrical connectors: 2 gold MCX on rear of housing
- aperture / cover: adjustable iris diaphragm
- mounting: axial / transverse mounting via 1/4"-20 threaded housing mount
Typical
beam profile:
axial direction =>
The above beam profile was obtained experimentally for a BAT-5 transducer operating as a source under pulsed excitation and with both elements firing. The image was obtained using MicroAcoustic's proprietary miniaturized scanning receivers. The image maps highest received levels to a light green colour and lowest received levels to the muted gold colour of the background. The ultrasonic beam is seen to emerge from the transducer housing at the very left of the image where a last near-field maximum appears shortly thereafter on axis (see left-most green peak). Further out along axis, past the near-field/far-field transition zone, is a more-elongated green peak which marks the position of the primary design focus.
www.microacoustic.com