HELMHOLTZ RESONATOR SK065
Exp-1 To study acoustic cavity resonators and determine their characteristic frequency.
Exp-2 To study the dependence of characteristic frequency on the volume of cavity of the resonator.
- Easy setup.
- Quick measurement.
- Computer based data collection.
- FFT analysis.
- Cavity resonator.
- Resonance frequency.
- Acoustic resonant circuit.
- Undamped oscillation.
- Fast Fourier transformation.
Principle and Working:
Helmholtz resonator is described by a cavity of air with an opening which resonates at a natural frequency when the air is excited. The relationship of the resonate frequency to the volume of the cavity and size of the port is given by the following equation.
where f is the frequency of resonance, ν the velocity of sound in air, A the cross-sectional area of the port, V0 the static volume of the cavity, and Le the effective length of the port, which is L+1.5r, where L is the actual length and r the port radius (circular port). The resonance frequency varies linearly with the inverse square root of volume which can be investigated in the present setup.
Contents:
| Cat. No. | Item Name | Qty. |
| Data Logging Interface | 1 | |
| Sound sensor | 1 | |
| SC337 | Round bottom flask | 1 |
| SC335 | Round bottom flask | 1 |
| SH310 | Support base | 1 |
| SH323 | Support rod | 1 |
| SW092 | Boss head | 2 |
| SV190 | Three finger clamp | 2 |
| SF667 | Measuring cylinder | 1 |
| R5023 | Vernier Caliper | 1 |
| SP139 | Ruler | 1 |
- Data Logging Interface
- Sound Sensor
- Bosshead SW092
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SPECIFICATIONS Object type : Square & round shape
Object size : Up-to 13mm dia
Material : Aluminium alloy
Object can be held both vertically and horizontally.
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- Three Finger Clamp SV190
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SPECIFICATIONS Material : Aluminium alloy
Tightening screw : 'T' type plastic knob
Rod : Aluminium length=160 mm
Object : Holds up to 75mm diameter.
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- Vernier Caliper R5023
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SPECIFICATIONS Material : Steel
Type : Ground jaws and slides
Internal measurement : 150mm x 0.02mm or 6" x 0.001"
External measurement : 150mm x 0.02mm or 6" x 0.001"
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- Support Base & Support Rod
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SPECIFICATIONSCat No. Dimension Material Base SH310 200x125mm (LxW) Mild steel Rod SH323 750x12.5mm (LxΦ) Mild steel Threading M10
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- Round Bottom Flask
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SPECIFICATIONSCat. No. Volume Mateial SC337 1000ml Glass SC335 250ml Glass
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- Measuring Cylinder SF667
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SPECIFICATIONS Material : Polypropylene & TPX
Capacity : 500ml
Least Count : 5ml
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- Ruler SP139
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SPECIFICATIONS Length : 30cm, 12"
Least Count : 0.5mm
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* Additionally Required
Computer not supplied with this setup.