Research on Attenuation Motion Test Based on Double-N Six-Light-Screen System

Abstract

In this paper, to improve the testing accuracy of moving objects, the speed attenuation caused by air resistance was introduced into a double-N six-light-screen test system, and the pulse-time axis was recalibrated. Through error analyses of the yaw angle, pitch angle, and axial speed and distance, the advantages of this improved system for testing accuracy were demonstrated. In addition, the reliability of this system was verified through an experimental test with mud pellets. The results show that this system greatly improved the test accuracy of yaw angle and pitch angle, using certain statistical rules for test errors, and the error of the axial speed was only affected by pitch coordinates, while the distance error could reach the nanometer scale, which satisfies our test requirements for small-volume moving objects.

Calibration method for the measurement accuracy of a photoelectric test system with intersecting detection areas using array optical signal

“…Step 1: A set of known measurement results of [xi*, yi*, zi*, vi*, θi*, γi*] T is optionally specified as long as they satisfy the requirements of (10). Then, these data are mapped to a set of time series of [t0 t1, t2 ... t5] T by (13).…”

“…To measure the above key firepower parameters, there is currently a mainstream instrument called photoelectric test system with intersecting detection areas (also called multi-light screen measurement system). Compared with other approaches, such as high-speed photography [4], photoelectricity [5], acoustic [6], radar [7], double-CCD intersection [8,9] this instrument has many advantages of high detection sensitivity, high measurement accuracy, larger velocity measurement range, low maintenance cost, easy operation, and high reliability [10]. According to the metrological legislation in each country, the measurement accuracy of each instrument should be calibrated before use.…”

Accuracy calibration of the multi-light screen measurement system using array optical signal

“…In fact, equation ( 10) is a system of linear equations in six unknowns (i.e., t 0 t 1 , t 2 … t 5 ). Solving (10) can give us these six unknowns, which is also the desired time sequence, can be obtained. In general, we use symbolic operation in Python or other similar software to derive their expression easily.…”

“…T is optionally specified as long as they satisfy the requirements of (10). Then, these data are mapped to a set of time sequence of [t 0 t 1 , t 2 … t 5 ] T by (13).…”

“…Currently, there is a mainstream instrument called multi-light screen array measurement system (or photoelectric testing system with intersecting detection areas) in the field. In comparison with other approaches, such as high-speed camera [3,4], photoelectricity [5], acoustic [6], radar [7], double-CCD intersection [8,9] this instrument has many advantages of high detection sensitivity, high measurement accuracy, larger velocity measurement range, low maintenance cost, easy operation, and high reliability [10]. Besides, this instrument is used in other fields.…”