Illumination control for a densitometer and density measuring de

Details Illumination control for a densitometer and density measuring de Illumination control for a densitometer and density measuring de

1980-09-25

1983-06-28

Arnold, Bruce Y.

Optics: measuring and testing

Of light reflection

315307, 315360, G01N 2101, H05B 3702, H05B 3902

Patent

active

043902804

ABSTRACT:
A measuring instrument, such as a densitometer, that uses an incandescent lamp as a measuring light source is provided with a control stage for energizing the light source upon switch-on to prevent overshoot of the desired luminous flux from the lamp that occurs if the final energizing voltage is applied immediately. The control stage includes an amplifier with a negative feedback network that is fed with a reference voltage via a switch. The feedback network includes a resistance-capacitance element and is responsive to closure of the switch to establish the initial lamp energizing voltage at 1-2% below its final value and to allow the voltage to rise to its final value over a period of 1 to 3 seconds.

REFERENCES:
patent: 3653764 (1972-04-01), Schodl
patent: 3868540 (1975-02-01), Passmore et al.
patent: 4078858 (1978-03-01), Mast
Sanford, J. L., "Voltage Regulator with Precision Current Limiting", IBM Tech. Disclosure Bulletin, vol. 21, No. 11, Apr. 1979.

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