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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Universidad de Antioquia
2013
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=43029811002 |
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Sommario:
- Non-linear joint transform correlator for micro-displacement measurement using speckle patterns Luis G. Valdivieso González Jáder E. Guerrero Bermúdez Eduardo Tepichín Rodríguez Ingeniería micro Laser speckle displacements nonlinear joint transform correlator This work presents a procedure for measuring displacements of tens micrometer, in one and two dimensions, based on the correlation between two speckle patterns. For this purpose, two objective speckle patterns are recorded by a digital camera –one before and one after the object has been moved- and placed in the input plane of nonlinear joint transform correlator. Nonlinear transformation of the joint power spectrum allows a sharper correlation peak and a high signal to noise ratio. The autocorrelation peak coordinates of the first pattern are set as a reference for measuring shifts of the successive cross-correlation peak. One criterion for reliable measure is proposed. Results related with different distances sample-sensor and illuminating wavelengths at 632.8 nm and 543.5 nm are presented. 2013 artículo científico 0120-6230 https://www.redalyc.org/articulo.oa?id=43029811002 en http://www.redalyc.org/revista.oa?id=430 Revista Facultad de Ingeniería Universidad de Antioquia application/pdf Universidad de Antioquia Revista Facultad de Ingeniería Universidad de Antioquia (Colombia) Num.68