KEYWORDS: Waveguides, Temperature control, Vacuum, Control systems, Aluminum, Space operations, Design and modelling, Materials properties, Antennas, Temperature metrology
Aiming at the failure problem of the silver plating layer of the waveguide falling off under the action of thermal stress during the vacuum thermal test of the spacecraft, and the problem that the amplitude consistency requirements of the radio frequency channel of the thermal test are not easy to achieve, the temperature control device filled with composite phase change material is proposed to control the temperature of the waveguide during the vacuum thermal test, and the counter-gravity direction and paragravity direction of this scheme and other two schemes (fins and aluminum blocks) of this scheme are simulated by Thermal Desktop software. According to the simulation results, the advantages, disadvantages and scope of application of each scheme are analyzed and summarized. The paragravity phase change device scheme is adopted for temperature control, and the peak temperature of the waveguide is reduced by nearly 20% compared with that without thermal control treatment.
Due to the uncertainties of manual operation, it is difficult to ensure that each joint is available for the welded joint of the thermocouple wire. The size of the thermocouple connector is also small, and it is difficult to distinguish the defect of the connector only by the human eye. This paper proposes a method of computer vision, using the camera to automatically identify defects in the thermocouple connector. Use the Candy edge detection algorithm to find the region of interest, and calculate the parameters such as the diameter of the welding joint through functions such as HoughCircles transform algorithm. Finally, the defects of the welding joint are determined according to such parameters. In this paper, the thermocouple welding joint defect detection algorithm is used to realize the automatic detection of thermocouple welding joint defect. It improves the quality of thermocouple welding joint, and the efficiency of the test personnel is also improved.
In this paper, a dynamic detection system for thermocouple cable insulation defects is proposed. The common thermocouple cable defects are insulation cracking and cable joints. These two defects can be identified by detecting the cable diameter. Detecting such defects through the human eye is time consuming and labor intensive and does not guarantee quality. The method in this paper is to make the thermocouple line pass the field of view of the line camera when moving at high speed. Then use the edge detection algorithm to calculate the cable diameter. After comparing with the standard cable diameter, analyze whether the cable is normal or there is a defect in the joint or the insulation layer. In this paper, the edge detection algorithm is used to realize the dynamic detection of thermocouple cable defects. Improve the reliability of the products, improve the mechanization of the production process, and in a result of labor saving.
With the rapid development of China's space industry, digitization and intelligent is the tendency of the future. This report is present a foundation research about guidance system which based on the HSV color space. With the help of these research which will help to design the automatic navigation and parking system for the frock transport car and the infrared lamp homogeneity intelligent test equipment.
The drive mode, steer mode as well as the navigation method was selected. In consideration of the practicability, it was determined to use the front-wheel-steering chassis. The steering mechanism was controlled by the stepping motors, and it is guided by Machine Vision. The optimization and calibration of the steering mechanism was made. A mathematical model was built and the objective functions was constructed for the steering mechanism.
The extraction method of the steering line was studied and the motion controller was designed and optimized. The theory of HSV, RGB color space and analysis of the testing result will be discussed
Using the function library OPENCV on the Linux system to fulfill the camera calibration. Based on the HSV color space to design the guidance algorithm.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.