By James C Wyant; Association for Media-Based Continuing Education for Engineers (U.S.)
Discusses the foundations of optical checking out, uncomplicated interferometric trying out in addition to different kinds of size techniques.
summary: Discusses the rules of optical checking out, uncomplicated interferometric checking out in addition to different varieties of dimension strategies
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Extra resources for Modern optical testing
Schwider-Hariharan algorithm has no error due to 2nd order nonlinearity. Small error due to 3rd order. Error due to Stray Reflections • Stray reflections in laser source interferometers introduce extraneous interference fringes. • Stray reflections add to test beam to give a new beam of some amplitude and phase. • Difference between this resulting phase and phase of test beam gives the phase error. 07 Averaging further reduces error. Reference: Chris Brophy, J. Opt. Soc. Am. A, 7, 537-541 (1990).
7f. Thus, it is possible to produce simple fringe patterns using moiré. These patterns can be photocopied onto transparencies and used as a learning aid to understand interferograms obtained from third-order aberrations. A computer-generated interferogram having 55 waves of tilt across the radius, 6 waves of spherical and -3 waves of defocus is shown in Fig. 7a. 8a shows two identical interferograms superimposed with a small rotation between them. As expected, the moiré pattern consists of nearly straight equi-spaced lines.
The only way to get a moiré pattern by adding two intensity functions is to use a nonlinear detector. 18) This produces terms proportional to the product of the two intensity distributions in the output signal. Hence, a moiré pattern is obtained if the two individual intensity patterns are simultaneously observed by a nonlinear detector (even if they are not multiplied before detection). If the detector produces an output linearly proportional to the incoming intensity distribution, the two intensity patterns must be multiplied to produce the moiré pattern.
Modern optical testing by James C Wyant; Association for Media-Based Continuing Education for Engineers (U.S.)