title: Simultaneous phase-shifting dual-wavelength interferometry based on two-step demodulation algorithm.
abstract: A simultaneous phase-shifting dual-wavelength interferometry based on two-step demodulation algorithm is proposed in this Letter. First, two lasers with different wavelengths go through the same inline phase-shifting interference system simultaneously, and a sequence of five frames of simultaneous phase-shifting dual-wavelength interferograms (SPSDWIs) with the special phase shifts are captured by a monochrome CCD. Subsequently, using the subtraction between the first SPSDWI and the other SPSDWI, each wavelength of two frames of single-wavelength interference images (SWIIs) without the background can be achieved. Finally, using two-step demodulation algorithm, the wrapped phase of each single-wavelength can be determined easily and quickly with high accuracy.
authors.forename: Wangping
authors.initials: W
authors.lastname: Zhang
authors.forename: Xiaoxu
authors.initials: X
authors.lastname: Lu
authors.forename: Leihuan
authors.initials: L
authors.lastname: Fei
authors.forename: Hui
authors.initials: H
authors.lastname: Zhao
authors.forename: Hanling
authors.initials: H
authors.lastname: Wang
authors.forename: Liyun
authors.initials: L
authors.lastname: Zhong