shorten.the exposure time. An independent test verified that a

shorter exposure on several points gave results consistent with the

120 second measurement. This indicates that the 120 second exposure

did not cause significant reciprocity failure. The film processing

procedure is outlined briefly in the printout with developing times

and temperatures recorded. The data from the measurement of the film

includes the step number, the exposure through that step, the density

on the developed film, and the associated amplitude transmission.

 The computer tabulates several useful points from the data. The

exposure and transmission at the point of inflection are provided.

The best linear fit is determined by the slope and intercept of a line

tangent to the curve through the inflection point. Also, since most

phase holograms are exposed to OD 2.0, the appropriate exposure value

is provided. Finally, the printout provides the polynomial

coefficients for the transmission vs. exposure curve and its inverse

relationship along with the coefficient of correlation. The H & D

plot is found in Figure 6.3 for the AGFA 10E75 plates. The associated

transmission vs. exposure is plotted in Figure 6.4. The plot shows

the linear fit through the inflection point and the result of the 5th

order polynomial. Figures 6.5 through 6.7 are identical to Figures

6.2 through 6.4 except the results are for AGFA 8E75 plates.

 Computer Linearization of Filter Response

 The models presented here include a summation of terms

 representing various powers or orders. The linear term or first order

 represents the desired term where the transmission is linear with

 exposure. If the linear term represents the signal and the higher

 order terms represent noise, then the recording on the film is