4D profile of phase objects through the use of a simultaneous phase shifting quasi-common path interferometer

Abstract

Modulation of polarization is commonly employed in optical interferometry through the use of polarizers and quarter-wave retarders. Phase shifts between interfering beams can be easily controlled with such techniques. This communication describes some details of modulation of polarization which are useful in phase shifting interferometry applied to the study of phase objects. As an application, the case of a two-beam phase grating interferometer is discussed on the grounds of polarization analysis as an example. The configuration presented does not require micro-polarizer arrays or additional software to eliminate noise caused by vibration. This system does not use a double window, and generates two beams, the separation of which can be varied according to the characteristics of the grid used. Experimental results are also given.

Dynamic temperature field measurements using a polarization phase-shifting technique

“…Temperature profile measurement was obtained analyzing the dynamic behavior at 8.3 fps in a period of time of 12 s. Figure 4 presents the three phase-shifted interferograms obtained by a single capture. After a previous calibration procedure, 1 we are capable of retrieving the three phase-shifted interference patterns. By implementing a fringe normalization technique, we are capable of retrieving the phase data map [see Fig.…”

“…In this study, a measurement system that is capable of grabbing three phase-shifted interferometric images instantaneously (or simultaneously) was developed for dynamic temperature measurement over a period of time. The system presented is based on polarization phase-shifting techniques presented previously, [1][2][3] with the addition of calibration procedures and digital fringe processing techniques in order to accurately measure temperature fields varying in time.…”

Sideband correlation algorithm to detect phase shift and contrast variation in temporal phase-shifting interferometry

“…Many techniques have been developed to handle phase-shift errors in temporal PSI. With the exception of some literatures [3][4][5], a general way is to extract phase shifts of interferograms first and then retrieve the wavefront phase by solving the least-squares equation.…”

Measurement of the dynamic phase profile of transparent fluids

“…The use of phase shifting modulated by polarization has the advantage of not requiring mechanical components, such as a Piezoelectric Transducer (PZT), to obtain the desired phase shifts. A common optical system uses linear polarizing filters and birefringent quarter-wave plates to achieve modulation [9][10][11]; in some situations, exact retardation can not be used, and certain considerations have to be taken into account to extract the correct optical phase data.…”