Abstract

An inverse densitometric circuit is described which employs the technique of voltage-transfer curve translation to provide a direct linear measure to photographic-energy profiles. An antilog <i>D</i> scale (reciprocal-transmittance scale) linear to ±0.05 antilog <i>D</i> units over a basic antilog <i>D</i> range of 12 is obtained. Neutral-density filters are used to compound the basic sensitivity increment and obtain a total light-level range in excess of 1 to 10<sup>3</sup>. An optical system is described which provides an instrument resolving power of 500 lines/mm.

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References

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  1. P. Hariharan and M. S. Bhalla, Rev. Sci. Instr. 27, 3 (1956).
  2. R. W. Engstrom, J. Opt. Soc. Am. 37, 420 (1947).
  3. M. Banning, J. Opt. Soc. Am. 37, 686 (1947).
  4. K. Frei and Hs. H. Gunthard, J. Opt. Soc, Am. 51, 83 (1961).

Banning, M.

M. Banning, J. Opt. Soc. Am. 37, 686 (1947).

Bhalla, M. S.

P. Hariharan and M. S. Bhalla, Rev. Sci. Instr. 27, 3 (1956).

Engstrom, R. W.

R. W. Engstrom, J. Opt. Soc. Am. 37, 420 (1947).

Frei, K.

K. Frei and Hs. H. Gunthard, J. Opt. Soc, Am. 51, 83 (1961).

Gunthard, Hs. H.

K. Frei and Hs. H. Gunthard, J. Opt. Soc, Am. 51, 83 (1961).

Hariharan, P.

P. Hariharan and M. S. Bhalla, Rev. Sci. Instr. 27, 3 (1956).

Other

P. Hariharan and M. S. Bhalla, Rev. Sci. Instr. 27, 3 (1956).

R. W. Engstrom, J. Opt. Soc. Am. 37, 420 (1947).

M. Banning, J. Opt. Soc. Am. 37, 686 (1947).

K. Frei and Hs. H. Gunthard, J. Opt. Soc, Am. 51, 83 (1961).

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