A New Method Based on Position Sensitive Detectors to Measure Spatial Angle of Large-Scale Gyroidal

Abstract:

Technology of spatial angle measurement is widely used in the aviation and national defence. Based on research of the spatial angle measurement, a system to measure the spatial angle is devised in this paper, which uses position sensitive detectors (PSD) as the detector and the laser beam emitted from a semiconductor laser as the straightness reference. The detecting system has some characteristics. A novel method is introduced to correct the spatial angle between the incident beam laser and the photoelectric surface of the PSD, which makes the incident beam laser vertical to the PSD. Besides, a back-propagation (BP) neural network is used in this system to compensate the nonlinearity errors of the 2-D PSD, which can improve the credibility of the detectors output data. It also has advantage of reliable data and high precision to measure the spatial angle of the large-scale gyroidal components. Meanwhile, the measuring principle, optical system and electric circuits of the experimental equipment are analyzed in the paper. The result shows that the experimental equipment is more precise and sensitive than old equipment. The relative error can achieve good accuracy. The detecting system has some theoretical research significance in realizing untouched measurement of large-scale gyroidal components in other similar situation.

• Periodical: Applied Mechanics and Materials (Volumes 457-458)
• Pages: 1352-1356
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.457-458.1352
• Online since: October 2013
• Authors: Zhao Sun, Qing Song, Chang Qing Liu, Han Fei Wu
• Keywords: BP Neural Network (BPNN), Correct, Position Sensitive Detectors, Semiconductor Laser, Spatial Angle Measurement

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