Modern optical testing by James C Wyant; Association for Media-Based Continuing

By James C Wyant; Association for Media-Based Continuing Education for Engineers (U.S.)

Discusses the rules of optical checking out, uncomplicated interferometric checking out in addition to different varieties of dimension techniques.

summary: Discusses the rules of optical checking out, uncomplicated interferometric checking out in addition to different different types of dimension recommendations

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A) Vertical displacement. (b) Vertical displacement with rotation showing tilt. (c) Horizontal displacement. (d) Horizontal displacement with rotation showing tilt. (1970), and Wasowski (1970). Moiré has also been used to compare an object to a master and for vibration analysis (Der Hovanesian and Yung 1971; Gasvik 1987). A theoretical review and experimental comparison of moiré and projection techniques for contouring is given by Benoit et al. (1975). Automatic computer fringe analysis of moiré patterns by finding fringe centers were reported by Yatagai et al.

6d, the two in interferograms are rotated slightly with respect to each other so that the tilt will not quite cancel. 3. 6. Moiré between two interferograms. (a) Interferogram having 50 waves tilt. (6) Interferogram having 50 waves tilt plus 4 waves of defocus. (c) Superposition of (a) and (b) with no tilt between patterns. (d) Slight tilt between patterns. 17) If α = 0, the tilt cancels completely and four waves of defocus remain; otherwise, some tilt remains in the moiré pattern. 7 shows similar results for interferograms containing third-order aberrations.

17) If α = 0, the tilt cancels completely and four waves of defocus remain; otherwise, some tilt remains in the moiré pattern. 7 shows similar results for interferograms containing third-order aberrations. Spherical aberration with defocus and tilt is shown in Fig. 7d. One interferogram has 50 waves of tilt (Fig. 6a), and the other has 55 waves tilt, 6 waves third-order spherical aberration, and -3 waves defocus (Fig. 7a). 7e shows the moiré between an interferogram having 50 waves of tilt (Fig.

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