An optimization method of temperature field distribution to improve the accuracy of laser multi-degree-of-freedom measurement system

Abstract

ObjectiveAiming at the problem that the accuracy and stability of laser multi-degree-of-freedom measurement systems (MDFM) were affected by temperature, an optimization method of temperature field distribution was proposed. MethodsWe analyzed the rotation matrix of optical components and established a measurement error model of misalignment caused by temperature variation. We established the thermal model of the transmitter and optimized the heat dissipation path. The thermal resistance of key components was optimized by computational fluid dynamics (CFD) analysis. ResultsThe simulation results showed that the highest temperatures of the optimized circuit and inner shell were reduced by 8.91 ℃ and 1.20 ℃. The experimental results showed that the temperatures of the optimized circuit and inner shell were reduced by 7.85 ℃ and 0.27 ℃. When the ambient temperature was 20 ℃, the measurement accuracy of pitch angle and vertical straightness were increased by 36.41% and 58.60%. When the ambient temperature was 25 ℃, the measurement accuracy were increased by 16.36% and 36.16%. ConclusionThe optimization method of temperature field distribution can effectively improve the measurement accuracy and stability of the MDFM.