HO-ED-A-01A Screen Based Apparatus for Ultrasonic Diffraction Acousto Optic Effect
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Screen Based Apparatus for Ultrasonic Diffraction
Acousto Optic Effect
The Ultrasonic diffraction apparatus is used to study diffraction of light by ultrasonic waves. Ultrasonic sound refers to sound with a frequency greater than the human audible range (20Hz to 20 KHz). When an ultrasonic wave propagates through a medium, the molecules in that medium vibrate over very short distance in a direction parallel to the longitudinal wave. The apparatus consists of a graduated rail and rail carriages appropriately fitted with a laser head, an RF oscillator, a glass tank mount with crystal holder and a screen.
The ultrasonic waves generated by the transducer travels down the medium (liquid)and gets reflected at the bottom (flat glass plate) of the cell. The incident and reflected waves interfere and a stationary / standing wave pattern is formed. The pattern can be observed on a screen or a wall and we can plot diffraction pattern on a graph paper for further calculations.
Experiment:
To find the velocity of ultrasonic wave in liquids
The velocity of ultrasonic wave in a liquid,
V = ʋ ʌ
Where υ is the frequency of the crystal oscillator and Λ is the wavelength of ultrasonic wave.
We have,
Λ = n λ / Sin θ
Where n is the order of diffraction, λ is the wavelength of the laser used and θ is the angle of diffraction.
θ = tan-1 ( D / L )
D is the order length and L is the distance measured from the crystal oscillator to the detector.
To find the bulk modulus of the given liquid
The bulk modulus of the liquid,
β = ρV2
Where ρ is the density of the liquid and V is the velocity of the ultrasonic wave.
To find the compressibility of the liquid
The compressibility of a liquid is the reciprocal of bulk modulus,
K = 1 / ρV2
Where ρ is the density of the liquid and is V the velocity of the ultrasonic wave.
Specifications:
| 3 MHz crystal | |
| Dimension | 20 mm diameter x 0.7 mm thickness |
| Resonant frequency fr | 3 MHz ± 50 KHz |
| Resonant impedance Zm | ≤ 6 Ω. |
| Static capacitance Cs | 570 0pF ± 15% @ 1 kHz |
| 5 MHz crystal | |
| Dimension | 20 mm diameter x 0.4 mm thickness |
| Resonant frequency fr | 5 MHz ± 100 KHz |
| Resonant impedance Zm | ≤ 0.48 Ω. |
| Static capacitance Cs | 3800 pF ± 20% @ 60 Hz/1 V |
Features:
| Diode laser is used as light source |
| Easy to operate and portable |
| 5 MHz, 3 MHz Piezo electric crystals |
| Corrosion free |
| Precision design |
| Extended durability |
Drawings:
Related Topics:
| Interference |
| Standing waves |
| Huygens' Principle |
| Bulk modulus |
| Compressibility |
Scope of Delivery:
Test Sample
Connecting Cables
Instruction Manual