Analysis of Lau interferometric fringe for measurement of focal length by using wavelet filtering techniques |
| |
Authors: | Sumitra Singh |
| |
Institution: | Optoelectronics Devices Group, CSIR – Central Electronics Engineering Research Institute (CSIR-CEERI), Pilani 333031, India |
| |
Abstract: | New filtering scheme is investigated and implemented on Lau interferometric fringes to enhance the signal-to-noise ratio (SNR) in the Lau interferograms. Towards this, the applicability of Haar, Daubechies and Symlet wavelet based filtering schemes have been tested. Of these schemes, the Symlet based filtering scheme gives the best results in terms of improved signal to noise ratio and speckle index. This scheme is then used to analyse Lau interferograms recorded in the experimental arrangement for focal length measurement. The processed interferograms yield improved accuracy and precision of measurement. |
| |
Keywords: | Focal length Lau interferometry Symlet wavelet Fringe analysis |
本文献已被 ScienceDirect 等数据库收录! |