Large-scale space measurement is of great significance for the assembly of large parts. In view of the problems of traditional measurement methods, such as difficult expansion of the measurement range, complicated calibration process, and poor portability, this work proposes a multicamera vision measurement network that can freely expand the measurement range based on the auto calibration method. First, cameras were fixed to auxiliary targets and every camera with a target was mounted on a precision turntable. Second, the rotation axis parameters of the camera and the target pose relative to the camera coordinate system were estimated. Finally, the extrinsic parameters between the cameras could be estimated by interactive scanning method. The experimental results show that the method in this paper simplifies the calibration method of the multicamera vision measurement network, and the measurement accuracy basically reaches the accuracy of the Zhang type calibration method under the premise that the measurement range can be expanded freely.
Aircraft engine is the core power unit in the aircraft, and monitoring the operational status of aircraft engine can improve the safety and economy of the aircraft. The temperature field of aircraft engine tail spray contains effective information such as the degree of fuel combustion inside the combustion chamber, and monitoring its temperature field can be used to evaluate the state of engine operating. The traditional measurement methods for the temperature field of tail spray generally adopts the measurement method of single point thermometer, Laser Induced Fluorescence (LIF), Tunable Diode Laser Absorption Spectroscopy (TDLAS), etc. However, these methods have limitations such as discrete measurement data, complicated application of equipment, and high price. Therefore, in view of the problems existing in the traditional measurement methods, a schlieren method is proposed in this paper. Firstly, the schlieren system images the temperature field to obtain the correct schlieren image. Then the refractive index distribution of the cross section is obtained according to the schlieren image. Finally, the temperature field distribution is calculated according to the refractive index distribution to measure the temperature field. The schlieren measurement method, a non-contact, highprecision measurement method, which does not require a special laser transceiver device, can be effectively applied to the measurement of the temperature field of the aircraft engine tail spray, providing support for the state monitoring of the aircraft engine.
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