Sipeng Fu, Junjie Li, Feipeng Zhu. Optical Extensometer Based on Telecentric Lens and Biaxial Field-of-View Splitting Technique[J]. Laser & Optoelectronics Progress, 2023, 60(15): 1512003
- Laser & Optoelectronics Progress
- Vol. 60, Issue 15, 1512003 (2023)
Fig. 1. Schematic diagram of the arrangement of four rhombic prisms
Fig. 2. Measurement schematic diagram of proposed optical extensometer. (a) Optical arrangement; (b) a recorded image
Fig. 3. Schematic diagram of gauge-length calibration
Fig. 4. Physical picture of FOV-splitting device. (a) Side view of FOV-splitting device; (b) front view of FOV-splitting device
Fig. 5. Physical picture of calibration piece
Fig. 6. Experimental content. (a) Stainless steel specimen; (b) experimental equipment
Fig. 7. Strain-time curves of different extensometers. (a) Axial strain-time curve; (b) transverse strain-time curve
Fig. 8. Strain error between two optical extensometers and strain gauges. (a) Axial strain error; (b) transverse strain error
Fig. 9. Strain measured by two optical extensometers and strain gauges. (a) Axial strain; (b) transverse strain
Fig. 10. Strain errors of two optical extensometers. (a) Axial strain error;(b) transverse strain error
Fig. 11. Comparison of mechanical parameters measured by different optical extensometers. (a) Elastic modulus; (b) Poisson's ratio
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Table 1. Axial calibration parameters
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Table 2. Root mean square error of biaxial optical extensometer in cyclic loading test
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Table 3. Root mean square error of biaxial optical extensometer in uniaxial tensile tests
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Table 4. Measurement error of elastic modulus and Poisson's ratio
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