International Journal of Electronic Engineering Research ISSN 0975- 6450 Volume 1 Number 2 (2009) pp. 101–108 © Research India Publications http://www.ripublication.com/ijeer.htm Study of Different Measurement Systems and Design of Circuitry with Intensity Modulated measuring the Velocity of Projectile 1 Amandeep Kaur, 2 Renu Vig and 3 Randhir Bhatnagar 1 Student ME (ECE), UIET (Punjab University, Chandigarh,India) E-mail: Amanu_kang@yahoo.co.in 2 Professor UIET (ECE), Punjab University Chandigarh E-mail: renuvig@hotmail.com 3 Scientist “F”, CSIO Chandigarh E-mail: Rbh5@rediffmail.com Abstract The aircraft structures are affected by the high velocity objects. The impact force of high velocity projectile can fracture the body if the collision does not have sufficient time for deformation to occur. The velocity of the object can vary in the range from subsonic to supersonic. The objects moving with high velocity have the high pressure waves which can damage the aircraft after striking. By calculating the velocity of an object the material of aircraft structure can be made more reliable and effective so that it can absorb these pressure waves. Different measurement systems are used and in every system the triggering time is calculated when object passes through the system. The distance is fixed and time is determined so from these two variables, velocity can be calculated. In the design circuitry the Laser Beam is converted into Pulses by Intensity Modulated Scheme to overcome the problem of setting the threshold value which varies with the intensity of light variation in the day while testing. In the design circuitry the distance is kept fixed i.e. 5 cm and the object taken to interrupt is piece of black paper in cylindrical shape when it is passed between two channels gives two pulses. The pulses with duration of 7.5 ms are determined. The velocity 6.6 m/sec is calculated with this concept. Proper setup using this design will calculate the highest velocity with more accuracy. Keywords: velocity measurement system, Optoelectronic, Aircraft Protection.