A novel device for measuring velocity of projectile

摘要

A novel device used to measure the velocity of a projectile for the military has been developed. This set of equipment based on the principle of statistics is composed of five groups of sensors. These five groups of sensors are symmetrically arranged to ensure that the groups of sensors measure the same point velocity, and the average value of the groups of sensors is regarded as the final test result. Compared with the traditional test method for projectile velocity, this method reduces the uncertainty of measurement by increasing the measurement samples. In this paper the F-test, T-test and variance are used to prove that the measurement value of this device is an unbiased, consistent and a valid estimation of the true value. Experiments are carried out over a wide operational range from 40m/s to 2000m/s velocity and from 4-mm to 12.7-mm calibre. The results show that the measurement uncertainty of this device is less than 1 parts per thousand (k=2). This device can be suggested as a prior calibration in order to estimate other devices for measuring projectile velocity.