Absolute distance measurement is necessary for many applications where the distance to a fixed-target is required. In this paper, frequency scanning interferometry is implemented with an external cavity tunable diode laser, which has a wavelength scanning range of (665-675 nm), to measure distances up to 5 m absolutely (achieved by multi-reflection system). An ultra-low expansion (ULE) Fabry-Pérot (FP) cavity has been used as a reference to measure the tunable-laser scanning range. Absolute distance is determined by counting the synthetic fringes and FP peaks simultaneously while scanning the laser frequency. A fringe processing technique is developed to perform online distance measurement even though the tunable laser is not mode-hop free. This fringe processing method enables simple, fast and accurate distance measurements with repeatability ±3.9×10-6 L and combined uncertainty ±38.9×10-6 L which is limited by the calibration system used.
Medhat, M., Sobee, M., Hussein, H., & Terra, O. (2015). ABSOLUTE DISTANCE MEASUREMENT USING FREQUENCY SCANNING INTERFEROMETRY. Journal of Scientific Research in Science, 32(part 2), 76-88. doi: 10.21608/jsrs.2015.19947
MLA
M. Medhat; M. Sobee; H. M. Hussein; O. Terra. "ABSOLUTE DISTANCE MEASUREMENT USING FREQUENCY SCANNING INTERFEROMETRY". Journal of Scientific Research in Science, 32, part 2, 2015, 76-88. doi: 10.21608/jsrs.2015.19947
HARVARD
Medhat, M., Sobee, M., Hussein, H., Terra, O. (2015). 'ABSOLUTE DISTANCE MEASUREMENT USING FREQUENCY SCANNING INTERFEROMETRY', Journal of Scientific Research in Science, 32(part 2), pp. 76-88. doi: 10.21608/jsrs.2015.19947
VANCOUVER
Medhat, M., Sobee, M., Hussein, H., Terra, O. ABSOLUTE DISTANCE MEASUREMENT USING FREQUENCY SCANNING INTERFEROMETRY. Journal of Scientific Research in Science, 2015; 32(part 2): 76-88. doi: 10.21608/jsrs.2015.19947
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