Apparatus for compensating ordinate phase lag in a plotting appa

Details Apparatus for compensating ordinate phase lag in a plotting appa Apparatus for compensating ordinate phase lag in a plotting appa

1976-09-10

1978-12-19

Schaefer, Robert K.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Starting and/or stopping

318621, 318632, 346 33A, H02P 158

Patent

active

041307844

ABSTRACT:
In a plotting apparatus such as a spectrophotometer having a modifying system which introduces a phase lag between the occurrence of a change in a dependent variable quantity and plotting thereof against an independent variable quantity, in one embodiment, a cam is used to provide a quantity representing the dependent phase lag and the output of the cam is coupled to the driving system for the plotter so as to introduce therein a phase shift to compensate for the phase lag. In another, electrical embodiment the same object is accomplished by digitizing the phase lag and using the digital value to offset the wavenumber stepper motor and the chart stepper motor in the spectrophotometer with respect to each other.

REFERENCES:
patent: 3063043 (1962-11-01), Coates
patent: 3976378 (1976-08-01), Pratt
patent: 4000946 (1977-01-01), Way et al.
patent: 4038664 (1977-07-01), Muir

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