Design and experiment of the noise-resistant and sound focusing accessory of ultrasonic leak detector for spacecraft on orbit

Speaker:
Sun, Wei; Beijing Institute of Spacecraft Environment Engineering; China

Authors:
Sun, W.; Beijing Institute of Spacecraft Environment Engineering; China

ID: ECNDT-0521-2018
Download: PDF
Session: Aerospace 2
Room: G1
Date: 2018-06-12
Time: 14:10 - 14:30

Ultrasonic signal produced by the gas leak is so week that it is difficult to detect, and easily interfered. So developing the noise-resistant and sound focusing accessory for the ultrasonic leak detector is very important for improving ultrasonic leak detector sensitivity and noise-resistant capability. Based on the theory analysis of the leak ultrasonic signal reverberation and anacampsis, the 5A06 aluminium alloy and nylon were selected as the material of noise-resistant and sound focusing accessory by calculation and compare. Then the circular cone trumpet structure was design as the accessory main structure, and the nylon expansion port, nylon shrinking port and aluminium alloy expansion port structures were manufactured. The different structure characters were shown by the contrasting experiment. The results indicate that the nylon expansion circular cone trumpet structure has better sound focusing performance and it can improve the testing sound pressure amplitude 10 times bigger than the detector without the accessory. And the aluminium alloy expansion circular cone trumpet structure has better noise-resistant ability than others. These conclusions are very important for the spacecraft leak detection and it can provide some references for the design of the noise-resistant and sound focusing structure.