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Diffraction of ultrasonic waves at a pin hole and a circular obstacle

Product No: P2151715

Principle

A plane ultrasonic wave is subjected to diffraction by a pin-hole obstacle and a complementary circular obstacle. The intensity distribution of the diffracted and interfering partial waves are automatically recorded using a motor-driven, swivel detector and a PC.

Tasks

Determine the angular distribution of an ultrasonic wave diffracted by a pinhole and circular obstacle.
Compare the angular positions of the minimum intensities with the theoretical values.

What you can learn about

Huygens principle
Longitudinal waves
Interference
Fraunhofer and Fresnel diffraction
Fresnel's zone construction
Poisson's spot
Babinet's theorem
Bessel function

Materiallist (Excerpt)	Product	Amount
Goniometer with reflecting mirror	13903-00	1
Goniometer Operation Unit	13903-99	1
Ultrasound operation unit	13900-00	1
Object holder for goniometer	13904-00	1
Ultrasonic transmitter	13901-00	1
Ultrasonic receiver on stem	13902-00	1
Power supply 5 VDC/2.4 A withDC-socket 2.1 mm	13900-99	1
Pin hole & circular obstacle f.ultrasonic	13906-00	1
Software Goniometer	14523-61	1
Screened cable, BNC, l 750 mm	07542-11	1
Data cable, plug/ socket, 9 pole	14602-00	1
Adapter, BNC socket/4 mm plug pair	07542-27	1
Measuring tape, l = 2 m	09936-00	1
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals	16502-42	1