HO-ED-A-01A Screen Based Apparatus for Ultrasonic Diffraction Acousto Optic Effect

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: Optical Rail Kinematic Laser Mount Glass tank Mount with Crystal Holder Screen Glass Tank Piezo Electric Crystals RF Oscillator Diode Laser with Power supply (Red) Accessories Test Sample Connecting Cables Instruction Manual