Feipeng Zhu, Jian Gu, Runzhi Lu, Jin Tao, Pengxiang Bai, Dong Lei. Improvement and Realization of Field-of-View Splitting Optical Extensometer[J]. Laser & Optoelectronics Progress, 2021, 58(23): 2312002
- Laser & Optoelectronics Progress
- Vol. 58, Issue 23, 2312002 (2021)
Fig. 1. Measurement principle. (a) Construction of optical extensometer; (b) schematic diagram of rhombic
Fig. 2. Calibration of gauge length
Fig. 3. Specimen and lens. (a) Stainless steel tensile specimen; (b) 0.5X telecentric lens
Fig. 4. Improved FOV splitting device diagram. (a) Side view; (b) front view; (c) inner view
Fig. 5. Experimental setup
Fig. 6. Strain results of specimen. (a) Axial strain of the proposed extensometer in the first test; (b) RMSE of strain errors in the eight tests
Fig. 7. Measured strain-time curve. (a) Conventional optical extensometer; (b) improved optical extensometer
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Table 1. Strain error statistics of proposed extensometer in eight repeated tests
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