Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1975-03-24
1977-01-25
Hartary, Joseph W.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
23515135, 346 13, 346 33A, 346 49, 356201, G01D 928
Patent
active
040054349
ABSTRACT:
An improved method for graphically displaying optical density patterns generated by a densitometer which scans a sample to generate analog signals indicative of the optical density of the sample. The maximum amplitude and cumulative amplitude of the analog signals are computed and stored simultaneously as normalizing signals. The sample is again scanned to recreate the analog signals which are directed in two paths toward two graphic display units. The recreated analog signals directed toward the first display unit are modified by the normalizing amplitude signal to create a visual display curve of the normalized density. The recreated analog signals directed toward the second display unit are modified by the normalizing cumulative amplitude signal to create a visual display of the normalized area under the density curve.
The apparatus includes a scanning system having circuitry to provide analog signals indicative of the optical density of the sample and a pair of conventional graphic display devices. The analog signals are generated during a first scan of the sample and the maximum value is measured and stored in a digital-to-analog converter circuit while the cumulative value is simultaneously measured and stored in a voltage controlled digital-to-analog converter circuit. Each stored value is referred to as a normalizing signal. The sample is again scanned to regenerate the analog signals which are fed along two paths, one to drive each display device. The regenerated analog signals are modified along the two paths by each normalizing signal, respectively, and a modified signal drives each display device to provide visual displays of the normalized optical density curve and the normalized area under the optical density curve, respectively.
REFERENCES:
patent: 3706877 (1972-12-01), Clifford et al.
patent: 3750187 (1973-07-01), Keefer
patent: 3842422 (1974-10-01), VandenBroek
patent: 3902813 (1975-09-01), VandenBroek
Butts Gene A.
Golias Tipton L.
Hartary Joseph W.
Helena Laboratories Corporation
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