The apparatus consists of a graduated long rail and rail carriages appropriately fitted with laser head and detector translation stage.

The ultrasonic diffraction setup uses laser as light source. As the laser beam is intense and monochromatic, we get clear higher order diffraction pattern. The laser head is mounted by a kinematic holder. This helps to conveniently direct the laser beam through liquid and then to detector. The diffraction pattern is scanned using a detector stage. The detector stage has three dimensional freedom in X,Y and Z axes. X and Y axes have micrometers as actuators for precision measurements. Resolution is 0.01 mm.