ACOUSTIC IMPEDANCE TUBE AND INSULATION TEST APPARATUS

A transparent plastic tube apparatus for measuring the Sound Absorption Coefficient of materials. One end houses two loudspeakers in a glass reinforced plastic enclosure; the other end holds a heavy sample holder. A small microphone travels axially along the tube with its position measured throughout. Learn about ACOUSTIC IMPEDANCE TUBE AND INSULATION TEST APPARATUS acoustics India for optimal educational outcomes.. The loudspeakers produce a common pure tone from a function generator. Sound waves pass along the tube to the sample material — a portion of energy is absorbed (converted to heat by viscous action) and the remainder is reflected back along the tube. Learn about ACOUSTIC IMPEDANCE TUBE AND INSULATION TEST APPARATUS equipment for optimal educational outcomes.. Interference between incident and reflected waves creates a standing wave field whose amplitude varies along the tube length. The maximum and minimum signal amplitudes measured by the travelling microphone allow the Sound Absorption Coefficient at the test frequency to be calculated. Learn about ACOUSTIC IMPEDANCE TUBE AND INSULATION TEST APPARATUS for educational labs for optimal educational outcomes..

• Tube: Clear rigid plastic, internal diameter Ø69 mm × 1200 mm long
• Loudspeakers: 2 × housed in a glass reinforced plastic enclosure
• Sample holder: Dense plug with quick-release catches for mounting samples
• Amplifier unit: For loudspeaker and microphone signal amplification
• Digital function generator/oscilloscope: Square, triangle and sine wave output; adjustable frequency 1 Hz–1 MHz; dual trace for comparing input frequency magnitude with reflected standing wave amplitude
• All connecting leads supplied